Specifications

Digi m10 Hardware Reference v 1.20
Digi International, Inc. © 2013
Page 14 of 38
Figure 4: Timing Diagram for Powering Up
The delay between PWR_EN going high with respect to VCC going high is not critical. Digi
International recommends a 10 milliseconds delay.
2.4.2 Powering Down
The host controller can power down the m10 by setting the PWR_EN pin to LOW. The host
controller can leave the supply voltage for Digi m10 ON, or remove it at its discretion. If the supply
is left ON with PWR_EN set to low, the Digi m10 will be powered down. However, it will consume
a leakage current of less than 3 µA. The timing diagram of the Digi m10's power down sequence
is shown in
Figure 5.
Figure 5: Timing Diagram for Powering Down
It is the responsibility of the host controller to back up all messages, reports,
GlobalGrams, etc. before powering down the Digi m10.
2.5 DA (Data Available)
The Data Available signal is an active high signal. It is normally low and is driven high when the
Digi m10 receives messages, user commands, or Global Grams from the satellite. The signal