STEVAL-IPE012V1 STMicroelectronics, STEVAL-IPE012V1 Datasheet - Page 23

• 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

STPM10
Figure 20. Different oscillator circuits with (a) quartz, (b) internal oscillator, (c) external source
7.11.1
1.
2.
3.
The clock generator is powered from an analog supply and is responsible for two tasks. The
first is to retard the turn-on of some function blocks after POR in order to help smooth the
start of the external power supply circuitry by keeping off all major loads. The second task of
the clock generator is to provide all necessary clocks for the analog and digital parts. During
this task, the MDIV configuration bit is used to inform the device about the nominal
frequency value of CLKOUT. Two nominal frequency ranges are expected to be from 4.000
MHz to 4.194 MHz (MDIV = 0) or from 8.000 MHz to 8.192 MHz (MDIV = 1).
RC startup procedure
To use the device with RC oscillator the configuration bit RC (see
Since the default configuration is for a crystal oscillator, when a RC oscillator is used instead
and the device is supplied for the very first time it is not internally clocked and consequently
the DSP is inactive. In this condition it is not possible to set RC or any other configuration bit.
The following SPI procedure can be run in order to set the RC bit and provide the clock to
the device:
●
●
●
●
●
In this way the RC oscillator is started. If the registers are read again, it can be seen that RC
bit is set and BANK is cleared. Once the RC startup procedure is complete, the device is
clocked and active. For details on mode signals refer to
refer to
RC: this oscillator mode can be selected using the RC configuration bit. If RC = 1, the
STPM10 runs using the RC oscillator. A resistor connected between CLKIN and
ground sets the RC current. For 4 MHz operation, the recommended settling resistor is
12 kΩ. The oscillator frequency can be compensated using the CRC configuration bit.
Quartz: If RC = 0, the oscillator works with an external crystal. The recommended
circuit is depicted in
External clock: by keeping RC=0, it is also possible to feed the CLKOUT pin with an
external oscillator signal.
Set the mode signal BANK;
Perform a software reset;
Read the registers: BANK mode signal should be checked and the records should
show something (not 000000F0);
Clear the mode signal BANK;
DO NOT perform a reading, and write configuration bit RC;
Chapter
7.19.
Figure 20
Doc ID 17728 Rev 3
(b).
Chapter
7.18, for SPI operations
Table
Theory of operation
11) must be set.
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