PTC PT2318

Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
DESCRIPTION
PT2318 is a sound fader controller IC utilizing CMOS Technology specially designed for car radio hi-fi
audio applications. Four selectable stereo inputs, 1 mono input, bass, treble, volume, balance and
fader controls, mute function and a special loudness feature which is automatically controlled in
combination with the volume level setting are all built into a single I2C bus controlled stereo
preamplifier chip having the highest performance and reliability. Pin assignments and application
circuits are optimized for easy PCB layout and cost saving advantages.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
CMOS technology
I2C bus control interface
4 selectable stereo inputs
1 mono input
Volume, Balance and Fader controls
Bass & Treble controls
Noise reduction circuit interface provided
External equalizer interface provided
Mute control at audio signal zero crossing
Internal power-on reset function
Mute function controlled via the I2C bus or pin
Special automatic loudness feature in combination with the volume setting
APPLICATIONS
• Car audio
• Hi-Fi audio applications
PT2318 V1.2
-1-
March, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
MUTE
TRE_L
BAS2_L
BAS1_L
LOUD_L
VOL1_L
SEL_L
BLOCK DIAGRAM
Mute
Function
VREF
Z ero Cross
Detector
VCC
G ND
CAP
Left Channel
Volume 1
Loudness
Left
Channel
Left
Channel
Bass
Control
Treble
Control
IN _L1
Volume 2
Balance
Fader F ront
SL_O UT
Volume 2
Balance
Fader Rear
FL_OU T
IN _L2
IN _L3
IN_L4
MON O
Logic
2
I C Bus
Input
Source
Selector
IN_R1
R ight C hannel
Volume 1
Loudness
IN_R2
Right
Channel
R ight
Channel
Bass
Control
Treble
Control
IN _R3
IN _R4
-2-
SDA
FR _OUT
SR_O UT
TRE_R
BAS2_R
BAS1_R
LOUD_R
VOL1_R
Volume 2
Balance
Fader Rear
SEL_R
PT2318 V1.2
Volume 2
Balance
Fader F ront
SCL
March, 2006
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
PIN CONFIGURATION
PT2318 V1.2
SDA
1
32
SCL
GND
2
31
SL_OUT
3
30
VCC
SR_OUT
FL_OUT
TRE_L
4
29
FR_OUT
5
28
TRE_R
BAS2_L
6
27
BAS2_R
BAS1_L
7
26
VOL1_L
LOUD_L
8
25
BAS1_R
VOL1_R
24
LOUD_R
9
P T 23 1 8
SEL_I
10
23
SEL_R
IN_L4
11
22
IN_R4
MUTE
12
21
VREF
IN_L3
13
20
IN_R3
MONO
IN_L2
14
19
CAP
15
18
IN_R2
IN_L1
16
17
IN_R1
-3-
March, 2006
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
PIN DESCRIPTION
Pin Name
SDA
GND
SL_OUT
FL_OUT
I/O
I
O
O
TRE_L
I/O
BAS2_L
I/O
BAS1_L
VOL1_L
LOUD_L
SEL_L
IN_L4
MUTE
IN_L3
MONO
IN_L2
IN_L1
IN_R1
IN_R2
CAP
IN_R3
VREF
IN_R4
SEL_R
LOUD_R
VOL1_R
BAS1_R
I
I
I
O
I
I
I
I
I
I
I
I
I
I
O
I
I
I
BAS2_R
I/O
TRE_R
I/O
FR_OUT
SR_OUT
VCC
SCL
O
O
I
PT2318 V1.2
Description
Serial Data Input Pin
Ground
Left Rear Channel Output Pin
Left Front Channel Output Pin
Left Channel Treble Control Pin
or may be used as External Equalizer Input Pin
Left Channel Bass Control Pin
or may be used as External Equalizer Output Pin
Left Channel Bass Control Pin
Left Control Section Volume Input Pin
Left Control Section Loudness Input Pin
Left Channel Output Source Selector
Left Channel Source 4 Input Pin
Mute Function Control Pin
Left Channel Source 3 Input Pin
Input “MONO” Source
Left Channel Source 2 Input Pin
Left Channel Source 1 Input Pin
Right Channel Source 1 Input Pin
Right Channel Source 2 Input Pin
Supply Electronic Filtering
Right Channel Source 3 Input Pin
Reference Voltage (0.5Vcc)
Right Channel Source 4 Input Pin
Right Channel Output Source Selector
Right Control Section Loudness Input Pin
Right Control Section Volume 1 Input Pin
Right Channel Bass Control Pin
Right Channel Bass Control Pin
Or may be used as External Equalizer Output Pin
Right Channel Treble Control Pin
Or may be used as External Equalizer Input Pin
Right Front Output Pin
Right Rear Output Pin
Supply Voltage
Serial Clock Input Pin
-4-
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
March, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
FUNCTION DESCRIPTION
BUS INTERFACE
Data are transmitted to and from the microprocessor to the PT2318 via the SDA and SCL. The SDA
and SCL make up the BUS Interface. It should be noted that the pull-up resistors must be connected to
the positive supply voltage.
