AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.6, 03-Oct-06

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Integral Non-Linearity (INL) is the maximum deviation between actual position and indicated position.

Differential Non-Linearity (DNL) is the maximum deviation of the step length from one position to the next.

Transition Noise (TN) is the repeatability of an indicated position.

16.6 Timing Characteristics

Synchronous Serial Interface (SSI)

Parameter

Symbol

Min

Typ

Max

Unit

Note

Data output activated (logic

high)

100

ns

Time between falling edge of CSn and data output

activated

First data shifted to output

register

500

ns

Time between falling edge of CSn and first falling

edge of CLK

Start of data output

500

ns

Rising edge of CLK shifts out one bit at a time

Data output valid

357

375

394

ns

Time between rising edge of CLK and data output

valid

Data output tristate

100

ns

After the last bit DO changes back to “tristate”

Pulse width of CSn

500

ns

CSn = high; To initiate read-out of next angular

position

Read-out frequency

>0

1

MHz

Clock frequency to read out serial data

Pulse Width Modulation Output

Parameter

Symbol

Min

Typ

Max

Unit

Note

0.927 0.976

1.024

Signal period = 1025µs

PWM frequency

0.878 0.976

1.074

KHz

=1025µs

Minimum pulse width

0.95

1

1.05

µs

Position 0d; angle 0 degree

Maximum pulse width

973

1024

1075

µs

Position 1023d; angle 359.65 degree

Incremental Outputs

Parameter

Symbol

Min

Typ

Max

Unit

Note

Incremental outputs valid after

power-up

outputs valid

500

ns

Time between first falling edge of CSn after power-up

and valid incremental outputs

Directional indication valid

500

ns

Time between rising or falling edge of LSB output and

valid directional indication