MAX34440 datasheet(35/43 Pages) MAXIM

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PMBus 6-Channel Power-Supply Manager

The MFR_SERIAL command loads the device with text (ISO/IEC 8859-1) characters that uniquely identify the device.

The maximum number of characters is 8. This data is written to internal flash using the STORE_DEFAULT_ALL com-

mand. The factory default text string value is 10101010.

Table 21. MFR_MODE

Note: VDD must be above 2.9V for the device to clear or log data into MFR_NV_FAULT_LOG. MFR_MODE should not be changed

while power supplies are being sequenced.

BIT

BIT NAME

MEANING

FORCE_NV_FAULT_LOG

Setting this bit to 1 forces the device to log data into the nonvolatile fault log. Once set, the

device clears this bit when the action is completed. The host must set again for subsequent

action. If an error occurs during this action, the device sets the CML bit in STATUS_BYTE

and STATUS_WORD; no bits are set in STATUS_CML.

CLEAR_NV_FAULT_LOG

Setting this bit to 1 forces the device to clear the nonvolatile fault log by writing FFh to all

byte locations. Once set, the device clears this bit when the action is completed. The host

must set again for subsequent action. If an error occurs during this action, the device sets

the CML bit in STATUS_BYTE and STATUS_WORD; no bits are set in STATUS_CML.

ALERT

0 = ALERT disabled (device does not respond to ARA).

1 = ALERT enabled (device responds to ARA and ARA must be used).

This bit always returns a 0.

SOFT_RESET

This bit must be set, then cleared and set again within 8ms for a soft reset to occur.

10:9

PGTIME[1:0]

PGTIME1

PGTIME0

TIME FROM POWER GOOD DETERMINED

UNTIL PG OUTPUT IS ASSERTED (ms)

Immediately

100

500

1000

This bit always returns a 0.

PSEN_PP_OD

Applies to all PSEN outputs.

0 = PSEN push-pull output.

1 = PSEN open-drain output.

PSEN_HI_LO

Applies to all PSEN outputs.

0 = PSEN active low.

1 = PSEN active high.

5:0

These bits always return a 0.

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