Specifications

LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary System description
Page 29 of 75
VCC
V_BCKP
LDOs
RESET_N
System State
BB Pads State
ON
Operational
Tristate
OFF
Turn-off
triggered
Figure 15: Power off sequence description
1.6.3 Module reset
Reset the module using RESET_N: this performs an external or hardware reset. When RESET_N pin is driven to
low, the device is initialized into a defined reset state. An asynchronous reset of the entire module - except for
the RTC - is triggered.
The electrical characteristics of RESET_N are different from the other digital I/O interfaces. The high and the low
logic levels have different operating ranges and the pin is tolerant to voltages up to the battery voltage (a series
protection diode is mounted inside the module to protect the pin). The detailed electrical characteristics are
described in the LEON-G100/G200 Data Sheet [1].
RESET_N is pulled high by an integrated pull-up resistor, therefore an external pull-up is not required on the
application board. An internal circuit pulls the level to 1.88 V (see Figure 16).
Force the RESET_N input pin to the low level for at least 50 ms to cause an external reset of the module. When
the RESET_N is released from the low level, the module automatically starts its power-on reset sequence.
If RESET_N is connected to an external device (e.g. an application processor on an application board) an open
drain output can be directly connected without any external pull-up. Otherwise, a push-pull output should be
used. Make sure to fix the proper level on RESET_N in all possible scenarios, to avoid unwanted reset of the
module.
The reset state of all input-output pins is reported in the pin description table in the LEON-G100/G200 Data
Sheet [1].