DATA VALIDITY
A data on the SDA Line is considered valid and stable only when the SCL Signal is in HIGH State. The
HIGH and LOW States of the SDA Line can only change when the SCL signal is LOW. Please refer to
the figure below.
SDA
SCL
D a t a Lin e
S ta b le ,
D a t a Va lid
D a ta
C h a ng e
A llo w e d
START AND STOP CONDITIONS
A Start Condition is activated when
1. the SCL is set to HIGH and
2. SDA shifts from HIGH to LOW State.
The Stop Condition is activated when
1. SCL is set to HIGH and
2. SDA shifts from LOW to HIGH State.
Please refer to the timing diagram below.
SC L
SD A
Sto p
S t a rt
PT2318 V1.2
-5-
March, 2006
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Sound Fader Controller IC
PT2318
BYTE FORMAT
Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an
Acknowledge Bit. The MSB is transmitted first.
ACKNOWLEDGE
During the Acknowledge Clock Pulse, the master (µP) puts a resistive HIGH level on the SDA Line.
The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during the
Acknowledge Clock Pulse so that the SDA Line is in a Stable Low State during this Clock Pulse.
Please refer to the diagram below.
CLK
1
DATA
2
3
4
7
8
9
MSB
A cknowledgment
from R eceiver
Start
The audio processor that has been addressed has to generate an Acknowledge after receiving each
byte, otherwise, the SDA Line will remain at the High Level during the ninth (9th) Clock Pulse. In this
case, the master transmitter can generate the STOP Information in order to abort the transfer.
TRANSMISSION WITHOUT ACKNOWLEDGE
If you want to avoid the acknowledge detection of the audio processor, a simpler µP transmission may
be used. Wait one clock and do not check the slave acknowledge of this same clock then send the new
data. If you use this approach, there are greater chances of faulty operation as well as decrease in
noise immunity.
PT2318 V1.2
-6-
March, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
INTERFACE PROTOCOL
The interface protocol consists of the following:
1. START Condition
2. Chip Address Byte=80H
3. ACK=Acknowledge Bit
4. Data Byte
5. STOP Condition
Please refer to the diagram below:
MSB
START
First Byte
LSB
1 0 0 0 1 0 0 0
Subaddress
ACK
Data Byte
ACK
STOP
Chip Address
Notes:
1. ACK=ACKNOWLEDGE
2. Max. Clock Speed=100K Bits/S
The SUBADDRESS is the Second Byte transmitted following the CHIP ADDRESS Byte. Please refer
to the table below.
MSB
7
0
0
0
0
0
0
0
0
6
0
0
0
0
0
0
0
0
5
0
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
2*
0
0
0
0
1
1
1
1
LSB
1* 0*
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
Function
Volume/Loudness
Fader: Front, Right
Fader: Front, Left
Fader: Rear, Right
Fader: Rear, Left
Bass
Treble
Selector Switch
Note: These are Significant SUBADDRESS bits.
