BandLuxe
®
M280 Series HSUPA Module Datasheet
15
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USIM_CLK and USIM_RST signal, include 33pF filter capacitors is required to be placed near the SIM
connector.
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Route all USIM signals carefully – isolate them from sensitive analog and RF signals.
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External ESD diodes are necessary to protect the chip on the module; the ESD diodes should be placed
near the connector.
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Refer to the reference circuits below:
Figure 2-3
USIM Circuits Reference
VREG_USIM
0.1uF
10%
10V
33pF
5%
25V
10K
5%
1/16W
SIM Slot
USIM_P_RESET
0R
USIM_P_CLK
0R
VCC
RESET
CLK
GND
VPP
DATA
USIM_P_DATA
0R
Varistor
3pF
3pF
40pF
40pF
2.6
Auxiliary Signals Interface
2.6.1
WAKE# (Optional)
The WAKE# signal is an open drain, active low signal that is driven low by the module to reactivate the host.
The M280V module would pull WAKE# down for 250ms to send the interrupt to host when it had received a
mobile terminated voice call. This auxiliary signal interface is reserved for future use for M280 module.
If the wakeup process is used, the Vcc supply must be present and used for this function. The assertion and de-
assertion of WAKE# are asynchronous to any system clock. If implemented in the host platform, a host pull-up
resistor (
≥
5 k
Ω
) tied to no higher than Vcc is required on this pin.
2.6.2
W_DISABLE#
Active low signal used by the system to disable radio operation on the module. The W_DISABLE# signal is
provided to allow users to disable, via a system-provided switch, the module’s radio operation in order to meet
public safety regulations or when otherwise desired.
The W_DISABLE# signal is an active low, level trigger signal that when asserted (driven low) by the host
