KMA200 T/R NXP Semiconductors, KMA200 T/R Datasheet - Page 4

• Manufacturer Part Number: KMA200 T/R
• Description: Power & Control Sensor ICs SNSR MAGNETIC TAPE-7
• Manufacturer: NXP Semiconductors

Specifications of KMA200 T/R

• Package / Case: SOT-637
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current: 12 mA
• Maximum Operating Temperature: + 160 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Product: Programmable Angle Sensor
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: KMA200,115

NXP Semiconductors
5. Functional description
KMA200_7
Product data sheet
The KMA200 amplifies two orthogonal sinusoidal signals delivered by the MR-sensor
element and converts them into the digital domain. Using the COordinate Rotation DIgital
Computer (CORDIC) algorithm, the angle is calculated. Angle output is either analog or
digital. The KMA200 comprises diagnostic features that ensure a complete online
supervision of all essential functional blocks including verification of input and output
signals and temperature supervision. In addition, the circuit is protected against reverse
polarity, overvoltage and short circuit at all external pins.
Two instrumentation amplifiers and
high-speed digital bit streams. The bit streams are filtered and decimated by two digital
decimation filters to obtain digital signals with higher resolution at a lower speed.
Further processing is done within an on-chip calibration microcontroller. This includes
offset cancellation, calculation of the mechanical angle using the CORDIC algorithm,
zero-angle and angular-range adjustment.
In addition, the calibration microcontroller performs diagnostic tasks to ensure the validity
of its results. The calibration microcontroller takes calibration constants from an on-chip
EEPROM and stores intermediate results in a Random Access Memory (RAM). The
calculated angle is given out either digitally with an SPI-compatible serial interface or
analog via the analog output stage. Several output characteristics can be selected.
In case of analog output the analog output stage is used for conversion of the angle
information into two analog output voltages ratiometric to the supply voltages. For this
purpose, the analog output stage contains two resistor-string Digital-to-Analog Converters
(DACs) which share the same resistor string. The two analog output voltages are buffered
by two offset-compensated amplifiers.
The internal circuitry is protected against overvoltage with special protection circuits.
Protection against reverse polarity is realized with the help of a current limiting circuit.
In addition, there are various support circuits like bias generators, a free-running oscillator
including an oscillator fail-safe circuit and a power-on reset circuit which generates a reset
in dependence of the supply voltage.
Rev. 07 — 18 July 2008
-modulators convert the amplified signals into two
Programmable angle sensor
© NXP B.V. 2008. All rights reserved.
KMA200
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