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PT2258-S Datasheet(PDF) 9 Page - Princeton Technology Corp |
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PT2258-S Datasheet(HTML) 9 Page - Princeton Technology Corp |
9 / 17 page Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2258 V1.2 - 9 - July, 2005 6-Channel Electronic Volume Controller IC 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 Ack11000000Ack 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 11010100 ACK 111 0 0 0 1 0 Ack Stop PT2258 Address -40dB -2dB Start 1 0 0 0 1 0 0 0 Ack 11100010 Ack 1101 0 1 0 0 ACK Stop PT2258 Address -2dB -40dB The two methods above are both acceptable. Warning!! The following transmission method is not permitted. Send only a 10dB attenuation value: Start 1 0 0 0 1 0 0 0 Ack11010100ACK Stop PT2258 Address -40dB Send only a 10dB attenuation value: Start 1 0 0 0 1 0 0 0 Ack11100010ACK 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 0 010 Ack 111 11001 ACK 1 1 0 1 0 100 ACK Stop PT2258 Address -2dB All CH mute -40dB |
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