AS5045 View Datasheet(PDF) - austriamicrosystems AG

Part Name

Description

Manufacturer

AS5045

12 Bit Programmable Magnetic Rotary Encoder

austriamicrosystems AG 

AS5045

Data Sheet

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

Sampling rate

Transition noise (1 sigma)

Output delay

Max. speed @ 4096 samples/rev.

Max. speed @ 1024 samples/rev.

Max. speed @ 256 samples/rev.

Max. speed @ 64 samples/rev.

Slow Mode (Mode = low)

2.61 kHz (384 µs)

≤ 0.03° rms

384µs

38 rpm

153 rpm

610 rpm

2441 rpm

Fast Mode (Mode = high, VDD5V)

10.42 kHz (96µs)

≤ 0.06° rms

96µs

153 rpm

610 rpm

2441 rpm

9766 rpm

8.1 Synchronous Serial Interface (SSI)

Figure 5. Synchronous Serial Interface with Absolute Angular Position Data

CSn

tCLK FE

TCLK/2

1

8

CLK

tCLK FE

tCSn

18

1

DO

D11 D10 D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

OCF COF

LIN

Mag Mag

INC DEC

Even

PAR

D11

tDO active

tDO valid

Angular Position Data

Status Bits

tDO Tristate

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.

ƒ After a minimum time tCLK FE, data is latched into the output shift register with the first falling edge of CLK.

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

ƒ 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).

ƒ A subsequent measurement is initiated by a “high” pulse at CSn with a minimum duration of tCSn.

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Revision 1.7

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