Specifications

AN93
Rev. 0.8 163
Figure 33. Verify Prototype Si3018/10 Failure
Figure 34. Si3018/10 Typical Voltages
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
On-Hook
0 V
~1.0 V
~2.3 V
0.7
0.8 V
0 V
0 V
0 V
QE
RNG1
VREG
C2B
C1B
IB
RX
DCT
0 V
~1.0 V
0 V
0 V
0 V
0 V
0 V
DCT2
RNG2
VREG2
S2
QE2
QB
DCT3
IGND
Off-Hook
1.6 V
1.0 V
2.3 V
0.8 V
0.8 V
0 V
2.5 V
3.4 V
QE
RNG1
VREG
C2B
CIB
FB
RX
DCT
2.2 V
0.9 V
1.8 V
0 V
2.1 V
2.8 V
1.6 V
0 V
DCT2
RNG2
VREG2
SC
QE2
QB
DCT3
IGND
Voltages measured with respect to IGND (Si3018 pin 15)