as5030 austriamicrosystems, as5030 Datasheet - Page 15

• Manufacturer Part Number: as5030
• Description: 8-bit High-speed Absolute Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5030 8-bit Programmable Magnetic Rotary Encoder
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
5.1
The AS5030 has an integrated 18 Bit OTP ROM for configuration purposes.
5.1.1
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.
5.1.2
These temporary programming options are also carried out over the serial interface. See 5.2.2.
Rev. 1.8
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AS5030 Programming
Programming Options
OTP Programming options
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.
The 8-bit user programmable zero position can be applied both temporarily (command WRITE OTP, #1F
permanently (command PROG OTP, #19
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.
The 2-bit user programmable sensitivity setting can be applied both temporarily (command WRITE OTP, #1F
permanently (command PROG OTP, #19
Reduced Power mode programming options
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.
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.
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