Microchip's PAC1934 is a Quad DC Power/Energy Monitor with Accumulator with Bus Voltage Monitor and Current Sense Amplifier, Direct Input to High Resolution ADC, Digital Current for Power Calculation and Energy Accumulation. Monitoring Period from 1ms to 36 hours or more. Power measurement accuracy 1%, 24-bit accumulator count, 2.7-5.5V operating voltage, mainly used in notebooks and tablets, network equipment, automotive electronics, cloud, Linux and server computing, and industrial and Linux Applications. This article describes the main features of the PAC1934, block diagrams, system block diagrams and functional block diagrams, as well as the main features of the PAC1934 evaluation board ADM00805, circuit diagrams, bill of materials, and PCB design drawings. Position Selector Switch,Rotary Selector Switch,Pole Rotary Switches,Ceramic Rotary Switch Foshan City Jiulong Machine Co., Ltd , https://www.jlthermostat.com
The PAC1934 device is a four-channel energy monitor, with bus voltage monitor and current sense amplifiers that feed high-resoluTIon ADCs. Digital outputs performing calculaTIons and energy accumulaTIon.
This enables energy monitoring with integraTIon periods from 1 ms up to 36 hours or longer. Bus voltage, senseresistor voltage and stored proportional power arestored 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 main features:
• High-Side Current Monitor
- 100 mV full scale range for current sensevoltage,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 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,14b are used for power calculations
• Real Time Auto-Calibration of Offset and GainErrors for Voltage and Current, No User AdjustmentRequired
• 1% Power Measurement Accuracy over a WideDynamic Range
• On-Chip Accumulation of 28-bit Power Results for Energy Measurement
- 48-bit power accumulator register for recordingaccumulated 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 minimumat 1024 S/s
- >36 hours of power data accumulation minimumat 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 store overflow
- ALERT on Conversion Complete
• 2.225 x 2.17 mm WLCSP Package
PAC1934 Application:
• Notebook and Tablet Computing
• Networking
• Automotive
• Cloud, Linux and Server Computing
• Industrial
• Linux Applications 
Figure 1. PAC1934 block diagram 
Figure 2. PAC1934 System Block Diagram 
Figure 3. Functional block diagram of the PAC1934