I 2 C BUS 2kbit + 2kbit 2ports serial EEPROM

Transcription

1 I 2 BU 2kbit + 2kbit 2ports serial EEOM BU9922NUX-3 Description BU9922NUX-3 series is 2kbit + 2kbit 2ports serial EEOM of I 2 BU interface method. FEUE 2kbit + 2kbit 2ports serial EEOM Other devices than EEOM can be connected to the same port, saving microcontroller port.7v~5.5v single power source action most suitable for battery use.7v~5.5vwide limit of action voltage, possible F MODE 4Hz action age write mode useful for initial value write at factory shipment uto erase and auto end function at data write Low current consumption Write mistake prevention function Write (write protect) function added (only port2 EEOM) Write mistake prevention function at low voltage VON8X23 small package Data rewrite up to,, times Data kept for 4 years Noise filter built in L / D terminal hipment data all address FFh 2 OHM o., Ltd. ll rights reserved. Z22 4 /23 Z22-2G ev.

2 BU9922NUX-3 bsolute maximum rating (a=25 ) arameter symbol Limits Unit Impressed voltage V -.3~+6.5 V ermissible dissipation d 3 * mw torage temperature range stg -65~+5 ction temperature range opr -4~+85 erminal voltage -.3~Vcc+. *2 V Junction emperature *3 jmax 5 * When using at a=25 or higher, 3.mW to be reduced per. *2 he Max value of erminal Voltage is not over 6.5V. When the pulse width is 5ns or less, the Min value of erminal Voltage is not under -.8V. *3 Junction temperature at the storage condition. Memory cell characteristics (a=25, Vcc=.7~5.5V) arameter Limits Unit Min. yp. Max Write/Erase cycle *,, - - cycles Data retention * Years * Not % EED ecommended operating condition arameter ymbol Limits Unit ower source voltage Vcc.7~5.5 V Input voltage V IN ~Vcc D operating characteristics (Unless otherwise specified, a=-4~+85 V=.7~5.5V) pecification arameter ymbol Min. yp. Max. Unit est ondition H input voltage L input voltage V IH.7Vcc - Vcc+. V V IL -.3 * -.3Vcc V L output voltage L output voltage2 V OL V V OL V I OL =3.m, 2.5V Vcc 5.5V (D,D2) I OL =.7m,.7V Vcc<2.5V (D,D2) Input leak current Output leak current I LI - - μ V IN =~Vcc I LO - - μ V OU =~Vcc (D,D2) I w m Vcc=5.5V,f L =4kHz, t W =5ms, Bytewrite agewrite Operating urrent I w I r I r m Vcc2=5.5V,f L =4kHz, t W =5ms, Bytewrite agewrite Vcc=5.5V,f L =4kHz andom read, current read, sequential read Vcc2=5.5V,f L =4kHz andom read, current read, sequential read tandby current I B Vcc=5.5V, D L=Vcc μ Vcc2=5.5V, D2 L2=Vcc I B W2=GND his product is not designed for protection against radio active rays. * When the pulse width is 5ns or less, it is -.8V. 2 OHM o., Ltd. ll rights reserved. Z22 4 2/23 Z22-2G ev.

3 BU9922NUX-3 operating characteristic (Unless otherwise specified, a=-4~+85, V=.7~5.5V) Limit arameter ymbol Min. yp. Max. Unit L frequency fl khz Data clock HIGH time thigh μs Data clock LOW time tlow μs D, L rise time **2 t - -. μs D, L fall time **2 tf - -. μs tart condition hold time thd: μs tart condition setup time tu: μs Input data hold time thd:d - - ns Input data setup time tu:d - - ns Output data delay time td. -.9 μs Output data hold time tdh. - - μs top condition setup time tu:o μs Bus release time before transfer start tbuf μs Internal write cycle time tw ms Noise removal valid period (D, L terminal) ti - -. μs W hold time thd:w. - - μs W setup time tu:w. - - μs W valid time thigh:w. - - μs * Not % EED. *2 It is recommended that t/tf is less than 3ns fundamentally. When t/tf is more than 3ns and less than us, it is possible that other device on the same bus are entered unintended start/stop condition. For prevent it, note in designing the timing. ondition Input data level:vil=.2 Vcc VIH=.8 Vcc Input data timing refarence level:.3 Vcc/.7 Vcc Output data timing refarence level:.3 Vcc/.7 Vcc ise/fall time : 2ns ync data input / output timing t tf thigh L 7% 7% 7% 7% 3% 3% 3% 3% 7% D (input) 7% tu:d 7% 7% tbuf tlow td thd:d 7% 3% tdh D() D D D(n) 7% tw D (output) Input read at the rise edge of L Data output in sync with the fall of L Fig.-(a) ync data input / output timing 7% 3% 7% 3% 3% tu:w Fig.2 W timing at write execution 3% thd:w O ONDIION 7% 7% 7% D() D(n) tu: 7% thd: tu:o D D thigh:w 7% tw 3% 3% 7% 7% ONDIION Fig.-(b) tart-stop bit timing O ONDIION Fig.3 W timing at write cancel D 7% 7% write data (n-th address) tw O ONDIION ONDIION Fig.-(c) Write cycle timing 2 OHM o., Ltd. ll rights reserved. Z22 4 3/23 Z22-2G ev.

