CS5461A enables digital power meter manufacturers to provide highly accurate, cost-effective solutions for measuring power usage. This IC is an integrated power-measurement device that combines two Delta-Sigma analog/digital converters (ADCs), high-speed power calculation functions and a serial interface on a single chip. Additional features include AC and DC calibration and phase compensation. Designed for residential single-phase or industrial three phase power-meter applications, the IC accurately measures instantaneous current and voltage while calculating instantaneous power, real power, apparent power, IRMS and VRMS.
The CS5461A is easy to design in as a pin-compatible upgrade to the popular Cirrus Logic CS5460A. It retains all the functionality of its predecessor, while also providing an on-chip temperature sensor which can be used to lower the temperature coefficient, allowing for higher accuracy over temperature. For communication with a microcontroller, the IC features a bi-directional serial interface, which is initialized and fully functional upon reset. The CS5461A can interface to a low-cost shunt resistor or transformer for current measurement and to a resistive divider or potential transformer for voltage measurement. The CS5461A delivers accurate power usage measurements and is ideal for electronic power meter applications.
- Energy data linearity: +0.1% of reading over 1000:1 dynamic range
- On-chip Functions:
- Instantaneous Voltage, Current and Power
- IRMS and VRMS, Average Real and Apparent Power
- Energy-to-pulse conversion
- Meets accuracy spec for IEC, ANSI, JIS
- Low-power consumption
- Adjustable input range on current channel
- GND-referenced signals with single supply
- On-chip temperature sensor
- On-chip 2.5 V reference (typ 25 ppm/°C)
- AC/DC system calibrations
- Phase compensation
- Simple 3-wire digital serial interface
- Power-supply monitor
- Programmable energy-to-pulse output function
- Configurable pulse outputs for stepper motor or mechanical counter
