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PDF CS4192 Data sheet ( Hoja de datos )
| Número de pieza | CS4192 | |
| Descripción | Single Air-Core Gauge Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CS4192
Single Air−Core Gauge
Driver
The CS4192 is a monolithic BiCMOS integrated circuit used to
translate a digital 10−bit word from a microprocessor/microcontroller
to complementary DC outputs. The DC outputs drive an air−core
meter commonly used in vehicle instrument panels. The 10 bits of data
are used to linearly control the quadrature coils of the meter directly
with a 0.35° resolution and ±1.2° accuracy over the full 360° range of
the gauge. The interface from the microcontroller is by a Serial
Peripheral Interface (SPI) compatible serial connection using up to a
2.0 MHz shift clock rate.
The digital code, which is directly proportional to the desired gauge
pointer deflection, is shifted into a DAC and multiplexer. These two
blocks provide a tangential conversion function to change the digital
data into the appropriate DC coil voltage for the angle demanded. The
tangential algorithm creates approximately 40% more torque in the
meter movement than does a sin−cos algorithm at 45°, 135°, 225°, and
315° angles. This increased torque reduces the error due to pointer
droop at these critical angles.
Each output buffer is capable of supplying up to 70 mA per coil and
the buffers are controlled by a common OE enable pin. The output
buffers are turned off when OE is brought low, while the logic portion
of the chip remains powered and continues to operate normally. OE
must be high before the falling edge of CS to enable the output buffers.
The status pin (ST) reflects the state of the outputs and is low
whenever the outputs are disabled.
The Serial Gauge Driver is self−protected against fault conditions.
Each driver is protected for 125 mA (typ) overcurrent while a global
thermal protection circuit limits junction temperature to 170°C (typ).
The output drivers are disabled anytime the IC protection circuitry
detects an overcurrent or overtemperature fault. The drivers remain
disabled until a falling edge is presented on CS. If the fault is still
present, the output drivers automatically disable themselves again.
Features
• Serial Input Bus
• 2.0 MHz Operating Frequency
• Tangential Drive Algorithm
• 70 mA Drive Circuits
• 0.5° Accuracy (Typ)
• Power−On−Reset
• Protection Features
♦ Output Short Circuit
♦ Overtemperature
• Internally Fused Leads in SOIC−16 WB Package
• Pb−Free Packages are Available*
*For additional information on our Pb−Free strategy and soldering details,
please download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
September, 2005 − Rev. 7
1
http://onsemi.com
16
1
SOIC−16 WB
DWF SUFFIX
CASE 751G
MARKING DIAGRAM
16
CS4192
AWLYYWWG
1
CS4192
A
WL
YY
WW
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
1
SIN−
SIN+
VBB
GND
GND
SI
VCC
OE
16
COS+
COS−
SO
GND
GND
ST
CS
SCLK
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
Publication Order Number:
CS4192/D
1 page  
CS4192
APPLICATIONS INFORMATION
THEORY OF OPERATION
The SACD is for interfacing between a microcontroller or
microprocessor and air−core meter movements commonly
used in automotive vehicles for speedometers and
tachometers. These movements are built using two coils
placed at a 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 or the engine’s
speed.
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 SACD uses a
tangential algorithm as shown in Figure 2. Only one output
varies in any 45 degree range.
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
MUX bits (D9−D7)
110
Figure 2. SIN, COS Outputs
111 000
Quadrant I
ƪ ƫq + Tan−1
VSIN)
VCOS)
* VSIN*
* VCOS*
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
Quadrant IV
ƪ ƫq + 360° * Tan−1
VSIN)
VCOS)
* VSIN*
* VCOS*
For q + 270.176°to 314.824° :
VSIN + *0.748 VBB
VCOS + Tan(q * 270°) 0.748
VBB
For q + 315.176° * 359.824° :
VSIN + *Tan (360° * q) 0.748
VCOS + 0.748 VBB
VBB
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
http://onsemi.com
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5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CS4192.PDF ] | |
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