HAL-APB-V1.5 Datasheet, PDF (43/59 Pages) Micronas – Application Board HAL-APB V1.x

APPLICATION NOTE
HAL1820, HAL24xy, HAL28xy, HAL36xy, HAL38xy
Application Board HAL-APB V1.x
11. HAL 283x / HAL 2850
The HAL 283x/HAL2850 are universal magnetic field sensors with SENT/PWM output,
based on the Hall effect. Magnetic field, perpendicular to the branded side of the sen-
sor provides a output signal direct proportional to the applied magnetic flux through the
Hall plate. Details on features and specification are described in the data sheet.
11.1. Programming interface
The sensor can be programmed via output voltage modulation. The sensor answers
with a modulation of the output voltage.
A logical “0“ is coded as no level change within the bit time. A logical “1“ is coded as a
level change of typically 50% of the bit time. After each bit, a level change occurs (see
Fig. 11–1).
The serial telegram is used to transmit the EEPROM content, error codes and digital
values of the magnetic field from and to the sensor.
t_bbit
t_bbit
or
logical 0
logical 1
t_bbit
or
t_bhb t_bhb
t_bbit
t_bhb t_bhb
Fig. 11–1: Definition of logical 0 and 1 bit
Micronas
Oct. 8, 2012; APN000055_003EN
43