LE915Ax-P
Hardware Design Guide
1VV0301680 Rev. 2
Page 28 of 51
2021-10-04
Not Subject to NDA
Note: If the application requires SIM card insertion or removal support,
the SIM card handler must include a removal/insertion pad detector to
allow the module firmware to process the event immediately. The
default SW configuration is to support SIM_DETECT.
If t
he SIM holder doesn’t have a SIM detect switch, it is required to keep
HIGH the SIM_DETECT port to avoid floating and to ensure that the SIM
is always detected as present.
A typical interface circuit is shown below. It is recommended to keep the traces between
the module and the SIM holder as short as possible to prevent noise pick up and potential
interferences affecting the radio performance.
Figure 9: Typical SIM interface circuit
Reserved Pins
Two input pads of HW identifier and one for operation mode setting are reserved.
Table 17: Reserved pins
Pin
Signal
I/O
Function description
7
HWID1
I
This signal shall be 1.8V pull-up.
6
HWID2
I
This signal shall be 1.8V pull-up.
80
FFF_FFH
I
Set HIGH for normal operation mode. This shall be 1.8V pull-up.
