SD bits ADC SOC. Features. Applications. Ordering Information. Description. Pin Diagram and Descriptions

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1 SD807 0 bits ADC SOC Features High precision ADC, ENOB=7.bits@8sps, differential or single-ended inputs Low noise, high input impedance preamplifier with selectable gain:,.5, 50, 00, or 00 8 bits RISC ultra low power MCU, 49 instructions and 6 stack levels. The MCU current consumption is 500uA typically at V and MHz operating clock rate, ua at standby and khz clock, and less than ua at sleep 8k Bytes OTP, 56 Bytes SRAM Low OTP programming voltage at.4 ~.6V, can replace external EEPROM Internal RC oscillator, no external clock needed 8 bits interrupt timer Built-in temperature sensor, supports single point calibration Selectable voltage source for external transducer excitation:.4v/.6v/.9v/.v, Flexible battery voltage detection:.4v ~.0V Schmitt trigger input, pull up resistor selectable Watch Dog Timer Low voltage detection and power on reset circuit Operating voltage range:.4v ~.6V Operating temperature range: -40 ~ 85 Description The SD807 is a CMOS SOC with built-in 0 bits ADC and 8k Bytes OTP memory. The built-in OTP has low programming voltage at.4v ~.6V. It can be used in place of external EEPROM. The IC is specially designed for body weight or other domestic weight scale with LED display. The IC was designed with ultra low power technology. Operates at V supply and halved internal RC oscillator frequency, the total typical operating current is 850uA (external transducer driving current not included). Such low current consumption is very suitable for battery powered applications. Three working modes are provided so users can select the optimum choice between speed and power. They are normal mode, standby mode, and sleep mode. Applications Body weight scale, kitchen scale, palm scale, portable scale, tire pressure gauge Ordering Information SOP6 package Pin Diagram and Descriptions Figure. Pad diagram SDIC Microelectronics Rev. 0.a May 07

2 P45 P-0 P5 P-0 BUZ INT-0 VSS AR SD807 Table. Pad Descriptions Pad No. Pin Name Attribute Description P0 I/O Digital port P0 VCP Analog Connect uf filter capacitor to AIP Analog Analog signal differential inputs 4 AIN Analog Should enable the internal pull-down resistor for unused input 5 AR Analog Internal LDO output for IC s internal analog module, can provide excitation to external transducer, connect 0.uF filter capacitor to VSS 6 Power Power supply voltage, connect 0.uF capacitor to VSS 7 VSS Ground Power ground 8 P0/INT0 I/O Digital port P0 or external interrupt INT0 9 P/INT I/O Digital port P or external interrupt INT 0 P/AIR/ LBTIN I/O/ Analog Digital port P, analog signal or reference voltage input with respect to VSS, or low battery detect LBTIN input VPP I OTP high voltage programming pin, connect uf capacitor to VSS P5/BUZ I/O Digital port P5 or buzzer output BUZ P45 I/O Digital port P P -- P I/O Digital port P- Remark: All I/O ports Pnn have internal pull-up option (default OFF) and input hysteresis at 0./0.7. Functional Block RC OSC (khz) RC OSC (4MHz) Timing Control Generator POR/LVD Power management Reference voltage Charge pump VPP VCP OTP 8k Bytes 8Bits RISC MCU WDT Sigma Delta ADC PGIA M U X VSS AIP AIN AIR Special Registers SRAM 56 Bytes AIR VSS Timer0 Battery Detect LBTIN IO port control Buzzer External interrupt Figure. Functional block diagram SDIC Microelectronics Rev. 0.a May 07 of 8

3 SD807 Typical Applications U P P Load cell AIN AR AIP P P4 AIP AIN AR C 0.uF R M C uf C 0.uF C4 0.uF P0 VCP AIP AIN AR VSS P0/INT0 SD807 P P P P45 P5/BUZ VPP P/AIR/LBTIN P/INT UNIT/LBTIN C5 uf Power supply input P5 VCC C6 0uF U 76 VIN VOUT GND C7 0.uF 0 UNIT UNIT R.8M R.M VCC LBTIN Figure. LED Body scale typical application diagram SDIC Microelectronics Rev. 0.a May 07 of 8

