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CS4172 датащи(PDF) 5 Page - Cherry Semiconductor Corporation

номер детали CS4172
подробное описание детали  Single Air-Core Gauge Driver
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производитель  CHERRY [Cherry Semiconductor Corporation]
домашняя страница  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS4172 датащи(HTML) 5 Page - Cherry Semiconductor Corporation

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Applications Information: continued
5
To drive the gaugeÕs pointer to a particular angle, the
microcontroller sends a 10-bit digital word into the serial
port. These 10 bits are divided as shown in Figure 2.
However, from a software programmers viewpoint, a
360¡ circle is divided into 1024 equal parts of .35¡ each.
Table 1 shows the data associated with the 45¡ divisions
of the 360¡ driver.
Figure 2. Definition of serial word.
Table 1. Nominal output for major gauge (VBB = 14V).
The 10 bits are shifted into the deviceÕs shift register MSB
first using an SPI compatible scheme. This method is
shown in Figure 3. The CS must be high and remain high
for SCLK to be enabled. Data on SI is shifted in on the ris-
ing edge of the synchronous clock signal. Data in the shift
register changes at 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.
Figure 3. Serial data timing diagram.
Figure 4. Power-up sequence.
10 Bits
VCC
CS
SI
OE
ST
10 Bits
OUTPUTS
ENABLED
OUTPUTS
ENABLED
SO(tpd)
SO(Rise, Fall)
10% - 90%
SI(Hold)
SI(Setup)
SCLK
SI
SO
CSHold
CS
CSSetup
Input Code
Ideal
Nominal
VSIN
VCOS
(Decimal)
Degrees
Degrees
(V)
(V)
0
0
0.176
0.032
10.476
128
45
45.176
10.476
10.412
256
90
90.176
10.476
-0.032
384
135
135.176
10.412
-10.476
512
180
180.176
-0.032
-10.476
640
225
225.176
-10.476
-10.412
768
270
270.176
-10.476
0.032
896
315
315.176
-10.476
10.476
1023
359.65
359.826
-0.032
10.476
Major
Gauge
(360
°)
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
D9 Ð D7 select
which octant
Divides a 45
° octant into 128 equal parts
to achieve a .35
° resolution
Code 0 Ð 12710
MSB
LSB
Application Diagram
ENABLE
CS4172
10k
SCLK
SI
COS-
COS+
SIN-
SIN+
SO
OE
CS
ST
VBB
VCC
Microcontroller
Next Driver
360
° Gauge
VBAT
VREG
CS-8156
5V
12V


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