Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 246)

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246 Rev. 1.3
Figure 42. Test the Prototype Si3018/10 Circuitry
Figure 43. Verify Prototype Si3018/10 Failure
To
Phone
Line
Host
Controller
Host
UART
Si24xx Si3018 Discretes
RS232
Transceiver
Si24xx Si3018 Discretes
EVB
 Connect the prototype ground to the EVB ground.
 Lift prototype C1 and C2 and EVB C1 and C2 so the Si3018 is disconnected from the Si24xx on both modems.
 Connect EVB C1 and C2 to the Si3018 pad of prototype system C1 and C2.
 Connect the phone line to the RJ11 jack on the prototype system.
 Use PC and HyperTerm and attempt to establish a modem connection.
PC
C2
C1
C2
Prototype System
C1
To
Phone
Line
Host
Controller
Host
UART
Si24xx Si3018 Discretes
RS232
Transceiver
Si24xx Si3018 Discretes
EVB
 Connect the prototype ground to the EVB ground
 Lift prototype and EVB C1 and C2 to decouple the line side from the DSP side. Do same on evaluation board.
 Connect prototype system C1 and C2 to the Si3018 pad of EVB C1 and C2
 Connect the phone line to the RJ11 jack on the EVB
 Run the prototype system software to attempt a modem connection
C2
C1
C2
C1
Prototype System