Huawei MU509 Hardware Migration Manual page 23

HUAWEI 30 mm × 30 mm LGA Module
Hardware Migration Guide
Figure 2-5 The recommended connection of the SLEEP_STATUS pin
USIM_DET
MU709/ME909s support USIM hot swap function.
MU709/ME909s provide an input pin (USIM_DET) to detect whether the USIM card is
present or not. This pin is a level trigger pin, and it is internally pulled up. If the
module does not support USIM card hot swap, keep USIM_DET floating.
Table 2-5 Function of the USIM_DET pin
No.
1
2
Issue 08 (2016-12-12)
R8 depends on the actual DTE requirements.
USIM_DET Function
High level USIM card insertion.
If the USIM card is present, USIM_DET should be High.
Low level USIM card removal.
If the USIM card is absent, USIM_DET should be Low.
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LGA Interface Differences
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