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STPM11ATR 数据表(PDF) 16 Page - STMicroelectronics

部件名 STPM11ATR
功能描述  Single phase energy metering IC with pulsed output and digital calibration
PDF  46 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STPM11ATR 数据表(HTML) 16 Page - STMicroelectronics

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Theory of operation
STPM11, STPM12, STPM13, STPM14
16/46
Doc ID 13167 Rev 8
The Table 8 and Table 9 below show the gain values according to the configuration bits:
Both the voltage and current channels implement an active offset correction architecture
which has the benefit of avoiding 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 makes possible avoiding any manual offset calibration on the analog
inputs.
7.3
∑Δ A/D Converters
The analog to digital conversion in the STPM1X is carried out using two first order
∑ Δ
converters. The device performs A/D conversions of analog signals on two independent
channels in parallel. In STPM13/14, the current channel is multiplexed as primary or
secondary current channel in order to be able to perform a tamper function. The converted
∑ Δ signals are supplied to the internal hardwired DSP unit, which filters and integrates
those signals in order to boost the resolution and to yield all the necessary signals for
computations.
Table 8.
Configuration of current sensors
STPM11/12
Current channel
Configuration Bits
Gain
Sensor
PST (2bits)
ADDG (1 bit)
8
Rogowsky Coil
00
16
0
1
24
1
0
32
1
1
8CT
2
x
32
Shunt
3
x
Table 9.
Configuration of current sensors
STPM13/14
Primary
Secondary
Configuration Bits
Gain
Sensor
Gain
Sensor
PST (2bits)
ADDG (1 bit)
8
Rogowsky Coil
8
Rogowsky Coil
00
16
16
0
1
24
24
1
0
32
32
1
1
8
CT
8CT
2
x
8
32
Shunt
3
x
Obsolete
Product(s)
- Obsolete
Product(s)



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