HAL855
DATA SHEET
Mode
Output Format
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.
The HAL855 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 24).
Range
Table 2–3: OUTPUT FORMAT register definition
Table 2–1: RANGE register definition
Output Format
PWM
Bit Setting
Magnetic Field Range
−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
Bit Setting
2
0
4
5
1
6
2
7
3
Biphase-M
41)
52)
Biphase-M (test)
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.
writing OUTPUT FORMAT = 5 will activate the
Biphase-M output for test purpose. The test can
be deactivated by switching the device off.
2)
Output Period
Filter
Table 2–2: FILTER register definition
The OUTPUT PERIOD register defines the PWM
period of the output signal.
Table 2–4: OUTPUT PERIOD register definition
−3 dB Frequency
80 Hz
Bit Setting
0
1
2
3
4
PWM Output Period
128 ms; 12-bit resolution
64 ms; 12-bit resolution
32 ms; 12-bit resolution
16 ms; 12-bit resolution
8 ms; 12-bit resolution
4 ms; 11-bit resolution
2 ms; 10-bit resolution
1 ms; 9-bit resolution
Bit Setting
160 Hz
0
1
2
3
4
5
6
7
500 Hz
1 kHz
2 kHz
10
Nov. 26, 2008; DSH000149_003EN
Micronas
MICRONAS [ MICRONAS ]
