LTC2972 datasheet(41/112 Pages) LINER

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LTC2972

2972fa

For more information www.linear.com/LTC2972

Figure 15. Cascade Sequence ON with Time Based Sequence Down on FAULT0

The waveform of Figure 15 illustrates cascade sequence ON and time based sequence OFF using the configuration

illustrated in Figure 14. In this example the FAULTB0 pin is used as a broadcast off signal. Turning the system off with

the FAULTB0 requires all slave channels to be configured with Mfr_faultb0_response_chann asserted high. After the

system is turned off, the LTC2972 will assert ALERTB with all slave channels indicating a Status_mfr_fault0_in event.

MFR_CONFIG2_LTC2972

This command register determines whether VOUT overvoltage faults from a given channel cause the AUXFAULTB pin

to be pulled low.

PMBus COMMAND DESCRIPTION

2972 F15

POWERGOOD1

POWERGOOD0

CONTROL– FAULTB0

VOUT1

VOUT0

TOFF_DELAY1

TOFF_DELAY0

MFR_CONFIG2_LTC2972 Data Contents

BIT(S) SYMBOL

OPERATION

b[1] Mfr_auxfaultb_ov_fault_response_

chan1

Response to channel 1 VOUT_OV_FAULT.

1 = Pull AUXFAULTB low via fast pull-down.

0 = Do not pull AUXFAULTB low.

b[0] Mfr_auxfaultb_ov_fault_response_

chan0

Response to channel 0 VOUT_OV_FAULT.

1 = Pull AUXFAULTB low via fast pull-down.

0 = Do not pull AUXFAULTB low.

MFR_CONFIG3_LTC2972

This command register determines whether VOUT undervoltage faults from a given channel cause the AUXFAULTB pin

to be pulled low.

MFR_CONFIG3_LTC2972 Data Contents

BIT(S) SYMBOL

OPERATION

b[1] Mfr_auxfaultb_uv_fault_response_chan1

Response to channel 1 VOUT_UV_FAULT.

1 = Pull AUXFAULTB low via fast pull-down.

0 = Do not pull AUXFAULTB low.

b[0] Mfr_auxfaultb_uv_fault_response_chan0

Response to channel 0 VOUT_UV_FAULT.

1 = Pull AUXFAULTB low via fast pull-down.

0 = Do not pull AUXFAULTB low.

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