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MAX15303 PMBus Command Set User’s Guide

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Fault-Related Commands

CLEAR_FAULTS

Reference:

Standard Command

Lockable:

Yes

Command Code:

0x03

Format:

N/A

Data Bytes:

Units:

N/A

Transfer:

Send Byte

Factory Value:

N/A

Description/Notes:

See Section 15.1 of the PMBus Specification Part II.

If the MAX15303 has latched off for a fault condition, sending the CLEAR_FAULTS command will cause

a restart.

VOUT_OV_FAULT_LIMIT

Reference:

Standard Command

Lockable:

Yes

Command Code:

0x40

Format:

Unsigned integer mantissa

Data Bytes:

Units:

Transfer:

Read/Write Word

Factory Value:

0x170A (1.440V)

Description/Notes:

See Section 15.2 of the PMBus Specification Part II.

VOUT_OV_FAULT_LIMIT mantissa data sent to and from the MAX15303 must be divided by 4096 to

determine the actual voltage value, according to the fixed value of VOUT_MODE

In the MAX15303, there are seven possible output voltage ranges based on seven corresponding

internal feedback divider taps. The MAX15303 hardware has 8-bit resolution for the overvoltage fault

limit within each of these seven ranges.

The desired value of VOUT_OV

_FAULT_LIMIT is retained in memory, regardless of limitations

imposed by the feedback divider range and the 8-bit fault limit resolution, but the read-back value is

based on actual hardware register settings.

The factory value of 0x170A (1.440V) will

be overridden during initialization to

VOUT_COMMAND x 1.15, unless a specific value has been written to the User Store.

VOUT_OV_FAULT_RESPONSE

Reference:

Standard Command

Lockable:

Yes

Command Code:

0x41

Format:

Bit field

Data Bytes:

Units:

N/A

Transfer:

Read/Write Byte

Factory Value:

0x80 (Stop regulating and remain off)

Description/Notes:

See Sections 10.5.1 and 15.3 of the PMBus Specification Part II.

Note that the MAX15303 does not support finite, non-zero restart-attempt counts. (Continuous

restart attempts are supported.)

The VOUT_OV_FAULT_RESPONSE command data comprises three bit-fields:

Bits [7:6] determine the basic fault-response mode. The MAX15303 supports the following modes:

00 Ignore the fault condition.

01 Continue operating and wait for the fault to abate for time specified in bits [2:0]. If the

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