AS5147 datasheet(13/35 Pages) AMSCO

13 / 35 page

ams Datasheet: 2014-Jun-27 [v1-04]

AS5147 – 13

Detaile d Desc rip t ion

Figure 17:

SPI Write Data Frame

The parity bit PARD must be calculated from the 16-bit data.

In an SPI write transaction, the write command frame (e.g. Write

ADD[n]) is followed by a data frame (e.g. DATA [x]). In addition

to writing an address in the AS5147, a write command frame

causes the old contents of the addressed register (e.g. DATA [y])

to be sent on MISO in the following frame. This is followed by

the new contents of the addressed register (DATA [x]) as shown

in Figure 19.

Figure 18:

SPI Write Transaction

Bit

Name

Description

PARD

Parity bit (even)

Always low

13:0

DATA

Data

Write ADD[n]

CSn

MOSI

MISO

DATA (x)

DATA (y)

Write (ADDm)

DATA (p)

Next command

DATA (y)

DATA (x)

Command

Data to write into ADD[n]

Data content of ADD[n]

New Data content

of ADD[n]

Data content of ADD[m]

New Data content

of ADD[m]

Data to write into ADD[n]

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