HAL856 datasheet(10/42 Pages) MICRONAS

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HAL856

DATA SHEET

March 23, 2010; DSH000142_002EN

Micronas

Mode

The MODE register consists of four “sub”-registers

defining the magnetic and output behavior of the sen-

sor. The RANGE bits are the three lowest bits of the

MODE register; they define the magnetic field range of

the A/D converter. The next three bits (FILTER) define

the

−3 dB frequency of the digital low pass filter. The

next sub-register is the FORMAT register, and it

defines the different output formats as described

below. This sub-register also consists of 3 bits. The

last three MSBs define the OUTPUT PERIOD of the

PWM signal.

Range

Filter

Output Format

The HAL856 provides two different output formats: a

PWM and Biphase-M output.

PMW output is a pulse width modulated output. The

signal is defined by the ratio of pulse width to pulse

period.

The Biphase-M output is a serial protocol. A logical “0”

is coded as no output level change within the bit time.

A logical “1” is coded as an output level change

between 50% and 80% of the bit time. After each bit,

an output level change occurs (see Section 3.6.1. on

page 26).

Table 2–1: RANGE register definition

Magnetic Field Range

Bit Setting

−30 mT...30 mT

−40 mT...40 mT

−60 mT...60 mT

−75 mT...75 mT

−80 mT...80 mT

−90 mT...90 mT

−100 mT...100 mT

−150 mT...150 mT

Table 2–2: FILTER register definition

−3 dB Frequency

Bit Setting

80 Hz

160 Hz

500 Hz

1kHz

2kHz

Table 2–3: OUTPUT FORMAT register definition

Output Format

Bit Setting

PWM

Biphase-M

41)

Biphase-M (test)

52)

1) In case of OUTPUT FORMAT = 4 the continuous

Biphase-M output will be active after locking the

device. In order to test the Biphase-M output with

non-locked sensors OUTPUT FORMAT = 5 has

to be used.

2) writing OUTPUT FORMAT = 5 will activate the

Biphase-M output for test purpose. The test can

be deactivated by switching the device off. It is

not possible to communicate with the sensor after

activation of test mode.

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