4 BU9922NUX-3 Block diagram Vcc 2bit EEOM array 2bit EEOM array 8 Vcc2 8bit 8bit GND 2 Data register Word ddress register 8bit ddress decorder ddress decorder 8bit Word ddress register Data register 7 W2 L 3 start stop ontrol logic stop ontrol logic start 6 L2 D 4 Vcc level detect High voltage gen. High voltage gen. Vcc level detect 5 D2 ort EEOM ort2 EEOM Fig.4 Block Diagram in assignment and description in No. in Name Input/output Function Vcc - onnect the power source 2 GND - eference voltage of all input/output,v 3 L Input erial clock input for port 4 D input/output erial data input /serial data output for port EEOM 5 D2 input/output erial data input /serial data output for port2 EEOM 6 L2 input erial clock input for port2 EEOM 7 W2 input Write protect terminal for port2 EEOM 8 Vcc2 - onnect the power source Operating condition of port and port2 EEOM Vcc Vcc2 port port2 V V V Vcc V open Vcc V Vcc Vcc Vcc open open V open Vcc open open : operating possible : operating impossible 2 OHM o., Ltd. ll rights reserved. Z22 4 4/23 Z22-2G ev.

5 BU9922NUX-3 haracteristic data (he following values are yp. ones.) 6 6 H INU VOLGE : V IH (V) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig.5 'H' input voltage V IH (L,L2,D,D2,W2) L INU VOLGE : VIL(V) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig.6 'L' input voltage V IL (L,L2,D,D2,W2) L OUU VOLGE : V OL (V) a=-4 a=25 a=85 E L OUU VOLGE : V OL2 (V) a=-4 a=25 a=85 E L OUU UEN : I OL (m) Fig.7 'L' output voltage V OL -I OL (Vcc=.7V) L OUU UEN : I OL (m) Fig.8 'L' output voltage V OL2 -I OL (Vcc=2.5V) 2 OHM o., Ltd. ll rights reserved. Z22 4 5/23 Z22-2G ev.

6 BU9922NUX-3 haracteristic data (he following values are yp. ones.).2.2 E E INU LE UEN : I LI (u) a=-4 a=25 a=85 OUU LE UEN : I LO (u) a=-4 a=25 a= ULYVOLGE : Vcc(V) Fig.9 Input leak current I LI (L,L2,D,D2,W2) ULY VOLGE : Vcc(V) Fig. Output leak current I LO (D,D2) UEN ONUMION WIING : Icc(m) 2.5 a=-4 a=25 a=85 E UEN ONUMION EDING : Icc2(m) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig. urrent consumption at WIE operation I (fscl=4khz ) ULY VOLGE : Vcc(V) Fig.2 urrent consumption at ED operation I 2 (fscl=4khz B24/2/4/8/6/32/64/28/256-W) (fscl=4khz) 2 OHM o., Ltd. ll rights reserved. Z22 4 6/23 Z22-2G ev.

7 BU9922NUX-3 haracteristic data (he following values are yp. ones.) E NBY UEN : I B (u).5 a=-4 a=25 a=85 L FEQUENY : fscl(kh Z ) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig.3 tanby operation I B ULY VOLGE : Vcc(V) Fig.4 L frequency f L.5.8 a=-4 a=25 a=85.2 E D L H IME : t HIGH (us).6.4 E D L L IME : t LOW (us).9.6 a=-4 a=25 a= ULY VOLGE : Vcc(V) ULY VOLGE : Vcc(V) Fig.5 Data clock High eriod t HIGH Fig.6 Data clock Low eriod t LOW 2 OHM o., Ltd. ll rights reserved. Z22 4 7/23 Z22-2G ev.

