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CS4172 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS4172은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 CS4172 자료 제공

부품번호 CS4172 기능
기능 Single Air-Core Gauge Driver
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS4172 데이터시트, 핀배열, 회로
CS4172
Single Air-Core Gauge Driver
Description
The CS4172 is a monolithic BiCMOS
integrated circuit used to translate a
digital 10-bit word from a micropro-
cessor/microcontroller to complemen-
tary 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 con-
trol the quadrature coils of the meter
directly with a 0.35¡ resolution and
±1.0¡ accuracy over the full 360¡ range
of the gauge. The interface from the
microcontroller is by a Serial Periph-
eral Interface (SPI) compatible serial
connection using up to a 2MHz shift
clock rate.
The digital code, which is directly pro-
portional 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 appro-
priate 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 sup-
plying up to 80mA per coil and are
controlled by a common enable pin.
When OE is low the output buffers are
turned off but the logic portion of the
chip remains powered and continues
to operate normally.
The Serial Gauge Driver is self-protect-
ed against output short circuit condi-
tions. The output drivers are disabled
anytime the on-chip protection circuit-
ry detects a short circuit condition. The
outputs remain off until a falling edge
is presented on CS. If the short circuit
is still present the output drivers auto-
matically disable themselves again. A
thermal protection circuit limits the
junction temperature to approximately
160¡C for conditions of high supply
voltage and high ambient temperature.
The status pin (ST) reflects the state of
the outputs and is low whenever the
outputs are disabled.
Block Diagram
VCC
VBB
POR
LOGIC
Features
s Serial Input Bus
s 2 MHz Operating
Frequency
s Tangential Drive
Algorithm
s 80mA Drive Circuits
s 0.5¡ Accuracy (Typ.)
s Power-On-Reset
s Protection Features
Output Short Circuit
Overtemperature
Package Options
16 Lead PDIP
SIN- 1
SIN+
Gnd
VBB
SO
SI
VCC
OE
COS+
COS-
Gnd
Gnd
NC
ST
CS
SCLK
SI
SCLK
CS
SO
ST
OE
Serial
to
Parallel
Shift
Register
D0 Ð D6
7 Bit
DAC
D7 Ð D9
VTOP
VVAR
VBAT
R FAULT S
Latch S
POR
MUX
OC
Output
Amplifiers
SIN+
SINÐ
COS+
COSÐ
Gnd
Rev. 4/19/99
1
16 Lead SO Wide
(internally fused leads)
SIN- 1
SIN+
COS+
COS-
VBB SO
Gnd Gnd
Gnd Gnd
SI ST
VCC
CS
OE SCLK
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
A ¨ Company




CS4172 pdf, 반도체, 판매, 대치품
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 2 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 point-
er indicator is attached to this shaft and in conjunction
with a separate printed scale displays the vehicleÕs speed
or the engineÕs speed.
The disc (and pointer) respond to the vector sum of the
voltages applied to the coils. Ideally, this relationship fol-
sine
lows a cosine equation. Since this is a transcendental and
non-linear function, devices of this type use an approxi-
mation for this relationship. The SACD uses a tangential
algorithm as shown in Figure 1. Only 1 output varies in
any 45 degree range.
Quadrant II
[ ]q = 180¡ Ð Tan-1
VSIN+ Ð VSIN-
VCOS+ Ð VCOS-
For q = 90.176¡ to 134.824¡:
VSIN = 0.748 ´ VBB
VCOS = -Tan(q Ð 90¡) ´ 0.748 ´ VBB
For q = 135.176¡ to 179.824¡:
VSIN = Tan(180¡ Ð q) ´ 0.748 ´ VBB
VCOS = -0.748 ´ VBB
Quadrant III
[ ]q = 180¡ + Tan-1
VSIN+ Ð VSIN-
VCOS+ Ð VCOS-
For q = 180.176¡ to 224.824¡:
VSIN = -Tan(q Ð 180¡) ´ 0.748 ´ VBB
VCOS = -0.748 ´ VBB
SIN+
Output
0°
Max (128)
Min (0)
SINÐ
Output
Max (128)
Min (0)
Degrees of Rotation
45°
90°
135°
180° 225° 270°
315°
360°
COS+
Output
Max (128)
Min (0)
COSÐ
Output
Max (128)
Min (0)
000 001 010
011
100 101
110
111
000
MUX bits (D9 Ð D7)
Figure 1. Major gauge outputs.
Quadrant I
[ ]q = Tan-1
VSIN+ Ð VSIN-
VCOS+ Ð 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¡ Ð q) ´ 0.748 ´ VBB
For q = 225.176¡ Ð 269.824¡:
VSIN = -0.748 ´ VBB
VCOS = -Tan(270¡ Ð q) ´ 0.748 ´ VBB
Quadrant IV
[ ]q = 360¡ Ð Tan-1
VSIN+ Ð VSIN-
VCOS+ Ð VCOS-
For q = 270.176¡ to 314.824¡:
VSIN = -0.748 ´ VBB
VCOS = Tan(q Ð 270¡) ´ 0.748 ´ VBB
For q = 315.176¡ Ð 359.824¡:
VSIN = -Tan(360¡ Ð q) ´ 0.748 ´ VBB
VCOS = 0.748 ´ VBB
270°
VSINÐ
VCOS+
360/0°
0.748VBB
q
IV
I
0.748VBB
0.748VBB
III II
0.748VBB
180°
VCOS-
Graph 1. Major gauge response.
4
90°
VSIN+

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