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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

RESET_N

220

220 k

22 k

220 k

INPUT

Application Processor LEON-G100/G200

RESET_N

680 k

INPUT

LEON-G100/G200

Application Processor LEON-G100/G200

RESET_N

220

220 k

22 k

220 k

INPUT

Application Processor LEON-G100/G200

RESET_N

680 k

INPUT

LEON-G100/G200

Reset

push button

Application Processor LEON-G100/G200

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

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

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