Huawei ME909s-821 - 3.6 USB Interface

HUAWEI 30 mm × 30 mm LGA Module
Hardware Migration Guide
LGA Interface Differences
Issue 08 (2016-12-12)
HUAWEI Proprietary and Confidential
Copyright © HUAWEI Technologies Co., Ltd.
24
Figure 2-6 Connections of the USIM_DET pin
Module
(Modem)
BB Chip
1.8V
USIM_DET
470 pF
USIM Deck
CD
If USIM card is absent, the CD connects to Ground.
If USIM card is present, the CD is open.
CD is a pin detecting of USIM in the USIM socket, in normal, there will be a detect pin
in the USIM socket.
W_DISABLE
Pin 45 works as the W_DISABLE signal by normalization. The MC509 supports this
function. MU609, ME209u-526, MU709 and ME909u are now planning this pin for
W_DISABLE signal, while this pin is GPIO for MU509.
This signal requires an external pull-up resistor, which should be pulled up to
VCC_EXT1 (pin 32) or VCC_EXT2 (pin 31). The signal level differs between 30mm ×
30mm LGA modules. Therefore, the MC509 uses pin 31 to provide the pull-up power
supply and the MU609/ME209u-526/ME909u/MU709/ME909s uses pin 32 to provide
the pull-up power supply. The reference circuit diagram is shown in the following
figure. A transistor is required to separate this signal from the host control signal.
Table 2-6 Differences of W_DISABLE interface
Pin
No.
Interface
Name
MU509
MC509
MU609
ME209
u-526
ME909u
MU709
ME909s
45
Control
W_DISABLE
GPIO
CMOS 2.6 V
CMOS
2.6 V
Reserved