JS202011SCQN datasheet(11/45 Pages) MICROCHIP

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PAC1934 EVALUATION BOARD

(ADM00805) USER’S GUIDE

 2017 Microchip Technology Inc.

DS50002673A-page 11

Chapter 1. Product Overview

1.1

INTRODUCTION

The ADM00805 Evaluation Board for PAC1934 provides a flexible platform for evalu-

ating PAC1934 and demonstrating the features of the PAC1934. A PAC1934 device in

a wafer level chip scale package (WLCSP) is mounted to the board.

The ADM00805 has a USB connector to connect to a computer for device communi-

cation. The PAC1934 device may be powered directly by VBUS from the USB connector

or by an external connection for VDD.

I2C communication can be provided over USB using the on-board MCP2221 USB to

I2C Bridge. There is also a header that facilitates direct I2C communication by connect-

ing the VDD_IO, Ground, SDA and SCL to an external source such as a PC motherboard

or a Linux system. See Section 4.9 “Direct External I2C Connection” for important

details if using direct I2C connection.

The shorting shunts and the switch on the board facilitate either simple demonstration

of the device functions using on-board current sources or detailed evaluation of

function and performance with external sources, including prototyping the system.

1.2

PAC1934 DEVICE FEATURES

The PAC1934 is a four-channel DC power/energy monitor with accumulator. There is

a16-bit ADC for monitoring power rail voltages connected by a multiplexer to the posi-

tive (+) input pin of each channel, producing results named VBUS. There is a second

16-bit ADC for measuring the voltage across a current sense resistor. This ADC is con-

nected by a differential multiplexer to the +input and –input pins for each channel, pro-

ducing results called VSENSE. Channel selection for the multiplexers is controlled in

sequential fashion to scan all four channels up to 1024 samples per second (sps).

The device also computes VPOWER by multiplying VBUS by VSENSE and accumulates

these power results in an Accumulator. The device registers also hold eight times aver-

aged VBUS and VSENSE results for very accurate low noise voltage and current mea-

surements. All the results are stored in registers. The values in the Results Registers

only change when a REFRESH or a REFRESH_V command is sent. Software applica-

tions are available for plotting, displaying and logging data. These applications also

calculate energy based on the accumulated power and accumulation time.

1.3

ADM00805 EVALUATION BOARD FOR PAC1934

1.3.1

Hardware Overview

The ADM00805 Evaluation Board has a PAC1934 device mounted on the board and

enables direct control of all device pins and easy measurements of on-board or exter-

nal voltages and currents. The I2C address is connected as 0x20 by default. Removing

a shunt gives 0x22. Other addresses are possible by replacing R22 with a new value.

Sampling rate is 1024 sps by default, due to the shorting shunt on the SLOW pin con-

nector (J23) tying the SLOW pin to ground. Remove this shunt for the SLOW sampling

rate of 8 sps.

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