AS5600-ASOM datasheet(16/44 Pages) OSRAM

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ams Datasheet

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[v1-06] 2018-Jun-20

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AS5600 − Detailed Description

Depending on the state of the R/W bit, two types of data transfer

are possible:

Data Transfer from a Master Transmitter to a Slave Receiver

The first byte transmitted by the master is the slave address,

followed by R/W = 0. Next follows a number of data bytes. The

slave returns an acknowledge bit after each received byte. If the

slave does not understand the command or data it sends a not

acknowledge (NACK). Data is transferred with the most

significant bit (MSB) first.

Data Transfer from a Slave Transmitter to a Master Receiver

The master transmits the first byte (the slave address). The slave

then returns an acknowledge bit, followed by the slave

transmitting a number of data bytes. The master returns an

acknowledge bit after all received bytes other than the last byte.

At the end of the last received byte, a NACK is returned. The

master generates all of the SCL clock periods and the START and

STOP conditions. A transfer is ended with a STOP condition or

with a repeated START condition. Because a repeated START

condition is also the beginning of the next serial transfer, the

bus is not released. Data is transferred with the most significant

bit (MSB) first.

AS5600 Slave Modes

Slave Receiver Mode (Write Mode)

Serial data and clock are received through SDA and SCL. Each

byte is followed by an acknowledge bit or by a not acknowledge

depending on whether the address-pointer selects a valid

address. 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 START condition. The 7-bit

AS5600 address is 0x36 (0110110 in binary).

The 7-bit slave address is followed by the direction bit (R/W),

which, for a write, is 0 (low). After receiving and decoding the

slave address byte the slave device drives an acknowledge on

SDA. After the AS5600 acknowledges the slave address and

write bit, the master transmits a register address (word address)

to the AS5600. This is loaded into the address pointer on the

AS5600. If the address is a valid readable address, the AS5600

answers by sending an acknowledge (A bit low). If the address

pointer selects an invalid address, a not acknowledge is sent (A

bit high). The master may then transmit zero or more bytes of

data. If the address pointer selects an invalid address, the

received data are not stored. The address pointer will increment

after each byte transferred whether or not the address is valid.

If the address-pointer reaches a valid position again, the

AS5600 answers with an acknowledge and stores the data. The

master generates a STOP condition to terminate the write

transaction.

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