Sim Pin Descriptions; Application Notes; Sim Socket Pin Descriptions - Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines

Table 4-10: USIM interface signals
Pin Name
6 EXT_VREG_USIM
7 EXT_USIM_RESET
8 EXT_USIM_DATA
9 EXT_USIM_CLK
a. See Table 4-4 on page 40 for state definitions.
Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change

4.6.1 SIM pin descriptions

Table 4-10 describes the SIM interface pins.
See Digital I/O electrical information
and reset state definitions.
I/O Reset
Type a
state
USIM power supply
USIM reset signal
USIM data
USIM clock
Note: To reduce crosstalk from clock to SIM data line, it is recommended to have 18pF on
the EXT_USIM_CLK for the eSIM-installed model of SL, and 36pF for modules without
eSIMs.

4.6.2 Application notes

See Reference schematic
4.6.2.1 SIM socket pin description
Table 4-11 describes the required SIM socket pins.
Table 4-11: SIM socket pin descriptions
Pin Signal
1
2
on page 39 for 1V8 voltage characteristics
Description
•
•
•
•
•
•
on page 40 for an implementation of the SIM interface.
Description
VCC EXT_VREG_USIM
RST EXT_USIM_RESET
Notes
1.8 V (3G) or 3 V (2G).
Maximum allowed current draw =
10 mA.

Requires 15–25 k pull-up resistor
to EXT_VREG_USIM.
Shunt capacitor in pF range may be
needed (PCB provision for
capacitor is recommended)
Typically 4 MHz at
EXT_VREG_USIM level.
Host should minimize rise time (<
50 ns) by adjusting trace capaci-
tance and filtering needs as
required
43