Telit Wireless Solutions ME910G1, Руководство по конструкции

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ME910G1 Hardware Design Guide
1VV0301593 Rev.12
Page 34 of 93 2021-09-24
Not Subject to NDA
Power On
To turn on the ME910G1 the pad ON_OFF*/WAKE* must be tied low for at least 5 second
and then released.
The maximum current that can be drained from the ON_OFF*/WAKE* pad is 0,1 mA.
The ON_OFF*/WAKE* pad can make an asynchronous wakeup of the system from PSM
Mode, before the scheduled event of timer T3412 expired.
To make asynchronous exit from PSM mode ON_OFF*/WAKE* pin must be set to LOW for
at least 5 seconds.
Figure 5: Power-on Circuit; illustrates a simple circuit to power on the module using an inverted buffer
output.
Note: Do not use any pull up resistor on the ON_OFF*/WAKE* line, it
is internally pulled up. Using pull up resistor may bring to latch up
problems on the ME910G1 power regulator and improper power
on/off of the module. The ON_OFF*/WAKE* line must be connected
only in open collector or open drain configuration.
In this document all the lines that are inverted, so they have active
low signals are labeled with a name ending
with”#",”*” or with a bar
over the name.
To check if the device has powered on, the hardware line PWRMON
should be monitored.