The last bits of SUBADDRESS are named “specific bit”. When more than one data bit send to PT2318,
the SUBADDRESS will increase automatically depend on specific bit. It is unnecessary to send to
SUBADDRESS, data bit will fill in SUBADDRESS bit. Please refer to following table.
START
Start
Data
Data
Data
Data
Sub
Chip
ACK
ACK
ACK
ACK
ACK
Byte
Byte
Byte
Byte
Address
Address
80H
00H
Corresp
Corresp
Corresp
Correspo
onding
onding
onding
nding
Sub
Sub
Sub
Sub
Address
Address
Address
Address
00H
01H
02H
03H
PT2318 V1.2
-7-
ACK STOP
End
March, 2006
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Sound Fader Controller IC
PT2318
The Third Byte following the CIP ADDRESS & SUBADDRESS is defined in the table below.
MSB
LSB
Function
7
6
5
4
3
2
1
0
ZCM LOFF
V5
V4
V3
V2
V1
V0
Volume/Loudness
X
X
FFR5
FFR4
FFR3
FFR2
FFR1
FFR0
Fader: Front, Right
X
X
FFL5
FFL4
FFL3
FFL2
FFL1
FFL0
Fader: Front, Left
X
X
FSR5
FSR4
FSR3
FSR2
FSR1
FSR0
Fader: Rear, Right
X
X
FSL5
FSL4
FSL3
FSL2
FSL1
FSL0
Fader: Rear, Left
X
X
X
BAS4
BAS3
BAS2
BAS1
BAS0
Bass
X
X
X
TRE4
TRE3
TRE2
TRE1
TRE0
Treble
GMU
X
X
X
X
SC2
SC1
SC0
Selector Switch
X=Irrelevant (It should be noted that during testing, this bit is given the value of “1”)
I2C BUS START-UP TIMING
After Power is turned ON, PT2318 needs to wait for a short time in order to insure stability. This waiting
period is relative to the value of Cref. When Cref=10 µF, the waiting time period for PT2318 to send I2C
Bus Signal is at least 300ms. If the waiting time period is less than 300ms, I2C Control may fail. Please
refer to the figure below.
V
POWER ON
90% VDD
VDD
at least 300ms
SDA/SCL
PT2318 V1.2
-8-
March, 2006
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Sound Fader Controller IC
PT2318
SOURCE SELECTOR
PT2318 provides 4 selectable stereo inputs and one mono input. The source selector is used to select
any one of the mentioned source input options. Please refer to the table below.
Input Source
Stereo Inputs: IN_L1 & IN_R1
Stereo Inputs: IN_L2 & IN_R2
Stereo Inputs: IN_L3 & IN_R3
Stereo Inputs: IN_L4 & IN_R4
Mono Input: MONO
Source Selector Bits
SC2
SC1
SC0
1
1
1
1
1
0
1
0
1
1
0
0
0
X
X
Notes:
1. SC0 to SC2=Source Selector Control Bits
2. X=Irrelevant
PT2318 V1.2
-9-
March, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
VOLUME CONTROL
The Volume Control Function consists of two blocks; namely, Volume 1 Control Block and Volume 2
Control Block.
VOLUME 1 CONTROL BLOCK
The Volume 1 Control Block has an attenuation range of +20dB to -31dB at 1dB/step. The left and right
channels have the same gain/attenuation setting. This block operates in conjunction with the Loudness
Control. When the Volume 1 Control maximum gain (=20dB) is selected, the filter characteristic is
linear. The filter characteristic increases automatically over a range of 32dB down to
a setting of -12dB. This means that the Volume 1 Control Block maximum filter characteristics is
obtained at a -12dB setting. If the volume is further reduced, the filter characteristics are not in any way
affected. The maximum selected filter characteristics is determined by the external components.
