LTM4686BIVPBF datasheet(107/130 Pages) AD

107 / 130 page

LTM4686B

107

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

Table 29. GPIOn Propagate Fault Configuration. The GPIO0 and GPIO1 pins are designed to provide electrical notification of selected events to

the user. Some of these events are common to both output channels. Others are specific to an output channel. They can also be used to share faults

between channels.

BIT(S)

SYMBOL

OPERATION

b[3]

Reserved

b[2]

Mfr_gpio0_propagate_iout_oc,

Mfr_gpio1_propagate_iout_oc

0: No action if the IOUT_OC_FAULT_LIMIT fault is asserted

1: Associated output will be asserted low if the IOUT_OC_FAULT_LIMIT fault is asserted

GPIO0 is associated with page 0 OC faults

GPIO1 is associated with page 1 OC faults

b[1]

Mfr_gpio0_propagate_vout_uv,

Mfr_gpio1_propagate_vout_uv

0: No action if the VOUT_UV_FAULT_LIMIT fault is asserted

1: Associated output will be asserted low if the VOUT_UV_FAULT_LIMIT fault is asserted

GPIO0 is associated with page 0 UV faults

GPIO1 is associated with page 1 UV faults

b[0]

Mfr_gpio0_propagate_vout_ov,

Mfr_gpio1_propagate_vout_ov

0: No action if the VOUT_OV_FAULT_LIMIT fault is asserted

1: Associated output will be asserted low if the VOUT_OV_FAULT_LIMIT fault is asserted

GPIO0 is associated with page 0 OV faults

GPIO1 is associated with page 1 OV faults

*The PWRGD status is designed as an indicator and not to be used for power supply sequencing.

Fault Sharing Response

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

MFR_GPIO_RESPONSE

0xD5

Action to be taken by the device when the GPIOn

pin is asserted low.

R/W Byte

Reg

0x00

MFR_GPIO_RESPONSE

This command determines the controller’s response to the GPIOn pin being pulled low by an external source.

VALUE

MEANING

0xC0

GPIO_INHIBIT The LTM4686B will three-state the output in response to the GPIOn pin pulled low.

0x00

GPIO_IGNORE The LTM4686B continues operation without interruption.

The device also:

• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE

• Sets the MFR bit in the STATUS_WORD

• Sets the GPIOB bit in the STATUS_MFR_SPECIFIC command, and

• Notifies the host by asserting ALERT pin, unless masked. The ALERT pin pulled low can be disabled by setting bit[1]

of MFR_CHAN_CFG.

This command has one data byte.

LTM4686BIVPBF Datasheet(PDF) 107 Page - Analog Devices

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