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PAC1941T-1E/4MX. Datasheet(PDF) 47 Page - Microchip Technology

Part # PAC1941T-1E/4MX.
Description  Single/Multi-Channel Power Monitor with Accumulator, 9V Full-Scale Range
PDF  96 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PAC1941T-1E/4MX. Datasheet(HTML) 47 Page - Microchip Technology

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 2021 Microchip Technology Inc.
DS20006543A-page 47
PAC194X
REGISTER 7-4:
VACCN (03H-06H) REGISTER
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[55:48]
bit 55
bit 48
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[47:40]
bit 47
bit 40
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[39:32]
bit 39
bit 32
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[31:24]
bit 31
bit 24
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[23:16]
bit 23
bit 16
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[15:8]
bit 15
bit 8
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
VACCn[7:0]
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
bit 55-0
VACCn[55:0]: This register contains the accumulated sum of VPOWER samples, where n = 1 to 4,
depending on the device by default. It can also hold the accumulated values of VSENSE and VBUS if
bits are set in Register 7-19. These are 56-bit unsigned numbers, unless either VBUS or VSENSE is con-
figured to have a bipolar range. In that case, they will be 55 bits + sign (two’s complement) numbers.
Power is always calculated 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 the accumulated power
will in some cases have a more accurate number than calculations using the results registers for
VSENSE and VPOWER will provide.



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