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NOTE
DRX cycle index values are broadcasted by the base station through the wireless network.
3.5.1.1. USB Application with USB Remote Wakeup Function
If the host supports USB suspend/resume and remote wakeup function, the following three preconditions must be
met to let the module enter sleep mode.
⚫
Use sleep API to enable the sleep mode.
⚫
Ensure the level of pins that configured as wake-up interrupt in Table 5 are under non-wakeup status.
⚫
The host's USB bus, which is connected with the module's USB interface, enters suspended state.
The following figure shows the connection between the module and the host.
Figure 4: Sleep Mode Application with USB Remote Wakeup
⚫
Sending data to the module through USB will wake up the module.
⚫
When the module has URC to report, it will send remote wake-up signals via USB bus so as to wake up the
host.
3.5.1.2. USB Application without USB Remote Wakeup Function
If the host supports USB suspend/resume, but does not support remote wake-up function, it needs to be woken up
via the module's GPIO.
There are three preconditions to let the module enter sleep mode.
AG521R-NA_QuecOpen_Hardware_Design
Figure 3: Sleep Mode Current Consumption Diagram
USB_VBUS
USB Interface
GND
Module
Automotive Module Series
AG521R-NA QuecOpen Hardware Design
VDD
USB Interface
GND
Host
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