AMC131M01DFMR datasheet(29/81 Pages) TI

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8.4 Device Functional Modes

Figure 8-12 shows a state diagram depicting the major functional modes of the AMC131M01 and the transitions

between them.

Reset

complete

GC_EN

Reset

Continuous

Conversion Mode

Global Chop

Mode

Standby

Mode

STANDBY

WAKEUP && GC_EN

STANDBY

WAKEUP

&& GC_EN

POR, pin reset, or

RESET command

Figure 8-12. State Diagram Depicting Device Functional Modes

8.4.1 Power-Up and Reset

The AMC131M01 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. Therefore,

the DC/DC converter is disabled when a reset occurs. The internal DC/DC converter must be enabled after any

type of reset for the device to begin generating conversion data, such as the power-on-reset, or a reset using a

RESET command, or a reset using the SYNC/RESET pin.

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 the nominal value. Internal circuitry powers up and

the registers are set to the 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.

See the Start-Up Behavior After Power-Up section for a recommended procedure to ensure a correct start-up

behavior at power-up.

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 before communicating with the device with SPI. Follow the

procedure described in the Start-Up Behavior After a Pin Reset or RESET Command section after the device is

reset.

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AMC131M01

SBASA57 – SEPTEMBER 2023

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