Please refer to the diagram below.
Volume control and Loudness (Low Roll-Off Frequency included)
VOLUME 2 CONTROL BLOCK
The Volume 2 Control Block operates in combination with the Balance and Fader Functions. Each
output has one independent attenuator which has a control range of 0dB to -55dB at 1dB/step with
an additional mute step.
PT2318 V1.2
- 10 -
March, 2006
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
BASS FUNCTION
The bass function has a control range of -15dB to +15dB at 40Hz. The basic step width of the bass
control is 3dB. The intermediate steps are obtained by switching 1.5dB boost and 1.5 dB attenuation
steps. The bass control function can be disabled via the I2C Bus. If the bass control function is disabled,
the internal signal flow is discontinued, and the pins -- BAS2_L and BAS2-R are used as inputs for
connecting an external equalizer. The Bass Function Frequency Response curve is shown below:
TREBLE FUNCTION
The Treble Function has a control range of -12dB to +12dB at 1.5dB / step at 15KHz. The basic step
width of the treble control is 3dB and the intermediate steps are obtained by switching 1.5dB boost and
1.5 dB attenuation steps. The treble control function can be disabled via the I2C Bus. If the treble
control function is disabled, the internal signal flow is discontinued, and the treble pins -- TRE_L and
TRE_R -- are used as inputs for connecting an external equalizer. The Treble Function Frequency
Response Curve is given below.
PT2318 V1.2
- 11 -
March, 2006
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Sound Fader Controller IC
PT2318
VOLUME SETTING
The volume setting table is given below. The loudness characteristic increases in a linear manner for
every step in the volume whose range is from +20dB to -11dB.
GV (dB)
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
PT2318 V1.2
V5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
V4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
- 12 -
V2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
V1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
V0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
March, 2006
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Sound Fader Controller IC
PT2318
The loudness characteristic is constant during the volume range from -12dB to -31 dB.
GV (dB)
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
-26
-27
-28
-29
-30
-31
V5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
V3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
V2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
V1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
V0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
V2
0
0
0
0
1
1
1
1
0
0
0
0
V1
1
1
0
0
1
1
0
0
1
1
0
0
V0
1
0
1
0
1
0
1
0
1
0
1
0
The steps are repeated for range -28dB to -31dB.
GV(dB)
-28
-29
-30
-31
-28
-29
-30
-31
-28
-29
-30
-31
PT2318 V1.2
V5
0
0
0
0
0
0
0
0
0
0
0
0
V4
0
0
0
0
0
0
0
0
0
0
0
0
V3
1
1
1
1
0
0
0
0
0
0
0
0
- 13 -
March, 2006
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
The Volume 2 (Balance & Fader) Setting is shown below.
GV (dB)
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
-26
-27
-28
-29
-30
-31
-32
-33
-34
-35
PT2318 V1.2
FSR5
FSR5
FFL5
FFR5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
FSR4
FSR4
FFL4
FFR4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
FSR3
FSR3
FFL3
FFR3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
- 14 -
FSR2
FSR2
FFL2
FFR2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
FSR1
FSR1
FFL1
FFR1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
FSR0
FSR0
FFL0
FFR0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
March, 2006
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
Sound Fader Controller IC
GV (dB)
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
-46
-47
-48
-49
-50
-51
-52
-53
-54
-55
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
FSR5
FSR5
FFL5
FFR5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
FSR4
FSR4
FFL4
FFR4
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
PT2318
FSR3
FSR3
FFL3
FFR3
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
FSR2
FSR2
FFL2
FFR2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
FSR1
FSR1
FFL1
FFR1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
FSR0
FSR0
FFL0
FFR0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Note: Only the subaddress changes, the data remains the same for a particular range.
PT2318 V1.2
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March, 2006
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Sound Fader Controller IC
PT2318
Bass setting is shown below.
