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KMA220 Folha de dados(PDF) 7 Page - NXP Semiconductors

Nome de Peças KMA220
Descrição Electrónicos  Dual channel programmable angle sensor
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Fabricante Electrônico  NXP [NXP Semiconductors]
Página de início  http://www.nxp.com
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KMA220
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 24 May 2012
7 of 36
NXP Semiconductors
KMA220
Dual channel programmable angle sensor
Table 4 describes the power-loss behavior and gives the resulting output voltage
depending on the interrupted supply or ground line and the load resistance.
7.4 Low supply voltage detection and overvoltage protection
If the supply voltage is below the switch-off threshold voltage, a status bit is set in each
signal conditioning integrated circuit and both channels go into diagnostic mode. If the
supply voltage is above the overvoltage switch-on threshold voltage, both channel enter
diagnostic mode. Table 5 describes the system behavior depending on the voltage range
of the supply voltage.
Fig 4.
Equivalent output circuit in a power-loss condition
Table 4.
Power-loss behavior
Load resistance
Interrupted supply line
Interrupted ground line
RL(ext) >5k
VO  4%VDD
VO  96 %VDD
008aaa277
ZO(pl)
ZO(pl)
OUTn/DATAn
GND
VDD
OUTPUT
Table 5.
System behavior for each output
Supply voltage
State
Description
0V to
 1.8 V
start-up power The output buffer drives an active LOW or is powered down,
but the switches of the power-loss detection circuit are not
fully opened and set the output to a level between ground and
half the supply voltage.
 1.8 V to V
POR
power-on
reset
The power-loss charge pump is fully operational and turns the
switches of the detection circuit off. The output buffer drives
an active LOW and sets the output to the lower diagnostic
level. During the reset phase, all circuits are in reset and/or
Power-down mode.
VPOR to Vth(on) or
Vth(off)
initialization
The digital core and the oscillator are active. After reset, the
content of the non-volatile memory is copied into the shadow
registers. The output buffer drives an active LOW and sets the
output to the lower diagnostic level.
Vth(on) or Vth(off) to
minimum VDD
functional
operation
All analog circuits are active and the measured angle is
available at the analog output. Not all parameters are within
the specified limits.
Minimum VDD to
maximum VDD
normal
operation
All analog circuits are active and the measured angle is
available at the analog output. All parameters are within the
specified limits.
Maximum VDD to
Vth(ov)
functional
operation
All analog circuits are active and the measured angle is
available at the analog output. Not all parameters are within
the specified limits.
Vth(ov) to 16 V
overvoltage
Both digital cores and oscillators are active but all other
circuits are in Power-down mode. The outputs are set to the
lower diagnostic level.


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