STPM14ATR

Overview

The STPM14ATR is a single-phase energy metering IC from the STPM1x family, designed for accurate active energy measurement using Rogowski coils, current transformers, or shunt sensors. It integrates analog preamplifiers, sigma-delta ADCs, and a hardwired DSP to compute energy values directly into a stepper counter. Key electrical parameters include a supply voltage range of 3 V to 5.5 V, typical supply current of 4.7 mA, and an input impedance of 100 kΩ. The device offers a measurement error of 0.1% and operates within a temperature range of -40°C to 85°C. It features I/O high voltage of 1.5 V and low voltage of 0.8 V.

Feature Summary

• Integrates a hardwired DSP unit that computes consumed active energy from sigma-delta output signals without requiring external microcontrollers.
• Provides ripple-free active energy pulsed output with direct stepper counter drivers for immediate display interfacing.
• Supports calibration via OTP cells programmed through a serial interface, allowing configuration for testing and permanent locking.
• Includes integrated linear voltage regulators and supports both RC oscillators and crystal oscillators for system timing.

Applications

• Single-phase residential and commercial electricity meters
• Energy monitoring systems utilizing Rogowski coil sensors
• Power line systems requiring direct integration with current transformers
• Applications needing live and neutral monitoring capabilities

Procurement Notes

Verify component authenticity as the STPM14ATR is listed as obsolete and no longer manufactured. Confirm availability of qualified substitutes such as the STPM33TR if new production is required. Ensure compliance with RoHS3 specifications and check moisture sensitivity level (MSL 3) handling requirements during storage and assembly processes.

Selection Notes

Select this component for designs requiring precise single-phase energy measurement with minimal external active components. The integrated DSP and direct stepper counter drivers simplify firmware development by offloading energy computation tasks. Consider the specific sensor type compatibility, such as shunts or current transformers, when finalizing the analog front-end design.

Part Context

The STPM14ATR belongs to the STPM1x family of energy metering ICs, which are engineered to implement complete single-phase energy meters without additional active parts. This family combines analog signal conditioning with digital processing to deliver calibrated energy readings. The ATR suffix indicates tape and reel packaging suitable for automated surface-mount assembly in high-volume manufacturing environments.

Replacement Considerations

The STPM33TR is identified as a similar substitute part number available from STMicroelectronics. Verify functional equivalence regarding pinout and software compatibility before transitioning production to this alternative component.