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AS5040

10 BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

10 bit Absolute Angular Position Output

Synchronous Serial Interface SSI

CSn

t CLK FE T CLK / 2

CLK

1

8

t CSn

t CLK FE

16

1

DO

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

OCF COF

LIN

Mag

INC

Mag

DEC

Even

PAR

D9

t DO active

t DO valid

Angular position data

Status bits

t DO Tristate

Figure 4: ynchronous serial interface with absolute angular position data

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.

1. After a minimum time t CLK FE , data is latched into the

output shift register with the first falling edge of CLK.

MagINC, (Magnitude Increase) becomes HIGH, when

the magnet is pushed towards the IC, thus the magnetic

field strength is increasing.

MagDEC, (Magnitude Decrease) becomes HIGH, when

the magnet is pulled away from the IC, thus the

magnetic field strength is decreasing.

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

data.

Both signals HIGH indicate a magnetic field that is out

of the allowed range (see Table 3).

3. The serial word contains 16 bits, the first 10 bits are

the angular information D[9:0], the subsequent 6 bits

contain system information, about the validity of data

such as OCF, COF,LIN, Parity and Magnetic Field

status (increase/decrease) .

4. A subsequent measurement is initiated by a “high”

pulse at CSn with a minimum duration of tCSn.

Data Content:

D9:D0 absolute angular position data (MSB is clocked

out first)

OCF (Offset Compensation Finished), logic high

indicates the finished Offset Compensation Algorithm

COF (Cordic Overflow), logic high indicates an out of

range error in the CORDIC part. When this bit is set, the

data at D9:D0 is invalid. The absolute output maintains

the

last

valid

angular

value.

This Alarm may be resolved by bringing the magnet

within the X-Y-Z tolerance limits.

LIN (Linearity Alarm), logic high indicates that the input

field generates a critical output linearity.

When his bit is set, the data at D9:D0 may still be used,

but can contain invalid data. This Warning may be

resolved by bringing the magnet within the X-Y-Z

tolerance limits.

PAR Even Parity bit for transmission error detection of

bits 1…13 (D9…D0,OCF,COF,LIN)

MagINC MagDEC Description

0

0

No distance change

Magnetic Input Field OK

0

1

Distance increase

(Push-Release)

1

0

Distance decrease

(Push-Fn)

1

1

Magnetic Input Field

invalid – out of range

too large, too small

(Missing magnet)

Table 3: Magnetic magnitude variation indicator

Note: Pin 1 (MagINCn) and Pin 2 (MagDECn) are active low

via open drain output.

The absolute angular output is always set to a resolution of

10 bit. Placing the magnet above the chip, angular values

increase in clockwise direction by default.

Revision 1.1

www.austriamicrosystems.com

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