PAC1721 datasheet(75/92 Pages) MICROCHIP

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DS-20007088A-page 75

PAC1721

STEP_LIMIT (ADDRESS 22H)

R/W-0

RV[1:0]

FV[1:0]

RC[1:0]

FC[1:0]

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as 0

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

X = Bit is unknown

This register detects changes in the voltage or current average value. The value that is currently stored in the

VBUS_AVG or VSENSE_AVG register is compared to the previously stored value.

This average value is programmable.

Note 1: The STEP_LIMIT register uses VBUS_AVG and VSENSE_AVG data. These two registers use full signed

values for ADC data regardless of the settings in the NEG_PWR_FSR register. This can results in an

unexpected step limit excursion.

2: Disable alerts in the ALERT_ENABLE register before making changes to the STEP_LIMIT register to

avoid false triggers.

bit 7:6

RV[1:0]: Configure Rising Voltage limit.

When VBUS increases, the new average value is checked to determine if the voltage increase is greater

than the previous average stored in the VBUS_AVG register by a certain percent.

00b = 25% (default)

01b = 50%

10b = 75%

11b = 100%

bit 5:4

FV[1:0]: Configure Falling Voltage limit.

When VBUS decreases, the new average value is checked to determine if the voltage decrease is lesser

than the previous average stored in the VBUS_AVG register by a certain percent.

00b = 25% (default)

01b = 50%

10b = 75%

11b = 100%

bit 3:2

RC[1:0]: Configure Rising Current limit.

When VSENSE increases, the new average value is checked to determine if the voltage increase is

greater than the previous average stored in the VSENSE_AVG register by a certain percent.

00b = 25% (default)

01b = 50%

10b = 75%

11b = 100%

bit 1:0

FC[1:0]: Configure Falling Current limit.

When VSENSE decreases, the new average value is checked to determine if the voltage decrease is

lesser than the previous average stored in the VSENSE_AVG register by a certain percent.

00b = 25% (default)

01b = 50%

10b = 75%

11b = 100%

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