原标题：Microchip PAC1934四路电源和能源监视解决方案

　　Microchip公司的PAC1932/3/4是两/三/四路电源和能源监视器,高压复接器依此连接输入到总线电压监视器和电流检测放大器, 进而连接高分辨率ADC,数字电路进行功率计算和能量计算,宽动态范围内功率测量精度1%,能量测量采用28位功率结果片上累加,而48位功率累加寄存器用来记录在累加功率数据,用户可编程取样速率8,64,256和1024取养/秒,工作电压2.7V-5.5V,主要用在嵌入计算,网络,FPGA系统,汽车电子,低压/大功率-AI,GPU以及工业和Linux应用,笔记本和平板电脑,云,Linux和服务器计算.本文介绍了PAC1932/3/4主要特性,框图,以及PAC1934四路DC电源监视器评估板ADM00805主要特性,电路图,材料清单和PCB设计图.

　　The PAC1932/3/4 are two, three and four-channelpower and energy monitoring devices. A high-voltagemultiplexer sequentially connects the inputs to a busvoltage monitor and current sense amplifier that feedhigh-resolution ADCs. Digital circuitry performs power calculations and energy accumulation.

　　This enables energy monitoring with integrationperiods from 1 ms up to 36 hours or longer. Busvoltage, sense resistor voltage and accumulatedproportional power are stored in registers for retrievalby the system master or Embedded Controller.

　　The sampling rate and energy integration period can becontrolled over SMBus or I2C. Active channel selection,one-shot measurements and other controls are alsoconfigurable by SMBus or I2C.

　　The PAC1932/3/4 device family uses real timecalibration to minimize offset and gain errors. No inputfilters are required for this device.

　　PAC1932/3/4主要特性:

　　• High-Side Current Monitor with 2, 3 or 4 Channels

　　- 100 mV full scale range for current sensevoltage,16 bit resolution

　　- Selectable bidirectional current sensecapability, -100 mV to +100 mV range, 16 bittwo’s complement (signed) data format

　　- External sense resistor sets full scale currentrange

　　- Very low input current simplifies routing

　　• Wide Bus Voltage Range for Voltage Monitor

　　- 0V to 32V input common-mode voltage

　　- 16 bit resolution for voltage measurements,14 bits are used for power calculations

　　• Real Time Auto-Calibration of Offset and GainErrors for Voltage and Current, No User Adjustment Required

　　• 1% Power Measurement Accuracy over a WideDynamic Range

　　• On-Chip Accumulation of 28-bit Power Results forEnergy Measurement

　　- 48-bit power accumulator register forrecording accumulated power data

　　- 24 bit Accumulator Count

　　- User programmable sampling rates of 8, 64,256 and 1024 samples per second

　　- 17 minutes of power data accumulationminimum at 1024 S/s

　　- Over 36 hours of power data accumulationminimum at 8 S/s

　　• 2.7V to 5.5V Supply Operation

　　- Separate VDD I/O pin for digital I/O

　　- 1.62-5.5V capable SMBus and digital I/O

　　- SMBus 3.0 and I2C Fast Mode Plus (1Mb/S)

　　• SMBus Address–16 Options, set with Resistor

　　• No Input Filters Required

　　• ALERT Features that can be Enabled:

　　- ALERT on accumulator overflow

　　- ALERT on Conversion Complete

　　• 4x4x0.5 mm UQFN Package

　　• 2.225x2.17 mm WLCSP Package

　　- WLCSP available for PAC1934 only

　　- Contact Marketing for other options

　　PAC1932/3/4应用:

　　• Embedded Computing

　　• Networking

　　• FPGA Systems

　　• Automotive

　　• Low voltage/High Power – AI, GPU

　　• Industrial

　　• Linux Applications

　　• Notebook and Tablet Computing

　　• Cloud, Linux and Server Computing

　　Computing Platform Support

　　• Windows® 10 Driver

　　• Linux Driver

　　• Python Script

　　图1.PAC1932/3/4功能框图

　　图2.PAC1932/3/4系统框图

　　PAC1934四路DC电源监视器评估板ADM00805

　　The ADM00805 Evaluation Board for PAC1934 provides a flexible platform for evaluating PAC1934 and demonstrating the features of the PAC1934. A PAC1934 device ina wafer level chip scale package (WLCSP) is mounted to the board.

　　The ADM00805 has a USB connector to connect to a computer for device communication.The PAC1934 device may be powered directly by VBUS from the USB connectoror by an external connection for VDD.

　　I2C communication can be provided over USB using the on-board MCP2221 USB toI2C Bridge. There is also a header that facilitates direct I2C communication by connectingthe VDD_IO, Ground, SDA and SCL to an external source such as a PC motherboardor a Linux system.

　　The shorting shunts and the switch on the board facilitate either simple demonstrationof the device functions using on-board current sources or detailed evaluation offunction and performance with external sources, including prototyping the system.

　　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 external voltages and currents. The I2C address is connected as 0x20 by default. Removinga 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 connector(J23) tying the SLOW pin to ground. Remove this shunt for the SLOW sampling rate of 8 sps.

　　An on-board current source provides a 0.5 Hz square wave current signal for functionality testing and demo purposes. There are also on-board current sense resistors, provisions for external sources and loads, and provisions for both USB control and directI2C connection.

　　The PAC1934 Evaluation Board Kit contains:

　　• The ADM00805 Evaluation Board (EVB)

　　• USB cable

　　• Important Information Sheet

　　图3.评估板ADM00805外形图

　　评估板ADM00805材料清单: