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AS5134

Data Sheet - D e ta i l e d D e s c r i p t i o n

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).

Low/Mid Power Mode

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

and the power consumption is reduced to max. 1,5 mA. Start-up from this mode to normal operation can be

accomplished within 250µs. This mode is recommended for applications, where mid power, but fast start-up and short

reading cycle intervals are required.

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 12) or the optional 2-wire interface(see Figure

5). For permanent programming (command PROG OTP, #25), a constant DC voltage of 8.0 – 8.5V (=100mA) must be

connected to pin 1 (PROG). For temporary OTP write (“soft write”; command WRITE OTP, #31), the programming

voltage is not required.

Figure 12. OTP Programming Connection

Programming Verification

After programming, the programmed OTP bits may be verified in two ways:

By Digital Verification: This is simply done by sending a READ OTP command (#15). The structure of this register is

the same as for the OTP PROG or OTP WRITE commands.

By Analog Verification: By sending an ANALOG OTP READ command (#9), pin 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.

+5V

VDD

VDD

CS

DCLK

DIO

VSS

VSS

C2

100n

VSS

VDD

I/O

Output

Output

PROG

8.0 – 8.5V

10µF100n

+