Linear Technology LTC2977 Demo Board: Octal Power Supply Manager [Requires DC1613] DC2028A DC2028A Data Sheet

Product codes

DC2028A

LTC2977

2977fa

For more information

www.linear.com/LTC2977

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 ..............................................13

Block Diagram .............................................15

Operation...................................................16

Operation Overview ................................................ 16

EEPROM ............................................................. 17

Reset ...................................................................... 17

Write-Protect Pin .................................................... 17

Other Operations .................................................... 17

Clock Sharing ..................................................... 17

PMBus Serial Digital Interface ................................ 18

PMBus ................................................................ 18

Device Address ...................................................21

Processing Commands .......................................22

PMBus Command Summary ............................23

Summary Table ...................................................23

Data Formats ......................................................27

PMBus Command Description ..........................28

Addressing and Write Protect .................................28

PAGE ..................................................................28

WRITE_PROTECT ...............................................28

MFR_PAGE_FF_MASK .......................................29

MFR_I2C_BASE_ADDRESS ...............................29

MFR_COMMAND_PLUS, MFR_DATA_PLUS0,

MFR_DATA_PLUS1, MFR_STATUS_PLUS0, and

MFR_STATUS_PLUS1 ........................................30

Reading Fault Log Using Command Plus and

Mfr_data_plus0 ..................................................31

Peek Operation using Mfr_data_plus0 ...............32

Enabling and Disabling Poke Operations ............32

Poke Operation Using Mfr_data_plus0 ...............32

Command Plus Operations Using Mfr_data_plus1 . 32

Operation, Mode and EEPROM Commands ............33

OPERATION ........................................................33

ON_OFF_CONFIG ................................................34

CLEAR_FAULTS..................................................34

STORE_USER_ALL and RESTORE_USER_ALL .35

CAPABILITY ........................................................35

VOUT_MODE ......................................................35

Output Voltage Related Commands ........................36

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 ..................36

Input Voltage Related Commands ...........................36

VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT, VIN_

OV_WARN_LIMIT, VIN_UV_WARN_LIMIT and

VIN_UV_FAULT_LIMIT .......................................36

Temperature Related Commands ............................37

OT_FAULT_LIMIT, OT_WARN_LIMIT, UT_WARN_

LIMIT and UT_FAULT_LIMIT ...............................37

Timer Limits ...........................................................37

TON_DELAY, TON_RISE, TON_MAX_FAULT_

LIMIT and TOFF_DELAY......................................37

Fault Response for Voltages Measured by the High

Speed Supervisor ...................................................38

VOUT_OV_FAULT_RESPONSE and VOUT_UV_

FAULT_RESPONSE .............................................38

Fault Response for Values Measured by the ADC ...39

OT_FAULT_RESPONSE, UT_FAULT_RESPONSE,

VIN_OV_FAULT_RESPONSE and VIN_UV_FAULT_

RESPONSE .........................................................39

Timed Fault Response ............................................40

TON_MAX_FAULT_RESPONSE ..........................40

Status Commands .................................................. 41

STATUS_BYTE .................................................... 41

STATUS_WORD .................................................. 41

STATUS_VOUT ...................................................42

STATUS_INPUT ..................................................42

STATUS_TEMPERATURE ....................................42

STATUS_CML .....................................................43

STATUS_MFR_SPECIFIC ....................................43

ADC Monitoring Commands ...................................44

READ_VIN ..........................................................44

READ_VOUT .......................................................44

READ_TEMPERATURE_1 ...................................44

PMBUS_REVISION .............................................44

Manufacturer Specific Commands ..........................45

MFR_CONFIG_LTC2977 .....................................45

Tracking Supplies On and Off .............................46

Tracking Implementation ....................................48

MFR_CONFIG_ALL_LTC2977 ............................49

MFR_FAULTBz0_PROPAGATE, MFR_FAULTBz1_

PROPAGATE .......................................................50

MFR_PWRGD_EN .............................................. 51