GBASS (dB)
+15.0
+13.5
+15.0
+13.5
+15.0
+13.5
+12.0
+10.5
+9.0
+7.5
+6.0
+4.5
+3.0
+1.5
0 (see note 1)
0 (see note 2)
-1.5
-3.0
-4.5
-6.0
-7.5
-9.0
-10.5
-12.0
-13.5
-15.0
-13.5
-15.0
(see note 3)
(see note 3)
(see note 3)
(see note 3 & 4)
BAS4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BAS3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
BAS2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
BAS1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
BAS0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Notes:
1. Recommended Data Word for step 0dB.
2. Result of 1.5dB boost and 1.5dB attenuation.
3. The last four bass control data words mute the bass response.
4. The last bass and treble control data words (00000) enable the external equalizer connection.
PT2318 V1.2
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March, 2006
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Sound Fader Controller IC
PT2318
Treble setting is shown below.
GTREBLE (dB)
+12.0
+10.5
+12.0
+10.5
+12.0
+10.5
+12.0
+10.5
+9.0
+7.5
+6.0
+4.5
+3.0
+1.5
0 (see note 1)
0 (see note 2)
-1.5
-3.0
-4.5
-6.0
-7.5
-9.0
-10.5
-12.0
(see note 3)
(see note 3)
(see note 3)
(see note 3)
(see note 3)
(see note 3)
(see note 3)
(see note 3 & 4)
TRE4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
TRE3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
TRE2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
TRE1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
TRE0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Notes:
1. Recommended Data Word for step 0dB.
2. Result of 1.5dB boost and 1.5dB attenuation.
3. The last eight treble control data words select the treble output.
4. The last bass and treble control data words (00000) enable the external equalizer connection.
PT2318 V1.2
- 17 -
March, 2006
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Sound Fader Controller IC
PT2318
MUTE
PT2318 provides three mute modes namely:
1. Zero Crossing Mode via the I2C bus using 2 independent zero crossing detectors.
2. Fast Mute via Mute Pin
3. Fast Mute via I2C Bus either by General Mute (GMU) or by Volume 2 Block Setting.
The following table shows the setting for the Zero Crossing Mode and the General Mute Mode
GMU
0
0
1
1
ZCM
0
1
0
1
Function
Direct MUTE off
MUTE off delayed until the next Zero Crossing
Direct MUTE
MUTE delayed until the next Zero Crossing
Notes:
1. GMU=General Mute Bit (Mute control for all outputs)
2. ZCM=Zero Crossing Mode Bit
The mute function is immediately performed if the ZCM=“0”. If ZCM=”1”, the mute is activated after
changing the GMU bit. The actual mute switching is delayed until the next zero crossing of the audio
frequency signal. The left and right audio channels are independent of each other, therefore, there are
two built-in comparators controlling the independent mute switches. In order to avoid too much delay in
mute switching when very low frequencies are processed, the maximum delay time is limited to a
typical value of 100ms by an integrated timing circuit and an external capacitor. This timing circuit is
triggered by the reception of a new data word for the switch function (including a GMU bit). After an
external capacitor is discharged and charged, the muting switch follows the GMU bit if there was no
zero crossing detected during that particular time.
Externally controlling the mute function is possible. If the mute pin is set to Ground, all outputs are
muted immediately (this is the hardware mute.). Please refer to the diagram below.
PT2318
12 MUTE
HARDWARE
MUTE SWITCH
The mute request overwrites all mute controls via the I2C bus for the time the pin is held at “LOW” level.
The hardware mute function is ideal for Radio Data System applications. The zero crossing mute
avoids modulation plops. This feature is advantageous when the changing presets and/or sources.
