PAC1934 datasheet(16/64 Pages) MICROCHIP

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PAC1931/2/3/4

DS20005850E-page 16

 2017-2019 Microchip Technology Inc.

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. PAC1931, PAC1932 and

PAC1933 are one, 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 PAC1931/2/3/4 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 PAC1931/2/3/4 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:

PAC1931/2/3/4 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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