LTC2978A View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC2978A

8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement

Linear Technology 

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LTC2978A

Table of Contents

Features...................................................... 1

Applications................................................. 1

Typical Application......................................... 1

Description.................................................. 1

Absolute Maximum Ratings............................... 4

Order Information........................................... 4

Pin Configuration........................................... 4

Electrical Characteristics.................................. 5

PMBus Timing Diagram.................................... 9

Typical Performance Characteristics................... 10

Pin Functions............................................... 15

Block Diagram.............................................. 17

Operation................................................... 18

Operation Overview................................................. 18

EEPROM.............................................................. 18

Reset....................................................................... 19

Write-Protect Pin..................................................... 19

Other Operations..................................................... 19

Clock Sharing...................................................... 19

PMBus Serial Digital Interface.................................20

PMBus................................................................. 20

Device Address....................................................23

Processing Commands........................................ 24

Summary Table....................................................25

PMBus Command Summary............................. 25

Data Formats.......................................................29

PMBus Command Description........................... 30

Operation, Mode and EEPROM Commands.............30

PAGE................................................................... 30

OPERATION......................................................... 31

ON_OFF_CONFIG................................................. 32

CLEAR_FAULTS.................................................. 32

WRITE_PROTECT................................................ 33

STORE_USER_ALL and RESTORE_USER_ALL..33

CAPABILITY......................................................... 33

VOUT_MODE....................................................... 34

Output Voltage Related Commands.........................34

VOUT_COMMAND, VOUT_MAX, VOUT_MARGIN_

HIGH, VOUT_MARGIN_LOW, VOUT_OV_FAULT_

LIMIT, VOUT_OV_WARN_LIMIT, VOUT_UV_

WARN_LIMIT, VOUT_UV_FAULT_LIMIT, POWER_

GOOD_ON and POWER_GOOD_OFF...................34

Input Voltage Related Commands............................34

VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT, VIN_

OV_WARN_LIMIT, VIN_UV_WARN_LIMIT and

VIN_UV_FAULT_LIMIT........................................ 34

Temperature Related Commands.............................35

OT_FAULT_LIMIT, OT_WARN_LIMIT, UT_WARN_

LIMIT and UT_FAULT_LIMIT................................35

Timer Limits............................................................35

TON_DELAY, TON_RISE, TON_MAX_FAULT_

LIMIT and TOFF_DELAY......................................35

Fault Response for Voltages Measured by the High

Speed Supervisor....................................................36

VOUT_OV_FAULT_RESPONSE and VOUT_UV_

FAULT_RESPONSE.............................................. 36

Fault Response for Values Measured by the ADC.... 37

OT_FAULT_RESPONSE, UT_FAULT_RESPONSE,

VIN_OV_FAULT_RESPONSE and VIN_UV_FAULT_

RESPONSE.......................................................... 37

Timed Fault Response............................................. 37

TON_MAX_FAULT_RESPONSE........................... 37

Status Commands...................................................38

STATUS_BYTE:.................................................... 38

STATUS_WORD:.................................................. 39

STATUS_VOUT.................................................... 39

STATUS_INPUT................................................... 40

STATUS_TEMPERATURE..................................... 40

STATUS_CML...................................................... 41

STATUS_MFR_SPECIFIC..................................... 41

ADC Monitoring Commands.................................... 42

READ_VIN........................................................... 42

READ_VOUT........................................................ 42

READ_TEMPERATURE_1 ................................... 42

PMBUS_REVISION.............................................. 42

Manufacturer Specific Commands...........................43

MFR_CONFIG_LTC2978...................................... 43

MFR_CONFIG_ ALL_LTC2978............................. 44

MFR_FAULTBz0_PROPAGATE, MFR_FAULTBz1_

PROPAGATE........................................................ 45

MFR_PWRGD_EN............................................... 46

MFR_FAULTB00_RESPONSE, MFR_FAULTB01_

RESPONSE, MFR_FAULTB10_RESPONSE and

MFR_FAULTB11_RESPONSE............................... 47

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