AS5030 8-bit Programmable Magnetic Rotary Encoder

Rev. 1.8

www.austriamicrosystems.com

Page 18 of 33

Programming in Daisy Chain mode

Programming in Daisy chain mode is possible for both 3-wire and 2-wire mode (see Figure 17 and Figure 19). For temporary

programming (soft write), no additional connections are required. Programming is executed with the respective programming

commands (see 5.2). For permanent programming, the programming voltage must be applied on pin#2 (PROG) of the device to

be programmed. It is also possible to apply the programming voltage simultaneously to all devices, as the actual programming

is only executed by a software command.

A parallel connection of all PROG-pins allows digital programming verification but does not allow analog programming

verification (see 5.4).

If analog programming verification is required, each PROG pin must be selected individually for verification.

5.4

Programming Verification

After programming, the programmed OTP bits may be

verified in two ways:

- By digital verification:

see 5.2.3). The structure of this register is the same as for

the OTP PROG or OTP WRITE commands.

- By analog verification:

PROG becomes an output, sending an analog voltage with

each clock, representing a sequence of the bits in the OTP

register. A voltage of <500mV indicates a correctly

programmed bit (“1”) while a voltage level between 2.2V and

3.5V indicates a correctly unprogrammed bit (“0”). Any

voltage level in between indicates improper programming.

Figure 23: Analog OTP verification

6 AS5030 Status Indicators

Refer to 5.2.1

6.1

C2 Status Bit

This bit represents the hardware connection of the C2 configuration pin (#15) to determine, which hardware configuration is

selected for the AS5030 in question.

C2 = low : pin C2 is low, indicating that the AS5030 is in 3-wire mode or a member of a 2-wire daisy chain connection (except

the last; see 4.21)

C2 = high: pin C2 is high, indicating that the AS5030 is in 2-wire mode and/or the last member of a 2-wire daisy chain

connection (see 4.22)

6.2

Lock Status Bit

The Lock signal indicates the ADC lock status. If Lock = low (ADC unlocked), the angle information is invalid.

To determine a valid angular signal at best performance, the following indicators should be set:

Lock = 1

AS5030 may be reduced due to the out of range condition of the magnetic field strength.

6.3

Magnetic Field Strength Indicators

The AS5030 is not only able to sense the angle of a rotating magnet, it can also measure the magnetic field strength (and hence

the vertical distance) of the magnet.

This extra feature can be used for several purposes:

•

as a safety feature by constantly monitoring the presence and proper vertical distance of the magnet

•

as a state-of-health indicator, e.g. for a power-up self test

•

as a pushbutton feature for rotate-and-push types of manual input devices

AS5030

Micro

Controller

100n

CS

CLK

DIO

+5V

VDD

VSS

VSS

C2

VDD

VDD

13

11

10

12

15

C1

VSS

3

14

I/O

Output

Output

PROG

2

V