LXE MX7 Tecton CE Reference Manual page 215

Power
Because of the cumulative effect, and using the Battery Power Scheme Defaults listed above:
The backlight turns off after 3 seconds of no activity,
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The display turns off after 18 seconds of no activity (15 sec + 3 sec),
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And the device enters Suspend after 5 minutes and 18 seconds of no activity.
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If the User Idle timer is set to Never, the power scheme timers never place the device in User Idle, System Idle or Sus-
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pend modes.
E-EQ-MX7CERG-A [ 203 ] MX7 Tecton™ CE Reference Guide