特性 Features

? Active power accuracy:

– < 0.1 error over 5000: 1 dynamic range

– < 0.5 error over 10000: 1 dynamic range

? Exceeds 50-60 Hz 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 3.6 kHz at -3 dB

? Vcc supply range 3.3 V ± 10

? Supply current Icc 4.3 mA (STPM32)

? Input clock frequency 16 MHz, Xtal or external

source

? Twin precision voltage reference: 1.18 V with

independent programmable TC, 30 ppm/°C

typ.

? Internal low drop regulator at 3 V (typ.)

? QFN packages

? Operating temperature from -40 °C to +105 °C

描述 Description

The STPM3x is an ASSP family designed for high

accuracy measurement of power and energies in

power line systems using the Rogowski coil,

current transformer or shunt current sensors. The

STPM3x provides instantaneous voltage and

current waveforms and calculates RMS values of

voltage and currents, active, reactive and

apparent power and energies. The STPM3x is a

mixed signal IC family consisting of an analog and

a digital section. The analog section consists of

up to two programmable gain low-noise low-offset

amplifiers and up to four 2nd order 24-bit sigmadelta

ADCs, two bandgap voltage references with

independent temperature compensation, a low

drop voltage regulator and DC buffers. The digital

section consists of digital filtering stage, a

hardwired DSP, DFE to the input and a serial

communication interface (UART or SPI). The

STPM3x is fully configurable and allows a fast

digital system calibration in a single point over the

entire current dynamic range.