uzz9000 NXP Semiconductors, uzz9000 Datasheet - Page 5

• Manufacturer Part Number: uzz9000
• Description: Sensor Conditioning Electronics
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The following list gives a short description of the relevant
block functions:
1. The ADC block contains two Sigma Delta AD
2. The decimation filter block comprises two digital low
3. The ALU block derives an angle value from the two
4. The DAC converts the output of the ALU block to an
5. The CONTROL block provides the clock and the
6. The RESET block supplies a reset signal during
7. The Oscillator generates the master clock.
2000 Nov 27
handbook, full pagewidth
Sensor Conditioning Electronic
converters, sensor offset correction circuitry and the
circuitry required for the sensitivity and offset
adjustment of the chip output voltage curve.
pass decimation filters convert the low resolution high
speed bit stream output from the ADC’s into a low
speed digital word.
digital inputs using the CORDIC algorithm.
analog signal.
control signals for the chip.
power-up and power-down when the power supply is
below a certain value.
V O1
V O1
V O2
V O2
RESET
ADC1
ADC2
reset
UZZ9000
DECIMATION
DECIMATION
Fig.1 Block diagram.
FILTER
FILTER
5
OSCILLATOR
Angle range selection
In order to accommodate varying applications, both the
mechanical input angular range of the UZZ9000 and the
zero point of the output curve are user programmable. This
section describes how to select a desired mode.
The output curve is adjusted by changing the angular
range as shown in Fig.2. Without any zero point offset, the
ramp-up starts at mechanical 0 ( 1 = 0 ). When using a
KMZ41 sensor, the maximum angular range
is 0 to 180 . For the UZZ9000, smaller angular ranges
can be set. In this case, 2 becomes smaller than 180
and the output curve is clipped at this position. The
location of discontinuity X
clipping area) depends on the adjusted range and can be
calculated as follows:
In order to compensate for tolerances, the zero point of the
output curve can be shifted by 5˚ in steps of 0.5 . The
effect of this measure is shown in Fig.3. Now 1 is no
longer identical with mechanical 0˚, but with the zero point
shift X
can be calculated as follows:
X
X
D
D
=
=
ALU
off
x
off
. Consequently, the location of discontinuity X
+
+
180 –
--------------------------
+
CONTROL
2
180 –
--------------------------
DAC
2
MHB694
D
(change from lower to upper
output
angle range
offset
DATA-CLK
SMODE
Product specification
UZZ9000
D