LTC2972 datasheet(44/112 Pages) LINER

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LTC2972

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MFR_CONFIG_ALL_LTC2972

This command is used to configure parameters that are common to both channels on the IC. They may be set or

reviewed from any PAGE setting.

MFR_CONFIG_ALL_LTC2972 Data Contents

BIT(S) SYMBOL

OPERATION

b[15:13] Reserved

Don’t care. Always returns 0.

b[12]

Mfr_config_all_en_short_cycle_fault

Enable short cycle fault detection. See Mfr_status_2_short_cycle_fault on page 74 for more

information.

0: Issuing an ON before prior OFF is complete will not cause a fault.

1: Issuing an ON before prior OFF is complete will cause a fault.

b[11]

Mfr_config_all_pwrgd_off_uses_uv

Selects PWRGD de-assertion source for both channels.

0: PWRGD is de-asserted based on VOUT being below or equal to POWER_GOOD_OFF. This option

uses the ADC. Response time is approximately 100ms to 200ms.

1: PWRGD is de-asserted based on VOUT being below or equal to VOUT_UV_LIMIT. This option uses

the high speed supervisor. Response time is approximately 12µs.

b[10]

Reserved

Don’t care.

b[9]

Reserved

Don’t care. Always returns 0.

b[8]

Reserved

Don’t care. Always returns 0.

b[7]

Mfr_config_all_fault_log_enable

Enable fault logging to EEPROM in response to Fault.

0: Fault logging to EEPROM is disabled.

1: Fault logging to EEPROM is enabled.

b[6]

Mfr_config_all_vin_on_clr_faults_en

Allow VIN_ON rising edge to clear all latched faults.

0: VIN_ON clear faults feature is disabled.

1: VIN_ON clear faults feature is enabled.

b[5]

Mfr_config_all_control1_pol

Selects active polarity of CONTROL1 pin

0: Active low (pull pin low to start unit).

1: Active high (pull pin high to start unit).

b[4]

Mfr_config_all_control0_pol

Selects active polarity of CONTROL0 pin

0: Active low (pull pin low to start unit).

1: Active high (pull pin high to start unit).

b[3]

Mfr_config_all_vin_share_enable

Allow this unit to hold Share-clock pin low when VIN has not risen above VIN_ON or has fallen below

VIN_OFF. When enabled this unit will also turn both channels off in response to Share-clock being

held low.

0: Share-clock inhibit is disabled.

1: Share-clock inhibit is enabled.

b[2]

Mfr_config_all_pec_en

PMBus packet error checking enable.

0: PEC is accepted but not required.

1: PEC is enabled.

b[1]

Mfr_config_all_longer_pmbus_timeout Increase PMBus timeout interval by a factor of 8. Recommended for fault logging.

0: PMBus timeout is not multiplied by a factor of 8.

1: PMBus timeout is multiplied by a factor of 8.

b[0]

Reserved

Always set to 1.

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 44 Page - Linear Technology

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