HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 01 (2011-08-24)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
25
Table 3-4
Power on timing
Parameter Comments
Time (Min values)
Units
T
ON1
ON1 turn on time.
40
µs
T
ON2_N
ON2_N turn on time
40
µs
Since the ON1 is high active and ON2_N is low active, you could choose one of these two
pins during design.
For detailed information about power supply design, see the
HUAWEI Module Power
Supply Design Guide.
W_DISABLE_N
Low active signal.
When W_DISABLE_N Is low (asserted), the RF will be turned OFF.;
When W_DISABLE_N is high (de-asserted), the RF will be turned ON.
Figure 3-6
W_DISABLE_N timing
PWRDWN_N
The PWRDWN_N pin is used to reset the system.
. If the software of the MU739 module
fails responding, you can reset the hardware through the PWRDWN_N signal as
shown in Figure 3-7 .When a low-level pulse is supplied through the PWRDWN_N pin
for about 20 ms, the module will be put into the initial state. Then the software can
start powering on the module and reports relevant information according to the actual
settings.
Figure 3-7
Power down pulse timing
W_DISABLE_N
W_DISABLE_N
RF ON
RF ON
RF OFF
RF OFF
20 ms
PWRDWN_N
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