LTM2987 datasheet(3/114 Pages) AD

3 / 114 page

LTC2971

Rev. 0

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CLEAR_FAULTS ........................................................................... 70

STATUS_BYTE ............................................................................. 71

STATUS_WORD ........................................................................... 71

STATUS_VOUT............................................................................. 72

STATUS_IOUT.............................................................................. 72

STATUS_INPUT............................................................................ 72

STATUS_TEMPERATURE............................................................. 73

STATUS_CML............................................................................... 73

STATUS_MFR_SPECIFIC ..............................................................74

MFR_PADS ...................................................................................74

MFR_COMMON............................................................................ 75

MFR_STATUS_2 .......................................................................... 76

MFR_FIRST_FAULT ..................................................................... 76

Telemetry........................................................................................... 77

READ_VIN .................................................................................... 77

READ_IIN ..................................................................................... 77

READ_PIN.................................................................................... 77

READ_VOUT................................................................................. 77

READ_IOUT.................................................................................. 78

MFR_IIN_PEAK............................................................................ 78

READ_TEMPERATURE_2 ............................................................ 78

READ_POUT ................................................................................ 79

MFR_READ_IOUT........................................................................ 79

MFR_IOUT_SENSE_VOLTAGE ..................................................... 80

MFR_VIN_PEAK........................................................................... 80

MFR_TEMPERATURE_1_MIN...................................................... 81

Fault Logging..................................................................................... 81

Fault Log Operation...................................................................... 81

MFR_FAULT_LOG_STORE........................................................... 82

MFR_FAULT_LOG_RESTORE ...................................................... 82

MFR_FAULT_LOG_CLEAR........................................................... 82

MFR_FAULT_LOG_STATUS......................................................... 82

MFR_FAULT_LOG ........................................................................ 82

MFR_FAULT_LOG Read Example ................................................ 85

Identification/Information ................................................................. 90

CAPABILITY ................................................................................. 90

PMBUS_REVISION ...................................................................... 90

MFR_SPECIAL_ID ....................................................................... 90

MFR_SPECIAL_LOT .................................................................... 91

MFR_INFO.................................................................................... 91

User Scratchpad ................................................................................ 91

USER_DATA_00, USER_DATA_01, USER_DATA_02, USER_

DATA_03, USER_DATA_04 and MFR_LTC_RESERVED_2 ......... 91

Applications Information ...................................................... 92

Overview............................................................................................ 92

Powering the LTC2971 ...................................................................... 92

Setting Command Register Values.................................................... 92

Measuring Input Current ................................................................... 92

Measuring Input Voltage ................................................................... 93

Measuring Input Power ..................................................................... 93

Measuring Input Energy .................................................................... 93

Sequence, Servo, Margin and Restart Operations............................ 93

Command Units On or Off ........................................................... 93

ON Sequencing ............................................................................ 94

ON State Operation ...................................................................... 94

Servo Modes................................................................................ 94

DAC Modes .................................................................................. 94

Margining..................................................................................... 95

Off Sequencing ............................................................................ 95

VOUT Off Threshold Voltage......................................................... 95

Automatic Restart via MFR_RESTART_DELAY Command and

CONTROL Pin............................................................................... 95

Fault Management ............................................................................. 96

Output Overvoltage and Undervoltage Faults.............................. 96

Output Overvoltage, Undervoltage, and Overcurrent Warnings.. 96

Configuring the AUXFAULTB Output............................................ 96

Multi-Channel Fault Management................................................ 97

Interconnect Between Multiple ADI POWER MANAGERS................. 98

Application Circuits ........................................................................... 99

Trimming and Margining DC/DC Converters with External

Feedback Resistors and Positive VFB.......................................................99

Four-Step Resistor Selection Procedure for DC/DC Converters

with External Feedback Resistors and Positive VFB...........................99

Trimming and Margining DC/DC Converters with a Trim Pin.... 100

Trimming and Margining DC/DC Converters with External

Feedback Resistors and Negative VFB....................................................100

Five-Step Resistor Selection Procedure for DC/DC Converters

with External Feedback Resistors and Negative VFB........................100

The following five-step procedure should be used to calculate the

resistor values required for the application circuit shown in Figure

31. .............................................................................................. 100

Trimming and Margining Inverting DC/DC Converters with

External Feedback Resistors and Current FBX .......................... 102

Four-Step Resistor Selection Procedure for Inverting DC/DC

Converters with External Feedback Resistors and Current FBX 102

Measuring Output with a Sense Resistor .................................. 104

Measuring Output with Inductor DCR ....................................... 104

Single Phase Design Example.................................................... 104

Measuring Multiphase Currents ................................................ 104

LT3086 IMON Design Example.................................................. 105

Anti-Aliasing Filter Considerations ............................................ 105

Connecting the DC1613 USB to I2C/SMBus/PMBus Controller to

the LTC2971 in System.............................................................. 106

Accurate DCR Temperature Compensation......................................107

LTpowerPlay: An Interactive GUI for Power Managers ................... 109

PCB Assembly and Layout Suggestions ......................................... 109

Bypass Capacitor Placement ..................................................... 109

PCB Board Layout...................................................................... 109

Unused ADC Sense Inputs..........................................................111

Design Checklist ...............................................................................111

ABSMAX ...........................................................................................111

I2C ...............................................................................................111

Output Enables............................................................................111

External Temperature Sense.......................................................111

Logic Signals...............................................................................111

Tie VDDIO to a supply voltage between 1.5V and 3.6V................111

Unused Inputs.............................................................................111

DAC Outputs................................................................................111

Typical Application ............................................................112

Package Description ..........................................................113

Typical Application ............................................................114

Related Parts ...................................................................114

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