CS4122XDWF24

CS4122
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7
Table 1. Nominal Output for Major Gauge (V
BB
= 14 V)
Input Code
(Decimal)
Ideal
Degrees
Nominal
Degrees
V
SIN
(V)
V
COS
(V)
0 0 0.176 0.032 10.472
128 45 45.176 10.472 10.412
256 90 90.176 10.472 −0.032
384 135 135.176 10.412 −10.472
512 180 180.176 −0.032 −10.472
640 225 225.176 −10.472 −10.412
768 270 270.176 −10.472 0.032
896 315 315.176 −10.476 10.412
1023 359.65 359.826 −0.032 10.472
Table 2. Nominal Output for Minor Gauges (V
BB
= 14 V)
Input Code
(Decimal)
Scale
Degrees
Degrees
from Center
V
COIL
0 0 −56.1 10.417
127 55.88 −0.22 0.027
128 56.32 0.22 −0.027
255 112.2 56.1 −10.417
The 12 bits are shifted into the device’s shift register MSB
first using a SPI compatible scheme. This method is shown
in Figures 6 and 7. The first 2 bits select the output driver for
which the data is intended. The CS must be high and remain
high for SCLK to be enabled. Data on SI is shifted in on the
rising edge of the synchronous clock signal. Data in the shift
register is shifted to SO on the falling edge of SCLK. This
arrangement allows the cascading of devices. SO is always
enabled. Data shifts through without affecting the outputs
until CS is brought low. At this time, the internal DAC is
updated and the outputs change accordingly.
CS
SI
SCLK
SO
SI
(Setup)
SI
(Hold)
SO
(tpd)
SO
(Rise,
Fall)
10% − 90%
CS
Hold
CS
Setup
Figure 7. Serial Data Timing Diagram
The DAC for the major gauge driver outputs 128 discrete
levels selected by bits D6 − D0. These bits are XOR’d with
D7 to invert them when choosing the 2nd half of each
quadrant (each odd octant). This reduces the number of
resistors and switches required. The MUX chooses which
signals to send to the output amplifiers based upon D9 − D7.
There are three choices for each amplifier: high, low or the
DAC output.
The DAC’s for the minor gauge drivers similarly output
128 discrete levels selected by bits D6 − D0. These bits are
also XOR’d with D7 to invert them when choosing the 2nd
half of the output range. The MUX chooses which signals to
send to the output amplifiers based upon D7. There are two
choices for each amplifier; high or the DAC output. Bits D8
and D9 are not used, but should be set to “00” to ensure that
the minor gauge outputs are enabled.
The output buffers are unity gain amplifiers. Each of the
eight outputs are designed to swing close to the supply rails
to maximize the voltage across the coils to produce
maximum torque. Additionally, this lowers the power
dissipation. The current for each output is also monitored. If
any of the major gauge outputs exceed the maximum value,
all of the major outputs are disabled. If any of the minor
gauge outputs exceed the maximum value, all of the minor
outputs are disabled. The falling edge of the CS re−enables
the outputs with the fault condition but they remain on only
if the overcurrent situation has been eliminated.
CS4122
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8
APPLICATION DIAGRAMS
V
BAT
Figure 8. Full Application
SIN−
C2+
C2−
COS−
C1−
C1+
GND
CS
SI
SO
SCLK
COS+
CS4122
SIN+
SPI
IRQ
HOST CONTROLLER
360°
112°
112°
ENA
VOLTAGE
REGULATION*
+12 V
+5.0 V
CS8156
20 k
V
IGN
V
OUT1
V
OUT2
V
IN
V
IN
FAULT
V
CC
V
BB
360°
112°
SIN−
C2+
C2−
COS−
C1−
C1+
GND
CS
SI
SO
SCLK
COS+
CS4122
SIN+
FAULT
V
CC
V
BB
Figure 9. Application with One Minor Gauge
V
BB
/2
V
BB
/2
*ON Semiconductor offers a complete line of automotive voltage regulators.
Visit http://onsemi.com and search for the Automotive Analog Products Guide, SGD516/D.
For additional information, please contact your local Sales Representative.
CS4122
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9
PACKAGE DIMENSIONS
SOIC−24 WB
DWF SUFFIX
CASE 751E−04
ISSUE E
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN
EXCESS OF D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
−A−
−B− P12X
D24X
12
1324
1
M
0.010 (0.25) B
M
S
A
M
0.010 (0.25) B
S
T
−T−
G22X
SEATING
PLANE
K
C
R X 45
_
M
F
J
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A 15.25 15.54 0.601 0.612
B 7.40 7.60 0.292 0.299
C 2.35 2.65 0.093 0.104
D 0.35 0.49 0.014 0.019
F 0.41 0.90 0.016 0.035
G 1.27 BSC 0.050 BSC
J 0.23 0.32 0.009 0.013
K 0.13 0.29 0.005 0.011
M 0 8 0 8
P 10.05 10.55 0.395 0.415
R 0.25 0.75 0.010 0.029
____
PACKAGE THERMAL DATA
Parameter SOIC−24 WB Unit
R
q
JC
Typical 9 °C/W
R
q
JA
Typical 55 °C/W
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to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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CS4122XDWF24

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers Air Core Gauge DRVR
Lifecycle:
New from this manufacturer.
Delivery:
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