LTM2987 datasheet(41/114 Pages) AD

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LTC2971

Rev. 0

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MFR_CONFIG_LTC2971 Data Contents

BIT(S) SYMBOL

OPERATION

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 = 35.2mV/LSB, range for |VOUT_SNSn – GNDSNSn| is 0V to 34V; = 1.6mV/LSB, range for

LTC2971-3 |VOUT_SNS1 – GNDSNS1| is 0V to 1.5V

1: low resolution = 70.4mV/LSB, range for |VOUT_SNSn – GNDSNSn| is 0V to 60V; = 3.2mV/LSB, range for

LTC2971-3 |VOUT_SNS1 – GNDSNS1| is 0V to 1.8V

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 VIOUT_SNSPn – VIOUT_SNSMn is –80mV to +80mV

1: Buffered IMON telemetry mode, Range for VIOUT_SNSPn – VIOUT_SNSMn is –0.1V to +1.8V

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

LTM2987 Datasheet(PDF) 41 Page - Analog Devices

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