Specifications

L70 Hardware Design
L70_HD_V1.0 - 17 -
3.5. Turn on and Turn off
3.5.1. Turn on
The module will be turned on when VCC is supplied.
3.5.2. Turn off
Shutting down the module's main power supply is the only way to turn off the module. In this case, if
the backup power is still present, the module will enter the backup mode.
3.5.3. Restart
L70 module can be restarted by driving the VRESET to a low level voltage for a certain time and then
releasing it. An OC driver circuit as shown below is recommended to control the VRESET.
4.7K
47K
VRESET
Input pulse
Figure 3: Reference reset circuit using OC circuit
The other way to control the VRESET pin is using a button directly. A TVS component needs to be
placed close to the button for ESD protection. While pressing the key, ESD strike may generate from
finger. A reference circuit is illustrated in Figure 4.
S1
VRESET
TVS1
Close to S1
Figure 4: Reference reset circuit using button
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