PT2318 V1.2
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March, 2006
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Sound Fader Controller IC
PT2318
INPUT SIGNAL SELECTION VIA ZERO CROSS MUTE MODE
A selection from the Input A (IN_L1) to Input B (IN_L2) Left Channels produces a modulation click at
the time of the switching. This will depend on the difference between the signal values. Please refer to
the diagram below for the zero cross function (L Channel Only)
V
4
( 1)
3
2
1
( 2)
0
t1
t2
t
-1
( 3)
-2
-3
-4
Notes:
1. (1)=Output
2. (2)=Input 2 (IN_L2)
3. (3)=Input 1 (IN_L1)
At t1, the maximum different between signals is 7Vp-p. At this point, a loud click can be heard. Using
the zero cross detector, no modulation click is audible.
LOUDNESS FUNCTION
The Loudness Function is used in combination with Volume 1 Control Block and may be enabled or
disabled via the I2C Bus Control. Please refer to the table below for Loudness Function setting.
Loudness Function
Loudness On
Loudness Off
LOFF
0
1
Note: LOFF=Loudness Function Control Bit
PT2318 V1.2
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March, 2006
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Sound Fader Controller IC
PT2318
ABSOLUTE MAXIMUM RATING
Parameter
Supply voltage
Operating temperature
Storage temperature
Voltage at each pin
(when Pin 2 as GND)
Symbol
Vcc
Topr
Tstg
Conditions
Vpin
Min.
0
-40
-65
Max.
10
+85
+150
Unit
V
℃
℃
0
Vcc
V
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=8.5V, Rs=600Ω, RL=10kΩ, CL=2.5nF, AC Coupled, f=1KHz,
Ta=25℃, Gain Control: Gv=0dB, Bass=Linear, Treble=Linear, Fader=Off, Balance in Mid Position
Loudness Off)
Parameter
Supply voltage
Supply current
Internal DC
voltage
(Input & Output)
Max. voltage
gain
Input sensitivity
Roll-off
frequency
Channel
separation
Symbol
Vcc
Ic
Conditions
-
Min.
7.5
-
Typ.
8.5
26
Max.
9.5
32
Unit
V
mA
VDC
-
3.75
4.0
4.25
V
19
20
21
dB
-
200
-
mV
60
-
-
Hz
30
-
-
Hz
20000
-
-
Hz
17
-
-
Hz
Vi=2V, 250Hz to 10KHz
90
96
-
dB
20Hz to 12.5KHz, Vi=100mV, Gv=20dB
20Hz to 12.5KHz, Vi=1V, Gv=0dB
20Hz to 12.5KHz, Vi=2V, Gv=0dB
20Hz to 12.5KHz, Vi=2V, Gv=-10dB
Vr(rms)<200mV, f=100Hz
Vo=2.0V, Gv=0dB
Vo=2.0V, Gv=12dB
Vo=2.0V, Gv=12dB
Between bus input & signal outputs
-
22
0.07
0.05
0.2
0.03
62
99
91
83
110
30
40
%
%
%
%
dB
dB
dB
dB
dB
KΩ
GVmax Rs=0Ω, RL=∞
Vi (rms) VO-2000mV, Gv=20dB
CKIN=220nF, CKVL=220nF, Zi=Zi(min)
Low frequency (-1dB)
CKIN=220nF, CKVL=220nF, Zi=Zi(min)
Low frequency (-3dB)
fro
CKIN=220nF, CKVL=220nF, Zi=Zi(min)
High frequency (-1dB)
CKIN=470nF, CKVL=220nF, Zi=Zi(typ)
Low frequency (-3dB)
αcs
Total harmonic
distortion
THD
Ripple rejection
RR
Signal to noise
ratio
S/N
Crosstalk
Input impedance
αct
Zi
PT2318 V1.2
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Sound Fader Controller IC
Parameter
Input isolation
(One selected
source to any
other input)
Symbol
PT2318
Conditions
Min.
Typ.
Max.