8 BU9922NUX-3 haracteristic data (he following values are yp. ones.). ONDIION HOLD IME : t HD : (us) a=-4 a=25 a=85 E ONDIION E U IME : tu:(us) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) ULY VOLGE : Vcc(V) Fig.7 tart ondition Hold ime t HD : Fig.8 tart ondition etup ime t U : 5 5 INU D HOLD IME : t HD: (ns) a=-4 a=25 a=85 E INU D HOLD IME : t HD :D (ns) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig.9 Input Data Hold ime t HD : D (HIGH) ULY VOLGE : Vcc(V) Fig.2 Input Data Hold ime t HD : D (LOW) 2 OHM o., Ltd. ll rights reserved. Z22 4 8/23 Z22-2G ev.

9 BU9922NUX-3 haracteristic data (he following values are yp. ones.) 3 3 INU D E U IME : t U: D (ns) 2 - a=-4 a=25 a=85 E INU D E U IME : t U : D (ns) 2 - a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig.2 Input Data etup ime t U: D (HIGH) ULY VOLGE : Vcc(V) Fig.22 Input Data setup time t U : D (LOW) OUU D DELY IME : t D (us).5..5 a=-4 a=25 a=85 E OUU D DELY IME : t D (us).5..5 a=-4 a=25 a=85 E. E E E ULY VOLGE : Vcc(V) ULY VOLGE : Vcc(V) Fig..23 'L' Data output delay time t D Fig.24 'H' Data output delay time t D 2 OHM o., Ltd. ll rights reserved. Z22 4 9/23 Z22-2G ev.

10 BU9922NUX-3 haracteristic data (he following values are yp. ones.) 2. 2 O ONDIION EU IME : t su :O(us) a=-4 a=25 a=85 E BU OEN IME BEFOE NMIION : t BUF (us).5.5 a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) ULY VOLGE : Vcc(V) Fig.25 top condition setup time t U :O Fig.26 BU open time before transmission t BUF E.5 INENL WIING YLE IME : t W (ms) a=-4 a=25 a=85 NOIE EDUION EFEIVE IME : t l (L H) (us) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) Fig.27 Internal writing cycle time t W ULY VOLGE : Vcc(V) Fig.28 Noise reduction efection time t l (L H) 2 OHM o., Ltd. ll rights reserved. Z22 4 /23 Z22-2G ev.

11 BU9922NUX-3 haracteristic data (he following values are yp. ones.) NOIE EDUION EFEIVE IME : t l (L L)(us) a=-4 a=25 a=85 E NOIE EDUION EFEIVE IME : t l (D H)(us) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) ULY VOLGE : Vcc(V) Fig.29 Noise reduction efective time t l (L L) Fig.3 Noise resuction efecctive time t l (D H).6.2 NOIE EDUION EFFEIVE IME : t l (D L)(us) a=-4 a=25 a=85 E W D HOLD IME : t HD : W (us) a=-4 a=25 a=85 E ULY VOLGE : Vcc(V) ULYVOLGE : Vcc(V) Fig.3 Noise reduction efective time t l (D L) Fig.32 W data hold time thd:w 2 OHM o., Ltd. ll rights reserved. Z22 4 /23 Z22-2G ev.

12 BU9922NUX-3 haracteristic data (he following values are yp. ones.).2.2. E. E W E U IME : t U : W (us) a=-4 a=25 a=85 W EFFEIVE IME : t HIGH : W (us) a=-4 a=25 a= ULY VOLGE : Vcc(V) ULYVOLGE : Vcc(V) Fig.33 W setup time t U : W Fig.34 W efective time t HIGH : W 2 OHM o., Ltd. ll rights reserved. Z22 4 2/23 Z22-2G ev.

