Single-Ended Bus Transceiver

Transcription

1 Single-Ended Bus Transceiver FEATURES Operating Power Supply Range 6 36 Reverse Battery Protection Down to 24 Standby Mode With ery Low Current Consumption I BAT(SB) = 1 = 0.5 Low Quiescent Current in OFF Condition I BAT = 120 A and I DD 10 A ISO 9141 Compatible Overtemperature Shutdown Function For K Output Defined K Output OFF for Open GND Defined Receive Output Status for Open K Input Defined K Output OFF for Input Open Open Drain Fault Output 2-k ESD Typical Transmit Speeds of 200 kbaud DESCRIPTION The Si9241AEY is a monolithic bus transceiver designed to provide bidirectional serial communication in automotive diagnostic applications. The device incorporates protection against overvoltages and short circuits to. The transceiver pin is protected and can be driven beyond the voltage. The Si9241AEY is built on the BiC/DMOS process. An epitaxial layer prevents latchup. The output is capable of driving CMOS or 1 LSTTL load. The Si9241AEY is available in a space efficient 8-pin SO package. It operates reliably over the automotive temperature range (40 to 125 C). The Si9241AEY is available in both standard and lead (Pb)-free packages. PIN CONFIGURATION AND FUNCTIONAL BLOCK DIAGRAM 2 K Fault Detector FAULT GND 1

2 OUTPUT TABLE AND STATE DIAGRAMS Power On Power On Over Temp A = 1 A = 0 Over Temp Short Circuit B = 1 B = 0 INPUTS STATE ARIABLE OUTPUT TABLE A B K FAULT Comments X X 0 1 K HiZ 0 Over Temp 0 X 1 0 K HiZ 0 Short Circuit Note: Over Temp is an internal condition, not meant to be a logic signal. 1 X Receive Mode 1 X X = 1 or 0 HiZ = High Impedance State ABSOLUTE MAXIMUM RATINGS oltage Referenced to Ground oltage On to 45 oltage K to ( 1 ) oltage Difference (BAT, K) oltage or Max. Current On Any Pin (Except, K) to ( 0.3 ) or 10 ma oltage on K Pin Only, Short Circuit Duration (to or GND) Continuous Operating Temperature (T A ) to 125 C Junction and Storage Temperature to 150 C Thermal Resistance JA C/W Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE oltage Referenced to Ground to to 36 K to 36 Digital Inputs to 2

3 SPECIFICATIONS Parameter Transmitter and Logic Levels Symbol Test Conditions Unless Specified Limits 40 to 125 C = 4.5 to 5.55 = 6 to 36 Temp a Min b Typ c Max b Unit, Input Low oltage ILT Full 1.5, Input High oltage IHT Full 3.5 Input Capacitance d C INT Full 10 pf, Input Pull-up Resistance R, R = 5.5, or = 1.5, 3.5 Full k K Transmit R L = 510 5%, = 6 to 18 Full 0.2 K Output Low oltage OLK R L = 1 k 5%, = 16 to 36 Full 0.2 R L = 510 5%, = 4.5 Full 1.2 K Output High oltage OHK R L = 1 k 5%, = 16 to 36 Full 0.95 R L = 510 5%, = 4.5 to 18 Full 0.95 K Rise, Fall Times t r, t f See Test Circuit Full 9.6 s K Output Sink Resistance Rsi K Output Capacitance d C O = 0, = 0 Receiver Full 110 Full 20 pf K Input Low oltage ILK Full 0.35 K Input High oltage IHK Full 0.65 K Input Hysteresis,c, d HYS Full 0.05 K Input Currents I IHK IHK = Full 20 A Output Low oltage OLR = 4 ILK = 0.35 I OLR = 1 ma Full 0.4 Pull-up Resistance R Full 5 20 k R L = 510 5%, = 6 to 18 C L = 10 nf, See Test Circuit Turn On Delay t d(on) R L = 1 k 5%, = 16 to 36 C L = 4.7 nf, See Test Circuit R L = 510 5%, = 6 to 18 C L = 10 nf, See Test Circuit Turn Off Delay t d(off) R L = 1 k 5%, = 16 to 36 C L = 4.7 nf, See Test Circuit Supplies Bat Supply Current On I BAT(on) = = 0, 16 Full ma Bat Supply Current Off I BAT(off) = High, 12, = High f Full Bat Supply Current Standby I BAT(SB) 0.5, 12 Full 1 10 Logic Supply Current On I DD(on) 5.5, = 0 Full ma Logic Supply Current Off I DD(off) = High, 12, = High f Full 10 Miscellaneous Transmit Baud Rate BR T R L = 510, C L = 10 nf Full 10.4 Receive Baud Rate c BR R 6 < 16, C = 20 pf Full 200 Transmission Frequency f K-K 6 < 16, R K = 510, C K 1.3 nf Full khz Fault Output Low oltage OLF = T X = 0, K =, I OLF = 1 ma Full 0.4 Minimum Pulse Width d, e t cs Full 1 s Over Temperature Shutdown d T SHUT Temperature Rising Temperature Shutdown Hysteresis c T HYST 30 Notes a. Room = 25 C, Cold and Hot = as determined by the operating temperature suffix. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. d. Guaranteed by design, not subject to production test. e. Minimum pulse width to reset a fault condition. f. High referes to Logic High and Low refers to Logic Low. s A kbaud C 3

