Product Info

Automotive Module Series
AG521R-NA QuecOpen Hardware Design
AG521R-NA_QuecOpen_Hardware_Design 64 / 104
1. The input voltage for each ADC interface must not exceed its corresponding voltage range.
2. It is prohibited to supply any voltage to ADC pins when VBAT is removed.
3. It is recommended to use resistor divider circuit for ADC application.
3.18. USB_BOOT Interface
The module provides a USB_BOOT pin. Pulling up the USB_BOOT to VDD_EXT before powering on the module
will force the module into emergency download mode when powered on. In emergency download mode, the
module supports firmware upgrade over USB 2.0 interface.
Table 26: Pin Definition of USB_BOOT Interface
Pin Name
Pin No.
I/O
Description
Comment
USB_BOOT
83
DI
Force the module into emergency
download mode
1.8 V power domain.
Active high.
If unused, keep it open.
The following figure shows a reference circuit of USB_BOOT interface.
Module
USB_BOOT
VDD_EXT
10K
Test point
TVS
Close to module
Figure 30: Reference Circuit of USB_BOOT Interface
3.19. GPIO Interfaces
The module provides 8 GPIOs.
ADC Sample Rate
4.8
MHz
NOTES