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AS5134

Datasheet - Application In form atio n

8 Application Information

The benefits of AS5134 are as follows:

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Complete system-on-chip, no angle calibration required

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Flexible system solution provides absolute serial, ABI, UVW and PWM outputs

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Ideal for applications in harsh environments due to magnetic sensing principle

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High reliability due to non-contact sensing

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Robust system, tolerant to horizontal misalignment, airgap variations, temperature variations and external magnetic fields

8.1 AS5134 Programming

The AS5134 offers the following user programmable options:

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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 8,5-bit

user programmable zero position can be applied both temporarily (command WRITE OTP, #31) or permanently (command PROG OTP, #25).

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magnetic field range of the AS5134 by setting the sensitivity level. The 2-bit user programmable sensitivity setting can be applied both

temporarily (command WRITE OTP, #31) or permanently (command PROG OTP, #25).

8.1.1 OTP Programming Connection

Programming of the AS5134 OTP memory does not require a dedicated programming hardware. The programming can be simply accomplished

over the serial 3-wire interface (see Figure 17) or the optional 2-wire interface (see Figure 6). For permanent programming (command PROG

OTP, #25), a constant DC voltage of 8.0-8.5V must be connected to pin 1 (PROG). For temporary OTP write (“soft write”; command WRITE OTP,

#31), the programming voltage is not required. The capacitors must be as close as possible to the pin, to ensure that a serial inductance of 50nH

is not to be exceeded. The 50nH inductance could translate into a cable length of approximately 5cm.

Figure 16. OTP Programming Connection

+5V

VDD

VDD

CS

DCLK

DIO

VSS

VSS

C2

100nF

VSS

VDD

I/O

Output

Output

PROG

8.0 – 8.5V

+

-