SI8900 Datasheet, PDF (23/32 Pages) Silicon Laboratories – ISOLATED MONITORING ADC

7. Device Pin Assignments
Si8900/1/2
VDDA
VREF
AIN0
AIN1
AIN2
NC
RST
GNDA
Si8900
VDDB
NC
NC
Rx
Tx
NC
VDDB
GNDB
VDDA
VREF
AIN0
AIN1
AIN2
RST
RSDA
GNDA
Si8901
VDDB
NC
NC
SCL
SDA
NC
VDDB
GNDB
VDDA
RST
NC
VREF
AIN0
AIN1
AIN2
GNDA
Figure 18. Si8900/1/2 Pinout (16SOW)
Table 6. Si8900/1/2 Pin Assignments
Pin Si8900 Si8901 Si8902
Pin ^{Pin Pin}
Description
1
VDDA
Input side VDD bias voltage (typically 3.3 V)
2
VREF
RST Si8900/1: External voltage reference input.
Si8902: Active low reset.
3 AIN0 AIN0 NC Si8900: ADC analog input channel 0.
Si8901: ADC analog input channel 0.
Si8902: No connection
4 AIN1 AIN1 VREF Si8900: ADC analog input channel 1.
Si8901: ADC analog input channel 1.
Si8902: External VREF in.
5 AIN2 AIN2 AIN0 Si8900: ADC analog input channel 2.
Si8901: ADC analog input channel 2.
Si8902: ADC analog input channel 0.
6
NC RST AIN1 Si8900: No Connection.
Si8901: Active low reset.
Si8902: ADC analog input channel 1.
7
RST RSDA AIN2 Si8900: Active low reset.
Si8901: RSDA bias resistor (typically 5 k).
Si8902: ADC analog input channel 2.
8
GNDA
Input side ground
9
GNDB
Output side ground
10
VDDB
Output side VDD bias voltage (2.7 V to 5.5 V)
11
NC
EN Si8900/1: No connection. Si8902: SPI Port Enable.
12
Tx SDA SDI Si8900: UART unidirectional transmit output.
Si8901: I²C Bidirectional data input/output.
Si8902: SPI port Serial data in.
Si8902
VDDB
NC
SDO
SCLK
SDI
EN
VDDB
GNDB
Rev. 1.1
23