PAC1934 click

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  • MIKROE-2735
  • MIKROE-2735
PAC1934 click  carries the  PAC1934  four channel DC power/energy monitor... more
Product information "PAC1934 click"

PAC1934 click carries the PAC1934 four channel DC power/energy monitor from Microchip. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over an I2C interface.

How the click works

There are four 4-Terminal current sense shunt resistors connected to the current sense amplifier (in the chip). Electricity is brought to shunts via screw terminals. Middle screw connector is GND which can be used for bus voltage monitoring.

This click 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.

PAC1934 energy monitor features

The PAC1934 is a four channel bi-directional high-side current-sensing device with precision voltage measurement capabilities, DSP for power calculation, and a power accumulator. It measures the voltage developed across an external sense resistor (VSENSE) to represent the high-side current of a battery or voltage regulator. The PAC1932/3/4 also measures the SENSE1+ pin voltages (VBUS).


Type Measurements
Applications Power management systems, embedded applications, servers, personal computers, etc.
On-board modules PAC1934 four channel energy monitor from Microchip
Key Features 1% power measurement accuracy over a wide dynamic range, alert feature on accumulator overflow and conversion complete, that could be enabled
Interface I2C
Input Voltage 3.3V or 5V
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on PAC1934 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
  NC 1 AN PWM 16 NC  
Reset RST 2 RST INT 15 ALE Alert pin
  NC 3 CS TX 14 NC  
  NC 4 SCK RX 13 NC  
  NC 5 MISO SCL 12 SCL I2C clock
  NC 6 MOSI SDA 11 SDA I2C data
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
JP1 PWR.SEL. Left 3V3 Power Supply Voltage Selection 3V3/5V, left position 3V3, right position 5V
JP2 ADDR.SEL. Left 20h I2C Address select - Left position 20h, Right position 3Eh

LEDs, Buttons, Switches, Connectors, etc. 

DesignatorNameType (LED, BUTTON...)  Description
LD1 PWR LED Power indication LED


Code examples for PAC1934 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows how to measure Current, Voltage, Power and Energy using the PAC1934 library.

01 char txt [30];
02     float readValue;
03     PAC1934_sendCommand (_PAC1934_REFRESH_CMD);
04     delay_ms (200);
06    readValue = PAC1934_measureVoltage(4);
07     FloatToStr(readValue, txt);
08     LOG ("VBUS 4:      ");
09     LOG (txt);
10     LOG (" Vrn");
12    readValue = PAC1934_measureCurrent(4);
13     FloatToStr(readValue, txt);
14     LOG ("Current 4:   ");
15     LOG (txt);
16     LOG (" mArn");
18    readValue = PAC1934_measurePower(4);
19     FloatToStr(readValue, txt);
20     LOG ("Power 4:     ");
21     LOG (txt);
22     LOG (" Wrn");
24    readValue = PAC1934_measureEnergy(4, 8);
25     FloatToStr(readValue, txt);
26     LOG ("Energy 4:    ");
27     LOG (txt);
28     LOG (" Jrn");
30    LOG ("____________________rn");
31     delay_ms (10000);


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