User's Manual
Table Of Contents
- Copyright
- Attention
- Trademark
- Versions
- Applicable Model List
- Foreword
- Product Overview
- Structure
- Hardware Introduction
- Hardware Interface
- Electrical and Environmental Characteristic
- RF Interface
L811-EA Module Hardware User Manual Page
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(1.8-1)*C/2 + (1-0.4)*C/1 = 0.4C + 0.6C = 1C
Ex.
When using a 100uF capacitor, the remaining time is 1*100 = 100 Sec.
When using a 330uF capacitor, the remaining time is 1*330 = 330 Sec.
If the RTC backup power function is not required, the VRTC pin can be left floating.
5.2 Power on/off and Reset Signal
The L811-EA module provides two control signals for power on/off and reset functions.
Pin definition as shown in the following tables:
Pin#
Pin Name
Electrical Level
Description
N8
POWER_ON/OFF#
CMOS 1.8V
Power on/off signal
N7
RESET_N
CMOS 1.8V
External reset signal input, active low.
5.2.1 Power on /off Signal
5.2.1.1 Power on
After the power is applied to the module, pull up the POWER_ON/OFF# signal for at least 20ms then the
module will boot up.
The timing sequence diagram as follows:
Figure 5- 2 Power on Timing Control Diagram
Note :
The “>1s” time starts from the external capacitor being charged when the power is applied to the module.
If VBAT is already applied to the module then the time can be ignored, and AP(Application Processor)