HAR2425 datasheet(10/33 Pages) MICRONAS

10 / 33 page

HAR 24xy

DATA SHEET

July 14, 2015; DSH000170_001EN

Micronas

3.2.2. Register Definition

The DSP is the major part of each die and performs

the signal conditioning. The parameters for the DSP

are stored in the EEPROM registers. The details are

shown in Fig. 3–5 and Fig. 3–7.

Terminology:

GAIN: Name of the register or register value

Gain: Name of the parameter

The sensors signal path contains two kinds of regis-

ters. Registers that are readout only (RAM) and pro-

grammable registers (EEPROM & NVRAM). The RAM

registers contain measurement data at certain posi-

tions of the signal path and the EEPROM registers

have influence on the sensors signal processing.

3.2.2.1. RAM registers

TEMP_ADJ

The TEMP_ADJ register contains the calibrated tem-

perature sensor information. TEMP_ADJ can be used

for the sensor calibration over temperature. This regis-

ter has a length of 16 bit and it is two’s-complement

coded. Therefore the register value can vary between

32768...32767.

CFX

The CFX register is representing the magnetic field

information directly after A/D conversion, decimation

filter and magnetic range (barrel shifter) selection. The

temperature variation of this register is specified in

Section 4.14. on page 28 by the parameter RANGEABS.

Note: During application design, it must be taken into

consideration that CFX should never overflow in

the operational range of the specific application

and especially over the full temperature range.

In case of a potential overflow the barrel shifter

should be switched to the next higher range.

This register has a length of 16 bit and it is two’s-com-

plement coded. Therefore the register value can vary

between

32768...32767. CFX register values will

increase for positive magnetic fields (south pole) on

the branded side of the package (positive CFX values)

and it will decrease with negative magnetic field polarity.

MIC_COMP

The MIC_COMP register is representing the magnetic

field information directly after the Micronas tempera-

ture trimming. The register content is temperature

compensated and has a typical gain drift over temper-

ature of 0 ppm/k. Also the offset and its drift over tem-

perature is typically zero. The register has a length of

16 bit and it is two’s-complement coded. Therefore the

32768...32767.

CUST_COMP

The CUST_COMP register is representing the mag-

netic field information after the customer temperature

trimming. For HAR 2425 it is possible to set a cus-

tomer specific gain of second order over temperature

as well as a customer specific offset of first order over

temperature. The customer gain and offset can be set

with the EEPROM registers TCCO0, TCCO1 for offset

and TCCG0...TCCG2 for gain. Details of these regis-

ters are described on the following pages.

The register has a length of 16 bit and it is two’s-com-

plement coded. Therefore the register value can vary

between

32768...32767.

SETPT_IN

The SETPT_IN register offers the possibility to read

the magnetic field information after the scaling of the

input signal to the input range of the linearization

block. For further details see the description of the

EEPROM

registers

SCALE_GAIN

and

SCALE_OFFSET that are described in the next chap-

ter.

The register has a length of 16 bit and it is two’s-com-

plement coded. Therefor the register value can vary

between

32768...32767.

SETPT

The SETPT register offers the possibility to read the

magnetic field information after the linearization of the

magnetic field information with 16 setpoints. This infor-

mation is also required for the correct setting of the

sensors DAC GAIN and OFFSET in the following

block.

The register has a length of 16 bit and it is two’s-com-

plement coded. Therefore the register value can vary

between

32768...32767.

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