Unit
f=1KHz
-
104
-
dB
f=12.5KHz
-
95
-
dB
2.7
2.3
130
220
V
V
Ω
-
-
KΩ
0
-
dB
150
30
130
200
40
220
KΩ
KΩ
Ω
-
-
KΩ
2.4
120
25
13
13
220
50
22
-
V
µV
µV
µV
µV
106
-
dB
86
-
dB
1
100
1.0
2
3
2
-
dB
dB
dB
dB
dB
dB
51
-
dB
1
15
4
+20
-
dB
dB
dB
dB
αs
Max. input voltage
THD<0.5%, Vcc=8.5V
Vi (rms)
(RMS value)
THD<0.5%, Vcc=7.5V
Output impedance
Zo
Output load
RL
10
resistance
Voltage gain
Gv
(Source selector)
Control Section (Source Selector not connected, Source Resistance=600Ω)
Volume input
70
Input impedance
Zi
Loudness input
20
Output impedance
Zo
Output load
RL
2
resistance
Max. input voltage
Vi(rms) THD<0.5%
Gv=20dB
Noise output
Gv=0dB
Vno
voltage
Gv=-66dB
MUTE position
Total continuous
control range
CRtot
Recommended
control range
Step range
Step resolution
Gstep
Step error between any adjoining step
Gv=+20 to -50dB
ΔGa
Attenuation set error
Gv=-51 to -66dB
ΔGt
Gain tracking error
Gv=+20 to -50dB
Mute attenuation
MUTEatt
95
Volume 1 Control + Loudness
Continuous volume
CRvol
control range
Voltage gain
Gv
-31
Step resolution
Gstep
f=40Hz
Max. loudness
LBmax
f=10KHz
-
PT2318 V1.2
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Sound Fader Controller IC
Parameter
Symbol
Bass Control
Max. boost
Gbass
(Bass control)
Max. attenuation
Step resolution
Gstep
(Toggle switching)
Step error between any
Gstep
adjoining step
Treble Control
Max. boost
Gtreble
Max. attenuation
Gtreble
Max. boost 2
Gtreble
Step resolution
Gstep
(Toggle switching)
Step error between any
Gstep
adjoining step
Volume 2 + Balance + Fader Controls
Continuous attenuation
CR
(Fader & volume control)
Step resolution
Gstep
Attenuation set error
Gstep
Hardware Mute
Mute: Active
Input level
VSWLOW
Zero Crossing Mute
Discharger current
Id
Charge current
Ich
Delay switch level
VSWDEL
Delay time
td
Window for audio signal
Vwind
zero crossing detection
Muting at Power Supply Drop
Supply drop for MUTE
Vccdrop
active
I2C Bus Control
High level input voltage
VIH
Low level input voltage
VIL
PT2318 V1.2
PT2318
Conditions
Min.
Typ.
Max.
Unit
f=40Hz
+14
+15
+16
dB
f=40Hz
-14
-15
-16
dB
f=40Hz
-
1.5
-
dB
f=40Hz
-
-
1
dB
f=15KHz
f=15KHz
f>15KHz
+11
-11
-
+12
-12
-
+13
-13
15
dB
dB
dB
f=15KHz
-
1.5
-
dB
f=15KHz
-
-
1
dB
-
55
-
dB
-
1
-
2
2
dB
dB
-
0.8
-
V
-300
-
0.6
-150
1.5
100
-
µA
µA
V
ms
-
50
-
mV
6.9
7
-
V
3.4
-0.3
-
9.5
+1.5
V
V
Cm=10nF
- 22 -
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Sound Fader Controller IC
PT2318
APPLICATION CIRCUIT
2
I C Bus
To Output
5.6nF
33nF
CKVL 220nF
2.2KΩ
20KΩ 8.2nF 150nF
Input Source 4 (Left Channel)
Mute
10nF
Input Source 3 (Left Channel)
1
SDA
SCL 32
2
GND
VCC 31
3
SL_OUT
SR_OUT 30
4
FL_OUT
FR_OUT 29
5
TRE_L
TRE_R 28
6
BAS2_L
BAS2_R 27
7
BAS1_L
BAS1_R 26
8
VOL1_L
9
LOUD_L
10
SEL_l
SEL_R 23
11
IN_L4
IN_R4 22
12 MUTE
VREF 21
IN_L3
IN_R3 20
13
Mono Source Input
Input Source 2 (Left Channel)
Input Source 1 (Left Channel)
PT2318
VOL1_R 25
MCU
To Output
5.6nF
33nF
CKVL 220nF
2.2KΩ
LOUD_R 24
CAP 19
MONO
150nF
8.2nF 20KΩ
+
100 µ F
