User's Manual

32 Power requirements: Batteries
Integrator’s Guide – RIM 902M OEM Radio Modem
Radio load profile (at 4.5V)
Transmitter ON
at 2.00 W to antenna
worst-case peak instantaneous (due to extreme
temperature, poorly matched antenna, etc.)
1.7 A
2.2 A
Receiver ON
In EXPRESS mode, the receiver is always ON.
In POWERSAVE mode, the receiver is typically
ON for 0.15 s then OFF for 9.85 s
57 mA
Standby (transmitter and receiver are both OFF)
Standby mode occurs for 9.85 s out of 10 s if in
POWERSAVE mode and no activity has taken
place for previous 10 s
0.2 mA
to
5.4 mA
Typical average power-save current consumption
transmit 0.17%, receive 9.74%, standby 90.09%
transmit 1%, receive 5%, standby 94%
5.7 mA
20.0 mA
Transmit duration
minimum
maximum
32 ms
1 s
Off current consumption
d 20 P A
Batteries
When integrated into a handheld device, the RIM 902M can be powered by
batteries. This is a proven technology that is easily available and eliminates the
need for power supply components such as voltage regulators.
Rechargeable batteries
We recommend using rechargeable nickel cadmium (NiCad) batteries to power
vthe RIM 902M radio modem for battery-operated applications that require a
wide operating temperature range. Nickel metal hydride (NiMH) and Lithium
ion (Li+) cells may also be used with good results, but many such cells do not
work very well at temperatures below freezing. Specifications for batteries