AS3665 datasheet(43/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n I

2C mode Serial Data Bus

see also Blockwrite/read boundaries on page 43), with the AS3665 acknowledging each byte received. The

address pointer will increment after each data byte is transferred. The master generates a STOP condition to

terminate the data write.

2. Slave Transmitter Mode (Read Mode): The first byte is received and handled as in the slave receiver mode.

However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmit-

ted on SDA by the AS3665 while the serial clock is input on SCL. START and STOP conditions are recognized

as the beginning and end of a serial transfer (Figure 23 and Figure 24). The slave address byte is the first byte

received after the master generates a START condition. The slave address byte contains the 7-bit AS3665

address, which is 1000XXX, followed by the direction bit (R/W), which, for a read, is 1.

12 After receiving and

decoding the slave address byte the device outputs an acknowledge on the SDA line. The AS3665 then

begins to transmit data starting with the register address pointed to by the register pointer (if more than one

data byte is read see also Blockwrite/read boundaries on page 43). If the register pointer is not written to

before the initiation of a read mode the first address that is read is the last one stored in the register pointer.

The AS3665 must receive a “not acknowledge” to end a read.

Figure 22. Data Write - Slave Receiver Mode

Figure 23. Data Read (from Current Pointer Location) - Slave Transmitter Mode

12.The address for read mode from the AS3665 is 8Xh+1 = 1000XXX1b - see Table 53

1000XXX

XXXXXXXX

<Data(n)>

<Data(n+1)>

<Data(n+X)>

S - Start

A - Acknowledge (ACK)

P - Stop

Data Transferred

(X + 1 Bytes + Acknowledge)

1000XXX

XXXXXXXX

<Data(n)>

<Data(n+1)>

<Data(n+X)>

S - Start

A - Acknowledge (ACK)

P - Stop

NA - Not Acknowledge (NACK)

Data Transferred

(X + 1 Bytes + Acknowledge)

Note: Last data byte is followed by a NACK

<Data(n+2)>

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