Specifications

M80 Hardware Design
M80_HD_V1.0 - 35 -
receive data depends on the level of RTS and CTS. Then whenever hardware flow is present or not,
the URC “RDY” is sent to host controller in the fixed band rate.
3.4.1.1. Power on module using the PWRKEY pin
Customer’s application can turn on the module by driving the pin PWRKEY to a low level voltage
and after STATUS pin outputs a high level, PWRKEY pin can be released. Customer may
monitor the level of the STATUS pin to judge whether the module is power-on or not. An open
collector driver circuit is suggested to control the PWRKEY. A simple reference circuit is
illustrated in Figure 6.
Turn on pulse
PWRKEY
4.7K
47K
Figure 6: Turn on the module using driving circuit
The other way to control the PWRKEY is using a button directly. A TVS component is
indispensable to be placed nearby the button for ESD protection. When pressing the key,
electrostatic strike may generate from finger. A reference circuit is showed in Figure 7.
S1
PWRKEY
TVS1
Close to S1
Figure 7: Turn on the module using keystroke
The power-on scenarios is illustrated as the following figure.
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