KMA199 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 7 December 2011 12 of 36
NXP Semiconductors
KMA199
Programmable angle sensor
12. Definition of errors
12.1 General
Angular measurement errors by the KMA199 result from linearity errors, temperature drift
errors and hysteresis errors. Figure 6
shows the output signal of an ideal sensor, where
the measured angle
meas
corresponds ideally to the magnetic field angle . This curve
will further be denoted as angle reference line
ref
() with a slope of 0.5 %V
DD
/deg.
The angular range is set to
max
=180 and the clamping voltages are programmed to
V
(CL)l
=5%V
DD
and V
(CL)u
=95%V
DD
for a valid definition of errors.
t
stop
stop time HIGH level before falling edge 5 - - s
T
bit
bit period minimum period may be
limited by the load
capacitance
10 - 100 s
T
bit
bit period deviation deviation between received
clock and sent clock
0.8T
bit
1T
bit
1.2T
bit
s
t
w0
pulse width 0 0.175T
bit
0.25T
bit
0.375T
bit
s
t
w1
pulse width 1 0.625T
bit
0.75T
bit
0.825T
bit
s
t
to
time-out time digital communication reset
guaranteed after maximum t
to
--220s
t
tko(slv)
slave takeover time duration of LOW level for
slave takeover
1-5s
t
tko(mas)
master takeover time duration of LOW level for
master takeover
0T
bit
-0.5T
bit
s
t
prog
programming time for a single EEPROM address 20 - - ms
t
cp
charge pump time waiting time after enabling the
EEPROM charge pump clock
1-- ms
Table 13. Digital interface
…continued
Characteristics are valid for the operating conditions, as specified in Section 9.
Symbol Parameter Conditions Min Typ Max Unit
Fig 6. Definition of the reference line
001aag812
180
α (deg)
φ
meas
(deg)
φ
ref
(α)
