PAC1933T-ISLASHJQ. datasheet(17/62 Pages) MICROCHIP

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DS20005850C-page 17

PAC1932/3/4

4.0

GENERAL DESCRIPTION

The PAC1934 is a four-channel, bidirectional, high-side

current-sensing

device

with

precision

voltage

measurement capabilities, DSP for power calculation

and a power accumulator. PAC1932 and PAC1933 are

two and three channel versions of the PAC1934. These

devices measure the voltage developed across an

external sense resistor (VSENSE) to represent the

high-side current of a battery or voltage regulator. The

PAC1932/3/4 also measures the SENSE+ pin voltages

(VBUS). Both VBUS and VSENSE are converted to digital

results by a 16-bit ADC, and the digital results are

multiplied to give VPOWER. The VPOWER results are

accumulated

on-chip,

which

enables

energy

measurement over the accumulation period.

The PAC1932/3/4 has an I2C/SMBus interface for

digital control and reading results. It also has digital

supply reference VDD I/O that is to be connected to the

same supply as the digital master for the I2C/SMBUS,

enabling digital I/O voltages as low as 1.62V.

A system diagram is shown in Figure 4-1.

FIGURE 4-1:

PAC1932/3/4 System Diagram.

Note:

VDD and VDD I/O may be connected together.

PAC1934

System

Master

SM_DATA

SM_CLK

VSOURCE 0V – 32V

Sense

Resistors

VDD

1.62V to 5.5V

Digital Supply

GND

2.7V to 5.5V

VSOURCE 0V – 32V

Load

SLOW

PWRDN

ADDRSEL

VDD I/O

PAC193X

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