AS5013 datasheet(19/50 Pages) AMSCO

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AS5013 − Detailed Description

the START and STOP conditions. A transfer is ended with

a STOP condition or with a repeated START condition.

Since 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.

The AS5013 can operate in the following two 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 the address-pointer pointing to a valid

position). START and STOP conditions are recognized as

the beginning and end of a serial transfer. Address

recognition is performed by hardware after reception of

the slave address and direction bit (see Figure 18). The

slave address byte is the first byte received after the START

condition. The slave address byte contains the 7-bit

AS5013 address, which is stored in the OTP memory.The

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

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

slave address byte the device outputs an acknowledge on

the SDA. After the AS5013 acknowledges the slave address

+ write bit, the master transmits a register address to the

AS5013. This sets the address pointer on the AS5013. If the

address is a valid readable address the AS5013 answers by

sending an acknowledge. If the address-pointer points to

an invalid position a “not acknowledge” is sent. The master

may then transmit zero or more bytes of data. In case of

the address pointer pointing to an invalid address the

received data are not stored. The address pointer will

increment after each byte transferred independent from

the address being valid. If the address-pointer reaches a

valid position again, the AS5013 answers with an

acknowledge and stores the data. The master generates a

STOP condition to terminate the data write.

Figure 18:

Data Write - Slave Receiver Mode

• 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 transmitted on

100000Y

XXXXXXXX

XXXXXXXX NA

S – Start

A – Acknowledge (ACK)

Data transferred: X+1 Bytes + Acknowledge

P – Stop

Y – State of pin ADDR

<Data(n)>

<Data(n+X)>

XXXXXXXX

<Data(n+1)>

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