ML8011 GSM GPRS Modem User’s Manual
Page 8
preferable for its better efficiency especially with the 2.0A peak current in burst mode of the
module.
Figure 2 recommend Power supply
3.4 Power up and power down scenarios
3.4.1 Power On
Customer
’
s application can turn on the module by driving the pin PWRKEY to a high 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. If the
STATUS pin is ignored, pull the PWRKEY pin to high level for more than 2 seconds to turn on
the module. The power on timing is illustrated as following figure 3.
Figure 3 Timing of turn on the module
①
Ensure the VBAT voltage stability before driving the pin PWRKEY to a high level voltage.
Recommend at least time intervals of 30 ms.
Note
: The module is set to auto baud rate mode (AT+IPR=0) in default configuration. In the auto
baud rate mode, the URC
“
RDY
”
after powering on is not sent to host controller. AT command