PT2258-SL 查看數據表（PDF） - Princeton Technology

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PT2258-SL

6-Channel Electronic Volume Controller IC

Princeton Technology 

6-Channel Electronic Volume Controller IC

Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT2258

PT2258 CONTROL SOFTWARE PROCEDURE

1. In order to ensure exact operation under any operating voltage, it is recommended an instruction to

clear the register “C0H” must be transmitted first. Please refer to the following diagram:

Start 1 0 0 0 1 0 0 0 Ack 1 1 0 0 0 0 0 0 Ack Stop

2258 Address

Clear Register

2. The PT2258 function register does not have any default settings. After clearing the register, an initial

value must send in order to each register. If a register does has not been set, it is possible that no

sound will be output.

3. When adjusting the volume of PT2258, it is necessary to send a multiple of 10dB followed by a 1dB

code to the attenuator in sequence. If this sequence is not followed, or if only a 10dB or 1dB value is

sent, the IC may not operate normally. Please refer to the diagram below:

Volume setting -42dB：

Start 1 0 0 0 1 0 0 0 Ack 1 1 0 1 0 1 0 0 ACK 1 1 1 0 0 0 1 0 Ack

PT2258 Address

-40dB

-2dB

Start 1 0 0 0 1 0 0 0 Ack 1 1 1 0 0 0 1 0 Ack 1 1 0 1 0 1 0 0 ACK

PT2258 Address

-2dB

-40dB

The two methods above are both acceptable.

Stop

Stop

Warning!! The following transmission method is not permitted.

Send only a 10dB attenuation value:

Start 1 0 0 0 1 0 0 0 Ack 1 1 0 1 0 1 0 0 ACK Stop

PT2258 Address

-40dB

Send only a 10dB attenuation value:

Start 1 0 0 0 1 0 0 0 Ack 1 1 1 0 0 0 1 0 ACK Stop

PT2258 Address

-2dB

Do not send a 10dB code without simultaneously with a 1dB code or in combination with other

instruction codes.

Start 1 0 0 0 1 0 0 0 Ack 1 1 1 0 0 0 1 0 Ack 1 1 1 1 1 0 0 1 ACK 1 1 0 1 0 1 0 0 ACK Stop

PT2258 Address -2dB

All CH mute

-40dB

PT2258 V1.2

-9-

July, 2005

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