Communication system and IoT system
A communication system and an IoT system are provided. The IoT system is applicable to a wireless network system including an access point. The IoT system includes a WiFi module and a GPIO device. The WiFi module is configured to connect to the access point. The GPIO device is configured to provide a plurality of wake-up signals to the WiFi module through a GPIO pin. A predetermined time period between any two of wake-up signals is greater than an interval between two delivery traffic indication messages from the access point. The WiFi module includes a timer and a power management unit, the power management unit drains power to transfer the WiFi module from a sleep mode to a normal mode after the timer receives the wake-up signal.
1. An Internet of Things (IoT) system, applicable to a wireless network system including an access point, the IoT system comprising:
a WiFi module, configured to connect to the access point; and
a general purpose input/output (GPIO) device, configured to provide a plurality of wake-up signals to the WiFi module through a GPIO pin, and
wherein a predetermined time period between any two of wake-up signals is greater than an interval between two delivery traffic indication messages from the access point;
wherein the WiFi module includes a connectivity module, a central processing unit, a timer and a power management unit, the power management unit drains power to transfer the WiFi module from a sleep mode to a normal mode after the timer receives the wake-up signal,
wherein while the WiFi module is in the sleep mode, the connectivity module, the central processing unit and the power management unit are powered off, and after receiving the wake-up signal, the timer powers on the power management unit, and then the power management unit drains power to the connectivity module and the central processing unit, so as to transfer the WiFi module from the sleep mode to the normal mode.
2. The IoT system of claim 1 , wherein the timer is powered off while the WiFi module is in the sleep mode, and upon receiving the wake-up signal, the timer is powered on.
3. The IoT system of claim 1 , wherein if the power management unit drains power to the central processing unit, the central processing unit performs a cold booting process and initializes the connectivity module.
4. The IoT system of claim 1 , wherein the WiFi module further includes a retention memory, the retention memory is configured to store authentication information of the connectivity module and/or codes executed by the central processing unit.
5. The IoT system of claim 4 , wherein the retention memory is powered on while the WiFi module is in the sleep mode, and if the power management unit drains power to the central processing unit, the central processing unit performs a warm booting process and initializes the connectivity module.
6. The IoT system of claim 1 , wherein the connectivity module has a connected state and an authenticated state, and upon operating in the connected state, the connectivity module performs a connection process, and upon operating in the authenticated state, the connectivity module performs an authentication process.
7. The IoT system of claim 1 , further including a power supply which is configured to provide power to the connectivity module, the central processing unit, the power management unit and the timer.
8. The IoT system of claim 1 , wherein the GPIO device comprises a touch panel and the wake-up signal is generated when the touch panel is being touched.