AS3661 datasheet(25/87 Pages) AMSCO

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AS3661

Datasheet - D e t a i l e d D e s c r i p t i o n

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 AS3661 while the serial clock is input on SCL. START and STOP conditions are recognized

as the beginning and end of a serial transfer (Figure 26 and Figure 27). The slave address byte is the first byte

received after the master generates a START condition. The slave address byte contains the 7-bit AS3661

address, which is 0110010, followed by the direction bit (R/W), which, for a read, is 1.

After receiving and

decoding the slave address byte the device outputs an acknowledge on the SDA line. The AS3661 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 24). 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 AS3661 must receive a “not acknowledge” to end a read.

Figure 26. Data Write - Slave Receiver Mode

Figure 27. Data Read (Write Pointer, Then Read) - Slave Receive and Transmit

4. The address for read mode from the AS3661 is 8Xh+1 = 01100101b - see Table 5

0110010

XXXXXXXX

<Data(n)>

<Data(n+1)>

<Data(n+X)>

S - Start

A - Acknowledge (ACK)

P - Stop

Data Transferred

(X + 1 Bytes + Acknowledge)

0110010

XXXXXXXX

0110010

<Data(n+2)>

S - Start

Sr - Repeated Start

A - Acknowledge (ACK)

P - Stop

NA -Not Acknowledge (NACK)

XXXXXXXX

<Data(n)>

<Data(n+1)>

<Data(n+X)>

Data Transferred

(X + 1 Bytes + Acknowledge)

Note: Last data byte is followed by a NACK

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