+
47 µ F
Input Source 4 (Right Channel)
Input Source 3(Right Channel)
15
IN_L2
IN_R2 18
Input Source 2 (Right Channel)
16
IN_L1
IN_R1 17
Input Source 1 (Right Channel)
C KIN
PT2318 V1.2
- 23 -
March, 2006
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Sound Fader Controller IC
PT2318
ORDER INFORMATION
Valid Part Number
PT2318-S
PT2318
PT2318 V1.2
Package Type
32 Pins, SOP, 300mil
32 Pins, DIP, 600mil
- 24 -
Top Code
PT2318-S
PT2318
March, 2006
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
Sound Fader Controller IC
PT2318
PACKAGE INFORMATION
32 PINS, SOP, 300MIL
PT2318 V1.2
- 25 -
March, 2006
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Sound Fader Controller IC
Symbols
A
A1
A2
b
b1
b2
c
c1
D
E
e
H
L
α
PT2318
Min.
0.004
0.082
0.014
0.014
0.026
0.007
0.007
0.812
0.292
0.405
0.021
0°
Nom.
0.088
0.016
0.016
0.028
0.008
0.008
0.818
0.296
0.050 BSC.
0.412
0.031
4°
Max.
0.104
0.30
0.094
0.020
0.018
0.032
0.0125
0.010
0.824
0.299
0.419
0.041
8°
Notes:
1. Dimensioning and tolerancing per ANSI Y14.5-1982.
2. Dimension D does not include mold flash, protrusions or gate burrs. Mold Flash, protrusion or gate
burrs shall not exceed 0.15mm (0.006 in) per side.
3. Dimension E does not include interlead flash or protrusions. Interlead flash or protrusions shall not
exceed 0.25 mm (0.010 in) per side.
4. The chamfer on the body is optional. It is not present, a visual index feature must be located within
the crosshatched area.
5. L is the length of the terminal for soldering to a substrate.
6. The lead width B as measured 0.36 mm (0.014 in) or greater above the seating plane, shall not
exceed a maximum value of 0.61 mm (0.24 in)
7. Controlling dimension: MILLIMETER.
8. N=Number of terminal position (N=32)
9. Refer to JEDEC MO-119 variation AC.
JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2318 V1.2
- 26 -
March, 2006
Tel: 886-2-66296288
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Sound Fader Controller IC
PT2318
32 PINS, DIP, 600MIL
PT2318 V1.2
- 27 -
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Sound Fader Controller IC
Symbol
A
A1
B
B1
C
D
E
E1
e1
eA
L
α
Q
S
PT2318
Min.
0.170
0.015
0.016
0.045
0.009
1.600
0.600
0.530
0.120
0°
0.065
0.065
Nom.
0.100 BSC.
0.600 BSC.
-
Max.
0.200
0.050
0.022
0.067
0.015
1.670
0.625
0.560
0.150
15°
0.080
0.087
Notes:
1. Refer to applicable symbol list.
2. Dimension and tolerancing per ANSI Y14.5-1982
3. αapplies to spread leads prior to installation.
4. N=Number of terminal position (N=32)
5. D & E1 does not include mold flash. Allowable flash is 0.010 per side.
6. Outlines on which the seating plane is coincident with the base plane (A1=0) terminal lead standoffs
are not required, and B1 may equal B along any part of the lead above the seating/base plane.
7. Pin 1 identifier must be located in this area.
8. Controlling dimension: INCH.
9. Refer to JEDEC MO-015 variation AP.
JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2318 V1.2
- 28 -
March, 2006