Specifications

LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary System description
Page 30 of 75
Figure 16: Application circuits to reset the module using a push button or using an application processor
When the module is in power-off mode or in reset state, RESET_N is pulled low (e.g. during boot sequence, a
watchdog timer, or software reset).
RESET_N can indicate to an external application that the module is powered up and is not in the reset state,
when:
RESET_N connected through a biased inverting transistor to a LED
RESET_N connected through a biased inverting and level shifting transistor to an input pin of an application
processor that will sense a low logic level when the module is powered up and is not in the reset state;
RESET_N connected through a pull-down resistor to an input pin of the application processor that senses a
high logic level (1.8 V) when the module is powered up and is not in the reset state.
Examples of application circuits are shown in the Figure 17.
Figure 17: Application circuits to sense if the module is in the reset state
LEON-G100/G200
Application Processor LEON-G100/G200
22
RESET_N
22
RESET_N
220
220 k
22 k
220 k
INPUT
Application Processor LEON-G100/G200
22
RESET_N
680 k
INPUT
LEON-G100/G200
Application Processor LEON-G100/G200
22
RESET_N
22
RESET_N
220
220 k
22 k
220 k
INPUT
Application Processor LEON-G100/G200
22
RESET_N
680 k
INPUT
LEON-G100/G200
Reset
push button
Application Processor LEON-G100/G200
22
RESET_N
22
RESET_N
12.6 k
1.88 V
12.6 k
1.88 V
LEON-G100/G200
Reset
push button
Application Processor LEON-G100/G200
22
RESET_N
22
RESET_N
12.6 k
1.88 V
12.6 k
1.88 V
12.6 k
1.88 V
12.6 k
1.88 V