Motus Reference Manual
Page 79 of 146
Version 1.1
29/11/2019
Pin
Function
1
Supply Voltage
2
Ground
3
Supply Voltage
4
Ground
5
Supply Voltage
6
Ground
7
3.3V translator supply, see section 13.2.1
8
Ground
9
Primary UART receive
10
Reset line, see section 13.2.2
11
Primary UART transmit
12
GPIO1
13
No connection
14
GPIO2
15
No connection
16
Auxiliary UART transmit
17
No connection
18
Auxiliary UART receive
19
No connection
20
No connection
Table 19: Pin allocation table
13.2.1
Interoperability with Different Voltage Systems
All signals are 3.3 volt level, however inputs are tolerant to 5 volt signals from the
target interface. If you require a different voltage level to be compatible with your
target system it is recommended that you install a voltage level translator between
the signals of each device. To power the translator 3.3V is provided on pin 7 of the
Motus OEM connector. This supply is only capable of driving up to 25mA and should be
appropriately decoupled when powering a circuit.
13.2.2
Reset Line
The reset line is internally pulled high on Motus OEM. This pin must be left floating for
normal operation. If a user wishes to reset Motus OEM the pin can be pulled low
externally to force a reset. It is important that this signal is not driven high under any
circumstances as it will prevent the Motus OEM from functioning correctly. Please keep
the reset line track length to a minimum to avoid noise.
