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AS5134
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
8 Application Information
The benefits of AS5134 are as follows:
?? Complete system-on-chip, no angle calibration required
?? Flexible system solution provides absolute serial, ABI, UVW and PWM outputs
?? Ideal for applications in harsh environments due to magnetic sensing principle
?? High reliability due to non-contact sensing
?? 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:
?? 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 8,5-bit
user programmable zero position can be applied both temporarily (command WRITE OTP, #31) or permanently (command PROG OTP, #25).
?? 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 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
Output
Output
CS
DCLK
VDD
I/O
8.0 – 8.5V
DIO
PROG
100nF
VSS
+
-
C2
VSS
VSS
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