MA800 – 8-BIT, DIGITAL ANGLE SENSOR

MA800 Rev. 1.02

www.MonolithicPower.com

19

6/15/2018

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Figure 20: Magnetic Field Produced by a

5mmx3mm N35 Magnet as a Function of the

Airgap with Threshold Set to 110mT

In this way, it is possible to implement a push or

pull action.

MagHys, the hysteresis on the signals MGH

and

MGL,

is

indicated

in

the

General

Characterisitcs table on page 5. The MGLT and

MGHT thresholds are coded on three bits and

stored in register 6 (see Table 13).

Table 13: Register 6

Reg Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

6

MGLT

MGHT

-

-

The

3-bit

values

of

MGLT

and

MGHT

correspond to the magnetic field (see Table 14).

Table 14: MGLT and MGHT Binary to mT Relation

MGLT or

MGHT

(8)

Field threshold in mT

(7)

From low to high

magnetic field

From high to low

magnetic field

000

26

20

001

41

35

010

56

50

011

70

64

100

84

78

101

98

92

110

112

106

111

126

120

NOTES:

7)

Valid for VDD = 3.3V. If different, then the field threshold is

scaled by the factor VDD/3.3V.

8)

MGLT can have a larger value than MGHT.

The alarm flags (MGL and MGH) can be read in

register 27 (bit 6 and bit 7), and their logic state

is also given at the digital output pins 11 and 16.

To read the MGL and MGH flags by SPI, send

the 8-bit command write to register 27:

command

reg. address

MSB

value

LSB

0

1

0

1 1 0 1 1

0 0 0 0 0 0 0 0

The MA800 answers with the register 27

content in the next transmission:

Reg Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

27

MGH MGL

x

x

x

x

x

x