CS5461A datasheet(5/44 Pages) CIRRUS

5 / 44 page

CS5461A

DS661F2

1. OVERVIEW

The CS5461A is a CMOS monolithic power measurement device with a computation engine and an en-

ergy-to-frequency pulse output. The CS5461A combines a programmable-gain amplifier, two

∆Σ ana-

log-to-digital converters (ADCs), system calibration and a computation engine on a single chip.

The CS5461A is designed for power measurement applications and is optimized to interface to a cur-

rent-sense resistor or transformer for current measurement, and to a resistive divider or potential trans-

former for voltage measurement. The voltage and current channels provide programmable gains to

accommodate various input levels from a wide variety of sensing elements. With single +5 V supply on

VA+/AGND, both of the CS5461A’s input channels can accommodate common mode as well as signal

levels between (AGND - 0.25 V) and VA+.

Additionally, the CS5461A is equipped with a computation engine that calculates IRMS, VRMS, apparent

power and active (real) power. To facilitate communication to a microprocessor, the CS5461A includes a

simple three-wire serial interface which is SPI™ and Microwire™ compatible. The CS5461A provides

three outputs for energy registration. E1 and E2 are designed to directly drive a mechanical counter or

stepper motor, or interface to a microprocessor. The pulse output E3 is designed to assist with meter cal-

ibration.

CS5461A 데이터시트(PDF) 5 Page - Cirrus Logic