HAL1820UA-A Просмотр технического описания (PDF) - Micronas

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HAL1820UA-A

Programmable Linear Hall Effect Sensor

Micronas 

DATA SHEET

HAL 1820

TC and TCSQ

The temperature dependence of the magnetic sensitiv-

ity can be adapted to different magnetic materials in

order to compensate for the change of the magnetic

strength with temperature. The adaption is done by

programming the TC (Linear Temperature Coefficient)

and the TCSQ registers (Quadratic Temperature Coef-

ficient). Thereby, the slope and the curvature of the

temperature dependence of the magnetic sensitivity

can be matched to the magnet and the sensor assem-

bly. As a result, the output signal characteristic can be

fixed over the full temperature range. The sensor can

compensate for linear temperature coefficients ranging

from about 3100 ppm/K up to 2550 ppm/K and qua-

dratic coefficients from about 7 ppm/K2 to 15 ppm/K2

(typical range). Min. and max. values for quadratic

temperature coefficient depend on linear temperature

coefficient. Please refer to Section 4.4. on page 22 for

the recommended settings for different linear tempera-

ture coefficients.

Magnetic Offset Alignment Bit (OALN)

Please refer to Section 2.2.1. on page 8 (OFFSET).

LOCK

By setting this 1-bit register, all registers will be locked,

and the EEPROM content can not be changed any-

more. It is still possible to read all register content by

sending a read command to the sensor. The LOCK bit

is active after the first power-off and power-on

sequence after setting the LOCK bit.

Warning: This register cannot be reset!

2.2.3. Customer register III and IV

Customer register III and IV contain 16 bits each.

These two registers can be read by the customer and

Micronas will use this register to store production infor-

mation like wafer position, wafer number and produc-

tion lot number.

Micronas

July 3, 2013; DSH000158_003EN

9

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