Sierra Wireless WISMO218 - Manual (Page 37)

WA_DEV_W218_PTS_002 Rev 005 Page 37 of 109
Product Technical Specification &
Customer Design Guidelines
Figure 6. Example of RS-232 Level Shifter Implementation for UART2
The following table lists the recommended components to use in implementing a UART transceiver
circuitry.
Component Description/Details Manufacturer
U200 LTC2804IGN-1 LINEAR TECHNOLOGY
L200 LQH2M CN100K02L MURATA
J200 096615276119 SUBD9F HARTING
R202 NC
R204 100K 
C200 1µF
C201 220nF
C207 1µF
C208 1µF
Note: It is recommended to make SPI signals accessible for diagnostics by reserving some test points, for
example.