STPM32 datasheet(44/89 Pages) STMICROELECTRONICS

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Bit

Internal signal

Description

PH2 IRQ status(1)

Sign secondary apparent power

Overflow secondary channel active energy

Overflow secondary channel active fundamental energy

Overflow secondary channel reactive energy

Overflow secondary channel apparent energy

PH1 IRQ status

Sign primary channel active power

Sign primary channel active fundamental power

Sign primary channel reactive power

Sign primary channel apparent power

Overflow primary channel active energy

Overflow primary channel active fundamental energy

Overflow primary channel reactive energy

Overflow primary channel apparent energy

Cx IRQ status

Current sigma-delta bitstream stuck

AH1 - accumulation of current

Current swell detected

Current swell end

Vx IRQ status

Voltage sigma-delta bitstream stuck

Voltage period error

Voltage sag detected

Voltage sag end

Voltage swell detected

Voltage swell end

Tamper status(1)

Tamper

Tamper or wrong connection

1. Valid for the STPM33 and STPM34 only.

Interrupt control mask register

Each bit in the status register has a correspondent bit in DSP_IRQ1, DSP_IRQ2 interrupt mask registers. For

each bit set, the relative event detection is output on INT1, INT2 pins respectively. In the STPM32, DSP_IRQ1 is

mapped on INT1 pin only.

Status bits can be monitored by an external microcontroller application, in fact when INTx pin triggers, the

application reads the relative status register content and clears it.

Note:

Power sign status bits generate level interrupts.

8.5

Functional description of communication peripheral

The STPM3x can be interfaced to a control unit through a programmable communication peripheral which can be:

•

5 pins SPI (MISO, MOSI, SCS, SYN, SCL)

•

4 pins UART (RX, TX, SCS, SYN).

The serial communication peripherals share same pins so that they cannot be used at the same time.

Interface selection is implemented through an internal detection system that, at the device startup, detects which

of the two communication interfaces has to be used. This feature allows communication to be quickly established

with minimal initialization.

Auto-detection works at startup, (power-up or EN pin transition from low to high) by monitoring SCS pin status

and automatically selecting the communication interface that matches the configuration:

STPM32, STPM33, STPM34

Functional description of communication peripheral

DS10272 - Rev 13

page 44/89

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