Wavenet Technology Pty Ltd. BM3900M 用户手册
Installation________________________________________________ Boomer-III User Manual & Integrator’s Guide
Copyright Wavenet Technology © October 2003
48
BM310012WT05
Power Down Diagram Callouts
1
HOSTPWR_ON is de-asserted from the host/terminal to the
modem.
modem.
Important: The power rail must be present for up to ten seconds
(typically two seconds) after HOSTPWR_ON is de-asserted for the
deregistration process to complete orderly.
(typically two seconds) after HOSTPWR_ON is de-asserted for the
deregistration process to complete orderly.
2
The modem starts the soft shutdown process. The battery status
indicator pulses quickly until the shutdown steps are complete.
The modem initiates the deregistration process from the network
and upon completion de-asserts DSR and DCD. DCD signifies
network detachment, and DSR shows the modem’s readiness state.
indicator pulses quickly until the shutdown steps are complete.
The modem initiates the deregistration process from the network
and upon completion de-asserts DSR and DCD. DCD signifies
network detachment, and DSR shows the modem’s readiness state.
3
After deregistration, the internal modem CPU power-on signal is de-
asserted. This deactivates the internal modem power rail to the
radio.
asserted. This deactivates the internal modem power rail to the
radio.
4
At this point you can optionally de-asset HOSTPWR_ON signal to
the modem and assert the HCRESET line to the modem.
the modem and assert the HCRESET line to the modem.
Batteries
The Boomer-III OEM Modem may be powered by batteries if used
with a handheld device.
For battery operated devices, battery selection is a critical decision,
requiring consideration of many factors. These include cell size,
internal impedance, charging requirements, and susceptibility to
common battery phenomena, such as memory effect or overcharging.
Each of these factors is discussed in detail in this section.
The selected battery must be able to meet the Boomer-III power
requirements as mentioned previously.
Three prevailing battery technologies exist today:
The Boomer-III OEM Modem may be powered by batteries if used
with a handheld device.
For battery operated devices, battery selection is a critical decision,
requiring consideration of many factors. These include cell size,
internal impedance, charging requirements, and susceptibility to
common battery phenomena, such as memory effect or overcharging.
Each of these factors is discussed in detail in this section.
The selected battery must be able to meet the Boomer-III power
requirements as mentioned previously.
Three prevailing battery technologies exist today:
Nickel cadmium (NiCad) batteries may be used for devices
requiring wide temperature ranges.
requiring wide temperature ranges.
Nickel metal hydride (NiMH) and
Lithium ion (Li+) batteries may also be used for devices utilised
above 0ºC. Specifications for these batteries should be obtained
from the manufacturer.
above 0ºC. Specifications for these batteries should be obtained
from the manufacturer.
NiCad
Most mature technology
Lower energy density (energy/volume) than NiMH or Li-ion
Available in all cell sizes, including AA, 2/3A, 4/5A, A, 4/3A,
and so on. This represents the greatest number of packaging
options.
and so on. This represents the greatest number of packaging
options.
Exhibits a memory effect when not occasionally discharged
below the lower extent of its operating voltage. The memory
effect reduces the usable capacity of each battery cell.
below the lower extent of its operating voltage. The memory
effect reduces the usable capacity of each battery cell.