STPM01_11 STMICROELECTRONICS [STMicroelectronics], STPM01_11 Datasheet - Page 18
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STPM01_11
Manufacturer Part Number
STPM01_11
Description
Programmable single phase energy metering IC with tamper detection
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.STPM01_11.pdf
(60 pages)
- Current page: 18 of 60
- Download datasheet (2Mb)
Theory of operation
Table 8.
Table 9.
Note:
18/60
Gain
16
24
32
32
16
24
32
8
8
8
8
8
Gain
The maximum differential input voltage is dependent on the selected gain according to the
following table.
Gain of voltage and current channels
The gain register is included in the device configuration register with the address names
PST and ADDG. The table below shows the gain configuration according to the register
values:
Configuration of current sensors
If the device is used in configuration PST = 7 (primary channel with CT, secondary channel
with Shunt), the shunt Ks must always be equal to one fourth of the current transformer Ks.
Both the voltage and current channels implement an active offset correction architecture
which gives the benefit to avoid any offset compensation.
The analog voltage and current signals are processed by the ∑ Δ Analog to digital
converters that feed the hardwired DSP. The DSP implements an automatic digital offset
cancellation that make possible avoiding any manual offset calibration on the analog inputs.
4
Primary
Voltage channels
Rogowsky Coil
Rogowsky Coil
Sensor
Shunt
CT
CT
Max Input voltage (V)
±0.30
Gain
Disabled (No Tamper)
16
24
32
32
8
8
Doc ID 10853 Rev 8
Secondary
Rogowsky Coil
Sensor
Shunt
CT
Gain
16X
24X
32X
8X
Current channels
PST (3 bits)
0
0
1
1
2
3
4
4
5
5
6
7
Configuration Bits
Max input voltage (V)
±0.075
±0.035
±0.15
±0.05
ADDG (1 bit)
X
X
X
X
0
1
0
1
0
1
0
1
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