CM1481 Datasheet, PDF (6/24 Pages) ON Semiconductor – 2-Channel EMI Filter with ESD Protection for Headsets/Speakers

CM1481 Circuit Diagram
GND
GND
C1
GND
C2
R1
X1
R2
43 _OSC1
44
VDD
42
OSC2
1
13
2
RESETN
IRQN
PB0
PB1
14
15
4 _VPP
PB2
PB3
16
17
41 _TCAP
12
11
10
9
PA0
PA1
PA2
U1
PB4
PB5
PB6
PB7
PC7
PC6
PC5
PC4
PC3
19
20
21
24
25
26
27
28
29
8
7
PA3
PA4
PC2
PC1
30
31
6
5
PA5
PA6
PC0
PD0/RDI
32
33
PA7
PD1/TDO
PD2/MISO
34
35
PD3/MODI ₃₆
PD4/SCK
PD5/SSN
37
38
VSS
TCMP
PD7
39
VDD
22
GND
AUDIO SWITCH
AUDIO SWITCH
GND
C4
VDD
C15
1 _XTALN
24
VDD
XTAL ²
10 _AUDSWIN
AUDSWOP ¹¹
13 _RXAUDIN
8
N/C1
N/C2
9
22
N/C3
19 _SUMIN
U2
20
SUMOP
SWSUMOP
21
6
15
LOGIN
14
VBIAS
SIBIAS
TONE1
TONE2
CAL/CUES
16
17
18
4
5
CSN
23
CDATA
SCLK
VSS
12
7
IRQN
RDATA
3
R14
C8
R15
R17
C6
PIN
NORMAL
CONFIGURE
1
CONFIG
CONFIG
2
BUSY
3
Tx CALL
CLOCK
4
QUIET/OPEN
DATA IN
5
PTT IN
6
SIGNAL IN
7
ALERT
8
LED
DATA OUT
9
TONE OUT
10
MUTE CTRL
11
Tx ON
12
GND
GND
13
V IN
V IN
VIN
R29
+
C ₁₀
R27
R28
LINK
C ₁₁
R16
R26
GND
ALERT
C ₁₂
1
CS
8
C ₁₃
VDD
4
DO
3 _DI
6
PE
U3 _{PRE 7}
2 _SK
VSS ⁵
R22 ^VDD
GND
GND
T1
T2
Tx ON
MUTE CTRL
LED
VDD
R20
R21
BUSY
Fig.3 CM1481 Circuit Diagram
VDD
R30
R31
8
VIN
GND
1
U4 ^VOUT _VDD
V IN
GND
Tx ON
MUTE CTRL
TONE OUT
LED
ALERT
SIGNAL IN
PTT IN
QUIET/OPEN
CALL
BUSY
CONFIG
C ₁₄
J1
13
12
11
10
9
8
7
6
5
4
3
2
1