HUAWEI EM770 HSPA PC Embedded Module V100R001
Product Specification
Issue 1
(2008-09-15)
Huawei Confidential: This documents is Huawei Proprietary and Confidential(NDA
Required).It may not be duplicated, neither distributed externally without
prior and written permission of Huawei.
Page
27 of 68
resumed. Table 3-11 lists this requirement on the function of W_DISABLE# and the
software control setting. For example, the radio RF operation remains disabled
unless both the hardware and software are set to enable the RF features of the card.
Table 3-10
W_DISABLE_N signal
Pins Name
Description
Direction to Module
20
W_DISABLE_N
Close wireless communications
Input
Table 3-11
Radio operational states
W_DISABLE#
SW Control Setting*
Radio Operation
High
Enabled
Enabled
High
Disabled
Low
Enabled
Low
Disabled
Disabled
* This control setting is implementation specific; this column represents the collective
intention of the host software to manage radio operation.
If PC uses a hardware switch or EC(Embedded Controller) control W_DISABLE#,
3.3V VCC Main Voltage and W_DISABLE# must meet Figure 3-2 power sequences.
Figure 3-2
power sequences timing diagram
Note:
We strongly recommend controlling this pin via hot-keys or a hardware switch. There are three
points as bellow:
1. If we don
’
t turn off radio manually, radio will be on when module is powered on.
2. End users need turn off radio at some situation like on an airplane.
3. According to Mini-PCIE specification, we must turn off radio through hardware or software.
Nearly all PC companies obey this specification.
3.2.6
LED_WWAN# Signal
The LED_WWAN signal of the EM770 can tolerate up to the voltage of 5 V and
absorb the current up to150 mA. According to the given circuit, in order to reduce the
current of the LED, a resistance of 1 k
Ω
must be placed in series with the LED.
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