AK7451 Datasheet, PDF (12/32 Pages) Asahi Kasei Microsystems – zero latency angle sensor ic

[AK7451]
13. Mode Transition Diagram and Conditions
This IC has the following two modes and starts with “Normal Mode” at start up.
In the “Normal Mode”, this sensor will be operated as angle output mode. User can read the angle data
via SPI pin and ABZ pin and also can transfer to “User Mode” by using specific OPCODE. And also in
this mode, UVW output is available to detect the magnet rotor position in BCDL motor driving.
In the “User Mode”, the user can set the various operation conditions via SPI communication. The
settable item will be described later in this section.
Mode name
Note
Normal Mode In this mode, The absolute angle data including error bit, parity bit and mode
information will be outputted via SPI communication by inputting specific OPCODE.
And the ABZ and UVW pulses are outputted automatically along with magnet
rotating.
User Mode Do not use the angle data (ABZ and UVW pulses) in this mode.
The following functions are available in this mode.
a. Magnetic flux density measurement
b. Abnormal state checking
c. Memory lock
d. Angle zero position setting
e. ABZ output enable/disable and resolution, hysteresis setting
f. Abnormal detection enable/disable setting
g. Rotation direction setting
h. UVW output enable/disable and the number of output pulses, hysteresis setting
Note 5. In user mode, output on ERROR PIN is low state (abnormal status). And the accuracy of
magnetic flux density measurement is not guaranteed.
Each mode can be changed by writing specific OPCODE and specific data on specific address as the
diagram below.
Normal Mode
Addr.0x02
OPCODE：
0101
DATA：0x50F
User Mode
Addr.0x02
OPCODE：0101
DATA：0
or
Re Power-On
Figure 5. Mode transition diagram
016006637-E-00
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2016/05