HAR2425 datasheet(31/33 Pages) MICRONAS

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DATA SHEET

HAR 24xy

Micronas

July 14, 2015; DSH000170_001EN

6. Programming of the Sensor

HAR 24xy features two different customer modes. In

Application Mode the sensor provides an output sig-

nal. In Programming Mode it is possible to change

the register settings of the sensor.

After power-up the sensor is always operating in the

Application Mode. It is switched to the Programming

Mode by a pulse on the sensor output pin.

6.1. Programming Interface

In Programming Mode the sensor is addressed by

modulating a serial telegram on the sensors output

pin. The sensor answers with a modulation of the out-

put voltage.

A logical “0” is coded as no level change within the bit

time. A logical “1” is coded as a level change of typi-

cally 50% of the bit time. After each bit, a level change

occurs (see Fig. 6–1).

The serial telegram is used to transmit the EEPROM

content, error codes and digital values of the angle

information from and to the sensor.

Fig. 6–1: Definition of logical 0 and 1 bit

A description of the communication protocol and the

programming of the sensor is available in a separate

document

(Application:

HAR 2425

Programming

Guide).

logical 0

tbittime

logical 1

tbittime

50%

Table 6–1: Telegram parameters (All voltages are referenced to GND1=GND2=GNDePad = 0 V)

Symbol

Parameter

Limit Values

Unit Test Conditions

Min.

Typ.

Max.

VOUTL

Voltage for Output Low Level

during Programming through

Sensor Output Pin

OUTx



0.2*VSUP

Vfor VSUP = 5 V

VOUTH

Voltage for Output High Level

during Programming through

Sensor Output Pin

OUTx

0.8*VSUP



VSUP

5.0

Vfor VSUP = 5 V

VSUPProgram VSUP Voltage for EEPROM

programming (after PROG

and ERASE)

VSUPx

5.7

6.0

6.5

Supply voltage for

bidirectional com-

munication via out-

put pin.

tbittime

Biphase Bit Time

OUTx

900

1000

1100

µs

Slew rate

OUTx



V/µs

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