AS5020

Rev. n/c

Page 5/11

Feb 2001

PD/CS

CLK

DATA

D4

D0

Latch

actual value

Next

value

12

78

9

D5

NVR

Parity

D5

D4 D0

NVR

Parity

D5

angle 1

angle 2

angle n

Figure 3 Daisy Chain read out

Zero Position Programming

A simple single pin programming allows changing the initial zero position. It is easy to program

permanently a new zero-reference into the internal OTP (one time programmable) ROM. This

allows a fast and economic magnet placement since the intrinsic orientation is not important.

Single Pin Programming is provided via the PROG pin. Fig.4 shows the typical programming

sequence needed for fixing the new zero position.

Zero Position Programming Sequence

Before calibration, the new zero position must be adjusted in measurement mode (PD/CS=0).

The rising edge of PD/CS gets the actual position and stores it internally for the permanent

programming. A high level at the PROG Pin during power-down (PD/CS=1) with a minimum

duration of 300

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select the latched position information and zap the reference value into the OTP ROM.

Continuous Read Out Mode Selection

An optional 9

be used to set Continuous Read Out Mode (see Fig.4).

PROG [V]

8

0

t

Initialisation

Zero Position Programming

12

3

4

Bit 0

Bit 1

Bit 3

Bit 2

Bit 5

Bit 4

56

78

Optional

Cont.

Mode

Dummy

Calibration Position

Latched

Measurement

Enable

CS

Enable

Programming

Figure 4 Programming sequence

Note: Daisy Chain configuration is not possible in Continuous Read Out Mode.