Huawei EM770 - Power Sources and Grounds; USB Signals; USIM Signals

HUAWEI EM770 HSPA PC Embedded Module V100R001
Product Specification
Issue 1
(2008-09-15)
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Required).It may not be duplicated, neither distributed externally without
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3.2.2 Power Sources and Grounds
The PCI Express Mini Card provides two power sources: one is 3.3Vaux (3.3 Vaux)
and the other is 1.5V (+ 1.5 V). For the EM770, +3.3Vaux is the only supply voltage
available. The input voltage is 3.3 V ± 9%, as specified by PCI Express Mini CEM
Specifications 1.2.
Table 3-3 Power and ground specifications
Name Pins Minimum Type Maximum
VCC 2, 39, 41, and 52 3.0 V 3.3 V 3.6 V
GND 4, 9, 15, 18, 21, 26, 27, 34, 35,
37, 43, and 50
0 V
3.2.3 USB Signals
The EM770 is compliant with USB 2.0 specification. It supports full-speed and high-
speed when acting as a peripheral and supports low-speed, full-speed, and high-
speed when acting as a host. The USB 2.0 specifications allow peripherals to support
any one or more of these speeds.
Table 3-4 USB pins
Name Pin Description Direction to Module
USB D- 36 USB data signal D- Input/Output
USB D+ 38 USB data signal D+ Input/Output
The USB interface is powered directly from the 3.3 V supply. The USB input/output
lines are compatible with the USB 2.0 3.3 V signal specifications.
Table 3-5 USB signal DC characteristics
V
OH
min V
OL
max V
IH
min V
IL
max
2.8V 0.3V 2V 0.8V
3.2.4 USIM Signals
The USIM is a smart card for UMTS/GSM cellular applications. The USIM provides
the required subscription information to allow the mobile equipment to attach to a
GSM or UMTS network. The USIM also provides the subscriber's verification
procedures as well as authentication methods for network authentication during the
attach procedures.
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