AS5132 datasheet(12/40 Pages) AMSCO

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[v2-06] 2016-Jan-26

AS5132 − Detailed Description

Synchronous Serial Interface (SSI)

The absolute angle data can be read out over the synchronous

serial interface using the pins CSN, DIO and CLK. It is a

bidirectional interface therefore a read or write access is

possible. The organization of the protocol is byte wise and starts

with the command byte followed by the data information.

Figure 14:

Read / Write Serial Data Transmission

Figure 14 shows the connection of the AS5132 to a micro

controller. Depending on the command byte are different

access types possible. In normal mode the number of clocks is

equal the number of data bits.

Figure 15:

Data Organization of the SSI Protocol 16-Bit Data

* DIO output pin is connected internally to the VDDP voltage domain. VDD and VDDP can be separately

connected too.

** Recommend pull-up resistor (typ. 10kOhm)

***Depending on the use case:

- Application use case (connection to VDD or leave unconnected. Capacitive load during operation

and startup not allowed)

- Programming use case (see Figure 24)

100nF

VDD

Micro-

Controller

VSS

AS5132

Typ. 10kOhm**

CSN

VDDP* VDD

Output

VSS

+5V

VDD

PROG***

I/0

DIO

CLK

Output

Command Byte

W Data

MSB

LSB MSB

LSB

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