STEVAL-IPE009V1 STMicroelectronics, STEVAL-IPE009V1 Datasheet - Page 22

• Manufacturer Part Number: STEVAL-IPE009V1
• Description: BOARD EVAL ST72321BR9/STPM14
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-IPE009V1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STPM14, ST72F321BR9T6
• Primary Attributes: 1-Ph 220 VAC, LCD Displays: No-Load, Reverse, Fraud, or Case Tampering
• Secondary Attributes: Up to 4 Tariff Rates, Data Accumulated for Meter Life, Time Stamp for: Tamper, Fraud, Power Failure
• Input Voltage: 220 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: ST72321BR9 And STPM14
• Features: Continuously Detects, Displays No-Load Condition, Reverse Direction, Fraud And Case Tamper Condition
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STPM14, ST72321BR9
• Other names: 497-8434; STEVAL-IPE009V1

Theory of operation
Figure 17. Tamper conditions
22/46
periods of line voltage when the current of secondary channel is used instead. Four periods
before the primary to secondary switching point, a tamper detection module is activated. It is
deactivated after eight periods of line have elapsed. This means that energy of four periods
of primary channel immediately followed by energy of four periods of secondary channel is
sampled within the tamper module. We shall call those samples A and B respectively. From
these two samples the criteria of tamper detection is calculated. If four consecutive new
results of criteria happen, i.e. after elapsed 5.12s at 50 Hz, the meter will enter into tamper
state.
Tamper state
Within this state the multiplex ratio will change either to 60:4, when primary current is higher
than secondary, or to 4:60 otherwise. Thus, the channel with the higher current is used in
the energy calculation. The energy is not averaged by the mentioned ratio, rather the last
measured higher current is used also during 4 line period gap. The gap is still needed in
order to monitor the samples of the non-selected channel, which should check when the
tamper detected state is changed to either normal or another tamper detected state.
Several cases of transition of the state are shown in the
The detected tamper condition is stored in the BIT signal. This signal is connected to the
SDA-TD pin. When this pin is low, a tamper condition has been detected.
Doc ID 13167 Rev 7
STPM11, STPM12, STPM13, STPM14
Figure 17
- below