LTC2972 datasheet(73/112 Pages) LINER

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LTC2972

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For more information www.linear.com/LTC2972

MFR_PADS Data Contents

BIT(S) SYMBOL

OPERATION

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[3:2] Mfr_pads_faultb[1:0]

bit[1] used for FAULTB0 pad, bit[0] used for FAULTB1 pad as follows:

1: Logic high detected on FAULTB pad.

0: Logic low detected on FAULTB pad.

b[1]

Mfr_pads_pg1

1: Logic high detected on PG1 pad.

0: Logic low detected on PG1 pad.

b[0]

Mfr_pads_pg0

1: Logic high detected on PG0 pad.

0: Logic low detected on PG0 pad.

MFR_COMMON

This command returns status information for the alert, device busy, share-clock pin (SHARE_CLK) and the write-protect

pin (WP).

This is the only command that may still be read when the LTC2972 is busy processing an EEPROM or other command.

It may be polled by the host to determine when the LTC2972 is available to process a PMBus command. A busy device

will always acknowledge its address but will NACK the command byte and set Status_byte_busy and Status_word_busy

when it receives a command that it cannot immediately process.

MFR_COMMON Data Contents

BIT(S) SYMBOL

OPERATION

b[7] Mfr_common_alertb

Returns alert status.

1: ALERTB is de-asserted high.

0: ALERTB is asserted low.

b[6] Mfr_common_busyb

Returns device busy status.

1: The device is available to process PMBus commands.

0: The device is busy and will NACK PMBus commands.

b[5:2] Reserved

Read only, always returns 1s.

b[1] Mfr_common_share_clk

Returns the status of the share-clock pin.

1: Share-clock pin is being held low.

0: Share-clock pin is active.

b[0] Mfr_common_write_protect Returns the status of the write-protect pin.

1: Write-protect pin is high.

0: Write-protect pin is low.

PMBus COMMAND DESCRIPTION

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