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STPM34 데이터시트(PDF) 39 Page - STMicroelectronics

부품명 STPM34
상세설명  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM34 데이터시트(HTML) 39 Page - STMicroelectronics

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DS10272 Rev 8
39/121
STPM32, STPM33, STPM34
Theory of operation
121
The decimation ratio, out of the filter cascade, is 512 so that outputs of this block are parallel
24-bit data at a rated frequency of 7.8125 kHz.
The decimation block has a magnitude response -3 dB band of 3.6 kHz and a 2.0 kHz flat
band.
8.3.3
Filter block
The block includes:
DC cancellation filter (BHPFVx, BHPFCx bits)
Rogowski coil Integrator (ROCx bit)
Fundamental harmonic component filter
Figure 31. Filter block diagram
8.3.4
DC cancellation filter
This block removes the DC component of signal from voltage and current signals.
It is a selectable block which can be bypassed in case of particular needs with BHPFVx and
BHPFCx bits in DSP_CR1 and DSP_CR2.
The filter has a passband at -3 dB of 8 Hz
BHPFVx = 0: voltage HPF is included for x channel
BHPFVx = 1: voltage HPF is bypassed for x channel
BHPFCx = 0: current HPF is included for x channel
BHPFCx = 1: current HPF is bypassed for x channel
Rogowski coil Integrator
ROCx bit in DSP_CR1 and DSP_CR2 selects the type of current sensors (CT, shunt or
Rogowski coil):
Reactive
filter
HPF
HPF
ROCOIL
INT
LPF
LPF
BHPFVx
BHPFCx
ROCx
Vx Data [23:0]
Cx Data [23:0]
VxFund[23:0]
Cx Fund[23:0]
CHVx [11:0]
CHCx [11:0]
Vx[23:0]
Cx [23:0]
GIPG1403141207LM



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