EMC1702 datasheet(49/60 Pages) MICROCHIP

49 / 60 page

EMC1702



2020 Microchip Technology Inc.

DS20006455A

5.22 Sense Voltage Registers

The Sense Voltage registers store the measured VSENSE voltage across the sense resistor (RSENSE)

placed between the SENSE+ and SENSE- pins (see Section 4.1.1, "Current Measurement"). Note that

the bit weighting values are for representation of the voltage relative to full scale. There is no internal

scaling of data and all normal binary bit weightings still apply.

The Sense Voltage register data format is standard 2’s complement format with the positive full scale

value (7F_Fh) and negative full scale value (80_0h) equal to the programmed maximum sense voltage

(see Section 5.20, "Current Sense Sampling Configuration Register").

The Sign bit indicates the direction of current flow. If the Sign bit is ‘0’, current is flowing through

RSENSE from the SENSE+ pin to the SENSE- pin. If the Sign bit is ‘1’, the current is flowing through

RSENSE from the SENSE- pin to the SENSE+ pin. See Section 4.1.1, "Current Measurement" for

examples.

5.23 Source Voltage Registers

Table 5.36 Sense Voltage Registers

ADDR

R/W

DEFAULT

54h

Sense Voltage

High Byte

Sign

1024

512

256

128

00h

55h

Sense Voltage

Low Byte

00h

Table 5.37 VSENSE Data Format

VSENSE

BINARY

HEX (AS READ BY REGISTERS)

Minus Full Scale

1000_0000_0000

80_0h

-2 LSB

1111_1111_1110

FF_Eh

-1 LSB

1111_1111_1111

FF_Fh

Zero

0000_0000_0000

00_0h

+1 LSB

0000_0000_0001

00_1h

+2 LSB

0000_0000_0010

00_2h

Plus Full Scale

0111_1111_1111

7F_Fh

Table 5.38 Source Voltage Registers

ADDR

R/W

DEFAULT

58h

VSOURCE

High Byte

1.5

0.75

0.375

0.1875

0.0938

00h

59h

VSOURCE

low Byte

0.0469

0.0234

0.0117

00h

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