ST-PLC-AFE datasheet(51/58 Pages) STMICROELECTRONICS

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ST-PLC-AFE

Application information

10.7

ST-PLC-AFE consumption (no load)

10.8

Zero crossing detector

The ST-PLC-AFE integrates two zero crossing detectors which are used to detect when the

mains signal crosses 0 V. Such information is used to ensure that the device is properly

synchronized while it is communicating on the power lines.

Figure 52 shows the signal behavior when an AC main signal is applied on the zero

crossing input pin of the device with an in-series resistor of 1 MΩ. The AC main voltage in

this example is 220 V at 50Hz. The zero crossing detector behaves similarly when 110 V of

AC voltage is applied at 60 Hz.

Figure 52. Zero crossing detector with 220 V AC main signal

Figure 53 shows the zero crossing detector threshold voltages. To avoid unwanted toggling,

this block integrates an in-built hysteresis.

Table 20. Power consumption matrix

TX_EN

RX_EN

PA_EN

PA2_EN

DAC_EN

HP_filter EN

AVDD

DVDD

PA_VDD

2.9 mA

130 µA

60 mA

2.1 mA

130 µA

60 mA

2.1 mA

130 µA

31 mA

1.8 mA

130 µA

23 µA

2.8 mA

130 µA

23 µA

3.4 mA

130 µA

23 µA

590 µA

130 µA

23 µA

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