Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual Test the Prototype Si3018/10 Circuitry

AN93

Prototype System

			C1
Host	Host	Si24xx	Si3018	Discretes
Controller	UART				To
			C2		Phone
					Line
			C1
PC	RS232	Si24xx	Si3018	Discretes
	Transceiver
	EVB		C2

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.

Figure 42. Test the Prototype Si3018/10 Circuitry

Prototype System

		C1
Host	Host	Si24xx	Si3018	Discretes
Controller	UART
		C2
		C1
	RS232	Si24xx	Si3018	Discretes
	Transceiver
				To
	EVB	C2		Phone
				Line

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

Figure 43. Verify Prototype Si3018/10 Failure

246 Rev. 1.3