4 PIN CONFIGURATION Narrow Body SO Package FAULT Top iew K GND ORDERING INFORMATION Part Number Temperature Range Si9241AEY-T1 40 to 125 C Si9241AEY-T1 E3 (Lead (Pb)-Free) PIN DESCRIPTION Pin Number Symbol Description 1 Positive Power Supply 2 Transmit, Input 3 Chip Select, Input 4 FAULT Fault, Open Drain Output 5 GND Ground Connection 6 K Transmit/Receive, Bidirectional 7 Battery Power Supply 8 Receiver, Output FUNCTIONAL DESCRIPTION The Si9241AEY can be either in transmit or receive mode and it contains over temperature, and short circuit fault detection circuits. The voltage on K is internally compared to /2. If the voltage on the K pin is less than /2 then output will be low. If the voltage on the K pin is greater than /2 then output will be high. In order to be in transmit mode, must be set low. When and are set low the internal MOSFET will turn on, causing the K pin to be low. In the transmit mode, the processor monitors and. When the two mirror each other there is no fault. In the event of over temperature, or short 4 circuit to, the Si9241AEY will turn off the K output to protect the IC and the external open drain FAULT pin will be asserted. The K pin will stay in high impedance and will follow the K pin. The fault will be reset when is toggled high., and pins have an internal pull up resistor to while the K pin has internal pull down resistors. When any one of the, or GND pins is open the K output is off. When is set high the Si9241AEY is in receive mode and the internal MOSFET for the K pin is turned off. The output will follow the K pin. If is low while the IC is receiving data, an incorrect fault signal will occur. To inhibit the short detect, tie and together.

5 TEST CIRCUIT AND TIMING DIAGRAMS (TRANSMIT ONLY) t d(off) t d(on) Si9241AEY min 80% 80% R L K C L 20% 20% K t r t f GND R L = 510, C L = 10 nf, = 6 to 18 R L = 1 k, C L = 4.7 nf, = 16 to 36 APPLICATION CIRCUIT ECU Si9241AEY Diagnostic Tester K-Line B 510 I/Os Microcontroller 0.4 Si9241AEY L-Line C1 0.1 F 50 C1 0.1 F Bus ECU = Electronic Control Unit 5

6 Legal Disclaimer Notice ishay Disclaimer All product specifications and data are subject to change without notice. ishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, ishay ), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. ishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify ishay s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of ishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling ishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify ishay for any damages arising or resulting from such use or sale. Please contact authorized ishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: Revision: 18-Jul-08 1