STPM11ATR STMicroelectronics, STPM11ATR Datasheet - Page 16

• Manufacturer Part Number: STPM11ATR
• Description: IC ENERGY METER 1 PHASE 20TSSOP
• Manufacturer: STMicroelectronics

Specifications of STPM11ATR

• Input Impedance: 100 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 1.5V
• Voltage - I/o Low: 0.8V
• Current - Supply: 4.7mA
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Meter Type: Single Phase
• Output Voltage: +/- 0.4 V
• Output Current: 150 mA
• Input Voltage: 3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5984-2

Theory of operation
Table 8.
Table 9.
7.3
16/46
Gain
16
24
32
8
8
8
Gain
16
24
32
32
The
Configuration of current sensors
Configuration of current sensors
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.
∑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.
8
8
Primary
Table 8
Rogowsky Coil
Current channel
Sensor
CT
and
Table 9
Rogowsky Coil
below show the gain values according to the configuration bits:
Sensor
Shunt
CT
Gain
16
24
32
32
8
8
Doc ID 13167 Rev 7
Secondary
STPM11/12
STPM13/14
Rogowsky Coil
Sensor
Shunt
CT
PST (2bits)
STPM11, STPM12, STPM13, STPM14
0
0
1
1
2
3
Configuration Bits
PST (2bits)
0
0
1
1
2
3
Configuration Bits
ADDG (1 bit)
ADDG (1 bit)
0
1
0
1
x
x
0
1
0
1
x
x