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PDF KMA200 Data sheet ( Hoja de datos )
| Número de pieza | KMA200 | |
| Descripción | Programmable angle sensor | |
| Fabricantes | NXP Semiconductors | |
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KMA200
Programmable angle sensor
Rev. 8 — 7 December 2011
Product data sheet
1. Product profile
1.1 General description
The KMA200 is an angle sensor system. The MagnetoResistive (MR) element and the
mixed signal Integrated Circuit (IC) are integrated in one package. This angle system is
already pre-programmed, offsets are compensated and therefore, ready to use.
Via the Serial Peripheral Interface (SPI) the KMA200 is user programmable. This allows
user specific adjustments of the maximum angle, zero point, clamping level and a 32-bit
identifier. The data is stored permanently in an Electrically Erasable Programmable
Read-Only Memory (EEPROM).
The device can be programmed to work either in analog or digital (SPI) output mode.
Furthermore, different analog output characteristics are possible. The resolution is better
than 0.05.
The implemented online diagnosis supervises the input and output signals as well as the
data processing. Deviations and failures of the angle value are indicated in the output
signal. Overall temperature supervision is implemented.
1.2 Features and benefits
Magnetic field angular sensing
High accuracy
Operating temperature range from
40 C to +160 C
Online diagnosis
Bidirectional digital interface (SPI)
Programmable maximum angle up
to 180
Pre-calibrated, ready to use device
One package angle sensor system
Resolution better than 0.05
Digital or analog output signals (user
programmable)
Overvoltage protection at all external
pins
EEPROM (user programmable)
Programmable zero point
1 page  
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.
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
[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.
KMA200
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
5 of 33
5 Page 
NXP Semiconductors
KMA200
Programmable angle sensor
8. Digital output (SPI)
Standard digital output
If the standard digital output mode is configured, output data can be read with the serial
interface. Figure 7 shows the timing diagram of an interface access. The access is
enclosed by a HIGH-to-LOW and LOW-to-HIGH transition of CS.
DATA are clocked out at the falling edge of CLK and should be evaluated at the rising
edge. The output data consist of 3 bytes (24 bits). The first two data bytes contain an error
flag and 13 bits of angle information. The last data byte contains the measured
temperature as 7-bit value. Every byte features a parity bit (odd parity).
The data transmission can be interrupted at any time by deactivating CS. If, for instance,
the temperature information is not desired, the data transfer can be finished by
deactivating CS after reading the first two data bytes.
If the error flag is 0, the 13 angle data bits contain the most significant bits of the
calculated angle. If the error flag is 1, an error condition was detected. The two least
significant angle data bits (A[1:0]) are replaced by an error code. All other angle data bits
(A[12:2]) still show the current measurement value. Depending on the special error case,
the measurement values are reliable or not. Error codes are described in Table 8.
The output driver of the DATA pin is slew-rate limited. The rise and fall times of the DATA
output can be programmed with the SL bit (ctrl EEPROM constant); see Table 12.
Complementary digital output
In complementary digital output mode the data transmitted is identical to the output data in
standard digital output mode except that the angle and temperature information data bits
are logically inverted. The error flag and the error code in bits A[1:0] when the error flag is
set are coded as in case of standard digital output. The parity bits also use odd parity as
standard digital output mode.
angle (MSBs)
CS
angle (LSBs)
temperature
CLK
KMA200
Product data sheet
DATA
P2 EF A12 A11
A7 P1 A6 A5
A0 P0 T6 T5
T0
P2, P1, P0
EF
A12 to A0
T6 to T0
DATA HIGH-Z (HIGH by internal weak pullup)
Parity bits (odd parity)
Error flag
13-bit angle data
7-bit temperature data
Fig 7. Digital output coding
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 7 December 2011
006aaa302
© NXP B.V. 2011. All rights reserved.
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