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參數(shù)資料
| 型號： | AS1500-Z-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 256 steps, SPI 10kΩ, DigiPot; Package Type: SOIC-8; Resistance: 10,00 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 398K |
| 代理商： | AS1500-Z-T |
www.austriamicrosystems.com
Revision 1.01
8 - 14
AS1500
Data Sheet
- Detailed Description
7 Detailed Description
Serial-Programming
Programming of the AS150x is done via the 3 wire serial interface. The three input signals are serial data input (SDI),
clock(CK) and chip select (CSN). A programming sequence consists of 10-bit, where the last eight bit contain the code
word for the resistor value. The first two bits A1 and A0 have to be low to program the resistor value (see Table 6).
Otherwise the resistor value is not affected. The data is shifted into the internal 10 Bit register with the rising edge of
the CK signal. With the rising edge of the CSN signal the data become valid and the resistance is updated
(see Figure
3)
. A detailed block diagram is shown in
Figure 4
.
Table 6. Serial data format (10 bits)
Figure 3. Timing Diagram
Figure 4. Detailed Timing Diagram
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
0
0
MSB
Data
LSB
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
1
0
1
0
0
VCC
0V
V
OUT
SDI
CK
CSN
DAC Register Load
A
x
or D
x
A
x
or D
x
t
CH
t
D
t
CSH
t
D
t
CL
t
CSS
t
CSWH
t
CS1
±
1% Error Band
1
0
1
0
0
1
0V
VCC
V
OUT
CSN
CK
SDI
t
S
t
CSWL
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