KMA200

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© NXP B.V. 2011. All rights reserved.

Product data sheet

Rev. 8 — 7 December 2011

5 of 33

NXP Semiconductors

KMA200

Programmable angle sensor

6.

Diagnostic features

The KMA200 includes diagnostic features to ensure the validity of its output signals. The

diagnostic features can be configured with the control information words (ctrl) written to

the user-programmable EEPROM.

In the analog output modes a diagnostic error condition is signaled to the user by setting

the outputs into the high-impedance state. The outputs are forced to lie in the upper or

lower diagnostic range by external pull-up or pull-down resistors.

With no external pull-up/pull-down resistors the output signal will be internally pulled up to

upper diagnosis range.

If digital output is selected, an error condition can also be signaled by setting the error flag

in the digital output word. The least significant bits show the error code. The Table 4

shows the behavior in detail:

Once a diagnostic error condition is reached, the KMA200 continues to work normally

after a new external power-on reset or by itself, as described in the table below. It is

possible to configure the KMA200 the way that the error condition has to be fulfilled more

than once. The number of error conditions that is necessary can also be programmed with

bits in the control information words.

[1]

Reactivation for angular measurement with valid angle information (normal operation mode) only by new

external power-on reset

Temperature supervision

The chip temperature measured within the KMA200 can be used to detect

over-temperature conditions. Two temperature levels are defined: the temperature

warning level and the temperature shutdown level.

The user can evaluate the temperature warning if digital output mode is selected. When

the device temperature exceeds the warning level, the error flag in the digital output word

is set. The other data bits still show the angle information. In the analog output modes, the

device temperature warning is not available. If the temperature exceeds the

over-temperature shutdown level, the KMA200 switches off.

Table 4.

Summary KMA200 behavior at diagnosis conditions in normal operation mode

Error appearance

Analog output

Digital output

Oscillator fail detection

[1] high-impedance state

[1] high-impedance state

Cyclic Redundancy Check (CRC)

[1] high-impedance state

[1] diagnosis bit set

Watchdog

[1] high-impedance state

[1] high-impedance state

Input stage (including magnet lost)

high-impedance state

diagnosis bit set

Output stage

[1] high-impedance state

-

Over-temperature warning

-

diagnosis bit set

Over-temperature shutdown

[1] high-impedance state

[1] high-impedance state

Overvoltage

high-impedance state

high-impedance state

Reverse polarity

high-impedance state

high-impedance state