Specifications

Si2457/34/15/04
Rev. 1.3 11
2. Typical Application Schematic
RTS_ DCD_
ESC INT_
TXD
RESET_
RXD CTS_ GPIO
VDD
RING TIP
Refer to AN93 Appendix A for layout guidelines. Please submit layout to Silicon Labs for review prior to PCB fabrication.
R5
R9
R7
C51
-+
D1
C40
R4
C50
R10
+
C4
Z1
C10
C6
C9
Q4
C5
FB1
R3
R16
C1
R2
R6
R8
Y1
12
C3
R15
FB2
C41
R1
Q3
U2
QE
1
DCT
2
RX
3
IB
4
C1B
5
C2B
6
VREG
7
RNG1
8
DCT2
16
IGND
15
DCT3
14
QB
13
QE2
12
SC
11
VREG2
10
RNG2
9
U1
CLKIN/XTALI
1
XTALO
2
GPIO
3
VD
4
RXD
5
TXD
6
CTS
7
RESET
8
C2A
9
C1A
10
INT
11
GND
12
VA
13
ESC
14
DCD
15
RTS
16
C7
R12
Q5
Q2
C8
R11
RV1
C2R13
Q1
Emissions option
External crystal option
Figure 6. Typical Si2457/34/15/04 Schematic with 16-pin System-Side Option