STPM11ATR STMicroelectronics, STPM11ATR Datasheet - Page 34

• 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

Energy calculation algorithm
8
Figure 22. Active energy computation diagram
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Energy calculation algorithm
Inside the STPM1x the computing section of the measured active power uses a completely
new patented signal process approach. This approach allows the device to reach high
performances in terms of accuracy.
The signals, coming from the sensors, for the instantaneous voltage is:
Equation 7
v(t) = V•sin ωt; where V is the peak voltage and ω is related to the line frequency
and the instantaneous current is:
Equation 8
i(t) = I • sin (ωt + ϕ); where I is the peak current, ω is related to the line frequency and ϕ is
the phase difference between voltage and current
Active power
Doc ID 13167 Rev 7
STPM11, STPM12, STPM13, STPM14