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LTC2972

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MFR_CONFIG_LTC2972 Data Contents

BIT(S) SYMBOL

OPERATION

b[15]

Mfr_config_track_en

Select if channel is a slave in a tracked power supply system.

0: Channel is not a slave in a tracked power supply system.

1: Channel is a slave in a tracked power supply system. Setting this bit disables UV detection during

TOFF_DELAY.

b[14]

Mfr_config_cascade_on

Configures channel’s control pin for cascade sequence ON. There is no provision for cascade sequence

OFF. See description for time based sequence OFF options.

b[13:12] Mfr_config_controln_sel

Selects the active control pin input (CONTROL0 , CONTROL1) for this channel.

00: Select CONTROL0 pin.

01: Select CONTROL1 pin.

10: Reserved.

11: Reserved.

b[11]

Mfr_config_fast_servo_off

Disables fast servo when margining or trimming output voltages:

0: fast-servo enabled.

1: fast-servo disabled.

b[10]

Mfr_config_supervisor_resolution Selects voltage supervisor resolution:

0: high resolution = 4mV/LSB, range for VVSENSEPn – VVSENSEMn is 0 to 3.8V

1: low resolution = 8mV/LSB, range for VVSENSEPn – VVSENSEMn is 0 to 6.0V

b[9]

Reserved

Always returns 0.

b[8]

Mfr_config_imon_sel

Select input range of Current Sense Channel:

0: DCR Sense telemetry mode, Range for VISENSEPn – VISENSEMn is –170mV to +170mV

1: Buffered IMON telemetry mode, Range for VISENSEPn – VISENSEMn is –0.1V to 6.0V

b[7]

Mfr_config_servo_continuous

Select whether the UNIT should continuously servo VOUT after it has reached a new margin or nominal

target. Only applies when Mfr_config_dac_mode = 00b.

0: Do not continuously servo VOUT after reaching initial target.

1: Continuously servo VOUT to target.

b[6]

Mfr_config_servo_on_warn

Control re-servo on warning feature. Only applies when Mfr_config_dac_mode = 00b and Mfr_config_

servo_continuous = 0.

0: Do not allow the unit to re-servo when a VOUT warning threshold is met or exceeded.

1: Allow the unit to re-servo VOUT to nominal target if

VOUT ≥ V(Vout_ov_warn_limit) or

VOUT ≤ V(Vout_uv_warn_limit).

b[5:4] Mfr_config_dac_mode

Determines how DAC is used when channel is in the ON state and TON_RISE has elapsed.

00: Soft-connect (if needed) and servo to target.

01: DAC not connected.

10: DAC connected immediately using value from MFR_DAC command. If this is the configuration after a

reset or RESTORE_USER_ALL, The value in MFR_DAC_STARTUP will be used to set the DAC output.

11: DAC is soft-connected. After soft-connect is complete MFR_DAC may be written.

b[3]

Reserved

Always set to 1.

b[2]

Mfr_config_vo_en_wpd_en

VOUT_EN current-limited pull-down enable.

0: Use a fast N-channel device to pull down VOUT_EN pin when the channel is off for any reason.

1: Use weak current-limited pull-down to discharge VOUT_EN pin when channel is off due to soft stop by

the CONTROL pin and/or OPERATION command. If the channel is off due to a fault, use the fast pull-down

on the VOUT_EN pin.

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 39 Page - Linear Technology

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