Huawei MU509 Hardware Migration Manual page 24

HUAWEI 30 mm × 30 mm LGA Module
Hardware Migration Guide
Figure 2-6 Connections of the USIM_DET pin
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 Interface Name
No.
45 Control W_DISABLE
Issue 08 (2016-12-12)
Module
1.8V
(Modem)
BB Chip
MU509 MC509
GPIO CMOS
2.6 V
CMOS 2.6 V
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Copyright © HUAWEI Technologies Co., Ltd.
USIM_DET
470 pF
MU609 ME209 ME909u
u-526
Reserved
LGA Interface Differences
USIM Deck
CD
ME909s
MU709
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