STPM01_11 Datasheet, PDF (1/60 Pages) STMicroelectronics – Programmable single phase energy metering IC with tamper detection

STPM01
Programmable single phase energy metering IC
with tamper detection
Features
■ Active, reactive, apparent energies and RMS
values
■ Ripple free active energy pulsed output
■ Live and neutral monitoring for tamper
detection
■ Easy and fast digital calibration in only one
point over the whole current range
■ OTP for calibration and configuration
■ Integrated linear VREGs for digital and analog
supply
■ Selectable RC or crystal oscillator
■ Support 50 ÷ 60 Hz – IEC62052-11, IEC62053-
2x specification
■ Less than 0.1 % error
■ Precision voltage reference: 1.23 V and 30
ppm/°C max
Description
The STPM01 is designed for effective
measurement of active, reactive and apparent
energy in a power line system using Rogowski
coil, current transformer and shunt sensors. This
device can be implemented as a single chip
monophase energy meter or as a peripheral
measurement in a microcontroller based
monophase or 3-phase energy meter. The
STPM01 consists, essentially, of two parts: the
analog part and the digital part. The former, is
composed by preamplifier and 1^st order Δ ∑ A/D
converter blocks, band gap voltage reference, low
drop voltage regulator, the latter, is composed by
system control, oscillator, hard wired DSP and
SPI interface. There is also an OTP block, which
is controlled through the SPI by means of a
Table 1. Device summary
Order code
Temperature range
STPM01FTR
- 40 to 85 °C
TSSOP20
dedicated command set. The configured bits are
used for testing, configuration and calibration
purpose. From a pair of Δ ∑ output signals coming
from analog section, a DSP unit computes the
amount of consummated active, reactive and
apparent energy, RMS and instantaneous values
of voltage and current. The results of computation
are available as pulse frequency 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 SPI interface. This system bus
interface is used also during production testing of
the device and/or for temporary or permanent
programming of bits of internal OTP. In the
STPM01 an output signal with pulse frequency
proportional to energy is generated, this signal is
used in the calibration phase of the energy meter
application allowing a very easy approach. When
the device is fully configured and calibrated, a
dedicated bit of OTP block can be written
permanently in order to prevent accidental
entering into some test mode or changing any
configuration bit.
Package
TSSOP20 (tape and reel)
Packaging
2500 parts per reel
June 2011
Doc ID 10853 Rev 8
1/60
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