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參數(shù)資料
| 型號： | CS4122XDWFR24G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DRIVER TRIPLE AIR CORE 24SOIC |
| 產(chǎn)品變化通告： | Product Discontinuation 09/Jan/2008 |
| 標準包裝： | 1,000 |
| 類型： | 驅動器 |
| 驅動器/接收器數(shù)： | 3/0 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | CS4122XDWFR24GOS |
CS4122
http://onsemi.com
5
APPLICATIONS INFORMATION
THEORY OF OPERATION
The CS4122 is for interfacing between a microcontroller
or microprocessor and aircore 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 nonlinear 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.
SIN+
Output
Max(128)
SIN
Output
COS+
Output
COS
Output
Max(128)
Min(0)
0
°
45
°
90
°
135
°
180
°
225
°
270
°
315
° 360°
000
001
010
011
100
101
110
111
000
MUX bits (D9D7)
Degrees of Rotation
Figure 2. Major Gauge Outputs
Quadrant I
q + Tan1
(VSIN
)) * (VSIN*)
(VCOS
)) * (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
q + 180° * Tan1
(VSIN
)) * (VSIN*)
(VCOS
)) * (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
VBB
VCOS +*0.748
VBB
Quadrant III
q + 180° ) Tan1
(VSIN
)) * (VSIN*)
(VCOS
)) * (VCOS*)
For
q + 180.176°to 224.824° :
VSIN +*Tan (q * 180°)
0.748
VBB
VCOS +*0.748
VBB
For
q + 225.176°to 269.824° :
VSIN +*0.748
VBB
VCOS +*Tan (270° * q)
0.748
VBB
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