User's Manual

Shenzhen Neoway Technology Co., Ltd. Page 17 of 32
Figure 10 Reference circuit for ON/OFF control
Reference Components:
Q1: MMBT3904, or to use digital transistor with bias resistors built in, like DTC123/114
The combination of R3 and R4, should limit the high voltage of ON/OFF less than 3.0V.
Note:
 If the host itself is not initialized before turning on the module, some abnormal conditions on
IO or UART may affect the power on procedure.
 The better way to rescue the module from abnormal condition, is to apply a power OFF-ON
procedure, rather than using the ON/OFF control signal. In fact ON/OFF signal is
software-dependent.
6.2.3 RESET
Pull the RESET signal to low level for at least 60mS to reset the module. A pull-up resistor is
internally included. Reset pin can be left open if not used.
6.2.4 VCCIO
VCCIO is provided to power the level translators, with a 2.8V / 5mA output.
VCCIO can also be used to monitor the on/off state of module. It outputs 2.8V high level while the
module is on, and low level while the module is off.