13 BU9922NUX-3 I 2 BU communication I 2 BU data communication I 2 BU data communication starts by start condition input, and ends by stop condition input. Data is always 8bit long, and acknowledge is always required after each byte. I 2 BU carries out data transmission with plural devices connected by 2 communication lines of serial data (D) and serial clock (L). mong devices, there are master that generates clock and control communication start and end, and slave that is controlled by address peculiar to devices. EEOM becomes slave. nd the device that outputs data to bus during data communication is called transmitter, and the device that receives data is called receiver. D L DDE /W condition D O condition tart condition (tart bit recognition) Before executing each command, start condition (start bit) where D goes from 'HIGH' down to 'LOW' when L is 'HIGH' is necessary. his I always detects whether D and L are in start condition (start bit) or not, therefore, unless this confdition is satisfied, any command is executed. top condition (stop bit recongnition) Each command can be ended by D rising from 'LOW' to 'HIGH' when stop condition (stop bit), namely, L is 'HIGH' cknowledge () signal his acknowledge () signal is a software rule to show whether data transfer has been made normally or not. In master and slave, the device (μ-om at slave address input of write command, read command, and this I at data output of read command) at the transmitter (sending) side releases the bus after output of 8bit data. he device (this I at slave address input of write command, read command, and μ-om at data output of read command) at the receiver (receiving) side sets D 'LOW' during 9 clock cycles, and outputs acknowledge signal ( signal) showing that it has received the 8bit data. his I, after recognizing start condition and slave address (8bit), outputs acknowledge signal ( signal) 'LOW'. Each write action outputs acknowledge signal ( signal) 'LOW', at receiving 8bit data (word address and write data). Fig.35 Data transfer timing Each read action outputs 8bit data (read data), and detects acknowledge signal ( signal) 'LOW'. When acknowledge signal ( signal) is detected, and stop condition is not sent from the master (μ-om) side, this I continues data output. When acknowledge signal ( signal) is not detected, this I stops data transfer, and recognizes stop cindition (stop bit), and ends read action. nd this I gets in status. D 2 OHM o., Ltd. ll rights reserved. Z22 4 3/23 Z22-2G ev.

14 BU9922NUX-3 Write ommand Write cycle rbitrary data is written to EEOM. When to write only byte, byte write is normally used, and when to write continuous data of 2 bytes or more, simultaneous write is possible by page write cycle. he maximum number of write bytes is up to 8. LVE DDE W I E WOD DDE D O D LINE W 7 W D7 D / W Fig.36 Byte write cycle (port EEOM) LVE DDE W I E WOD DDE D O D LINE * * * W 7 W D7 D / W Fig.37 Byte write cycle (port2 EEOM) * Don t are LVE DDE W I E WOD DDE(n) D(n) D(n+5) O D LINE W 7 W D7 D D / W Fig.38 age write cycle (port EEOM) *Don t are LVE DDE W I E WOD DDE(n) D(n) D(n+5) O D LINE * * * W 7 W D7 D D / W Fig.39 age write cycle (port2 EEOM) *Don t are During internal write execution, all input commands are ignored, therefore is not sent back. Data is written to the address designated by word address (n-th address) By issuing stop bit after 8bit data input, write to memory cell inside starts. When internal write is started, command is not accepted for tw (5ms at maximum). By page write cycle, the following can be written in bulk : nd when data of the maximum bytes or higher is sent, data from the first byte is overwritten. s for page write cycle, after the significant 5 bits of word address are designated arbitrarily, by continuing data input of 2 bytes or more, the address of insignificant 3 bits is incremented internally, and data up to 8 bytes can be written. Write protect (W2) terminal Write protect (W2) function When W2 terminal is set Vcc (H level), data rewrite of all addresses is prohibited (only port2 EEOM). When it is set GND (L level), data rewrite of all address is enabled. Be sure to connect this terminal to Vcc or GND, or control it to H level or L level. Do not use it open. In the case of use it as an OM, it is recommended to connect it to pull up or Vcc. t extremely low voltage at power ON / OFF, by setting the W terminal 'H', mistake write can be prevented. 2 OHM o., Ltd. ll rights reserved. Z22 4 4/23 Z22-2G ev.

