PT2319 Просмотр технического описания (PDF) - Princeton Technology

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PT2319

Audio Processor IC

Princeton Technology 

Audio Processor IC

INPUT SELECTOR DEFINITIONS

D28 D29 D32 Operation

0 0 1 L1 (R1) ON

1 0 1 L2 (R2) ON

0 1 1 L3 (R3) ON

1 1 1 L4 (R4) ON

0 0 0 L5 (R5) ON

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Fax: 886-2-29174598

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

PT2319

IMPORTANT USER NOTES

SOFTWARE PROGRAMMING NOTES

Notes:

1. Internal registers are not in a set condition when the IC is powered on. To ensure that unusual noise

will not be output, it is suggested that an external muting circuit is added before the control codes

are sent.

2. After the IC has been powered on, send the IC a “clear register” code (to clear the register: D33 =

D34 = 0) followed by initialization values for each register in order.

3. PT2319 control codes constitute a 52-bit signal. Each time a control code is sent, all data in the

registry must be written into. When it is necessary to access only one function (for example, volume

control only), it is allowed to change only the corresponding register data (in this example, D16 to

D23) while the remaining registers are sent original unchanged data.

CIRCUIT LAYOUT NOTES

Notes:

1. To ensure that the 3-wire bus line signals (DI, CL, CE) do not interfere with the audio signals, when

designing the circuit layout: 1) place the bus line at a sufficient distance from the audio path, and 2)

the bus line and audio path should not be parallel. In addition to this, use a shielded ground pane or

use a shielded cable to deliver signals to the interface.

2. To minimize interference between different voltage levels, please ensure that analog and digital

grounds are separate. Analog grounds such as PT2319 GND and output terminal grounds should

be connected together. The display shield, MCU, key scanning signal and remote control receiver

decoder should be connected to a separate ground path. Finally, connect the two grounds at the

power supply GND point.

PT2319 V1.4

- 10 -

December, 2005

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