ADP1055ACPZ-R7 datasheet(76/140 Pages) AD

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ADP1055

Data Sheet

Rev. A | Page 76 of 140

POUT_OP_FAULT_RESPONSE

The POUT_OP_FAULT_RESPONSE command instructs the device on the actions to take due to an output overpower fault condition.

The device notifies the host and sets the IOUT_OC_FAULT bit in the STATUS_BYTE register, the IOUT/POUT bit in the STATUS_WORD

Table 70. Register 0x69—POUT_OP_FAULT_RESPONSE

Bits

Bit Name

R/W

Description

[7:6]

Response

R/W

Determines the device response to an overpower fault condition.

Bit 7

Bit 6

Response

Do nothing.

Continue operation for the delay time (Bits[2:0]). If the fault persists, retry the

number of times specified by Bits[5:3].

Shut down, disable the output, and respond as programmed in the retry

setting (Bits[5:3]).

Disable the output while the fault is present. Operation resumes and the

output is enabled when the fault condition no longer exists.

[5:3]

Retry setting

R/W

Number of retry attempts following a fault condition. A fault condition can be cleared by a reset,

a power-off/power-on sequence, or a loss of bias power.

Bit 5

Bit 4

Bit 3

Number of Retries

Infinite

[2:0]

Delay times

R/W

Number of delay time units (see Register 0xFE3E).

STATUS_BYTE

The STATUS_BYTE register returns the lower byte of the STATUS_WORD register. A value of 1 in this command indicates that a fault

has occurred. As per the PMBus standard, the BUSY bit is writable to allow the user to clear that latched bit using a write command with

a 1 to Bit 7, similar to other STATUS_xxx commands. The other bits in this register cannot be cleared with a write to the STATUS_BYTE

command, but should be cleared with a write to the STATUS_VOUT, STATUS_IOUT, STATUS_INPUT, STATUS_TEMP, or

STATUS_CML command.

Table 71. Register 0x78—STATUS_BYTE

Bits

Bit Name

R/W

Description

BUSY

R/W

This bit is asserted if the device is busy and unable to respond.

POWER_OFF

This bit is asserted if the unit is not providing power to the output.

VOUT_OV_FAULT

An output overvoltage fault has occurred.

IOUT_OC_FAULT

An output overcurrent fault has occurred.

VIN_UV_FAULT

An input undervoltage fault has occurred.

TEMPERATURE

A temperature fault or warning has occurred.

CML

A communications, memory, or logic fault has occurred.

NONE_OF_THE_ABOVE

A fault or warning not listed in Bits[7:1] has occurred.

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