User's Manual

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 38 / 94
3.8. Reset the Module
The RESET_N pin can be used to reset the module.The module can be reset by driving RESET_N to a
low level voltage for time between 150ms and 460ms.
Table 8: RESET_N Pin Description
Pin Name Pin No. Description DC Characteristics Comment
RESET_N 20 Reset the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
The recommended circuit is similar to the PWRKEY control circuit. An open drain/collector driver or button
can be used to control the RESET_N.
Reset pulse
RESET_N
4.7K
47K
TBD
Figure 14: Reference Circuit of RESET_N by Using Driving Circuit
Figure 15: Reference Circuit of RESET_N by Using Button