ADS1291IRSMT datasheet(39/83 Pages) TI2

39 / 83 page

GPIO1

GPIO2

BLKDLY

(Blocking Signal)

PHASE

(Modulation Clock)

ADS1291, ADS1292, ADS1292R

www.ti.com

SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

Product Folder Links: ADS1291 ADS1292 ADS1292R

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(1)

Specifications apply from –40°C to +85°C.

8.3.10.4.2

Internal Respiration Circuitry With External Clock (ADS1292R)

This mode is set by RESP_CTRL = 1. In this mode GPIO1 and GPIO2 are automatically configured as inputs.

GPIO1 and GPIO2 cannot be used for other purposes. The signals must be provided as described in Figure 43.

An external, synchronous master clock (CLK) is required for this mode in order to operate.

Figure 43. Internal Respiration (RESP_CTRL = 1) Timing Diagram

Table 12. Timing Characteristics for Figure 43(1)

PARAMETER

1.65 V

≤ DVDD ≤ 3.6 V

UNIT

MIN

TYP

MAX

tPHASE

Respiration phase delay

168.75

Degrees

tBLKDLY

Modulation clock rising edge to XOR signal

8.3.11 Setting the Device for Basic Data Capture

This section outlines the procedure to configure the device in a basic state and capture data. This procedure is

intended to put the device in a data sheet condition to check if the device is working properly in the user's

system. It is recommended that this procedure be followed initially to get familiar with the device settings. Once

this procedure has been verified, the device can be configured as needed. For details on the timings for

commands refer to the appropriate sections in the data sheet. Also, some sample programming codes are added

for the ECG-specific functions. Figure 44 details a flow chart of the configuration procedure.

8.3.11.1 Lead-Off

Sample code to set dc lead-off with current source or sink resistors on all channels

WREG LOFF 10h // Comparator threshold at 95% and 5%, current source or sink resistor // DC lead-off

WREG CONFIG2 E0h // Turn-on dc lead-off comparators

WREG LOFF_SENS 0Fh // Turn on both P- and N-side of all channels for lead-off sensing

Observe the status bits of the output data stream to monitor lead-off status.

ADS1291IRSMT Datasheet(PDF) 39 Page - Texas Instruments

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