4 SD807 ADC Characteristics Table. ENOB and voltage noise Vn rms (AR=.4V, VREF=0.6V, SINC, Buffer on) ADC sampling rate = 8kHz OSR Gain ENOB Vn rms (nv) ENOB Vn rms (nv) ENOB Vn rms (nv) Gain ADC sampling rate = 56kHz OSR ENOB Vn rms (nv) ENOB Vn rms (nv) ENOB Vn rms (nv) Remark: The above data are averages based on multiple ICs measured results. Each IC contributes 04 data points. ENOB = FRS log ( ) Vrms, FRS is the Full Scale Voltage Range ( * Vref / Gain), Vrms is the rms Noise. SDIC Microelectronics Rev. 0.a May 07 4 of 8

5 IHRC(MHz) ILRC(KHz) IHRC(MHz) ILRC(KHz) SD807 Oscillator Characteristics Figure 4 and figure 5 are SD807 oscillating frequency as function of power supply voltage from five parts. 4. IHRC vs.5 ILRC vs (V) Figure 4. IHRC frequency vs voltage (V) Figure 5. ILRC frequency vs voltage Figure 6 and figure 7 are SD807 oscillating frequency as function of temperature from five parts. 4. IHRC vs Temperature (=.V) ILRC vs Temperature (=.V) Temperature( ) Figure 6. IHRC frequency vs temperature Temperature( ) Figure 7. ILRC frequency vs temperature SDIC Microelectronics Rev. 0.a May 07 5 of 8

6 Electrical Specifications Table. Absolute Maximum Ratings SD807 Symbol Parameter Minimum Maximum Unit T A Operating temperature C T S Storage temperature C V DD Supply voltage V Vpp Programming voltage V V IN, V OUT Digital input/output voltage -0. V DD +0. V T L Reflow temperature profile Per IPC/JEDECJ-STD-00C C Remarks:. CMOS device can easily be damaged by electrostatics. It must be stored in conductive foam, and careful not to exceed the operating voltage range.. Turn off power before insert or remove the device. Table 4. Electrical Specifications(=V, T A =5 ) Symbol Parameter Minimum Typical Maximum Unit Conditions/Remarks Supply voltage SDIC Microelectronics Rev. 0.a May 07 6 of V Analog modules operating voltage V FOSC Operating frequency MHz IHRC ILRC Internal high frequency RC oscillator Internal low frequency RC oscillator Digital modules and MCU operating voltage FOSC must be MHz when read/write tables in OTP MHz Frequency after calibration khz Frequency after calibration IDD Operating current ua IDD Operating current ua IDD Operating current ua Fsam ADC sampling rate khz OSR Over sampling rate MHz internal RC oscillator freq halved for MCU Digital and analog modules both active khz internal RC oscillator for MCU MCU at standby mode Analog modules inactive MCU at sleep mode Analog modules inactive NFbit Noise free bits bits Gain=00, input FSR=±4mV VINpga Vavddr PGIA differential input range AR Voltage output X gain -Vref/.5 -- Vref/.5.5X gain -Vref/50 -- Vref/50 mv 50X gain -Vref/00 -- Vref/00 00 X gain -Vref/00 -- Vref/00 00 X gain.4 -- ARX [:0]= ARX [:0]=0 V.9 -- ARX [:0]=0. -- ARX [:0]= Iavddr AR current ma POR POR voltage V LVD LVD voltage V

7 SD807 THlbt LVD hysteresis mv Vlbt Digital I/O parameter IOH IOL Low alarm threshold Output high current source Output low current sink LBTX[:0]=0000~00: Vlbt off LBTIN -- LBTX[:0]= LBTX[:0]= LBTX[:0]= V LBTX[:0]= LBTX[:0]= LBTX[:0]= LBTX[:0]= LBTX[:0]= ma VOH=-0.V ma VOL=0.V VIH Input high voltage V VIL Input low voltage V VOH Output high voltage V VOL Output low voltage VSS+0. V Rpu Pin pull up resistance kω =.0 Note:. Noise free bits and effective resolution are both related to the signal s full scale range. Its peak to peak or rms noise plays the decisive role.. The signal input range is limited by the differential signal input range and the absolute voltage at the input terminals. The first one is the real signal input range. It is affected by the PGIA gain and the ADC voltage reference choice. The second one includes both differential and common mode components and is mainly limited by the circuit. SDIC Microelectronics Rev. 0.a May 07 7 of 8

8 SD807 Packaging Information D A A A 0.5 A c θ L L b b With plating E E c c Base metal Cross section B-B b e B B Dimension:mm Symbol Min. Nom. Max. A.75 A A A b b c c D E E e.7bsc L L.05BSC θ Figure 8. SOP6 mechanical specification SDIC Microelectronics Rev. 0.a May 07 8 of 8