Huawei ME906s LTE M.2, Руководство по оборудованию

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HUAWEI ME906s LTE M.2 Module
Hardware Guide
Description of the Application Interfaces
Issue 05 (2019-03-25)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
19
3.3 Power Interface
3.3.1 Overview
The power supply part of the ME906s module contains:

3.3V pin for the power supply

USIM_PWR pin for USIM card power output
Table 3-2 lists the definitions of the pins on the power supply interface.
Table 3-2 Definitions of the pins on the power supply interface
Pin No. Pin Name
Pad
Type
Description Parameter
Min.
(V) Typ.
(V) Max.
(V)
Comments
2, 4, 70, 72, 74 3.3V PI Power supply - 3.135 3.3 4.4 -
36 USIM_PWR PO USIM POWER
- 1.75 1.8 1.98
USIM_PW
R=1.8 V
- 2.75 3 3.3
USIM_PW
R=3.0 V
3, 5, 11, 27,
33, 39, 45, 51,
57, 71, 73
Ground PI Ground - - 0 - -
3.3.2 Power Supply 3.3V Interface
The ME906s module power is supplied through the 3.3V pins and the voltage ranges
from 3.135 V to 4.4 V (typical value is 3.3 V). The ME906s provides 5 power pins and
11 GND pins. To ensure that the ME906s module works normally, all the pins must be
connected. The M.2 connector pin is defined as that should support 500 mA/Pin
continuously.
When the ME906s module works at GSM mode, the module transmits at the
maximum power, the transient peak current may reach 2.5 A@3.3 V. In this case, the
power pin voltage will drop. Make sure that the voltage does not drop below 3.135 V
in any case.
The traces of the power supply should be as short and wide as possible. It is
recommended that at least one 220
μF capacitance is added onto the 3.3V power
rails and as close to the M.2 connector as possible. Customers can reduce the
capacitance if it can be guaranteed that the 3.3V pin does not drop below 3.135 V in
any case.
Figure 3-2 shows the recommended power circuit of ME906s module.