SEW290 WCDMA Module
14
Power-on
The module could be turned on in the following method.
After the module is powered off, and then provide a 3000-4000ms low level pulse to ON/OFF PIN.
Power-off
To turn off the module, provide a 3000-4000ms low level pulse to ON/OFF PIN as the module is powered on.
V_MSME_1V8
SEW290 contains V_MSME_1V8 pin with limiting regulator function to supply power to the module external
circuit.
The voltage of this pin with the BSP and Memory comes from the same voltage regulator.Only when the
module is powered on,this pin has voltage output.the normal output voltage is 1.8V.
User should active the
current of this pin as little as possible(usually less than 10mA).
Generally,it's suggested that this pin used for Chip pins level matching demand pullup.
In order to ensure that the module data can be kept safely and for module data security, do not Cut off the power
supply when module is running.User should use the ON/OFF pin or AT commands for ON/FF operation.
4.2.2
Reset
You could turn off the module firstly and then turn it on to reset the module when the module software stops
responding.
Provide a 50~200ms low level pulse to the /PON_RESET pin as the module can reset.
Please refer to figure 4-1 for the module reset external circuit.
figure 4-1 Module reset external reference design circuit
