LE940B6 HW User Guide
Rev. 2.02
Page 54 of 111
2020-01-10
5.3.3.
Unconditional Hardware Reset (RESET_N)
To unconditionally restart the LE940B6 module, the RESET_N pad must be tied low in the
range 1300 - 1800 milliseconds and then released.
Figure 9 shows a simple circuit for this action.
Figure 9: Circuit for Unconditional Hardware Reset
GND
R1
R2
Q1
Unconditional
Reset Impulse
1300ms < Hold Time < 1800ms
RESET_N
NOTE:
The Unconditional Hardware Reset must always be implemented on the
boards, but the software must use it only as an emergency exit procedure,
and not as a normal power-off operation.
NOTE:
Do not use any pull-up resistor on the RESET_N line or any totem pole
digital output. Using a pull-up resistor may cause latch-up problems on the
LE940B6 power regulator and improper functioning of the module. The
RESET_N line must be connected only in an open-collector configuration.
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