AAUX1 |
15 |
I |
Auxiliary input to the ADC |
AAUX2 |
51 |
I |
Auxiliary input to the ADC |
AVDD |
18, 46, 80 |
— |
Supply (3.3 V) |
AVSS |
1, 6, 9, 14, 21, 32, 45, 60, 77 |
— |
Ground |
CLK |
79 |
I |
1-MHz clock |
DAC_FILT_IN |
20 |
I |
Current generator input. Connect ac blocking capacitor between this pin and pin 19. |
DACOUT |
19 |
O |
DAC output. Connect ac blocking capacitor between this pin and pin 20. |
INM1 |
3 |
I |
Instrumentation amplifier differential inputs for each of the four weight-scale channels |
INM2 |
5 |
INM3 |
11 |
INM4 |
13 |
INP1 |
2 |
INP2 |
4 |
INP3 |
10 |
INP4 |
12 |
INM_R |
8 |
— |
Connection of gain setting resistor for the instrumentation amplifier |
INP_R |
7 |
— |
IOUT0 |
27 |
O |
Current source output to electrodes |
IOUT1 |
26 |
IOUT2 |
25 |
IOUT3 |
24 |
IOUT4 |
23 |
IOUT5 |
22 |
NC |
43, 44, 52, 55, 61-76, 78 |
— |
Do not connect |
OUTM_I_FILT |
47 |
— |
I channel demodulator low pass filter, connect 10 µF between both pins |
OUTP_I_FILT |
48 |
OUTM_Q_FILT |
49 |
— |
Q channel demodulator low pass filter, connect 10 µF between both pins |
OUTP_Q_FILT |
50 |
RDY |
59 |
O |
Data ready |
RN0 |
31 |
O |
Current source output to calibration resistors |
RN1 |
30 |
RP0 |
29 |
RP1 |
28 |
RST |
53 |
I |
Reset. 0: reset, 1: normal operation. |
SCLK |
58 |
I |
Serial clock to latch input data (negative edge latch) |
SDIN |
57 |
I |
Serial data input |
SDOUT |
56 |
O |
Serial data output |
STE |
54 |
I |
SPI enable. 0: shift data in, 1: disable. |
VLDO |
16 |
O |
LDO output to supply the bridges (~1.7 V), connect 470 nF to AVSS |
VREF |
17 |
O |
Reference voltage (connect 470 nF to AVSS) |
VSENSEM_R0 |
42 |
I |
Input to differential amplifier from calibration resistors |
VSENSEM_R1 |
41 |
VSENSEP_R0 |
40 |
VSENSEP_R1 |
39 |
VSENSE0 |
38 |
I |
Input to differential amplifier from electrode |
VSENSE1 |
37 |
VSENSE2 |
36 |
VSENSE3 |
35 |
VSENSE4 |
34 |
VSENSE5 |
33 |