
Hardware Interfaces
A DIVISION OF TRIMBLE
22 Hardware Overview
Control Signal Specification
The module communicates to a host processor via a TTL logic level UART serial port or
via a USB port. Both ports are accessed on the Molex connector or edge vias. The TTL
logic level UART supports complete functionality. The USB port supports complete
functionality except the lowest power operational mode.
Note
Power Consumption specifications apply to control via the TTL UART.
Micro Digital Connector Signal Definition
Edge Via
Pin #
Molex
53748-0208
Pin #
Signal
Signal
Direction
(In/Out of
Micro)
Notes
1-15, 21, 23,
29, 31
5-8 GND P/S Return Must connect all GND pins to ground
25, 27 1-4 Vin P/S Input 3.5 to 5.25VDC. Must connect all Vin
supplies.
22 11 GPIO1 Bi-directional Input 5VDC tolerant, 16mA Source/
Sink
24 13 GPIO2 Bi-directional
28 15 UART_RX_TTL In
26 17 UART_TX_TTL Out
18 14 USB_DM Bi-directional USB Data (D-) signal
16 12 USB_DP Bi-directional USB Data (D+) signal
20 9 USB_5VSENSE In Input 5V to tell module to talk on USB
19 19 SHUTDOWN In • HIGH or Open Circuit to ENABLE
module
• LOW or Ground to SHUTDOWN
17 20 RESET Bi-directional
• HIGH output indicates
Boot
Loader is running
LOW output indicates Application
Firmware is running
30 U.FL Antenna 1 Bi-directional U.FL connector closest to the Molex
connector
32 U.FL Antenna 2 Bi-directional U.FL connector closest to the mod-
ule’s edge
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