Specifications

Digi m10 Hardware Reference v 1.20
Digi International, Inc. © 2009
Page 20 of 36
3.2.1 Power Design
3.2.1.1 Power Supply
The Digi m10 operates on a single unregulated power source of 9 V to 18 V DC (nominal 12
V) supplied through the pins of the host connector. The Power ON / OFF control circuit is
outside the Digi m10 and is controlled by host controller.
 Low: OFF state
 High: ON state
The Digi m10 does not have reverse polarity protection. Therefore, ensure that only
positive voltage is supplied to avoid damaging it.
3.2.1.2 Typical Power Consumption
The typical current consumption is as follows:
 Transmitting: ~1.5A at 12V nominal input power, when the RF Module is
transmitting at 5 W output power.
 Receiving: 70mA to 80mA at 12Vnominal input power when searching for or
continuously receiving the satellite signal.
 Powering-down: <3 μA at 12 V when the Digi m10 is in the OFF state.
The input supply for the Digi m10 should be in the range of 9 V to 18 V and the input supply
should be able to source up to 2 A.
The Digi m10 does not need a constant 2 A current. Instead, 2 A will be consumed as
pulsed current when the RF transmit is in progress. The power supply must be able to
source 2 A instantaneously (<100 µs), otherwise communications will fail. m10 supply
voltage ripple should be maintained below 0.3V and supply trace resistance below
0.15ohms.
The transmitter ON time can vary from 3.3 milliseconds to 4.8 seconds respectively.