Maxim-integrated MAX15301 PMBus Command Set Manual de usuario descargar pdf (Pagina 21)

MAX15301 PMBus Command Set User’s Guide

Rev 1 Page 21 of 53

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 MAX15301 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 MAX15301 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

fault does not abate, shutdown and attempt to restart according to bits [5:3].

10 Stop regulating immediately, delay for the time specified in bits [2:0], then attempt to

restart according to bits [5:3]. (Default setting)

11 Stop regulating immediately, and then restart as soon as possible after the fault

condition abates.

Bits [5:3] determine the number of retry attempts. The MAX15301 supports only a subset of the full

PMBus functionality for this portion of the command:

000-110 No attempt is made to restart after a fault shutdown. (Default setting)

111 Attempt to restart continuously until commanded off, or until another fault

condition causes the unit to shut down.

Bits [2:0] determine the fault-tolerance or retry-delay timing. Each binary value in bits [2:0]

corresponds to a multiple of 100ms, up to a possible maximum of 111

bin

= 700ms. A value of 000

bin

will cause the MAX15301 to use the minimum possible timing value, typically about 30-40ms. (The

default timing for overvoltage faults is 000

bin

VOUT_UV_FAULT_LIMIT

Reference:

Standard Command

Lockable:

Yes

Command Code:

0x44

Format:

Unsigned integer mantissa

Data Bytes:

Units:

Transfer:

Read/Write Word

Factory Value:

0x019A (see Description)

Description/Notes:

See Section 15.6 of the PMBus Specification Part II.

VOUT_UV_FAULT_LIMIT mantissa data sent to and from the MAX15301 must be divided by 4096 to

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

In the MAX15301, there are seven possible output voltage ranges based on seven corresponding

internal feedback divider taps. The MAX15301 hardware has 8-bit resolution for the undervoltage

fault limit within each of these seven ranges.

The desired value of VOUT_UV_FAULT_LIMIT is retained in memory, regardless o

f 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 0x019A (0.100V) will be overridden during initialization to

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 52 53

Comentarios a estos manuales

Sin comentarios

Maxim-integrated MAX15301 PMBus Command Set Manual de usuario Pagina 21

Comentarios a estos manuales

Relacionado con productos y manuales para Hardware Maxim-integrated MAX15301 PMBus Command Set