STPM10 Datasheet, PDF (1/51 Pages) STMicroelectronics – Programmable single-phase energy metering IC with tamper detection

STPM10
Programmable single-phase energy metering IC
with tamper detection
Features
■ Measures active, reactive, and apparent
energies
■ Current, voltage RMS and instantaneous
measurement
■ Frequency measurement
■ Ripple-free active energy pulsed output
■ Live and neutral monitoring for tamper
detection
■ Fast and simple one-point digital calibration
over the whole current range
■ Integrated linear voltage regulators for digital
and analog supply
■ Selectable RC or crystal oscillator
■ Supports 50 - 60 Hz - IEC62052-11, IEC62053-
2x specifications
■ Less than 0.1% error in the 1000:1 range
■ Precision voltage reference: 1.23 V with 30
ppm/°C max
Description
The STPM10 is designed for effective
measurement of active, reactive and apparent
energy in a power line system using current
transformer and shunt sensors. The device can
be implemented for peripheral measurement in a
microcontroller-based single-phase or poly-phase
energy meter. The STPM10 consists of two main
sections: analog and digital. The analog part is
composed of preamplifier and first-order sigma-
delta A/D converter blocks, a band-gap voltage
reference and low-drop voltage regulator. The
digital part is composed of system control,
oscillator, hard-wired DSP and SPI interface.
There is also an internal volatile memory, which is
Table 1. Device summary
Order code
Temperature range
STPM10BTR
- 40 to 85 °C
TSSOP20
controlled through the SPI by means of a
dedicated command set. The configured bits are
used for configuration and calibration purposes.
From a pair of sigma-delta output signals
produced by the analog section, the DSP unit
computes the amount of active, reactive and
apparent energy consumed, as well as the RMS
and instantaneous voltage and current values.
The results of the computation are available as
pulse frequencies and states on the digital
outputs of the device, or as data bits in a data
stream, which can be read from the device by
means of the SPI interface. The system bus
interface is also used for temporary programming
of bits of internal volatile memory. The STPM10
generates an output signal with a pulse frequency
proportional to the energy, and this signal is used
in the calibration phase of the energy metering
application.
Package
TSSOP20 (tape and reel)
Packaging
2500 parts per reel
June 2011
Doc ID 17728 Rev 3
1/51
www.st.com
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