15 BU9922NUX-3 ead ommand ead cycle Data of EEOM is read. In read cycle, there are random read cycle and current read cycle. andom read cycle is a command to read data by designating address, and is used generally. urrent read cycle is a command to read data of internal address register without designating address, and is used when to verify just after write cycle. In both the read cycles, sequential read cycle is available, and the next address data can be read in succession. D LINE LVE DDE W I E W 7 / W WOD DDE(n) W LVE DDE E D / W D(n) D7 D Fig.4 andom read cycle (port EEOM) O D LINE D LINE LVE DDE * * * LVE DDE W I E / W W 7 WOD DDE(n) W LVE DDE * * * D LINE E D / W Fig.4 andom read cycle (port2 EEOM) E D D(n) D7 D O D7 D(n) D LVE DDE O * * * E D It is necessary to input 'H' to the last. *Don t are It is necessary to input 'H' to the last. D7 D(n) D O D LINE / W Fig.42 urrent read cycle (port EEOM) LVE DDE E D D(n) D7 D / W Fig.43 urrent read cycle (port2 EEOM) D7 D(n+x) D O *Don t are LVE DDE / W Fig.44 equential read cycle (port EEOM) E D D(n) D(n+x) O It is necessary to input 'H' to the last. D LINE * ** D7 D D7 D / W *Don t are Fig.45 equential read cycle (port2 EEOM) In random read cycle, data of designated word address can be read. When the command just before current read cycle is random read cycle, current read cycle (each including sequential read cycle), data of incremented last read address (n)-th address, i.e., data of the (n+)-th address is output. When signal 'LOW' after D is detected, and stop condition is not sent from master (μ-om) side, the next address data can be read in succession. ead cycle is ended by stop condition where 'H' is input to signal after D and D signal is started at L signal 'H'. When 'H' is not input to signal after D, sequential read gets in, and the next data is output. herefore, read command cycle cannot be ended. When to end read command cycle, be sure input stop condition to input 'H' to signal after D, and to start D at L signal 'H'. equential read is ended by stop condition where 'H' is input to signal after arbitrary D and D is started at L signal 'H'. 2 OHM o., Ltd. ll rights reserved. Z22 4 5/23 Z22-2G ev.

16 BU9922NUX-3 oftware reset oftware reset is executed when to avoid malfunction after power on, and to reset during command input. oftware reset has several kinds, and 3 kinds of them are shown in the figure below. (efer to Fig.46, Fig.47, Fig.48.) In dummy clock input area, release the D bus ('H' by pull up). In dummy clock area, output and read data '' (both 'L' level) may be output from EEOM, therefore, if 'H' is input forcibly, output may conflict and over current may flow, leading to instantaneous power failure of system power source or influence upon devices. Dummy clock 4 tart 2 L D Normal command Normal command Fig.46 he case of dummy clock +++ command input tart Dummy clock 9 tart L D Normal command Normal command Fig.47 he case of +9 dummy clocks ++ command input tart 9 L D D Fig command input Normal command Normal command タ ト tart command from input. cknowledge polling During internal write execution, all input commands are ignored, therefore is not sent back. During internal automatic write execution after write cycle input, next command (slave address) is sent, and if the first signal sends back 'L', then it means end of write action, while if it sends back 'H', it means now in writing. By use of acknowledge polling, next command can be executed without waiting for tw = 5ms. When to write continuously, /W =, when to carry out current read cycle after write, slave address /W = is sent, and if signal sends back 'L', then execute word address input and data output and so forth. First write command During internal write, = HIGH is sent back. Write command O lave address H tw lave address H econd write command lave address tw H lave address L Word address L Data L O fter completion of internal write, =LOW is sent back, so input next word address and data in succession. Fig.49 ase to continuously write by acknowledge polling 2 OHM o., Ltd. ll rights reserved. Z22 4 6/23 Z22-2G ev.

17 BU9922NUX-3 W valid timing (write cancel) W2 is usually fixed to 'H' or 'L', but when W is used to cancel write cycle and so forth, pay attention to the following W valid timing. During write cycle execution, in cancel valid area, by setting W2='H', write cycle can be cancelled. In both byte write cycle and page write cycle, the area from the first start condition of command to the rise of clock to taken in D of data(in page write cycle, the first byte data) is cancel invalid area. W input in this area becomes Don't care. he area from the rise of L to take in D to input the stop condition is cancel valid area. nd, after execution of forced end by W, standby status gets in. ise of D taken clock ise of D L L D D D D D Enlarged view Enlarged view D W2 lave address L Word address L D7 D6 D5 D4 D3 D2 D D W cancel invalid area L Data W cancel valid area Data is not written. L O tw W cancel invalid area Fig.5 W valid timing ommand cancel by start condition and stop condition During command input, by continuously inputting start condition and stop condition, command can be cancelled. (Fig.5) However, in output area and during data read, D bus may output 'L', and in this case, start condition and stop condition cannot be input, so reset is not available. herefore, execute software reset. nd when command is cancelled by start, stop condition, during random read cycle, sequential read cycle, or current read cycle, internal setting address is not determined, therefore, it is not possible to carry out current read cycle in succession. When to carry out read cycle in succession, carry out random read cycle. L D tart condition top condition Fig.5 ase of cancel by start, stop condition during slave address input 2 OHM o., Ltd. ll rights reserved. Z22 4 7/23 Z22-2G ev.

