Huawei MU739 Hardware Manual page 25

HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
Table 3-4 Power on timing
Parameter
T
ON1
T
ON2_N
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
W_DISABLE_N
W_DISABLE_N
PWRDWN_N
The PWRDWN_N pin is used to reset the system.
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
PWRDWN_N
Issue 01 (2011-08-24)
Comments
ON1 turn on time.
ON2_N turn on time
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

Supply Design Guide.
RF ON
RF OFF
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Time (Min values)
40
40
RF OFF
RF ON
. If the software of the MU739 module
20 ms
Units
µs
µs
HUAWEI Module Power
25