STMicroelectronics STPMS2H-PUR

Overview

STPMS2H-PUR from STMicroelectronics is a dual-channel, second-order sigma-delta modulator with integrated chopper-stabilized programmable-gain amplifier (PGLNA), 4 MHz clock support, 1.23 V temperature-compensated reference, and internal 3.0 V LDO regulator. It serves as an analog front-end for precision AC energy metering systems using shunt, CT, or Rogowski sensors, delivering ≤0.5% error over 1:5000 dynamic range in class 0.2 meters per IEC 62053-22.

For engineers reviewing the STPMS2H-PUR datasheet, STPMS2H-PUR pinout, STPMS2H-PUR application, or STPMS2H-PUR equivalent, key selection criteria include its dual ΣΔ channel architecture, programmable gain amplifier offset/noise performance, EN 50470/IEC 62053 compliance support, and compatibility with STPMC1 DSP-based metering platforms.

Technical Context

The STPMS2H-PUR integrates two independent second-order sigma-delta modulators-one for current (CIP/CIN) and one for voltage (VIP/VIN)-each with dedicated analog signal paths, non-overlapping clock control, and crosstalk isolation >130 dB. Its chopper-stabilized PGLNA supports gain settings of 2×, 4×, 8×, and 16×, enabling high-resolution current measurement down to ±37.5 mV full-scale at 16× gain.

Digital operation includes hard mode (fixed configuration), soft mode (SPI-configurable via MS0–MS3), and BIST-enabled test mode. Clock input accepts 1.0–4.9 MHz, with high-precision mode (4.19 MHz nominal) delivering 0–4 kHz effective bandwidth and low-power mode (1.229 MHz) reducing quiescent current to 1.5 mA while narrowing bandwidth to 0–1 kHz.

Key Specifications

Pinout & Package

STPMS2H-PUR is housed in a QFN16 (4 mm × 4 mm, 0.5 mm pitch) package with wettable flanks, optimized for automated optical inspection and thermal dissipation in compact meter PCBs. The exposed pad must be soldered to GND for optimal EMI immunity and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel sigma-delta modulator applications.

Compared with AMC1305M05 and AD7403, the STPMS2H-PUR uniquely integrates dual ΣΔ channels, chopper-stabilized PGLNA, on-chip LDO and TC reference-reducing bill-of-materials count by ≥4 components and enabling class 0.2 meter compliance without external calibration circuitry.

Availability

STPMS2H-PUR is available at Aetrix Electronics and suitable for smart electricity metering, industrial motor control, and precision transducer interface applications requiring stable component supply, long-lifecycle availability, and full traceability to STMicroelectronics wafer lots.

Supply support for STPMS2H-PUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The STPMS2 product line targets high-accuracy energy measurement systems, combining precision analog front-ends with digital configurability to simplify compliance with international metering standards including IEC 62053 and EN 50470.

FAQ

What is the difference between STPMS2H-PUR and STPMS2L-PUR?

The STPMS2H-PUR and STPMS2L-PUR share identical architecture, pinout, and electrical specifications, but differ in factory-trimmed performance: STPMS2L-PUR guarantees <0.5% error over 1:5000 dynamic range per IEC 62053-22 class 0.2, while STPMS2H-PUR is characterized for high-precision metering applications with tighter gain/offset tolerances and extended temperature validation. Both use the same QFN16 package and are functionally interchangeable in design.

Can STPMS2H-PUR operate without an external clock source?

No. STPMS2H-PUR requires an external CMOS-compatible clock signal applied to the CLK pin within 1.0–4.9 MHz. It has no internal oscillator. Clock frequency directly determines operating mode (low-power vs. high-precision), effective bandwidth (0–1 kHz or 0–4 kHz), and sampling resolution. Omitting the clock halts all analog-to-bitstream conversion.

How does the programmable gain amplifier (PGLNA) interface with Rogowski coil sensors?

The PGLNA accepts differential inputs at CIP/CIN with ±0.3 V maximum swing. For Rogowski coils, a passive integrator (RC network) converts di/dt output to proportional voltage, which is then scaled via external resistors to fit within the PGLNA's input range. Gain selection (2×–16×) sets full-scale sensitivity-for example, 16× gain allows ±37.5 mV input to produce full-scale bitstream, matching typical coil integrator outputs.

Is STPMS2H-PUR compatible with STPMC1, and what interface signals are required?

Yes. STPMS2H-PUR is co-designed with STPMC1: DAT and DATn provide differential bitstream outputs synchronized to CLK; STPMC1 decodes these into 24-bit voltage/current samples. No SPI or parallel bus is needed-the interface is purely synchronous serial. MS0–MS3 pins configure STPMS2H-PUR startup mode, but once running in hard mode, only CLK, DAT, DATn, and power/GND are required for continuous operation with STPMC1.