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[v1-07] 2016-Sep-09

AS5601 − Detailed Description

AS5601 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 NACK 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 in the first byte

received after the START condition. The 7-bit AS5601 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 AS5601 acknowledges the slave address and

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

to the AS5601. This is loaded into the address pointer on the

AS5601. If the address is a valid readable address, the AS5601

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

pointer selects an invalid address, a NACK 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 AS5601 answers with

an acknowledge and stores the data. The master generates a

STOP condition to terminate the write transaction.

Figure 16:

Data Write (Slave Receiver Mode)

0110110

0 A

XXXXXXXX

S – Start

A – Acknowledge (ACK)

Data transferred: X+1 Bytes + Acknowledge

P – Stop

<Data(n)>

<Data(n+X)>

XXXXXXXX

<Data(n+1)>

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