KMA310 datasheet(5/71 Pages) NXP

5 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

5 / 71

7 Analog output

KMA310 provides an analog output signal on pin OUT/DATA (if bit 12 in register

SYS_SETTING is set to logic 0; see Table 51). The measured angle α is converted

linearly into a value, which is ratiometric to the supply voltage VDD. Either a positive or a

negative slope is provided for this purpose.

Table 3 describes the analog output behavior for a positive slope. A magnetic field angle,

above the programmed maximum angle αmax, but below the clamp switch angle αsw(CL)

sets the analog output 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.

Table 3. Analog output behavior for a positive slope

Magnetic field angle

Analog output

αmax < α < αsw(CL)

V(CL)u

αsw(CL) < α < αref + 180°

V(CL)l

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°.

aaa-028525

αrng

0 αref

αmax

αsw(CL)

αref + 180°

α (deg)

180

VO/VDD

(%)

V(CL)u

V(CL)I

αmax = αref + αrng

Figure 3. Characteristic of the analog output

8 Digital output

KMA310 provides a digital output signal on pin OUT/DATA (if bit 12 in register

SYS_SETTING is set to logic 1; see Table 51) compliant with the SAE J2716 SENT

standard. The measured angle α is converted linearly into a value, which is digital

encoded in SENT frames. Either a positive or a negative angular slope characteristic is

provided for this purpose.

Table 4 describes the digital output behavior for a positive slope. A magnetic field angle

above the programmed maximum angle αmax but below the clamp switch angle αsw(CL)

sets the output to the upper clamping value. If the magnetic field angle is larger than

the clamp switch angle, the output value switches from upper to lower clamping value.

If there is a negative slope, the clamping levels are changed.

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