LTC2978 datasheet(45/64 Pages) LINER

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LTC2978

2978fa

operaTion

MFR_VOUT_DISCHARGE_THRESHOLD

This register contains the coefficient that multiplies

VOUT_COMMAND in order to determine the OFF thresh-

old voltage for the associated output. If the output volt-

age has not decayed below MFR_VOUT_DISCHARGE_

THRESHOLD • VOUT_COMMAND prior to the channel

being commanded to enter/re-enter the ON state, bit [7]

in the STATUS_MFR_SPECIFIC register will be set and the

ALERTB pin will be asserted low. In addition, the channel

will not enter the ON state until the output has decayed

below its OFF threshold voltage.

Other channels can be held off if a particular output has

failed to discharge by using the bidirectional FAULTzn pins

(refertotheMFR_FAULTBzn_RESPONSEandMFR_FAULT-

Bzn_PROPAGATE registers).

MFR_VOUT_DISCHARGE_THRESHOLD Data Contents

BIT(S)

SYMBOL

OPERATION

b[15:0]

Mfr_vout_discharge_

threshold

The data uses the linear format:

k = Y • 2N

Where N=b[15:11] is a 5-bit two’s

complement integer and Y= b[10:0]

is an 11-bit two’s complement

integer.

Units: Dimensionless, this register

contains a coefficient.

MFR_FAULT_LOG_STORE

This command allows the user to transfer data from the

RAM buffer to EEPROM.

MFR_FAULT_LOG_RESTORE

This command allows the user to transfer a copy of the

fault-log data from the EEPROM to the RAM buffer. After

a restore the RAM buffer is locked until a successful

Mfr_fault_log read.

MFR_FAULT_LOG_CLEAR

This command initializes the EEPROM block reserved for

fault logging. Any previous fault log stored in EEPROM

will be erased by this operation.

MFR_FAULT_LOG_STATUS

Read only. This register is used to manage fault log

events.

Mfr_fault_log_status_eeprom is set after a MFR_FAULT_

LOG_STORE command or a faulted-off event triggers a

transfer of the fault log from RAM to EEPROM. This bit is

cleared by a MFR_FAULT_LOG_CLEAR command.

Mfr_fault_log_status_ram is set after a MFR_FAULT_

LOG_RESTORE to indicate that the data in the RAM has

been restored from EEPROM and not yet read using a

MFR_FAULT_LOG command. This bit is cleared by a

MFR_FAULT_LOG command.

MFR_FAULT_LOG_STATUS Data Contents

BIT(S) SYMBOL

OPERATION

b[1] Mfr_fault_log_status_ram

Fault log RAM status:

0: The fault log RAM allows

updates.

1: The fault log RAM is locked

until the next Mfr_fault_log

read.

b[0] Mfr_fault_log_status_eeprom Fault log EEPROM status:

0: The transfer of the fault log

RAM to the EEPROM is enabled.

1: The transfer of the fault

log RAM to the EEPROM is

inhibited.

LTC2978 Datasheet(PDF) 45 Page - Linear Technology

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