Xim Notes Of Operation; Figure 34: Ruim Application Interface - Sierra Wireless MC5720 Hardware Integration Manual

Figure 10: RUIM application interface
4.7uF
located near
SIM socket
RUIM/SIM card
connector

XIM notes of operation

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•
•
•
Rev 1.2
A p r - 0 5
X5R
typ
pin 1
RUIM_PWR
pin 3
RUIM_CLK
0 ohm
pin 4
RUIM_IO
0 ohm
pin 2
/RUIM_RESET
0 ohm
pin 8
GND
ESD
protection
To save power, the XIM interface should be powered down when not in use.
XIM is specified to run up to 5 MHz (XIM clock rate). Take note of this
speed in the placement and routing of the XIM signals and connectors.
To protect the modem CPU, ESD protection is required for XIM_CLK,
XIM_IO, /XIM_DETECT (if used), and /XIM_RESET lines. Additionally
spaces for possible series resistors should be added to the layout. Possible
values of up to 470 ohm may be used depending on ESD testing
requirements.
It is recommended to put a placeholder capacitor near the SIM socket. The
longer the trace length (impedance) from the socket to the MiniCard, the
greater the capacitance requirement will be to meet compliance tests.
P r o p r i e t a r y a n d c o n f i d e n t i a l
H o s t I n t e r f a c e
XIM_VCC
XIM_CLK
XIM_IO
/XIM_RESET
GND
MCXXXX
located near
SIM socket
3 5