2000 May 19
7
Philips Semiconductors
Preliminary specification
Sensor Conditioning Electronic
UZZ9000
Angle range setting
To select one of 16 different angular ranges, an external
voltage (see Table 1) must be applied to pin 13 of the
UZZ9000 (Var). During the ICs initialisation phase, which
directly follows power-on reset or an external reset, this
voltage is read and then converted into the digital domain.
The digital value is stored until the next reset state occurs.
Consequently, the angular range cannot be changed
during normal operation but is still fixed after initialisation
phase. Note that the voltage at pin 13 must be ratiometric
toV
DDA
andalsostableovertemperatureandlifetime.This
is ensured, for instance, when providing this voltage via a
(trimmable) resistor divider connected to V
DDA
, which is
the analog supply of the UZZ9000. The following defines
the % value of the supply voltage V
DDA
that must be
supplied to pin 13 to select a certain range. When using
the 30
°
angular range, a constant zero point offset of 15
°
is added. Consequently, when using the 30
°
range, the
zero point offset can be programmed between 10
°
and 20
°
only (see Zero point offset setting).
Table 1
Definition of voltages to set UZZ9000 angular
ranges
Zero point offset setting
To adjust the zero point offset or to set it to 0
°
, an external
voltage has to be applied to the UZZ9000 at pin 14
(VOFFIN). The function is similar to that described
previously. After reset the voltage is read, converted into
the digital domain and then stored until another reset state
occurs. Consequently, the zero point offset cannot be
adjusted without a reset. It is recommended to use a
resistordividerconnectedtoV
DDA
togeneratethisvoltage.
Table 2 defines the allowed voltage ranges as a
percentage of the supply V
DDA
.
Table 2
Definition of voltages to set a certain zero point
offset
Offset trimming
To achieve a linear output characteristic, it is necessary to
adapt the offsets of the two input signals to the input stage
of the UZZ9000. For this reason a sensor offset
cancellation procedure has been implemented in the
UZZ9000 which is started by sending a special serial data
protocol to the UZZ9000. This trimming procedure is
required for both input signals.
ANGULAR
RANGE
(
°
)
0 to 30
0 to 40
0 to 50
0 to 60
0 to 70
0 to 80
0 to 90
0 to 100
0 to 110
0 to 120
0 to 130
0 to 140
0 to 150
0 to 160
0 to 170
0 to 180
MIN.
(%)
NOM.
(%)
MAX.
(%)
UNIT
(%)
33.47
35.69
37.91
40.14
42.36
44.58
46.80
49.02
51.25
53.47
55.69
57.91
60.13
62.36
64.58
66.80
33.73
35.95
38.17
40.40
42.62
44.84
47.06
49.28
51.51
53.73
55.95
58.17
60.39
62.62
64.84
67.06
33.99
36.21
38.43
40.66
42.88
45.10
47.32
49.54
51.77
53.99
56.21
58.43
60.65
62.88
65.10
67.32
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
ZERO
POINT
OFFSET
(
°
)
5
4.
5
°
4
°
3.5
°
3
°
2.5
°
2
°
1.5
°
1
°
0.5
°
0
°
0.5
°
1
°
1.5
°
2
°
2.5
°
3
°
3.5
°
4
°
4.5
°
5
°
MIN.
(%)
NOM.
(%)
MAX.
(%)
UNIT
(%)
33.47
35.14
36.80
38.47
40.13
41.80
43.47
45.13
46.80
48.60
50.13
51.80
53.46
64.58
56.79
58.46
60.13
61.79
63.46
65.12
66.79
33.73
35.40
37.06
38.73
40.39
42.06
43.73
45.39
47.06
48.72
50.39
52.06
53.72
55.39
57.05
58.72
60.39
62.05
63.72
65.38
67.05
33.99
35.66
37.32
38.99
40.65
42.32
43.99
45.65
47.32
48.98
50.65
52.32
53.98
55.65
57.31
58.98
60.65
62.31
63.98
65.64
67.31
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA
V
DDA