Huawei ME909u-521 - Power Interface; Overview; Power Supply VBAT Interface

HUAWEI ME909u-521 LTE LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 05 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
25

P indicates power pins; I indicates pins for digital signal input; O indicates pins for digital
signal output; PO indicates power output pins; PI indicates power input pins.

V
IL
indicates Low-level Input voltage; V
IH
indicates High-level Input voltage; V
OL
indicates
Low-level Output voltage; V
OH
indicates High-level Output voltage.

The NC pins are not connected, therefore, before you deal with these pins, please refer to
the corresponding hardware guide.

The Reserved pins are internally connected to the module. Therefore, these pins should not
be used, otherwise they may cause problems. Please contact with us for more details about
this information.
3.3 Power Interface
3.3.1 Overview
The power supply part of the ME909u-521 module contains:

VBAT pins for the power supply

VCC_EXT1 pin for external power output with 1.8 V

USIM_VCC 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
12 and 13
VBAT
PI
Pins for power
voltage input
-
3.3
3.8
4.2
-
48–50, 52–54,
56–59, 106,
108, 110 and
112
GND
-
Ground
-
-
-
-
-
32
VCC_EXT1
PO
Pin for external
power output
-
-
1.8
-
-
34
USIM_VCC
PO
Power supply
for USIM card
-
-
1.8/2.
85
-
-
121–145
GND
-
Thermal
Ground Pad
-
-
-
-
-
3.3.2 Power Supply VBAT Interface
When the ME909u-521 module works normally, power is supplied through the VBAT
pins and the voltage ranges from 3.3 V to 4.2 V (typical value: 3.8 V). The 145-pin
LGA provides 2 VBAT pins and 41 GND pins for external power input. To ensure that
the ME909u-521 module works normally, all the pins must be used efficiently.