KMA310 datasheet(38/71 Pages) NXP

38 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

38 / 71

15.5 Temperature drift error

The temperature drift Δϕtemp is defined as the envelope over the deviation of the angle

versus the temperature range. It is considered as the pure thermal effect.

001aag816

180

α (deg)

meas

(deg)

temp

Figure 19. Definition of the temperature drift error

Equation (2) gives the mathematical description for temperature drift value Δϕtemp:

(2)

With:

Tx: temperature for maximum ϕmeas at angle α

Ty: temperature for minimum ϕmeas at angle α

The deviation from the value at room temperature Δϕtemp|RT describes the temperature

drift of the angle, compared to the value, which the sensor provides at room temperature:

(3)

With:

TRT: room temperature (25 °C)

15.6 Angular error

The angular error Δϕang is the difference between mechanical angle and sensor

output during a movement from α0 to α1. Here α0 and α1 are arbitrary angles within the

angular range. The customer initially programs the angle measurement at α0 at room

temperature and zero hour upon production. The angle measurement at α1 is made at

any temperature within the ambient temperature range:

(4)

With:

α0, α1: arbitrary mechanical angles within the angular range

ϕmeas(α0, TRT): programmed angle at α0, TRT = 25 °C and zero hour upon production

ϕmeas(α1, Tamb): the sensor measures angle at α1 and any temperature within Tamb

This error comprises non-linearity and temperature drift related to the room temperature.

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