LTC2978CUP View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC2978CUP

Octal PMBus Power Supply Monitor and Controller with EEPROM

Linear Technology 

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LTC2978

PMBus Command Description

MFR_PADS

The MFR_PADS command provides read only access to slow frequency digital pads. The input values presented in

bits[9:0] are before any deglitching logic.

MFR_PADS Data Contents

BIT(S) SYMBOL

OPERATION

b[15] Mfr_pads_pwrgd_drive 0 = PWRGD pad is being driven low by this chip

1 = PWRGD pad is not being driven low by this chip

b[14] Mfr_pads_alertb_drive 0 = ALERTB pad is being driven low by this chip

1 = ALERTB pad is not being driven low by this chip

b[13:10] Mfr_pads_faultb_drive[3.0] Bit[3] used for FAULTB00 pad, bit[2] used for FAULTB01 pad, bit[1] used for FAULTB10 pad, bit[0] used for

FAULTB11 pad as follows:

0 = FAULTBzn pad is being driven low by this chip

1 = FAULTBzn pad is not being driven low by this chip

b[9:8] Mfr_pads_asel1[1:0]

11: Logic high detected on ASEL1 input pad

10: ASEL1 input pad is floating

01: Reserved

00: Logic low detected on ASEL1 input pad

b[7:6] Mfr_pads_asel0[1:0]

11: Logic high detected on ASEL0 input pad

10: ASEL0 input pad is floating

01: Reserved

00: Logic low detected on ASEL0 input pad

b[5] Mfr_pads_control1

1: Logic high detected on CONTROL1 pad

0: Logic low detected on CONTROL1 pad

b[4] Mfr_pads_control0

1: Logic high detected on CONTROL0 pad

0: Logic low detected on CONTROL0 pad

b[3:0] Mfr_pads_faultb[3:0]

Bit[3] used for FAULTB00 pad, bit[2] used for FAULTB01 pad, bit[1] used for FAULTB10 pad, bit[0] used for

FAULTB11 pad as follows:

1: Logic high detected on FAULTBzn pad

0: Logic low detected on FAULTBzn pad

MFR_I2C_BASE_ADDRESS

The MFR_I2C_BASE_ADDRESS command determines the base value for the I2C/SMBus address byte. Offsets of 0

to 9 are added to this base address to make the device I2C/SMBus address. The part responds to the device address.

MFR_I2C_BASE_ADDRESS Data Contents

BIT(S) SYMBOL

OPERATION

b[7] Reserved

Read only, always returns 0.

b[6:0] i2c_base_address This 7-bit value determines the base value of the 7-bit I2C/SMBus address. See Operation Section: Device Address.

MFR_SPECIAL_ID

This register contains the manufacturer ID for the LTC2978.

MFR_SPECIAL_ID Data Contents

BIT(S) SYMBOL

OPERATION

b[15:0] Mfr_special_id Read only, always returns 0x0122. Previous valid value is 0x0121.

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