AS5601-ASOT datasheet(17/43 Pages) AMSCO

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[v1-02] 2014-Oct-29

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AS5601 − Detailed Description

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 AS5601 will drive data on SDA. START and STOP conditions

are recognized as the beginning and end of a bus transaction.

The slave address byte is the first byte received after the master

generates a START condition. The slave address byte contains

the 7-bit AS5601 address. The 7-bit slave address is followed by

the direction bit (R/W), which, for a read, is 1 (high). After

receiving and decoding the slave address byte, the slave device

drives an acknowledge on the SDA line. The AS5601 then begins

to transmit data starting with the register address pointed to

by the address pointer. If the address pointer is not written

before the initiation of a read transaction, the first address that

is read is the last one stored in the address pointer. The AS5601

must receive a not acknowledge (NACK) to end a read

transaction.

Figure 17:

Data Read (Slave Transmitter Mode)

0110110

XXXXXXXX

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

<Data(n)>

<Data(n+1)>

<Data(n+X)>

XXXXXXXX

<Data(n+2)>

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