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AS5311
Datasheet - D e t a i l e d D e s c r i p t i o n
If CLK is low at the falling edge of CSn, the first 12 bits represent the magnitude information, which is proportional to the magnetic field strength.
This information can be used to detect the presence and proper distance of the magnetic strip by comparing it to a known good value (depends
on the magnet material and distance).
The automatic gain control (AGC) maintains a constant MAGnitude value of 3F hex (=“green” range). If the MAG value is <>3F hex, the AGC is
out of the regulating range (“yellow” or “red” range). See Table 13 for more details. For AGC algorithm only M11: M4 of the magnitude are used.
A value of zero or close to zero indicates a missing magnet.
Figure 7. Synchronous Serial Interface with Magnetic Field Strength Data
CSn
T CLK/2
t CSn
t CLK FE
CLK
1
8
18
1
DO
M11
M10
M9
M8
M7
M6
M5
M4
M3
M2
M1
M0
OCF COF
LIN
Mag
INC
Mag
DEC
Even
PAR
D11
t DO active
t DO valid
Magnetic field strength data
Status Bits
t DO Tristate
If CSn changes to logic low, Data Out (DO) will change from high impedance (tri-state) to logic high and the read-out will be initiated.
?? After a
minimum time t CLK FE , data is latched into the output shift register with the first falling edge of CLK.
?? Each subsequent rising CLK edge shifts out one bit of data.
?? The
serial word contains 18 bits, if CLK is high at the falling edge of CSn (see Figure 6) , the first 12 bits are the absolute distance informa-
tion D[11:0], the subsequent 6 bits contain system information, about the validity of data such as OCF, COF, LIN, Parity and Magnetic Field
status (increase/decrease).
?? If CLK is low at the falling edge of CSn, the first 12 bits contain
(see Figure 7) .
the magnitude information and the subsequent bits contain the status bits
?? A subsequent measurement is initiated by a “high” pulse at CSn with a
minimum duration of t CSn .
Data Contents:
D11:D0 absolute linear position data (MSB is clocked out first)
M11:M0 magnitude / magnetic field strength information (MSB is clocked out first)
OCF (Offset Compensation Finished), logic high indicates the finished Offset Compensation Algorithm. If this bit is not set, the data at D11:D0
(likewise M11:M0) may be invalid.
COF (Cordic Overflow), logic high indicates an out of range error in the CORDIC part. When this bit is set, the data at D11:D0 (likewise M11:M0)
is invalid.
This alarm may be resolved by bringing the magnet within the X-Y-Z tolerance limits.
LIN (Linearity Alarm), logic high indicates that the input field generates a critical output linearity.
When this bit is set, the data at D11:D0 may still be used, but can contain invalid data. This warning can be resolved by increasing the magnetic
field strength.
Even Parity bit for transmission error detection of bits 1…17 (D11…D0, OCF, COF, LIN, MagINC, MagDEC)
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