PAC1934 datasheet(38/64 Pages) MICROCHIP

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PAC1931/2/3/4

DS20005850E-page 38

 2017-2019 Microchip Technology Inc.

VPOWERN ACCUMULATOR REGISTERS: VPOWER1_ACC(03h),

VPOWER2_ACC (04h), VPOWER3_ACC (05h), VPOWER4_ACC (06h)

R-0R-0

VPOWERn[47:40]

bit 47

bit 40

R-0R-0

VPOWERn[39:32]

bit 39

bit 32

R-0R-0

VPOWERn[31:24]

bit 31

bit 24

R-0R-0

VPOWERn[23:16]

bit 23

bit 16

R-0R-0

VPOWERn[15:8]

bit 15

bit 8

R-0R-0

VPOWERn[7:0]

bit 7

bit 0

Legend:

R = Readable bit

W = Writeable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 47-0

VPOWERn_ACC[47:0]: contain the accumulated sum of VPOWER samples, where n = 1 to 4,

depending on device. These are 48 bit unsigned numbers unless either VBUS or VSENSE are configured

to have a bipolar range. In that case they will be 48-bit two's complement (signed) numbers.

Note that power is always calculated and accumulated using signed numbers for VBUS and VSENSE, but

if both VBUS and VSENSE are in the default unipolar mode, power is reported as an unsigned number.

This can lead to very small discrepancies between a manual comparison of the product of VBUS and

VSENSE and the results that the chip calculates and accumulates for VPOWER. The digital math in the

chip uses more bits than the reported results for VBUS and VSENSE, so the results registers for VPOWER

and Accumulated Power will in some cases have a more accurate number than calculations using the

results registers for VSENSE and VBUS will provide.

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