KMA220 datasheet(5/36 Pages) NXP

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KMA220

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Product data sheet

Rev. 1 — 24 May 2012

5 of 36

NXP Semiconductors

KMA220

Dual channel programmable angle sensor

Since the Anisotropic MR (AMR) effect is periodic over 180

, the sensor output is also

180

-periodic. The angle is calculated relative to a freely programmable zero angle. The

dashed line indicates the mechanical zero degree position.

Analog output

The KMA220 provides two analog output signals on pin OUT1/DATA1 and on

pin OUT2/DATA2. The measured angle

 is converted linearly into a value, which is

ratiometric to the supply voltage VDD. Either a positive or a negative slope can be

programmed independently for each pin by the customer for this purpose.

Table 3 describes the analog output behavior for a positive slope. If for example,

a magnetic field angle, above the programmed maximum angle



max, but below the clamp

switch angle



sw(CL) is applied to the sensor, then analog output is set to the upper

clamping voltage. If the magnetic field angle is larger than the clamp switch angle, the

analog output switches from upper to lower clamping voltage. If there is a negative slope,

the clamping voltages are changed.

The analog output voltage range encodes both angular and diagnostic information. A valid

angle value is between the upper and lower clamping voltage. If the analog output is in the

diagnostic range, that is below 4 %VDD or above 96 %VDD, an error condition has been

detected. The analog output repeats every 180

.

Fig 2.

Angular measurement directions

008aaa276

Hext

Table 3.

Analog output behavior for a positive slope

Magnetic field angle

Analog output



max <  < sw(CL)

V(CL)u



sw(CL) <  < ref + 180

V(CL)l

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