ADS131M08IPBSR datasheet(31/118 Pages) TI2

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8.4 Device Functional Modes

Figure 8-13 shows a state diagram depicting the major functional modes of the ADS131M08 and the transitions

between them.

Reset

complete

SYNC

GC_EN

Current detection

complete

GC_EN

Reset

Continuous

Conversion Mode

Global-Chop

Mode

Current

Detect Mode

Standby

Mode

STANDBY

WAKEUP && GC_EN

STANDBY

WAKEUP

&& GC_EN

POR, pin reset, or

RESET command

Figure 8-13. State Diagram Depicting Device Functional Modes

8.4.1 Power-Up and Reset

The ADS131M08 is reset in one of three ways: by a power-on reset (POR), by the SYNC/RESET pin, or by a

RESET command. After a reset occurs, the configuration registers are reset to the default values and the device

begins generating conversion data as soon as a valid MCLK is provided. In all three cases a low to high

transition on the DRDY pin indicates that the SPI interface is ready for communication. The device ignores any

SPI communication before this point.

8.4.1.1 Power-On Reset

Power-on reset (POR) is the reset that occurs when a valid supply voltage is first applied. The POR process

requires tPOR from when the supply voltages reach 90% of their nominal value. Internal circuitry powers up and

the registers are set to their default state during this time. The DRDY pin transitions from low to high immediately

after tPOR indicating the SPI interface is ready for communication. The device ignores any SPI communication

before this point.

8.4.1.2 SYNC/RESET Pin

The SYNC/RESET pin is an active low, dual-function pin that generates a reset if the pin is held low longer than

tw(RSL). The device maintains a reset state until SYNC/RESET is returned high. The host must wait for at least

tREGACQ after SYNC/RESET is brought high or for the DRDY rising edge before communicating with the device.

Conversion data are generated immediately after the registers are reset to their default values, as described in

the Fast Startup Behavior section.

8.4.1.3 RESET Command

The ADS131M08 can be reset via the SPI RESET command (0011h). The device communicates in frames of a

fixed length. See the SPI Communication Frames section for details regarding SPI data framing on the

ADS131M08. The RESET command occurs in the first word of the data frame, but the command is not latched

by the device until the entire frame is complete. After the response completes channel data and CRC words are

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ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

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