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L10 Hardware Design
USB Device
connector
Note: The USB interface is not recommended to output NMEA message to USB port of the host, such
as ARM processor because the driver of USB may be not reliable. If don't use the USB port, please
connect VDDUSB to GND.
3.9 Software upgrade
The UART port and USB port can be used for firmware upgrade, and one of them should be selected.
3.10 EXTINT0
The EXTINT0 pin is an external interrupt input pin. It is an edge trigger interrupt and can be used to
wake up the module from the standby mode. When the EXTINT0 pin is changed from high to low, the
module will enter the standby mode. When the EXTINT0 pin is changed from low to high, the module
will exit from standby mode.
Table 10: Pin definition of the EXTINT0
Name
Pin
EXTINT0
27
3.11 AOK
AOK can output antenna status message. It outputs a low level when the active GPS antenna is
assembled and operating normally. When the GPS antenna is not assembled or short-circuited, it outputs
a high level to indicate to the host controller.
Table 11: Pin definition of the AOK
Name
Pin
AOK
12
L10_HD_V1.01
5V
VBUS
DP
DM
GND
Figure 10: USB interface circuit
Function
External interrupt input
Function
Active GPS antenna status indication
MODULE
LDO
VDDBUS
3.3V
USBDP
USBDM
GND
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