DATA SHEET

HAL 1860

TDK-Micronas GmbH

May 4, 2017; DSH000187_001EN

9

3.2. Digital Signal Processing and EEPROM

The DSP is a key function of this sensor and performs the signal conditioning. The

parameters for the DSP are stored in the EEPROM registers. Details are shown in

Fig. 3–2 on page 8.

The measurement data can be readout from the digital output register MDATA.

MDATA register

This 16-bit register delivers the actual digital value of the applied magnetic field after the

signal processing. This register can only be read out, and it is the basis for the calibra-

tion procedure of the sensor in the customer application. Only 10 bits of the register

contain valid data. The MDATA range is from

512 to 511.

For SENSITIVITY = 1 the MDATA value will increase for negative magnetic fields (north

pole) on the branded side of the package (positive MDATA values).

Note

During application design, it shall be taken into consideration that the

MDATA value should not saturate in the full operational range of the spe-

cific application.

The area in the EEPROM accessible to the customer consists of registers with a size of

16 bit each.

3.2.1. Output Scaling Register

The Output Scaling register contains the bits for magnetic sensitivity (SENSITIVITY)

and magnetic offset (OFFSET).

SENSITIVITY

The SENSITIVITY bits define the parameter for the multiplier in the DSP and is pro-

grammable between [

2...2] in steps of 0.0156. SENSITIVITY = 1 (@ Offset = 0) corre-

sponds to full-scale of the output signal if the A/D-converter value has reached the full-

scale value. The SENSITIVITY register has a resolution of 8 bits.

OFFSET

The OFFSET bits define the parameter for the adder in the DSP.

The customer can decide if the offset is MSB aligned or LSB aligned. The MSB or LSB

alignment is enabled by an additional offset alignment bit (OFFSET_ALIGN). In case this

bit is set to 1, the offset is programmable from

25% up to 25% of V

OFFSET_ALIGN bit is set to zero, then the offset covers only 1/8 of the full-scale (

6.25%