STPM10 datasheet(17/51 Pages) STMICROELECTRONICS

부품명	STPM10

상세설명	Programmable single-phase energy metering IC with tamper detection

PDF	51 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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17 / 51 page

STPM10

Theory of operation

Doc ID 17728 Rev 3

17/51

integration and DC offset cancellation of the supplied

Σ Δ signals. The gain of the

decimation filters is 1.004 for the voltage channel and 0.502 for the current channel. The

resulting signal has a resolution of 11 bits per voltage channel and 16 bits per current

channel.

7.4

Zero-crossing detection

The STPM10 has a zero-crossing detector circuit on the voltage channel which can be used

by application for synchronization of some utility equipment in the event of zero-crossing of

the line voltage. This circuit produces the internal signal ZCR which has a rising edge every

time the line voltage crosses zero, and a negative edge every time the voltage reaches its

positive or negative peak. The ZCR signal is then at twice the line voltage frequency. The

ZCR signal is available on the ZCR pin.

Figure 14.

First-order

ΣΔ A/D converter

DAC

Integrator

fCLK/4

Input analog signal

Output digital signal

∫

Figure 15.

ZCR signal

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