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STPM32 Datasheet(PDF) 21 Page - STMicroelectronics

Part # STPM32
Description  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  89 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 21 Page - STMicroelectronics

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Figure 23. Temperature compensation typical curves
1.160
1.170
1.180
1.190
1.200
1.210
1.220
1.230
1.240
1.250
1.260
-60
-40
-20
0
20
40
60
80
100
120
Temperature [°C]
TC 0
TC 1
TC 2
TC 3
TC 4
TC 5
TC 6
TC 7
8.2.2
Analog front end
Analog channel inputs of voltages VIP1, VIN1, VIP2, VIN2 and currents IIP1, IIN1, IIP2, IIN2 are fully differential.
Voltage channels have a preamplification gain of 2, which defines the maximum differential voltage on voltage
channel inputs to ±300 mV.
Current channels have a programmable gain selectable among 2, 4, 8 and 16, which defines the maximum
differential voltage on current channel to ±300 mV, ±150 mV, ±75 mV or ±37.5 mV respectively.
The selection is given by GAINx[1:0] (DFE_CR1, DFE_CR2) bits as described in Table 9 .
Table 9. Current channel input preamplifier gain selection
GAINx0
GAINx1
Gain
Differential input
0
0
X2
±300 mV
0
1
X4
±150 mV
1
0
X8
±75 mV
1
1
X16
±37.5 mV
The oversampling frequency of the modulators is 4 MHz, the output bitstreams of the 2nd order sigma-delta
modulators relative to the voltage and to the two current channels are available on INT and LED output pins
through the proper configuration (see configuration bit map in Table 1, Table 41 and Table 42).
STPM32, STPM33, STPM34
Functional description of the analog part
DS10272 - Rev 13
page 21/89



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