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PDF KMA220 Data sheet ( Hoja de datos )

Número de pieza KMA220
Descripción Dual channel programmable angle sensor
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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KMA220
Dual channel programmable angle sensor
Rev. 1 — 24 May 2012
Product data sheet
1. Product profile
1.1 General description
The KMA220 is a dual channel magnetic angle sensor module. The MagnetoResistive
(MR) sensor bridges, the mixed signal Integrated Circuits (ICs) and the required
capacitors are integrated into a single package. Both integrated channels are working full
independently. The supply voltage has common terminals. Further explanations are
referring to a single channel of the KMA220.
This angular measurement module KMA220 is pre-programmed, pre-calibrated and
therefore, ready to use.
The KMA220 allows user-specific adjustments of angular range, zero angle and clamping
voltages for each channel separately. The settings are stored permanently in a
non-volatile memory.
1.2 Features and benefits
High precision sensor for magnetic
High temperature range up to 160 C
angular measurement
Single package dual channel sensor Dual electric independent sensor
module with integrated filters for
channels with analog ratiometric output
improved ElectroMagnetic Compatibility voltages
(EMC)
Automotive qualified in accordance with Overvoltage protection up to 16 V
AEC-Q100 Rev-G
Programmable user adjustments,
Independent programming via
including zero angle and angular range separated One-Wire Interfaces (OWI)
Fail-safe non-volatile memory with write Each channel includes
protection using lock bit
user-programmable 32-bit identifier
Independent from magnetic field
Magnet-loss and power-loss detection
strength above 35 kA/m
Ready to use without external
Factory calibrated
components
One common supply line

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KMA220 pdf
NXP Semiconductors
KMA220
Dual channel programmable angle sensor
α
Hext
1 2 3 4 008aaa276
Fig 2. Angular measurement directions
Since the Anisotropic MR (AMR) effect is periodic over 180, the sensor output is also
180-periodic. The angle is calculated relative to a freely programmable zero angle. The
dashed line indicates the mechanical zero degree position.
6. Analog output
The KMA220 provides two analog output signals on pin OUT1/DATA1 and on
pin OUT2/DATA2. The measured angle is converted linearly into a value, which is
ratiometric to the supply voltage VDD. Either a positive or a negative slope can be
programmed independently for each pin by the customer for this purpose.
Table 3 describes the analog output behavior for a positive slope. If for example,
a magnetic field angle, above the programmed maximum angle max, but below the clamp
switch angle sw(CL) is applied to the sensor, then analog output is set to the upper
clamping voltage. If the magnetic field angle is larger than the clamp switch angle, the
analog output switches from upper to lower clamping voltage. If there is a negative slope,
the clamping voltages are changed.
Table 3. Analog output behavior for a positive slope
Magnetic field angle
Analog output
max < < sw(CL)
V(CL)u
sw(CL) < < ref + 180
V(CL)l
The analog output voltage range encodes both angular and diagnostic information. A valid
angle value is between the upper and lower clamping voltage. If the analog output is in the
diagnostic range, that is below 4 %VDD or above 96 %VDD, an error condition has been
detected. The analog output repeats every 180.
KMA220
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 24 May 2012
© NXP B.V. 2012. All rights reserved.
5 of 36

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KMA220 arduino
NXP Semiconductors
KMA220
Dual channel programmable angle sensor
Table 13. Module performance …continued
Characteristics are valid for the operating conditions, as specified in Section 9.
Symbol Parameter
Conditions
Min
ang
angular error
temperature range
40 C to +160 C
[4][7][8] 1.35
[11]
temperature range
40 C to +140 C
[4][7][8] 1.1
[11]
mang
slope of angular error
[4][7] -
[11]
ZO(pl)
power-loss output
impedance
impedance to remaining
supply line in case of lost
supply voltage or lost ground
-
Typ
-
-
-
-
[1] At a nominal output voltage between 5 %VDD and 95 %VDD and a maximum angle of max = 180.
[2] In steps of resolution < 0.022.
[3] Activation is dependent on the programmed diagnostic mode.
[4] At a low-pass filtered analog output with a cut-off frequency of 0.7 kHz.
[5] Settling to these values is limited by 0.7 kHz low-pass filtering of analog output.
[6] In steps of 0.02 %VDD.
[7] Definition of errors is given in Section 12.
[8] Inhomogeneity of a 15 mm diameter disc magnet can increase the linearity error by < 0.1.
[9] Based on a 3standard deviation.
[10] Room temperature is given for an ambient temperature of 25 C.
[11] Graph of angular error is shown in Figure 5.
Max
+1.35
+1.1
0.04
210
Unit
deg
deg
deg/deg
KMA220
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 24 May 2012
© NXP B.V. 2012. All rights reserved.
11 of 36

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