AS5045

Data Sheet

www.austriamicrosystems.com

Revision 1.7

13 – 33

8

Mode Input Pin

The mode input pin activates or deactivates an internal filter that is used to reduce the analog output noise.

Activating the filter (Mode pin = LOW) provides a reduced output noise of 0.03° rms. At the same time, the output

delay is increased to 384µs. This mode is recommended for high precision, low speed applications.

Deactivating the filter (Mode pin = HIGH) reduces the output delay to 96µs and provides an output noise of 0.06°

rms. This mode is recommended for higher speed applications.

The MODE pin should be set at power-up. A change of the mode during operation is not allowed.

Switching the Mode pin affects the following parameters:

Table 2.

Slow and Fast Mode Parameters 12-bit Absolute Angular Position Output

Parameter

Slow Mode (Mode = low)

Fast Mode (Mode = high, VDD5V)

Sampling rate

2.61 kHz (384 µs)

10.42 kHz (96µs)

Transition noise (1 sigma)

≤ 0.03° rms

≤ 0.06° rms

Output delay

384µs

96µs

Max. speed @ 4096 samples/rev.

Max. speed @ 1024 samples/rev.

Max. speed @ 256 samples/rev.

Max. speed @ 64 samples/rev.

38 rpm

153 rpm

610 rpm

2441 rpm

153 rpm

610 rpm

2441 rpm

9766 rpm

8.1

Synchronous Serial Interface (SSI)

Figure 5. Synchronous Serial Interface with Absolute Angular Position Data

D11

1

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

OCF COF

LIN

Mag

INC

Mag

DEC

Even

PAR

D11

1

18

8

t

CLK FE

t

CSn

t

DO Tristate

Status Bits

Angular Position Data

t

DO valid

t

DO active

T

CLK/2

t

CLK FE

CSn

DO

CLK

If CSn changes to logic low, Data Out (DO) will change from high impedance (tri-state) to logic high and the read-out

will be initiated.

Each subsequent rising CLK edge shifts out one bit of data.

The serial word contains 18 bits, the first 12 bits are the angular information D[11:0], the subsequent 6 bits

contain system information, about the validity of data such as OCF, COF, LIN, Parity and Magnetic Field status

(increase/decrease).