KMA310 datasheet(23/71 Pages) NXP

23 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

23 / 71

10.5.1 Timing description

BIST completion check

ASIL control sequence

aaa-028146

IDLE

6.25 kHz clock

RESET_N

SM-08

BIST encoding check

SM-01

magnetic field conversion check

SM-02

inverted angle calculation check

SM-05

adjusted angle calculation check

SM-04

data conversion check

SM-03

data division check

SM-07

Figure 13. Sequence state register and start flags for integrated self-checks

10.5.2 User selectable BIST

To enable the BISTs SM-01 to SM-06 set the BIST bit in ASIL_SETTING register;

see Table 51. User selectable self-tests can be enabled or masked separately as

described in the following subsections.

10.5.2.1 Magnetic field conversion check (SM-01)

The output amplitude of an AMR sensor has a strong temperature dependency. This

physical effect is used to check the plausibility of the AMR signals. The magnetic

field conversion check compares a temperature value, which is based on an on-chip

temperature sensor with the temperature information based on the AMR amplitude. In

case the magnet is removed, the AMR amplitude goes down, and the magnetic field

conversion check indicates this failure mode. Furthermore, this check can be switched off

separately with the magnetic field conversion check bit of the ASIL_SETTING register;

see Table 51.

In case the on-chip temperature sensor fails, the product goes to diagnostic condition,

even if the angle data path is not directly affected from this failure mode.

10.5.2.2 Inverted angle calculation check (SM-02)

The inverted angle calculation check calculates a second internal output angle value.

Based on the customer settings the second angle value is an exact inverted copy of the

main data path angle. The check compares the sum of both calculated angle values with

the sum of both adjusted customer clamping levels. In case the post-CORDIC integrated

adder and multiplier are in normal operating mode the result is equal. Furthermore, this

check can be switched off separately with the inverted angle calculation check bit of the

ASIL_SETTING register; see Table 51.

In case internal post-memory addressing, post-multiplier or post-adder fails, the product

goes into diagnostic mode.

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