KMA199E T/R NXP Semiconductors, KMA199E T/R Datasheet - Page 5

• Manufacturer Part Number: KMA199E T/R
• Manufacturer: NXP Semiconductors

Specifications of KMA199E T/R

• Operating Temperature (min): -40C
• Operating Supply Voltage (typ): 5V
• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
6. Diagnostic features
KMA199E_1
Product data sheet
6.1 EEPROM CRC and EDC supervision
6.2 Magnet-lost detection
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.
The KMA199E provides four diagnostic features:
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.
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 %V
Fig 2. Angular measurement directions
DD
Rev. 01 — 18 October 2007
or above 96 %V
DD
.
001aag741
Programmable angle sensor
H
ext
KMA199E
© NXP B.V. 2007. All rights reserved.
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