18 BU9922NUX-3 I/O peripheral circuit ull up resistance of D terminal D is NMO open drain, so requires pull up resistance. s for this resistance value ( U ), select an appropriate value to this resistance value from microcontroller V IL, I L, and V OL -I OL characteristics of this I. If U is large, action frequency is limited. he smaller the U, the larger the consumption current at action. Maximum value of U he maximum value of U is determined by the following factors. D rise time to be determined by the capacitance (BU) of bus line of U and D should be t or below. nd timing should be satisfied even when D rise time is late. 2he bus electric potential to be determined by input leak total (I L ) of device connected to bus at output of 'H' to D bus and U should sufficiently secure the input 'H' level (V IH ) of microcontroller and EEOM including recommended noise margin.2vcc. V-ILU-.2 V VIH U.8V-VIH IL Ex.) V =3V IL=μ VIH=.7 V from2 U Microcontroller IL U IL BU9922NUX-3 D terminal 3 [kω] Minimum value of U he minimum value of U is determined by the following factors. When I outputs LOW, it should be satisfied that V OLMX =.4V and I OLMX =3m. Bus line capacity BU Fig.52 I/O circuit diagram V-VOL U IOL U V-VOL IOL 2VOLMX= should secure the input 'L' level (V IL ) of microcontroller and EEOM including recommended noise margin.vcc. VOLMX VIL-. V Ex.) V =3V VOL=.4V IOL=3m microcontroller, EEOM V IL =.3Vcc from U [Ω] nd VOL=.4[V] VIL=.3 3 =.9[V] herefore, the condition 2 is satisfied. ull up resistance of L terminal When L control is made at MO output port, there is no need, but in the case there is timing where L becomes 'Hi-Z', add a pull up resistance. s for the pull up resistance, one of several kω ~ several ten kω is recommended in consideration of drive performance of output port of microcontroller. 2 OHM o., Ltd. ll rights reserved. Z22 4 8/23 Z22-2G ev.

19 BU9922NUX-3 autions on microcontroller connection In I 2 BU, it is recommended that D port is of open drain input/output. However, when to use MO input / output of tri state to D port, insert a series resistance s between the pull up resistance pu and the D terminal of EEOM. his is controls over current that occurs when MO of the microcontroller and NMO of EEOM are turned ON simultaneously. s also plays the role of protection of D terminal against surge. herefore, even when D port is open drain input/output, s can be used. L U D 'H' output of microcontroller 'L' output of EEOM Microcontroller EEOM Fig.53-(a) I/O circuit diagram Over current flows to D line by 'H' output of microcontroller and 'L' output of EEOM. Fig.53-(b) Input / output collision timing Maximum value of s he maximum value of s is determined by the following relations. D rise time to be determined by the capacity (BU) of bus line of pu and D should be t or below. nd timing should be satisfied even when D rise time is late. 2he bus electric potential to be determined by pu and s the moment when EEOM outputs 'L' to D bus sufficiently secure the input 'L' level (V IL ) of microcontroller including recommended noise margin.vcc. V U (V-VOL) U+ + VOL+.V VIL IOL VOL VIL-VOL-.V.V-VIL U VIL Bus line capacity BU Micro controller EEOM Ex.)V=3V VIL=.3V VOL=.4V U=2kΩ Fig.54-(a) I/O ircuit Diagram.67[kΩ] Minimum value of s he minimum value of s is determined by over current at bus collision. When over current flows, noises in power source line, and instantaneous power failure of power source may occur. When allowable over current is defined as I, the following relation must be satisfied. Determine the allowable current in consideration of impedance of power source line in set and so forth. et the over current to EEOM m or below. V I U 'L'output V I Over current I 'H' output Microcontroller EEOM Fig.54-(b) I/O circuit diagram Ex.) V=3V, I=m 3-3 3[Ω] 2 OHM o., Ltd. ll rights reserved. Z22 4 9/23 Z22-2G ev.

