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PDF CS4122 Data sheet ( Hoja de datos )
| Número de pieza | CS4122 | |
| Descripción | Triple Air-Core Gauge Driver with Serial Input Bus | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CS4122 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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CS4122
Triple Air−Core Gauge
Driver with Serial Input Bus
The CS4122 converts digital data from a microprocessor to
complementary DC outputs and drives air−core meter movements for
vehicle instrument panels. It is optimized for one 360° gauge and two
112° gauges. The digital data controls the voltage applied to the
quadrature coils of the meters with a 0.35° resolution for the major
(360°) gauge and 0.44° resolution for the minor (112°) gauges. The
accuracy is ±0.75° for the major and ±1.00° for the minors. The
interface from the microcontroller is by a SPI compatible serial
connection using up to a 2.0 MHz shift clock rate.
The digital code is shifted into the appropriate DAC and
multiplexer. These two blocks provide a tangential conversion
function to change the digital data into the appropriate DC coil
voltage. The major gauge driver can position a pointer anywhere
within a 360° circle while the minor gauge drivers are limited to an arc
of 112.2°.
The output buffers are capable of 70 mA per coil and are protected
against output short circuit conditions. A thermal protection circuit
limits the junction temperature to approximately 160°C.
An open−drain fault output goes low when any of the outputs are
shorted or the device is in a thermal shutdown state. This ASIC is
designed on POWERSENSE™ 3.0.
Features
• Serial Input Bus
• 2.0 MHz Operating Frequency
• Independently Addressable Gauges
• Tangential Drive Algorithm
• 70 mA Drive Circuits
• 0.75° Major Accuracy
• Power−On−Reset
• Protection Features
♦ Short Circuit
♦ Overtemperature
• Internally Fused Leads in SO−24L Package
http://onsemi.com
24
1
SO−24L
DWF SUFFIX
CASE 751E
MARKING
DIAGRAM
24
CS4122
AWLYYWW
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
1
SCLK
CS
SIN−
SIN+
GND
GND
GND
GND
VBB/2
C1+
C1−
VCC
24
SO
SI
COS+
COS−
GND
GND
GND
GND
C2−
C2+
VBB
FAULT
ORDERING INFORMATION
Device
Package
Shipping†
CS4122XDWF24 SO−24L 31 Units/Rail
CS4122XDWFR24 SO−24L 1000 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2004
May, 2004 − Rev. 8
1
Publication Order Number:
CS4122/D
1 page  
CS4122
APPLICATIONS INFORMATION
THEORY OF OPERATION
The CS4122 is for interfacing between a microcontroller
or microprocessor and air−core meters commonly used in
automotive vehicles for speedometers, tachometers and
auxiliary gauges. These meters are built using 2 coils placed
at 90° orientation to each other. A magnetized disc floats in
the middle of the coils and responds to the magnetic field
generated by each coil. The disc has a shaft attached to it that
protrudes out of the assembly. A pointer indicator is attached
to this shaft and in conjunction with a separate printed scale
displays the vehicle’s speed, engine’s speed or other
information such as fuel quantity or battery voltage.
The disc (and pointer) respond to the vector sum of the
voltages applied to the coils. Ideally, this relationship
follows a sine/cosine equation. Since this is a transcendental
and non−linear function, devices of this type use an
approximation for this relationship. The CS4122 uses a
tangential algorithm as shown in Figure 2 for the major
(360°) gauge. Only one output varies in any 45° range.
Note: The actual slopes are segmented but are shown here
as straight lines for simplicity.
0°
Max(128)
SIN+
Output
Min(0)
Max(128)
SIN−
Output
Min(0)
Degrees of Rotation
45° 90° 135° 180° 225° 270° 315° 360°
Max(128)
COS+
Output
Min(0)
Max(128)
COS−
Output
Min(0)
000 001 010 011 100 101 110 111 000
MUX bits (D9−D7)
Quadrant I
ƪ ƫq + Tan−1
(VSIN)) *
(VCOS)) *
(VSIN*)
(VCOS*)
For q + 0.176°to 44.824° :
VSIN + Tanq 0.748 VBB
VCOS + 0.748 VBB
For q + 45.176°to 89.824° :
VSIN + 0.748 VBB
VCOS + Tan(90° * q) 0.748
VBB
Quadrant II
ƪ ƫq + 180° * Tan−1
(VSIN)) *
(VCOS)) *
(VSIN*)
(VCOS*)
For q + 90.176°to 134.824° :
VSIN + 0.748 VBB
VCOS + *Tan (q * 90°) 0.748
VBB
For q + 135.176°to 179.824° :
VSIN + Tan(180° * q) 0.748
VCOS + *0.748 VBB
VBB
Quadrant III
ƪ ƫq + 180° ) Tan−1
(VSIN)) *
(VCOS)) *
(VSIN*)
(VCOS*)
For q + 180.176°to 224.824° :
VSIN + *Tan (q * 180°) 0.748
VCOS + *0.748 VBB
VBB
For q + 225.176°to 269.824° :
VSIN + *0.748 VBB
VCOS + *Tan (270° * q)
0.748
VBB
Figure 2. Major Gauge Outputs
http://onsemi.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet CS4122.PDF ] | |
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