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AS5510

Datasheet - Detailed Descr i p ti on

Figure 7. Data Write - Slave Receiver Mode

direction bit indicates that the transfer direction is reversed. Serial data is transmitted on SDA by the AS5510 while the serial clock is input on

SCL. START and STOP conditions are recognized as the beginning and end of a serial transfer (Figure 8 and Figure 9). The slave address byte

is the first byte received after the master generates a START condition. The slave address byte contains the 7-bit AS5510 address. The 7-bit

slave address is 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 AS5510 then begins to transmit data starting with the register address pointed to by the register

pointer. 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 AS5510 must receive a “not acknowledge” to end a read.

Figure 8. Data Read (from Current Pointer Location) - Slave Transmitter Mode

S

1010110

0

A

XXXXXXXX

A

XXXXXXXX

A

XXXXXXXX

NA

S – Start

A – Acknowledge (ACK)

Data transferred: X+1 Bytes + Acknowledge

P – Stop

P

<Slave address>

<Word address (n)>

<Data(n)>

<Data(n+X)>

XXXXXXXX

A

<Data(n+1)>

S

1010110

1

A

XXXXXXXX

A

XXXXXXXX

A

XXXXXXXX

NA

S – Start

A – Acknowledge (ACK)

Data transferred: X+1 Bytes + Acknowledge

NA – Not Acknowledge (NACK)

Note: Last data byte is followed by NACK

P – Stop

P

<Slave address>

<Data(n)>

<Data(n+1)>

<Data(n+X)>

XXXXXXXX

A

<Data(n+2)>