STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 18

• Manufacturer Part Number: STEVAL-IPE012V1
• Description: EVAL BOARD ENERGY METER
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-IPE012V1

• Design Resources: STEVAL-IPE012V1 Schematic STEVAL-IPE012V1 BOM
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: STPM10BTR, STM8L152
• Primary Attributes: Single Phase with 1 Current Transformer & Shunt
• Secondary Attributes: Tamper Detection
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11462

Theory of operation
7.5
Figure 16. LIN and BFR signals
18/51
Period and line voltage measurement
The period module measures the period of the base frequency of the voltage channel and
checks if the voltage signal frequency is within the f
LIN signal is produced, which is low when the line voltage is rising, and high when the line
voltage is falling. This means that the LIN signal is the sign of dv/dt. With further elaboration,
the ZCR signal is also produced. On the trailing edge of LIN (line frequency) the period
counter starts counting up pulses of the f
on the status bit register (see
If the counted number of pulses between two trailing edges of LIN is higher than 2
the counting is never stopped (no LIN trailing edge) this means that the base frequency is
lower than f
If the number of pulses counted between two trailing edges of LIN is lower than 2
base frequency exceeds the limit (this means it is higher than f
error must be repeated three consecutive times in order to set the BFR error flag.
For example, with a 4.194304 MHz oscillator frequency and MDIV bit clear (or 8.192 MHz
with MDIV set), f
pulses between two LIN trailing edges are 34952, more than 2
The BFR low frequency limit is then:
f
CLK
/2
17
= 4194304/131072 = 32 Hz
CLK
/2
CLK
17
Hz and a BFR (base frequency range) error flag is set.
/4 is 1.048576 MHz. If the line frequency is 30 Hz, the counted f
Table
Doc ID 17728 Rev 3
10).
CLK
/4 reference signal. The LIN signal is available
CLK
/2
17
to f
15
CLK
CLK
(32768 pulses).
/2
/2
15
15
). In this case, the
band. To do this, the
13
15
STPM10
, the
CLK
, or if
/4