W681360ES Nuvoton Technology Corporation of America, W681360ES Datasheet - Page 3

• Manufacturer Part Number: W681360ES
• Description: KIT EVAL FOR W681360
• Manufacturer: Nuvoton Technology Corporation of America
• Type: CODECr

Specifications of W681360ES

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: W681360
• Lead Free Status / RoHS Status: Lead free by exemption / Not applicable

4
J23 can be used to connect an RJ9 plug from a “standard” telephone handset or headset to the
appropriate pins on the board (Table 4.0). The default resistor and capacitor values on the board are used
for the maximum amplification with no saturation of a 32ohm speaker using a standard microphone.
Unfortunately the only thing “standard” about the RJ9 handset jack is that the microphone and speaker are
always on the same pins. BUT, the microphone polarity can be positive, or negative, depending upon how
the manufacturer designed their telephone set. This means that one has about a 50% chance of wiring it
up wrong the first time UNLESS you know ahead of time which polarity handset you have. Many years
ago, with carbon microphones acting as variable resistors this was not an issue. But with today’s modern
handsets using polarized electret microphones polarity is very important. The circuit in Figure 1 assumes
that the positive side of the microphone is connected to pin 1 of the RJ9 plug and the negative side to pin 4.
Reversing the wires from the RJ9 to the holes in J23 will solve the polarity problem if there is no audio.
Connecting Microphone and Speaker to the W681xxxES
W6810, W681512 or W681310
are Populated with C6 and R11 as shown
below.
Populated
Not Populated
Populated
MIC+
SPK-
SPK+
MIC-
VCC
C6
J23
CON4
Figure 1: EW681xxxES Board Schematics Telephone Handset Default Diagram
1
2
3
4
1
1
J21
CON1
J22
CON1
Not Populated
Not Populated
Not Populated
R11
R1
1.5K
R2
1.5K
C2
0.1uF
C3
0.1uF
Device Number
0.1uF
C6
W6810
W681512
W681310
R3 1K
R4 1K
+
Table 4.0 : J23 Pin assignments
Pin1 Pin2
Mic+ Speaker- Speaker+ Mic -
C4
4.7uF @10v
R9
27K
R8
3K
0 Ohm
R11
VCC
C8
VREF
RO-
PAI
PAO-
PAO+
C7 1200pf
R6
R7 20K
R10
1K
R5 27K
1200pf
1
1
1
1
1
1
27K
J1
CON1
J2
CON1
J3
CON1
J4
CON1
J5
CON1
J6
CON1
C5
0.1uF
Pin3
AO
VAG
VREF
RO-
PAI
PAO-
PAO+
17
18
19
20
1
2
3
4
5
FSR
PCMR
BCLKR
PUI
MCLK
BCLKT
U1
AO
AI-
AI+
VAG
VREF
RO-
PAI
PAO-
PAO+
3
1
1
1
1
1
1
VCC
J7
CON1
J8
CON1
J9
CON1
J10
CON1
J11
CON1
J12
CON1
Pin4
W68XXXX
BCLKR
BCLKT
PCMR
PCMT
MCLK
FSR
FST
PUI
u/A
C1
0.1uF
14
12
13
11
8
9
7
16
10
PCMT
FST
FST
BCLKT
PCMT
MCLK
PCMR
BCLKR
FSR
U/A
PUI
1
1
1
J13
CON1
J14
CON1
J15
CON1
VCC
R12
2K
(FRAME SYNC TRANSMIT)
(BIT CLOCK TRANSMIT)
(PCM OUTPUT)
(2.048 MHz MASTER CLOCK IN)
(PCM INPUT)
(BIT CLOCK RECEIVE)
(FRAME SYNC RECEIVE)
(PCM MODE CONTROL)
(POWER CONTROL)
U/A
AI-
AO
1
1
1
J16
CON1
J17
CON1
J18
CON1
AI+
VAG
1
1
J19
CON1
J20
CON1