ltc2978 Linear Technology Corporation, ltc2978 Datasheet - Page 29

• Manufacturer Part Number: ltc2978
• Description: Octal Pmbus Power Supply Monitor And Controller With Eeprom
• Manufacturer: Linear Technology Corporation

Fault Response for Values Measured by the ADC
OT_FAULT_RESPONSE, UT_FAULT_RESPONSE,
VIN_OV_FAULT_RESPONSE and VIN_UV_FAULT_
RESPONSE
The fault response documented here is for values that are
measured by the ADC. These values are measured over a
longer period of time and are not de-glitched. Note that in
addition to the response described by these commands,
the LTC2978 will also:
Data Contents
operaTion
BIT(S) SYMBOL
b[7:6] Ot_fault_response_action,
b[5:3] Ot_fault_response_retry,
b[2:0] Ot_fault_response_delay,
Ut_fault_response_action,
Vin_ov_fault_response_action,
Vin_uv_fault_response_action
Ut_fault_response_retry,
Vin_ov_fault_response_retry,
Vin_uv_fault_response_retry
Ut_fault_response_delay,
Vin_ov_fault_response_delay,
Vin_uv_fault_response_delay
OPERATION
Response action:
2’b00: The unit continues operation without interruption.
2’b01: The device shuts down and responds according to the retry setting in bits [5:3].
2’b10: The device shuts down and responds according to the retry setting in bits [5:3].
2’b11: The device shuts down and responds according to the retry setting in bits [5:3].
Response action:
3’b000: A zero value for the retry setting means that the unit does not attempt to restart. The output remains
disabled until the fault is cleared.
3’b001-111: The PMBus device attempts to restart continuously, without limitation, using Mfr_retry_delay,
until it is commanded OFF (by the CONTROLn pin or OPERATION command or both), bias power is removed,
or another fault condition causes the unit to shut down.
Hard coded to 3’b000. The unit turns off immediately.
• Set the appropriate bit(s) in the STATUS_BYTE
• Set the appropriate bit(s) in the STATUS_WORD
• Set the appropriate bit in the corresponding STATUS_VIN
• Notify the host by pulling the ALERTB pin low.
or STATUS_TEMPERATURE register, and
LTC2978

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