Table 7-4. Configuration Register Field Descriptions (continued)

Bit

Field

Type

Reset

Description

8-6

VBUSCT

R/W

100b

Sets the conversion time of the VBUS measurement

000b = 140 µs

001b = 204 µs

010b = 332 µs

011b = 588 µs

100b = 1100 µs

101b = 2116 µs

110b = 4156 µs

111b = 8244 µs

5-3

VSHCT

R/W

100b

Sets the conversion time of the SHUNT measurement

000b = 140 µs

001b = 204 µs

010b = 332 µs

011b = 588 µs

100b = 1100 µs

101b = 2116 µs

110b = 4156 µs

111b = 8244 µs

2-0

MODE

R/W

111b

Operating mode, modes can be selected to operate the device either in

Shutdown mode, continuous mode or triggered mode.

The mode also allows user to select mux settings to set continuous or

triggered mode on bus voltage, shunt voltage measurement.

000b = Shutdown

001b = Shunt Voltage triggered, single shot

010b = Bus Voltage triggered, single shot

011b = Shunt voltage and Bus voltage triggered, single shot

100b = Shutdown

101b = Continuous Shunt voltage

110b = Continuous Bus voltage

111b = Continuous Shunt and Bus voltage

Return to the Summary Table.

7.6.1.2 Shunt Voltage Register (Address = 1h) [reset = 0000h]

The Shunt Voltage Register stores the current shunt voltage reading, VSHUNT and is show in Table 7-5. Negative

numbers are represented in two's complement format. Generate the two's complement of a negative number by

complementing the absolute value binary number and adding 1. An MSB = '1' denotes a negative number.

Example: For a value of VSHUNT = –80 mV:

1. Take the absolute value: 80 mV

2. Translate this number to a whole decimal number (80 mV ÷ 2.5 µV) = 32000

3. Convert this number to binary = 0111 1101 0000 0000

4. Complement the binary result = 1000 0010 1111 1111

5. Add '1' to the complement to create the two's complement result = 1000 0011 0000 0000 = 8300h

If averaging is enabled, this register displays the averaged value.

Table 7-5. Shunt Voltage Register Field Descriptions

Bit

Field

Type

Reset

Description

15-0

VSHUNT

R

0000h

Differential voltage measured across the shunt output. Two's

complement value.

Return to the Summary Table.

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SBOSAA2 – DECEMBER 2022

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