Datasheet

KMZ60 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet Rev. 2 — 7 February 2014 20 of 30
NXP Semiconductors
KMZ60
Angle sensor with integrated amplifier
In front of the ADC inputs bandwidth limitation filters should be implemented related to the
used sampling frequency of the system to reduce the noise bandwidth (see Figure 15
).
The load resistors R
L(o)ext
are representing the input load of the filter application and the
ADC.
The ECU may be used for arctan and offset calculation, offset storage and calibration.
13.2 EMI
A blocking capacitor C
block(ext)
and the load capacitors C
L(o)ext
for the signal outputs are
necessary to fulfill the EMI requirements. They should be soldered close to the related IC
pins.
To protect the output stages VOUT1 and VOUT2 an internal resistance is implemented.
It works like a voltage divider together with the load resistance R
L(o)ext
.
Capacitor C
L(o)ext
is required on pin VTEMP for output stability. The pin can be soldered
directly to ground or preferably to V
CC
on the PCB if it is not used.
Capacitor C
L(i)ext
is required on pin POWERDOWN_EN to fulfill the EMI demands.
The pin may be soldered directly to ground on the PCB if it is not used.
13.3 Power consumption
The power consumption is dependent on V
CC
, temperature, load resistance R
L(o)ext
,
load capacitance C
L(o)ext
and frequency of the rotating magnetic field. It is recommended
to refer the load resistance R
L(o)ext
and the load capacitance C
L(o)ext
to ground although a
connection to V
CC
is likewise possible. V
O(TEMP)
is related to ground via the external load
resistance R
L(o)ext
on pin VTEMP.
The output voltages V
o(VOUT1)
, V
o(VOUT2)
and V
O(TEMP)
are protected against short-circuit
to V
CC
or ground by current limitation within the given time duration.
Placing the device 180 degrees rotated into the socket may lead to damages, if the supply
current is not limited to 100 mA.
13.4 TC compensation
KMZ60 can be used as specified with TC compensation of the MR sensor signal.
Pin TCC_EN has to be connected to V
CC
.
The pin TCC_EN has to be connected to ground if no TC compensation is required.
The output signal amplitude will decrease with increasing temperature related to the TC of
the MR sensor. The angle accuracy might be slightly reduced due to the limited resolution
of the used ADC.
13.5 Offset of signal outputs on pin VOUT1 and pin VOUT2
The single-ended output signals are referenced to V
CC
/ 2 generated internally on chip.
Offsets are originated from matching inaccuracies of the production process. For a good
accuracy matching of the external load is additionally required.
For ESD and EMC protection the outputs are containing a series resistance.
The influence of this series resistance is minimized with a large output load resistance.