AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

Revision 1.1

www.austriamicrosystems.com

Page 10 of 33

8 Two Wire Serial Interface

The AS5046 is accessible via an bi-directional serial interface.

CSn must be low during serial data transmission.

8.1

Serial Interface Timing Diagrams

The registers in the AS5046 are available in a data length of 8 bit (1 byte), 24 bit (3 bytes) and 32 bit (4 bytes).

Shown below in Figure 6 is a common 8-bit data transfer.

Figure 6: 8-bit serial Read / Write timing

Figure 7 shows a transfer timing diagram for the first 16 bits of the Serial Interface Unit.

Figure 7: 16-bit serial Read / Write timing

9 Accessible Registers for Serial Interface

Status Register

Internal

Type

Identifier

Internal

Address

Register

Bit

Count

Read /

Write

Note

10 bit angle <upper 10bits: D11:D2>

6 bit status

8 bit magnitude

Serial Interface Unit

0101

000

Programmable with

32

Read only

2 bit angle <lower 2 bits: D1:D0>

Hall Sensor Front End

0001

000 -111 fixed address range

8

Read / Write

8 selectable Hall front-end status

registers

ADC outputs, SIN/COS

signal bus

0100

000

fixed address

24

Read / Write

2)

12bit SIN , 12bit COS input

Automatic Gain Control 0111

000

Fixed address

8

Read / Write

3)

AGC Counter

Table 2: Serial register overview