Telit Wireless Solutions LN940 WWAN M.2, Руководство пользователя

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USIM Interface
The USIM interface is fully compliant to the ISO/IEC 7816-3 specification
The USIM contains parameters necessary for the operation of WWAN radio
environment.
Table 3.2-1 USB 3.0 USIM Interface
Signal Name Pin Voltage
Level Description
UIM_RESET 30 1.8V UIM Reset signal
UIM_CLK 32 1.8V UIM Clock signal
UIM_DATA 34 1.8V/2.85V UIM Data signal
UIM_PWR 36 1.8V/2.85V Power source for UIM
SIM_DETECT 66 1.8V This is an indication to the
modem to detect the SIM
insertion/removal. It is
usually connected to the
SIM reader SW pin and is
card type dependent
3.2.1. SIM Design Recommendations
(1) It’s recommended to take Electrostatic Discharge (ESD) protection
measures near the USIM card socket.
(2) The USIM socket shall be placed near the NGFF interface. The length of
the traces shall not exceed 100mm.
(3) The SIM_DECECT signal is used to detect the insertion of and removal
of SIM card from SIM socket.
With a Normal Short SIM Card Connector, PUSH-PUSH type, the detect
switch is normally shorted to the ground when no SIM card is inserted.
a. When SIM card in inserted the SIM_DETECT shall transition from
Logic 0 state to Logic 1 state. The rising edge shall indicate the
insertion of SIM card.
b. When SIM card is removed from the socket the SIM_DETECT
shall transition from Logic 1 state and Logic 0 state. The falling
edge shall indicate the removal of SIM card.
c. This signal shall treat the rising or falling edge or actual logic state
as an interrupt. Once triggered the LN940 WWAN M.2 module
shall act accordingly.