6-Channel Electronic Volume Controller IC PT2258 DESCRIPTION
PT2258 is a 6-Channel Electronic Volume Controller IC utilizing CMOS Technology specially designed for the new generation of AV Multi-Channel Audio System. PT2258 provides an I2C Control Interface, an attenuation range of 0 to -79dB at 1dB/step, low noise, and high channel separation. Housed in 20 pins, DIP or SOP, PT2258’s pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages.
FEATURES
• CMOS Technology
•Low Power Consumption
•Least External Components
•Attenuation Range: 0 to -79dB at 1dB/step
•Operating Voltage: 5 to 9 V
•Low Noise, S/N Ratio>100dB (A-weighting)
•High Channel Separation
•I2C Bus Control Interface
• Selectable Address
• 6-Channel Outputs
•Available in 20 pins, DIP or SOP
APPLICATIONS
•AV Surround Audio Equipment
•Car Audio
• Mini Compo
•Computer Multi-Media Speaker
•Other Audio Equipments
6-Channel Electronic Volume Controller IC PT2258 BLOCK DIAGRAM
IN1
IN2
IN3
IN4
IN5
IN6 COD E1 COD E2
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
Vc c
REF SDA
DGN D SCL GND
6-Channel Electronic Volume Controller IC  PT2258
PIN CONFIGURATION
IN 1IN 2IN 3O U T 1O U T 4O U T 2O U T 5O U T 3O U T 6
SC L R EF SD A C O D E 2C O D E 1G N D D G N D VC C
IN 4IN 5IN 6
6-Channel Electronic Volume Controller IC  PT2258
PIN DESCRIPTION
Pin Name
I/O
Description
Pin No. IN1 I
Channel Input No. 1.
Connect a Capacitor to Audio Source    1 IN2 I
Channel Input No. 2
Connect a Capacitor to Audio Source    2 IN3 I
Channel Input No. 3
Connect a Capacitor to Audio Source
3
CODE2 - Refer to Address Code Section    4
DGND - Digital Ground    5 SCL I I 2C Clock Input    6 SDA I I 2C Data Input
7 IN4 I
Channel Input No. 4electronic去掉ic是什么
Connect a Capacitor to Audio Source 8 IN5 I
Channel Input No. 5
Connect a Capacitor to Audio Source 9 IN6 I
Channel Input No. 6
Connect a Capacitor to Audio Source 10 OUT6 O
Channel Output No. 6
Connect a Capacitor to the Next Stage 11 OUT5 O
Channel Output No. 5
Connect a Capacitor to the Next Stage 12 OUT4 O
Channel Output No. 4
Connect a Capacitor to the Next Stage
13
GND - Ground 14
14 REF -
Reference Voltage= 1/2 Vcc
Connect a Capacitor to the Ground
15 VCC - Power Supply Input 16 16 CODE1 - Refer to the Address Code Section
17 OUT3 O
Channel Output No. 3
Connect a Capacitor to the Next Stage 18 OUT2 O
Channel Output No. 2
Connect a Capacitor to the Next Stage 19 OUT1 O
Channel Output No. 1
Connect a Capacitor to the Next Stage
20
6-Channel Electronic Volume Controller IC PT2258
FUNCTION DESCRIPTION
BUS INTERFACE
Data are transmitted to and from the microprocessor to the PT2258 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.
D ATA
C L K
D a ta Lin e S ta b le, D a ta Va lid
D a ta C h a ng e Allo 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.
DATA
CLK
Start Stop
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.

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