KMA199E datasheet(6/31 Pages) NXP

6 / 31 page

KMA199E_1

Product data sheet

Rev. 01 — 18 October 2007

6 of 31

NXP Semiconductors

KMA199E

Programmable angle sensor

6.3 Power-lost detection

The power-lost detection circuits enable the detection of an interrupted supply or ground

line of the KMA199E. In case of a power-lost condition, two internal switches within the

sensor are closed, connecting the pin of the analog output with the pins of the supply

voltage and the ground.

Table 3 shows the resulting output voltage depending on the error case and the load

resistance.

6.4 Low supply voltage detection

If the supply voltage is below the switch-off threshold voltage, a status bit is set.

Following table describes the behavior of the analog output at different supply voltages.

Fig 3.

Equivalent output circuit in case of a power-lost condition

Table 3.

Power-lost behavior

Load resistance

Supply voltage lost

Ground lost

RL >5kΩ

VO ≤ 4%VDD

VO ≥ 96 %VDD

001aag810

ZO(pl)

OUT/DIGINT

GND

VDD

KMA199E

Table 4.

Supply voltage behavior

Voltage range

Description

Analog output

0Vto

≈ 1.5 V

the output drives an active LOW, but the

switches of the power-lost detection circuits

are not fully opened and set the output to a

level between ground and half the supply

voltage

actively driven output to a

voltage level between ground

and half the supply voltage

≈ 1.5 V to V

POR

all modules begin to work and the power-on

reset is active

diagnostics at LOW level

VPOR to Vth(on) or

Vth(off)

all modules begin to work and the digital part

is initialized

EEPROM deﬁned diagnostic

level

Vth(on) or Vth(off) to

4.5 V

analog output is switched on after power-on

time and represents the measured angle

analog output of the

measured angle without the

speciﬁed accuracy

4.5 V to 5.5 V

normal operation where the sensor works with

the speciﬁed accuracy

analog output of the

measured angle

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