Datasheet

ADS1291
ADS1292
ADS1292R
SBAS502B –DECEMBER 2011–REVISED SEPTEMBER 2012 www.ti.com
PIN ASSIGNMENTS
NAME TERMINAL FUNCTION DESCRIPTION
AVDD 12 Supply Analog supply
AVSS 13 Supply Analog ground
CLK 17 Digital input Master clock input
CLKSEL 14 Digital input Master clock select
CS 18 Digital input Chip select
DGND 24 Supply Digital ground
DIN 19 Digital input SPI data in
DOUT 21 Digital output SPI data out
DRDY 22 Digital output Data ready; active low
DVDD 23 Supply Digital power supply
GPIO1/RCLK1 26 Digital input/output General-purpose I/O 1 or resp clock 1 (ADS1292R)
GPIO2/RCLK2 25 Digital input/output General-purpose I/O 2 or resp clock 2 (ADS1292R)
IN1N
(1)
3 Analog input Differential analog negative input 1
IN1P
(1)
4 Analog input Differential analog positive input 1
IN2N
(1)
5 Analog input Differential analog negative input 2
IN2P
(1)
6 Analog input Differential analog positive input 2
PGA1N 1 Analog output PGA1 inverting output
PGA1P 2 Analog output PGA1 noninverting output
PGA2N 7 Analog output PGA2 inverting output
PGA2P 8 Analog output PGA2 noninverting output
PWDN/RESET 15 Digital input Power-down or system reset; active low
RESP_MODN/IN3N
(1)
32 Analog input/output N-side respiration excitation signal for respiration or auxiliary input 3N
RESP_MODP/IN3P
(1)
31 Analog input/output P-side respiration excitation signal for respiration or auxiliary input 3P
Right leg drive input to MUX or RLD amplifier noninverting input; connect
RLDIN/RLDREF 29 Analog input
to AVDD if not used
RLDINV 28 Analog input Right leg drive inverting input; connect to AVDD if not used
RLDOUT 30 Analog input Right leg drive output
SCLK 20 Digital input SPI clock
START 16 Digital input Start conversion
VCAP1 11 — Analog bypass capacitor
VCAP2 27 — Analog bypass capacitor
VREFN 10 Analog input Negative reference voltage; must be connected to AVSS
VREFP 9 Analog input/output Positive reference voltage
(1) Connect unused analog inputs to AVDD.
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