UPS Scap 5V5A: Difference between revisions

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==Related Explanation==

'''5.1 PD Handshake Protocol'''

'''1.PD Handshake Protocol'''

* The Raspberry Pi 5 uses a non-standard PD handshake protocol. Even if a standard 5V 5A power supply is used and the voltage and current meet the requirements, the system will still issue an alarm if the corresponding handshake protocol is missing.

* This module's USB-C output natively integrates a PD handshake chip, ensuring perfect compatibility with the Raspberry Pi 5 and eliminating pop-up alarms.

* The USB-A port can be used with a USB A-C PD adapter to provide a second power source for the Raspberry Pi 5.

'''5.2 Power-Off Detection and Power-On/Off Logic'''

'''2.Power-Off Detection and Power-On/Off Logic'''

* '''Detection Method''': Raspberry Pi 5 detects the external power status in real time via GPIO26 pin.

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* '''Dead Zone Special Condition (Extremely Low Probability)''': After sending the shutdown command, the screen will briefly display plymouth-poweroff.service (lasting approximately 1-2 seconds). If external power is restored during this window, the system will lock and cannot start, only recovering after the next power outage and power-on cycle. Dead zones are extremely rare, so there's no need to worry about them for local use; however,'''thorough testing and evaluation are recommended for remote, unattended scenarios.'''

'''3.I2C Voltage and Current Monitoring'''

* Real-time I2C bus reading via the INA219 chip: capacitor voltage, charging/discharging current, and power; remaining battery life can be estimated based on voltage.

* Supports Raspberry Pi OS and Ubuntu systems.

'''4.Power-Down Detection GPIO Script Demonstration '''

The board has an onboard power-down detection circuit. For a Raspberry Pi 5, it's directly connected to GPIO26 of the 40-pin GPIO for detection. See below for specific instructions (using a Raspberry Pi system as an example; the I2C interface needs to be enabled beforehand). The script code is as follows (script name: gpiot.sh): Power-Down Indication Script Demonstration

'''5.This module can also be used on non-Raspberry Pi 5 platforms, but please note the following:'''

# Power-down detection: Connect the detection signal through the appropriate GPIO pin and read the voltage and current via I2C to determine the charging and discharging status.

# Power-on/off logic: Most development boards do not have dedicated power-on/off logic for Raspberry Pi 5. After power-off, the system may enter a locked state upon power restoration.

# Recommended solution: After saving the data, the application continuously monitors the power-down detection pin. If power is restored, the application continues to execute the business process; if power is not restored, it will idle and wait for the system to shut down due to power failure.

# Compatibility prerequisites: If the target board has a logic power-on/off pin, it can be connected to implement the same automatic power-on/off function as Raspberry Pi 5.

==FAQ==

@@ Line 98: / Line 98: @@
 ==Related Explanation==
-'''5.1 PD Handshake Protocol'''
+'''1.PD Handshake Protocol'''
 * The Raspberry Pi 5 uses a non-standard PD handshake protocol. Even if a standard 5V 5A power supply is used and the voltage and current meet the requirements, the system will still issue an alarm if the corresponding handshake protocol is missing.
 * This module's USB-C output natively integrates a PD handshake chip, ensuring perfect compatibility with the Raspberry Pi 5 and eliminating pop-up alarms.
 * The USB-A port can be used with a USB A-C PD adapter to provide a second power source for the Raspberry Pi 5.
-'''5.2 Power-Off Detection and Power-On/Off Logic'''
+'''2.Power-Off Detection and Power-On/Off Logic'''
 * '''Detection Method''': Raspberry Pi 5 detects the external power status in real time via GPIO26 pin.
@@ Line 115: / Line 115: @@
 * '''Dead Zone Special Condition (Extremely Low Probability)''': After sending the shutdown command, the screen will briefly display plymouth-poweroff.service (lasting approximately 1-2 seconds). If external power is restored during this window, the system will lock and cannot start, only recovering after the next power outage and power-on cycle. Dead zones are extremely rare, so there's no need to worry about them for local use; however,'''thorough testing and evaluation are recommended for remote, unattended scenarios.'''
+'''3.I2C Voltage and Current Monitoring'''
+* Real-time I2C bus reading via the INA219 chip: capacitor voltage, charging/discharging current, and power; remaining battery life can be estimated based on voltage.
+* Supports Raspberry Pi OS and Ubuntu systems.
+'''4.Power-Down Detection GPIO Script Demonstration '''
+The board has an onboard power-down detection circuit. For a Raspberry Pi 5, it's directly connected to GPIO26 of the 40-pin GPIO for detection. See below for specific instructions (using a Raspberry Pi system as an example; the I2C interface needs to be enabled beforehand). The script code is as follows (script name: gpiot.sh): Power-Down Indication Script Demonstration
+'''5.This module can also be used on non-Raspberry Pi 5 platforms, but please note the following:'''
+# Power-down detection: Connect the detection signal through the appropriate GPIO pin and read the voltage and current via I2C to determine the charging and discharging status.
+# Power-on/off logic: Most development boards do not have dedicated power-on/off logic for Raspberry Pi 5. After power-off, the system may enter a locked state upon power restoration.
+# Recommended solution: After saving the data, the application continuously monitors the power-down detection pin. If power is restored, the application continues to execute the business process; if power is not restored, it will idle and wait for the system to shut down due to power failure.
+# Compatibility prerequisites: If the target board has a logic power-on/off pin, it can be connected to implement the same automatic power-on/off function as Raspberry Pi 5.
 ==FAQ==