BandRich BandLuxe M280 Series, Руководство пользователя

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BandLuxe
®
M280 Series HSUPA Module Datasheet
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system (Figure 2-4), the module shall disable radio operation. All transients resulting from mechanical switches need
to be de-bounced by host system circuitry.
In normal operation, the module will disassociate with the wireless network and cease any further operations
(transmit/receive) as soon as possible after the W_DISABLE# signal is asserted. Given that a graceful
disassociation with the wireless network fails to complete in a timely manner, the module shall discontinue any
communications with the network and assure that its radio operation has ceased no later than 30 seconds following
the initial assertion of the W_DISABLE# signal. Once the disabling process is complete, the WWAN LED shall
indicate the disabled condition to the host.
To reduce power consumption in the above mode, the module would further get into sleep (power saving) mode to
turn off Baseband functionality except Real-Time-Clock circuitry and SDRAM self-refresh.
The module would initiate resuming normal operation when host de-asserts the W_DISABLE# signal.
Table 2-5 Radio Operational States
W_DISABLE# Radio Operation
De-asserted Enabled (RF operation allowed)
Asserted Disabled (no RF operation allowed)
The host system is required to assure that W_DISABLE# be in a deterministic state (asserted or de-asserted)
whenever power is applied to the module.
Figure 2-4 System Sleep Mode On/Off Level-Trigger
2.6.3 PERST#
The PERST# signal is a level trigger signal used by the host system to force a warm rest of the module. The
PERST# is normally de-asserted (high) to indicate when the system power sources are within their specified
voltage tolerance and are stable. The host system can force a hardware reset on the module via asserting (driving
low) PERST# signal for more than 1 second. Afterwards the host system must pull back the PERST# signal to
high level and the module will continue the reset process and return to normal operation. PERST# signal will
also be asserted when power is switched off.
This PERST# signal is an optional feature. The module will reset itself during the power-on process, and the host
doesn’t need to reset the module.
Figure 2-5 Module Reset