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Número de pieza | KMA199E | |
Descripción | Programmable angle sensor | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
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KMA199E
Programmable angle sensor
Rev. 01 — 18 October 2007
Product data sheet
1. Product profile
1.1 General description
The KMA199E is a magnetic angle sensor system. The MagnetoResistive (MR) sensor
bridges and the mixed signal Integrated Circuit (IC) are integrated into a single package.
This angular measurement system KMA199E is pre-programmed, pre-calibrated and
therefore, ready to use.
The KMA199E allows user specific adjustments of angular range, zero angle and
clamping voltages. The settings are stored permanently in an Electrically Erasable
Programmable Read-Only Memory (EEPROM).
1.2 Features
I High precision sensor for magnetic
angular measurement
I Programmable user adjustments,
including zero angle and angular range
I Single package sensor system
I Magnet-lost and power-lost detection
I Built-in transient protection
I User-programmable 32-bit identifier
I Ready to use
I Ratiometric output voltage
I Independent from the magnetic field
strength above 35 kA/m
I Programming via One-Wire Interface
(OWI)
I Fail-safe EEPROM
I High temperature range
I Factory calibrated
1 page NXP Semiconductors
www.DataSheet4U.com
KMA199E
Programmable angle sensor
α
Hext
001aag741
Fig 2. Angular measurement directions
Since the Anisotropic MR (AMR) effect is periodic over 180°, the sensor output is also
180°-periodic, whereas the angle is calculated relative to a freely programmable zero
angle. The dashed line indicates the mechanical zero degree position.
6. Diagnostic features
The KMA199E provides four diagnostic features:
6.1 EEPROM CRC and EDC supervision
The KMA199E includes a supervision of the programmed data. At power-on, a CRC of the
EEPROM is done. Furthermore the EEPROM is protected against bit errors. For this
purpose every 16-bit data word is saved internally as a 22-bit word. The protection logic
corrects any single-bit error in a data word, while the sensor continues in normal operation
mode and can detect all double-bit errors by going into diagnostic mode.
6.2 Magnet-lost detection
If the applied magnetic field strength is not sufficient, the KMA199E raises a diagnostic
condition. In order to enter the diagnostic mode, due to EEPROM CRC or magnet-lost
detection, the device can be programmed for an active diagnostic mode, where the output
is driven below 4 %VDD or above 96 %VDD.
KMA199E_1
Product data sheet
Rev. 01 — 18 October 2007
© NXP B.V. 2007. All rights reserved.
5 of 31
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KMA199E
Programmable angle sensor
Table 13. Digital interface …continued
Characteristics are valid for the operating conditions, as specified in Section 9.
Symbol Parameter
Conditions
∆Tbit
bit period deviation
deviation between received
clock and sent clock
ttko(slv)
slave takeover time
duration of LOW level for slave
takeover
ttko(mas)
master takeover time
duration of LOW level for
master takeover
tprog programming time
tcp charge pump time
for a single EEPROM address
waiting time after enabling the
EEPROM charge pump clock
12. Definition of errors
Min
0.8Tbit
1
0Tbit
20
1
Typ
1Tbit
-
-
-
-
Max
1.2Tbit
5
0.5Tbit
-
-
Unit
s
µs
s
ms
ms
12.1 General
Angular measurement errors by the KMA199E result from linearity errors, temperature
drift errors and hysteresis errors. Figure 5 shows the output signal of an ideal sensor,
where the measured angle φmeas corresponds ideally to the magnetic field angle α. This
curve will further be denoted as angle reference line φref(α) with a slope of 0.5 %VDD/deg.
φmeas
(deg)
φref(α)
180 α (deg)
001aag812
Fig 5. Definition of the reference line
For valid definition of errors, the angular range is set to αmax = 180° and the clamping
voltages are programmed to V(CL)l = 5 %VDD and V(CL)u = 95 %VDD.
12.2 Hysteresis error
The hysteresis error ∆φhys is defined as the maximum difference between angles, given by
the device output when performing a positive (clockwise) rotation and negative (counter
clockwise) rotation over an angular range of 180°, measured at a constant temperature.
KMA199E_1
Product data sheet
Rev. 01 — 18 October 2007
© NXP B.V. 2007. All rights reserved.
11 of 31
11 Page |
Páginas | Total 31 Páginas | |
PDF Descargar | [ Datasheet KMA199E.PDF ] |
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