ASSP. STPM33 Datasheet

STPM33 Datasheet PDF


Part Number

STPM33

Description

ASSP

Manufacture

STMicroelectronics

Total Page 30 Pages
Datasheet
Download STPM33 Datasheet


STPM33
STPM32, STPM33, STPM34
ASSP for metering applications with up to four independent 24-bit
2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
Datasheet - production data
QFN24L 4x4x1
QFN32L 5x5x1
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
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
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 sigma-
delta 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.
Table 1. Device summary
Order code
Package
Packing
STPM34TR QFN32L 5x5x1 Tape and reel
STPM33TR QFN32L 5x5x1 Tape and reel
STPM32TR QFN24L 4x4x1 Tape and reel
December 2018
This is information on a product in full production.
DS10272 Rev 8
1/121
www.st.com

STPM33
Contents
Contents
STPM32, STPM33, STPM34
1 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Pin programmability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5 Typical application example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.1 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2 Measurement error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3 ADC offset error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.4 Gain error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8 Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1 General operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.2 Functional description of the analog part . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2.1 Power management section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2.2 Analog front end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.2.3 Clock generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.2.4 Power-on-reset (POR) and enable (EN) . . . . . . . . . . . . . . . . . . . . . . . . 36
8.3 Functional description of the digital part . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.3.1 Digital front end (SDSx bits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.3.2 Decimation block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.3.3 Filter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.3.4 DC cancellation filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.3.5 Fundamental component filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.3.6 Reactive filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.4 Functional description of hardwired DSP . . . . . . . . . . . . . . . . . . . . . . . . . 40
2/121
DS10272 Rev 8





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