Input Section

Pin Descriptions and Debouncing Requirements

Input Pins Overview

Pin Name	Description	Debouncing Required	Purpose	Notes
LINE_PE_IN	Input power statusk	Yes	Safety	Pulse
LINE_N_RLY	Output power status	Yes	Safety	Pulse
IO0_BOOT	Debug input button	Yes	Debug	Active Low
METER_INT1	Meter pulse input	No	Essentials	Active Low
QCA7005_INT	QCA7005 interrupt	No	Essentials	Active High
W5500_INT	W5500 interrupt	No	Essentials	Active Low
XPNDR_INT	IO expander interrupt	No	Essentials	Active Low
nEMERGENCY	Emergency stop button	Yes	Safety	Active Low(connected through IO expander)
USB_DETECT	USB connection detection	Yes	Add-ons	Active High(connected through IO expander)
LIS_INT	Accelerometer interrupt	No	Add-ons	Active High(connected through IO expander)
TMP_ALERT	Temperature sensor alert	No	Add-ons	Active Low(connected through IO expander)

Debouncing Requirements

• Pins Requiring Debouncing:

  • Pins associated with buttons, power status detection, and emergency stop functions, where signal stability is critical to system reliability.

  • Adequate signal conditioning is necessary to avoid erroneous signal interpretation caused by noise or transient fluctuations.

Implementation Notes

• Check every rising and falling time of the signal to determine if the system catches it exactly.

• Use an interrupt-driven approach to initiate the debouncing process. During this period, disable the associated interrupt to prevent redundant or spurious interrupt handling, thereby conserving processing resources.

  • For instance, LINE_PE_IN and LINE_N_RLY pins may generate frequent interrupts at a microsecond scale if not managed correctly during debouncing, leading to resource inefficiency.