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[原创] Microchip PAC1934四路DC电源监视器解决方案

关键词:电源管理 电源监视器 笔记本电脑 汽车电子 云计算 工业控制

时间:2018-05-03 10:31:54       作者:Microchip       来源:中电网

Microchip公司的PAC1934是带有累加器的四路DC电源/能量监视器,具有总线电压监视器和电流检测放大器,数字电路进行功率计算和能量累加.工作电压 2.7V - 5.5V,监测周期从1ms到36小时或更长,总线电压,检测电阻电压和累加比例功率存储在寄存器,功率测量精度1%,主要应用在笔记本和平板计算,网络,汽车,云计算,Linux和服务器计算,工业和Linux应用.本文介绍了PAC1934主要特性,框图和系统框图,功能框图以及四路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 PAC1934 device is a four-channel energy monitor, with bus voltage monitor and current sense amplifiers that feed high-resolution ADCs. Digital circuitry performs power calculations and energy accumulation.

This enables energy monitoring with integration periods from 1 ms up to 36 hours or longer. Bus voltage, sense resistor voltage and accumulated proportional power are stored in registers for retrieval by the system master or Embedded Controller.

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

The PAC1934 uses real time calibration to minimize offset and gain errors. No input filters are required for this device.

PAC1934主要特性:

• High-Side Current Monitor
- 100 mV full scale range for current sense voltage,16b resolution default setting
- Selectable bidirectional current sense capability,
–100 mV to +100 mV range, 16-bit two’s complement (signed) data format
- External sense resistor sets full scale current range
- 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, 14b are used for power calculations
• Real Time Auto-Calibration of Offset and Gain Errors for Voltage and Current, No User Adjustment Required
• 1% Power Measurement Accuracy over a Wide Dynamic Range
• On-Chip Accumulation of 28-bit Power Results for Energy Measurement
- 48-bit power accumulator register for recording 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 accumulation minimum at 1024 S/s
- >36 hours of power data accumulation minimum 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
• 2.225 x 2.17 mm WLCSP Package

PAC1934应用:

• Notebook and Tablet Computing
• Networking
• Automotive
• Cloud, Linux and Server Computing
• Industrial
• Linux Applications

图1. PAC1934框图

图2. PAC1934系统框图

图3. PAC1934功能框图

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 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 communication.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 connecting the VDD_IO, Ground, SDA and SCL to an external source such as a PC motherboard or a Linux system.

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.

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. 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 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 direct I2C connection.

This board enables easy connection of the PAC1934 to power sources and loads for power monitoring and energy metering. On-board current sense resistors for high side current sensing. It has USB connection to PC for power and data, or you may use I2C direct connection to your digital controller. On board square wave current generator for demo purposes. GUI available, detailed User ’s Guide.


图4. 评估板ADM00805外形图

评估板ADM00805主要特性:

USB or I2C direct connection
Easy connection to power sources and loads
Onboard sense resistors and current square wave generator.
评估板ADM00805包括:
• The ADM00805 Evaluation Board (EVB)
• USB cable
• Important Information Sheet

图5. 评估板ADM00805电路图(1)

图6. 评估板ADM00805电路图(2)

图7. 评估板ADM00805电路图(3)
评估板ADM00805材料清单:



图8. 评估板ADM00805 PCB设计图(1):顶层丝印


图9. 评估板ADM00805 PCB设计图(2):顶层铜和丝印

图10. 评估板ADM00805 PCB设计图(3):顶层铜

图11. 评估板ADM00805 PCB设计图(4):底层铜

图12. 评估板ADM00805 PCB设计图(5):底层铜和丝印

图13. 评估板ADM00805 PCB设计图(6):底层丝印
详情请见:
http://ww1.microchip.com/downloads/en/DeviceDoc/20005850B.pdf
http://ww1.microchip.com/downloads/en/DeviceDoc/50002673A.pdf
以及http://ww1.microchip.com/downloads/en/DeviceDoc/03-10617-R2.PDF
http://ww1.microchip.com/downloads/en/DeviceDoc/02-10617-R2_BOM_Web.pdf
20005850B.pdf
50002673A.pdf
03-10617-R2.PDF
02-10617-R2_BOM_Web.pdf

 

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