STPM11, STPM12 STPM13, STPM14 Single phase energy metering IC with pulsed output and digital calibration Features Ripple free active energy pulsed output Direct stepper counter drivers Shunt, current transformer, Rogowsky coil sensors Live and neutral monitoring (STPM13/14) Easy and fast digital calibration at only one load point TSSOP20 No-load, negative power and tamper indicators Integrated linear VREGs RC (STPM11/13) or crystal oscillator configuration. The calibration and configuration (STPM12/14) are done by OTP cells, that can be programmed through a serial interface. The configured bits are Support 50 60 Hz - IEC62052-11, IEC62053- used for testing, configuration and calibration 2X specification purposes. From two output signals coming Less than 0.1% error from the analog section, a DSP unit computes the amount of consumed active energy. The active Description energy is available as a pulse frequency output and directly driven by a stepper counter. In the The STPM1x family is designed for effective STPM1x an output signal with pulse frequency measurement of active energy in a power line proportional to energy is generated. This signal is system using a Rogowski Coil, current used in the calibration phase of the energy meter transformer and shunt sensors. This device is application allowing a very easy approach. When specifically designed to provide all the necessary the device is fully configured and calibrated, a features to implement a single phase energy dedicated bit of OTP block can be written meter without any other active component. The permanently in order to prevent accidental entry STPM1x device family consists, essentially, of two into test mode or changing any configuration bit. parts: the analog part and the digital part. The former, is composed of a preamplifier and first order A/D converter blocks, band gap voltage reference, low drop voltage regulator. The digital part is composed of a system control, oscillator, hard wired DSP and interface for calibration and Table 1. Device summary Order codes Package Packaging STPM11ATR TSSOP20 (tape and reel) 2500 parts per reel STPM12ATR TSSOP20 (tape and reel) 2500 parts per reel STPM13ATR TSSOP20 (tape and reel) 2500 parts per reel STPM14ATR TSSOP20 (tape and reel) 2500 parts per reel June 2011 Doc ID 13167 Rev 8 1/46 www.st.com 46 Obsolete Product(s) - Obsolete Product(s) Contents STPM11, STPM12, STPM13, STPM14 Contents 1 Schematic diagram . 5 2 Pin configuration . 6 3 Maximum ratings 8 4 Electrical characteristics . 9 5 Terminology . 12 5.1 Measurement error 12 5.2 ADC offset error 12 5.3 Gain error . 12 5.4 Power supply DC and AC rejection . 12 5.5 Conventions . 12 6 Typical performance characteristics . 13 7 Theory of operation 15 7.1 General operation . 15 7.2 Analog inputs 15 7.3 A/D Converters 16 7.4 Period and line voltage measurement . 17 7.5 Single wire meter mode (STPM13/14 with Rogowsky coil sensor) . 18 7.6 Power supply 19 7.7 Load monitoring 20 7.8 Error detection . 21 7.9 Tamper detection module (STPM13/14 only) 21 7.10 Phase compensation 23 7.11 Clock generator 23 7.12 Resetting the STPM1x . 24 7.13 Energy to frequency conversion 24 7.14 Driving a stepper motor 25 7.15 Configuring the STPM1x . 26 2/46 Doc ID 13167 Rev 8 Obsolete Product(s) - Obsolete Product(s)