20 BU9922NUX-3 I 2 BU input / output circuit Input (L,L2,W2) Fig.55-(a) Input pin circuit diagram Input / output (D,D2) Fig.55-(b) Input / output pin circuit diagram 2 OHM o., Ltd. ll rights reserved. Z22 4 2/23 Z22-2G ev.

21 BU9922NUX-3 Notes on power ON t power on, in I internal circuit and set, Vcc rises through unstable low voltage area, and I inside is not completely reset, and malfunction may occur. o prevent this, functions of O circuit and LV circuit are equipped. o assure the action, observe the following conditions at power on.. et D = 'H' and L ='L' or 'H 2. tart power source so as to satisfy the recommended conditions of t, t OFF, and Vbot for operating O circuit. V toff t Vbot ecommended conditions of t, toff,vbot t toff Vbot ms or below ms or larger.3v or below or below ms or larger.2v or below Fig.56 ise waveform diagram 3. et D and L so as not to become 'Hi-Z'. When the above conditions and 2 cannot be observed, take the following countermeasures. a) In the case when the above condition cannot be observed. When D becomes 'L' at power on. ontrol L and D as shown below, to make L and D, 'H' and 'H'. V tlow L D fter Vcc becomes stable tdh tu:d Fig.57 When L= 'H' and D= 'L' fter Vcc becomes stable tu:d Fig.58 When L='L' and D='L' b) In the case when the above condition 2 cannot be observed. fter power source becomes stable, execute software reset(5). c) In the case when the above conditions and 2 cannot be observed. arry out a), and then carry out b). Low voltage malfunction prevention function LV circuit prevents data rewrite action at low power, and prevents wrong write. t LV voltage (yp. =.2V) or below, it prevent data rewrite. Vcc noise countermeasures Bypass capacitor When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is recommended to attach a by pass capacitor (.μf) between I Vcc and GND. t that moment, attach it as close to I as possible. nd, it is also recommended to attach a bypass capacitor between board Vcc and GND. autions on use () Described numeric values and data are design representative values, and the values are not guaranteed. (2) We believe that application circuit examples are recommendable, however, in actual use, confirm characteristics further sufficiently. In the case of use by changing the fixed number of external parts, make your decision with sufficient margin in consideration of static characteristics and transition characteristics and fluctuations of external parts and our LI. (3) bsolute maximum ratings If the absolute maximum ratings such as impressed voltage and action temperature range and so forth are exceeded, LI may be destructed. Do not impress voltage and temperature exceeding the absolute maximum ratings. In the case of fear exceeding the absolute maximum ratings, take physical safety countermeasures such as fuses, and see to it that conditions exceeding the absolute maximum ratings should not be impressed to LI. (4) GND electric potential et the voltage of GND terminal lowest at any action condition. Make sure that each terminal voltage is lower than that of GND terminal. (5) erminal design In consideration of permissible loss in actual use condition, carry out heat design with sufficient margin. (6) erminal to terminal shortcircuit and wrong packaging When to package LI onto a board, pay sufficient attention to LI direction and displacement. Wrong packaging may destruct LI. nd in the case of shortcircuit between LI terminals and terminals and power source, terminal and GND owing to foreign matter, LI may be destructed. (7) Use in a strong electromagnetic field may cause malfunction, therefore, evaluate design sufficiently. 2 OHM o., Ltd. ll rights reserved. Z22 4 2/23 Z22-2G ev.

22 BU9922NUX-3 evision history Date evision hanges 9-Dec-2 Initial Document elease 2 OHM o., Ltd. ll rights reserved. Z /23 Z22-2G ev.

23 BU9922NUX-3 Ordering information B U N U X - 3 ackage NUX : VON8X23 ackaging and forming specification : Embossed tape and reel hysical Dimantion. ape abd eel information VON8X23.6MX.8 2.±..5± ±. IN M (.2) <ape and eel information> ape Embossed carrier tape Quantity 4pcs Direction of feed he direction is the pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand ( ) ± ± (Unit : mm) eel pin Direction of feed Order quantity needs to be multiple of the minimum quantity. Marking Diagram 2.±. roduct Name: BU BU9922NUX ±. IN M LO NO..6MX.25.5±..5.3±..4± (.2) Drawing No. : EX87-6 (UNI:mm) 2 OHM o., Ltd. ll rights reserved. Z /23 Z22-2G ev.

