PAC1941T-1ESLASH4MX. datasheet(26/96 Pages) MICROCHIP

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PAC194X

DS20006543A-page 26

 2021 Microchip Technology Inc.

EQUATION 5-4:

SENSE CURRENT

5.11

FSR/2 RANGES

The PAC194X has a mode called FSR/2. In this mode,

the FSR may be reduced by a factor of two for VSENSE

and/or VBUS. This mode is programmable on a chan-

nel by channel basis, for VSENSE and/or VBUS for each

channel. Because of the way the ADC’s 17-bit bipolar

results are manipulated, in Bipolar/Bidirectional

modes, the 16-bit resolution is maintained in FSR/2

and the graphs provided are valid for this mode.

The modes can be enabled for VSENSE and/or VBUS by

setting bits in Register 7-19.

ISENSE FSC

VSENSE

Denominator

-----------------------------------



Where:

ISENSE = Actual bus current

FSC = Full-Scale Current value (from

Equation 5-3)

VSENSE = The value read from the

VSENSE results registers

Denominator =216 for unipolar measurements

=216 for FSR/2 measurements

=215 for bipolar measurements

TABLE 5-1:

FSR/2 RANGES – VBUS

VBUS Range

PAC194X, FSR = 9V, FSR/2 = 4.5V

Denominator for Equation 5-1

Unipolar 0-FSR

0.137 mV/LSB

216

Bipolar +/-FSR

0.2745 mV/LSB

215

Bipolar +/- FSR/2

0.137 mV/LSB

216

TABLE 5-2:

FSR/2 RANGES – VSENSE

VSENSE Range

PAC194X, FSR = 100 mV,

FSR/2 = 50 mV

Denominator for Equation 5-4

Unipolar 0-FSR

1.5 µV/LSB

216

Bipolar +/-FSR

3.05 µV/LSB

215

Bipolar +/- FSR/2

1.5 µV/LSB

216

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