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September 2004

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INTEGRATED LINEAR VREGS TO SUPPLY

THE DIGITAL AND ANALOG CORES

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ADVANCED BICMOS TECHNOLOGY FOR

HIGH PERFORMANCE

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OTP FOR CALIBRATION AND

CONFIGURATION

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INTEGRATED OSCILLATOR WITH

EXTERNAL RESISTOR OR CRYSTAL

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MONITOR BOTH LIVE AND NEUTRAL FOR

TAMPER DETECTION

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POWER SUPPLY CURRENT LESS THAN

6mA

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SUPPORT 50 ÷ 60 Hz – IEC 62052-11,

IEC 62053-2X SPECIFICATION FOR CLASS

0.5 AC WATT METERS

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PRECISION VOLTAGE REFERENCE ON

CHIP: 1.25 V AND 30 ppm/°C MAX

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TSSOP20 PACKAGE

DESCRIPTION

The

STPM01

is

designed

for

effective

measurement of active energy in a power line

system

using

the

Rogowski

and/or

Shunt

principle. This device can be implemented as a

single chip 1-phase energy meter or as a

peripheral measurement in a microprocessor

based 1-phase or 3-phase energy meter.

The STPM01 consists, essentially, of two parts:

the analog part and the digital part. The former, is

ΣD AD

converter blocks, Bandgap voltage reference,

Lowdrop voltage regulator and a pair of DC buffer,

the latter, is composed by system control, clock

generator, hard wired DSP and SPI interface.

There is also a OTP block, which is controlled

through the SPI by means of a dedicated

command set. The configured bits are used for

testing, configuration and calibration purpose.

From a pair of

ΣD output signals coming from

analog section, a DSP unit computes the amount

of consummated active, reactive and apparent

energy, RMS values of voltage and current value.

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 the calibration is very easy: an

output signal with pulse frequency proportional to

energy is generated, this signal is used to enable

the calibration of the energy meter.

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.

Table 1: Order Codes

Type

Temperature

Range

Package

Comments

STPM01

-40 to 85 °C

TSSOP20 (Tape & Reel)

2500 parts per reel

STPM01

PROGRAMMABLE SINGLE PHASE ENERGY METERING

IC WITH TAMPER DETECTION

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

TSSOP

PRELIMINARY DATA

Rev. 1