ADM1272 datasheet(42/57 Pages) AD

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ADM1272

Data Sheet

Rev. B | Page 42 of 57

INPUT VOLTAGE UNDERVOLTAGE WARNING LIMIT REGISTER

Address: 0x58, Reset: 0x0000, Name: VIN_UV_WARN_LIMIT

This command sets the undervoltage warning limit for the VIN voltage, measured on the SENSE+ pin.

Table 19. Bit Descriptions for VIN_UV_WARN_LIMIT

Bits

Bit Name

Settings

Description

Reset

Access

[15:12]

RESERVED

Always reads as 0000.

0x0

RESERVED

[11:0]

VIN_UV_WARN_LIMIT

Undervoltage warning threshold for the VIN voltage, measured on

the SENSE+ pin. Expressed in direct format.

0x000

OVERPOWER WARNING LIMIT REGISTER

Address: 0x6B, Reset: 0x7FFF, Name: PIN_OP_WARN_LIMIT

This command sets the overpower warning limit for the power calculated based on VIN × IOUT.

Table 20. Bit Descriptions for PIN_OP_WARN_LIMIT

Bits

Bit Name

Settings

Description

Reset

Access

RESERVED

Always reads as 0.

0x0

RESERVED

[14:0]

PIN_OP_WARN_LIMIT

Overpower warning threshold for the VIN × IOUT power calculation,

expressed in direct format.

0x7FFF

STATUS BYTE REGISTER

Address: 0x78, Reset: 0x00, Name: STATUS_BYTE

This command provides status information for critical faults and certain top level status commands in the device. STATUS_BYTE is also

the lower byte returned by STATUS_WORD. A bit set to 1 indicates a fault or warning occurred.

Table 21. Bit Descriptions for STATUS_BYTE

Bits

Bit Name

Settings

Description

Reset

Access

RESERVED

Always reads as 0.

0x0

RESERVED

HOTSWAP_OFF

Hot swap gate is off. This bit is live.

0x0

The hot swap gate drive output is enabled.

The hot swap gate drive output is disabled, and the GATE pin is

pulled down. This can be due to, for example, an overcurrent fault

that causes the device to latch off, an undervoltage condition on

the UV pin, or the use of the OPERATION command to turn the

output off.

RESERVED

Always reads as 0.

0x0

RESERVED

IOUT_OC_FAULT

IOUT overcurrent fault. This bit is latched.

0x0

No overcurrent output fault detected.

The hot swap controller determined that the FET may be

overheating due to trying to current limit, causing the hot swap

gate drive to shut down.

VIN_UV_FAULT

VIN fault. This bit is latched.

0x0

No undervoltage input fault detected on the UVL/UVH pins.

An undervoltage input fault was detected on the UVL/UVH pins.

TEMP_FAULT

Temperature fault or warning. This bit is live.

0x0

There are no active status bits to be read by STATUS_TEMPERATURE.

There are one or more active status bits to be read by

STATUS_TEMPERATURE.

CML_FAULT

None of the above. This bit is latched.

0x0

No communications error detected on the I2C/PMBus interface.

An error was detected on the I2C/PMBus interface. Errors detected

are unsupported command, invalid PEC byte, and incorrectly

structured message.

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