AS5030 8-bit Programmable Magnetic Rotary Encoder

Rev. 1.8

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Page 15 of 33

The total number of serial bits is: n*21, where n is the number of connected devices. Note that this configuration requires one

extra clock (#1) to initiate the generation of the CS signal for the first device. After reading the last device, the communication

must be reset back to the first device by introducing a timeout of CLK (no rising edge for >24µs)

Figure 20: Timing diagram in 2-wire Daisy Chain mode

5 AS5030 Programming

5.1

Programming Options

The AS5030 has an integrated 18 Bit OTP ROM for configuration purposes.

5.1.1

OTP Programming options

The OTP programming options can be set permanently by programming or temporarily by overwriting. Both methods are carried

out over the serial interface, but with different commands (WRITE OTP, PROG OTP, see 5.2.4).

Note: During the 18bit OTP programming, each bit needs 4 clock pulses to be validated.

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Zero Position Programming

This programming option allows the user to program any rotation angle of the magnet as the new zero position. This

useful feature simplifies the assembly process as the magnet does not need to be mechanically adjusted to the

electrical zero position. It can be assembled in any rotation angle and later matched to the mechanical zero position

by zero position programming.

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Magnetic Field Optimization

This programming option allows the user to match the vertical distance of the magnet with the optimum magnetic field

range of the AS5030 by setting the sensitivity level.

5.1.2

Reduced Power mode programming options

These temporary programming options are also carried out over the serial interface. See 5.2.2.

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Low Power Mode

Low Power Mode is a power saving mode with fast start-up. In Low Power Mode, all internal digital registers are frozen

and the power consumption is reduced to max. 1.5mA. The serial interface remains active. Start-up from this mode to

normal operation can be accomplished within 150µs. This mode is recommended for applications, where low power,

but fast start-up and short reading cycle intervals are required.

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Ultra Low Power Mode

Ultra Low Power Mode is a power saving mode with even reduced power-down current consumption. In this mode, all

chip functions are frozen and the power consumption is reduced to max. 50µA. The serial interface remains active.

Start-up from this mode to normal operation can be accomplished within 500µs. This mode is recommended for

applications, where very low average power consumption is required, e.g. for battery operated equipment. For

example, in a cycled operation with 10 readings per second, the average power consumption of the AS5030 can be

reduced to only 120µA.