ADS1291IRSMT datasheet(46/83 Pages) TI2

46 / 83 page

START

DRDY

4 / f

CLK

4 / f

CLK

Data Updating

SETTLE

ADS1291, ADS1292, ADS1292R

SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

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Product Folder Links: ADS1291 ADS1292 ADS1292R

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8.5.1.12 Single-Shot Mode

The single-shot mode is enabled by setting the SINGLE_SHOT bit in the CONFIG1 register to '1'. In single-shot

mode, the ADS1291, ADS1292, and ADS1292R perform a single conversion when the START pin is taken high

or when the START opcode command is sent. As seen in Figure 50, when a conversion is complete, DRDY goes

low and further conversions are stopped. Regardless of whether the conversion data are read or not, DRDY

remains low. To begin a new conversion, take the START pin low and then back high, or transmit the START

opcode again. When switching from continuous mode to pulse mode, make sure the START signal is pulsed or

issue a STOP command followed by a START command.

This conversion mode is provided for applications that require non-standard or non-continuous data rates.

Issuing a START command or toggling the START pin high resets the digital filter, effectively dropping the data

rate by a factor of four. Note that this mode leaves the system more susceptible to aliasing effects, requiring

more complex analog anti-aliasing filters at the inputs. Loading on the host processor increases because it must

toggle the START pin or send a START command to initiate a new conversion cycle.

Figure 51. DRDY with No Data Retrieval in Single-Shot Mode

ADS1291IRSMT Datasheet(PDF) 46 Page - Texas Instruments