7314 Просмотр технического описания (PDF) - Princeton Technology

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7314

4-Channel Input Audio Processor

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4-Channel Input Audio Processor

7314

ACKNOWLEDGE

During the Acknowledge Clock Pulse, the master (µP) puts a resistive HIGH level on the DATA Line.

The peripheral (audio processor) that acknowledges has to pull-down (LOW) the DATA line during the

Acknowledge Clock Pulse so that the DATA Line is in a Stable Low State during this Clock Pulse.

Please refer to the diagram below.

CLK

1

2

3

4

7

8

9

DATA

MSB

START

AC KNOWLED GE MENT

FROM RECE IV ER

The audio processor that has been addressed has to generate an acknowledge after receiving each

byte, otherwise, the DATA Line will remain at the High Level during the ninth (9th) Clock Pulse. In this

case, the master transmitter can generate the STOP Information in order to abort the transfer.

TRANSMISSION WITHOUT ACKNOWLEDGE

If you want to avoid the acknowledge detection of the audio processor, a simpler µP transmission may

be used. Wait one clock and do not check the slave acknowledge of this same clock then send the new

data. If you use this approach, there are greater chances of faulty operation as well as decrease in

noise immunity.

INTERFACE PROTOCOL

The interface protocol consists of the following (see diagram below):

• A Start Condition

• A Chip Address Byte including the 7314 address. The 8th Bit of the Byte must be “0”. 7314 must

always acknowledge the end of each transmitted byte.

• A Data Sequence (N-Bytes + Acknowledge)

• A Stop Condition

7314 Address

MSB First Byte

LSB

MSB

LSB MSB

LSB

START 1 0 0 0 1 0 0 0 ACK

DATA

ACK

DATA

ACK

DATA TRANSMITTED (N-BYTES+ACKNOWLEDGE)

STOP

Note:

ACK = ACKNOWLEDGE

MAX. CLOCK SPEED = 100KBITS/S

7314 V1.0

-6-

January, 2007

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