AS5045-ASST datasheet(19/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

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AS5045 − Detailed Description

Daisy Chain Mode

The Daisy Chain mode allows connection of several AS5045’s in

series, while still keeping just one digital input for data transfer

(see “Data IN” in Figure 17). This mode is accomplished by

connecting the data output (DO; pin 9) to the data input (PROG;

pin 8) of the subsequent device. An RC filter must be

implemented between each PROG pin of device n and DO pin

of device n+1, to prevent then magnetic position sensors to

enter the alignment mode, in case of ESD discharge, long

cables, not conform signal levels or shape. Using the values

R=100R and C=1nF allow a max. CLK frequency of 1MHz on the

whole chain. The serial data of all connected devices is read

from the DO pin of the first device in the chain. The length of

the serial bit stream increases with every connected device, it

is n * (18+1) bits: For e.g., 38 bit for two devices, 57 bit for three

devices, etc.

The last data bit of the first device (Parity) is followed by a

dummy bit and the first data bit of the second device (D11), etc.

(see Figure 18).

Figure 17:

Daisy Chain Hardware Configuration

Figure 18:

Daisy Chain Mode Data Transfer

CSn

PROG

CLK

CSn

CLK

CSn

CLK

PROG

CSn

CLK

PROG

100R

1nF

GND

MCU

AS5045

CSn

CLK

tDO valid

Angular Position Data

tDO active

Status Bits

tCLK FE

TCLK/2

D8 D7

D6 D5

D4 D3

D2 D1

D0 OCF COF LIN

Mag

INC

Mag

DEC

Even

PAR

D11

D10 D9

Angular Position Data

1st Device

2nd Device

D10

D11

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