LTC2978C View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC2978C

Octal PMBus Power Supply Monitor and Controller with EEPROM

Linear Technology 

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LTC2978

PMBus Command Description

MFR_CONFIG_LTC2978 Data Contents

BIT(S) SYMBOL

OPERATION

b[0] Mfr_config_dac_pol

DAC output polarity.

0: Encodes negative (inverting) DC/DC converter trim input.

1: Encodes positive (noninverting) DC/DC converter trim input.

MFR_CONFIG_ALL_LTC2978

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

from any PAGE setting.

MFR_CONFIG_ALL_LTC2978 Data Contents

BIT(S)

b[7]

b[6]

b[5]

b[4]

b[3]

b[2]

b[1]

b[0]

SYMBOL

Mfr_config_all_fault_log_enable

Mfr_config_all_vin_on_clr_

faults_en

Mfr_config_all_control1_pol

Mfr_config_all_control0_pol

Mfr_config_all_vin_share_

enable

Mfr_config_all_pec_en

Mfr_config_all_longer_pmbus_

timeout

Mfr_config_all_vinen_wpu_dis

OPERATION

Enable fault logging to EEPROM in response to Fault.

0: Fault logging to EEPROM is disabled

1: Fault logging to EEPROM is enabled

Allow VIN rising above VIN_ON to clear all latched faults

0: VIN_ON clear faults feature is disabled

1: VIN_ON clear faults feature is enabled

Selects active polarity of CONTROL1 pin.

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

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

Selects active polarity of CONTROL0 pin.

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

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

Allow this unit to hold SHARE_CLK pin low when VIN has not risen above VIN_ON or has fallen below VIN_

OFF. When enabled, this unit will also turn all channels off in response to share-clock being held low.

0: SHARE_CLK inhibit is disabled

1: SHARE_CLK inhibit is enabled

PMBus packet error checking enable.

0: PEC is accepted but not required

1: PEC is required

Increase PMBus timeout internal 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

VIN_EN charge-pumped, current-limited pull-up disable.

0: Use weak current-limited pull-up on VIN_EN after power-up, as long as no faults have forced VIN_EN off.

1: Disable weak pull-up. VIN_EN driver is three-stated after power-up as long as no faults have forced VIN_EN

off.

For more information www.linear.com/LTC2978

2978fd

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