PT2259L データシートの表示（PDF） - Princeton Technology

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PT2259L

Volume Controller IC

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Volume Controller IC

PT2259

PT2259 CONTROL SOFTWARE PROCEDURE

PT2259 has a built-in Power-On Reset function which clears the function register to zero after

power-on. In order to ensure normal operation under any operating voltage, it is recommended an

instruction to clear the register must be transmitted. Please refer to the following diagram:

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

2259 Address Clear Registry

The PT2259 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.

When adjusting the volume of PT2259, 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:

Example : Request volume setting of –42dB:

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

2259 Address -40dB

-2dB

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

2259Address

-2dB

-40dB

The two methods above are both acceptable.

WARNING! THE FOLLOWING TRANSMISSION METHODS ARE NOT PERMITTED.

Sending only a 10dB attenuation value:

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

2259 Address -40dB

Sending only a 1dB attenuation value:

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

2259 Address -2dB

Sending a 10dB code with a 1dB code simultaneously or in combination with other control codes:

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

2259 Address -2dB

Right Channel -2dB -40dB

PT2259 V1.2

-9-

June, 2005

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