STMicroelectronics STPM33/34 单相电表 IC

STMicroelectronics STPM33/34 单相电表 IC 属于 ASSP 系列，它们采用罗氏线圈、电流互感器或旁路电流传感器，在电力线系统中实现对功率和电能的高精确性测量。这些器件可提供瞬时电压和电流波形，并计算电压和电流的均方根（有效）值、有功功率、无功功率、视在功率和电能。STPM33/34 是由模拟部分和数字部分组成的混合信号 IC 系列产品。模拟部分包含多达两个可编程增益低噪声低失调放大器和多达四个二阶 24 位 Σ-Δ 型模数转换器、两个带独立温度补偿的能隙电压基准、一个低压降稳压器和若干直流缓冲器。数字部分包含数字滤波级、一款硬接线 DSP、DFE 连接输入，以及一个串行通信接口（UART 或 SPI）。它们是完全可配置的，在整个电流动态范围中，只需一个负载点即可快速实现数字系统校准。

The STMicroelectronics STPM3x Single Phase Metering ICs are offered in QFN24L (STPM32) and QFN32L (STPM33 and STPM34) packages.

特性

Active power accuracy:<0.1% error over 5000: 1 dynamic range
<0.5% error over 10000: 1 dynamic range
Exceeds 50Hz to 60Hz EN 50470-x, IEC 62053-2x, ANSI12.2x standard requirements for AC watt meters
Reactive power accuracy:<0.1% error over 2000:1 dynamic range
Dual mode apparent energy calculation
Instantaneous and averaged power
RMS and instantaneous voltage and current
Under and overvoltage detection (sag and swell) and monitoring
Overcurrent detection and monitoring
UART and SPI serial interface with programmable CRC polynomial verification
Programmable LED and interrupt outputs

Four independent 24-bit 2nd order sigma-delta ADCs
Two programmable gain chopper stabilized low-noise and low-offset amplifiers
Bandwidth 3.6kHz @ -3dB
V_CC supply range 3.3V±10%
Input clock frequency 16MHz, Xtal or external source
Twin precision voltage reference: 1.23V with independent programmable TC, 10ppm/°C typ.
Internal low drop regulator @ 3V (typ.)
Package options
- STPM32: 4.0mm x 4.0mm QFN24L
- STPM33 and STPM34: 5.0mm x 5.0mm QFN32L
Operating temperature -40°C to +85°C