24 Notice recaution on using OHM roducts. Our roducts are designed and manufactured for application in ordinary electronic equipments (such as V equipment, O equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you intend to use our roducts in devices requiring extremely high reliability (such as medical equipment (Note ), transport equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property ( pecific pplications ), please consult with the OHM sales representative in advance. Unless otherwise agreed in writing by OHM in advance, OHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any OHM s roducts for pecific pplications. (Note) Medical Equipment lassification of the pecific pplications JN U EU HIN LⅢ LⅡb LⅢ LⅢ LⅣ LⅢ 2. OHM designs and manufactures its roducts subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. lease be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our roducts may cause. he following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. Our roducts are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. ccordingly, OHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any OHM s roducts under any special or extraordinary environments or conditions. If you intend to use our roducts under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our roducts in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our roducts outdoors or in places where the roducts are exposed to direct sunlight or dust [c] Use of our roducts in places where the roducts are exposed to sea wind or corrosive gases, including l2, H2, NH3, O2, and NO2 [d] Use of our roducts in places where the roducts are exposed to static electricity or electromagnetic waves [e] Use of our roducts in proximity to heat-producing components, plastic cords, or other flammable items [f] ealing or coating our roducts with resin or other coating materials [g] Use of our roducts without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our roducts by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the roducts in places subject to dew condensation 4. he roducts are not subject to radiation-proof design. 5. lease verify and confirm characteristics of the final or mounted products in using the roducts. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. void applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate ower Dissipation (d) depending on mbient temperature (a). When used in sealed area, confirm the actual ambient temperature. 8. onfirm that operation temperature is within the specified range described in the product specification. 9. OHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. recaution for Mounting / ircuit board design. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the OHM representative in advance. For details, please refer to OHM Mounting specification Notice - GE 24 OHM o., Ltd. ll rights reserved. ev.2

25 recautions egarding pplication Examples and External ircuits. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the roducts and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for roducts use. herefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. OHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. recaution for Electrostatic his roduct is electrostatic sensitive product, which may be damaged due to electrostatic discharge. lease take proper caution in your manufacturing process and storage so that voltage exceeding the roducts maximum rating will not be applied to roducts. lease take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). recaution for torage / ransportation. roduct performance and soldered connections may deteriorate if the roducts are stored in the places where: [a] the roducts are exposed to sea winds or corrosive gases, including l2, H2, NH3, O2, and NO2 [b] the temperature or humidity exceeds those recommended by OHM [c] the roducts are exposed to direct sunshine or condensation [d] the roducts are exposed to high Electrostatic 2. Even under OHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using roducts of which storage time is exceeding the recommended storage time period. 3. tore / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. Use roducts within the specified time after opening a humidity barrier bag. Baking is required before using roducts of which storage time is exceeding the recommended storage time period. recaution for roduct Label Q code printed on OHM roducts label is for OHM s internal use only. recaution for Disposition When disposing roducts please dispose them properly using an authorized industry waste company. recaution for Foreign Exchange and Foreign rade act ince our roducts might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with OHM representative in case of export. recaution egarding Intellectual roperty ights. ll information and data including but not limited to application example contained in this document is for reference only. OHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. OHM shall not be in any way responsible or liable for infringement of any intellectual property rights or other damages arising from use of such information or data.: 2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of OHM or any third parties with respect to the information contained in this document. Other recaution. his document may not be reprinted or reproduced, in whole or in part, without prior written consent of OHM. 2. he roducts may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of OHM. 3. In no event shall you use in any way whatsoever the roducts and the related technical information contained in the roducts or this document for any military purposes, including but not limited to, the development of mass-destruction weapons. 4. he proper names of companies or products described in this document are trademarks or registered trademarks of OHM, its affiliated companies or third parties. Notice - GE 24 OHM o., Ltd. ll rights reserved. ev.2

26 General recaution. Before you use our ro ducts, you are requested to care fully read this document and fully understand its contents. OHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny OHM s roducts against warning, caution or note contained in this document. 2. ll information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using OHM s roducts, please confirm the la test information with a OHM sale s representative. 3. he information contained in this doc ument is provi ded on an as is basis and OHM does not warrant that all information contained in this document is accurate an d/or error-free. OHM shall not be in an y way responsible or liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or concerning such information. Notice WE 24 OHM o., Ltd. ll rights reserved. ev.