The PAC194x and PAC195x from Microchip are power monitors which enable manufacturers of computing, networking, and battery-powered products to embed accurate energy-monitoring and system-protection capabilities into their products.
The devices report on system bus voltage and sense voltage in 16-bit resolution. Power is reported as a simultaneous product of two independent, 16-bit bus and sense voltages. All registers are accessible through an I2C/SMBus interface, including an average of eight samples, providing a stable reading.
These power monitors can detect over-/under-voltage, over-/under-current and over-power events, monitoring against programmed limits for each channel. On detection, the device transmits an Alert output.
Each of the PAC194x and PAC195x series is available in single-, dual-, triple, and quad-channel versions. The PAC194x-1 and PAC195x-1 devices are for high-side current sensing. The PAC194x-2 and PAC195x-2 devices are for low-side current sensing.
The PAC194x products operate over a full-scale monitoring voltage range of 0 V to 9 V. The PAC195x products have a wider range of 0 V to 32 V.
Part Number: EV40S84A
This board enables easy connection of the PAC1944 to power sources and loads for power monitoring and energy metering using on board 4mOhm high side current sensing resistors. It has USB connection to PC and a GUI to display the data, as well as options to disconnect the PC and communicate directly with a different host controller. Measurement channels 1,2 and 3 are pre-populated to show demo currents and they can be switched to the external input sense resistors by moving two 0 Ohm resistors on each channel.