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CAT5259WI-50 参数 Datasheet PDF下载

CAT5259WI-50图片预览
型号: CAT5259WI-50
PDF下载: 下载PDF文件 查看货源
内容描述: 四路数字可编程电位计( DPP ™ )与256丝锥和I²C接口 [Quad Digitally Programmable Potentiometers (DPP⑩) with 256 Taps and IC Interface]
分类和应用: 转换器电阻器光电二极管
文件页数/大小: 16 页 / 276 K
品牌: CATALYST [ CATALYST SEMICONDUCTOR ]
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CAT5259  
Register. Any data changes in one of the Data  
Registers is a non-volatile operation and will take a  
maximum of 10ms.  
WIPER CONTROL AND DATA REGISTERS  
Wiper Control Register (WCR)  
The CAT5259 contains four 8-bit Wiper Control  
Registers, one for each potentiometer. The Wiper  
Control Register output is decoded to select one of  
256 switches along its resistor array. The contents of  
the WCR can be altered in four ways: it may be  
written by the host via Write Wiper Control Register  
instruction; it may be written by transferring the  
contents of one of four associated Data Registers via  
the XFR Data Register instruction, it can be modified  
one step at a time by the Increment/decrement  
instruction (see Instruction section for more details).  
Finally, it is loaded with the content of its data register  
zero (DR0) upon power-up.  
If the application does not require storage of multiple  
settings for the potentiometer, the Data Registers can  
be used as standard memory locations for system  
parameters or user preference data.  
INSTRUCTIONS  
Four of the nine instructions are three bytes in length.  
These instructions are:  
Read Wiper Control Register – read the current  
wiper position of the selected potentiometer in the  
WCR  
Write Wiper Control Register – change current  
wiper position in the WCR of the selected  
potentiometer  
The Wiper Control Register is a volatile register that  
loses its contents when the CAT5259 is powered-  
down. Although the register is automatically loaded  
with the value in DR0 upon power-up, this may be  
different from the value present at power-down.  
Read Data Register – read the contents of the  
selected Data Register  
Write Data Register – write a new value to the  
selected Data Register  
Data Registers (DR)  
The basic sequence of the three byte instructions is  
illustrated in Figure 8. These three-byte instructions  
Each potentiometer has four 8-bit non-volatile Data  
Registers. These can be read or written directly by the  
host. Data can also be transferred between any of the  
four Data Registers and the associated Wiper Control  
Table 3. Instruction Set  
Instruction Set  
Instruction  
Read Wiper Control  
Register  
Write Wiper Control  
Register  
Operation  
I3 I2 I1 I0 R1 R0 WCR1/P1 WCR0/P0  
Read the contents of the Wiper Control  
Register pointed to by P1-P0  
Write new value to the Wiper Control  
Register pointed to by P1-P0  
Read the contents of the Data Register  
pointed to by P1-P0 and R1-R0  
Write new value to the Data Register  
pointed to by P1-P0 and R1-R0  
1
1
1
1
0
0
0
1
0
1
1
0
1
0
1
0
0
0
0
0
1/0  
1/0  
1/0  
1/0  
1/0  
1/0  
1/0  
1/0  
Read Data Register  
Write Data Register  
1/0 1/0  
1/0 1/0  
Transfer the contents of the Data Register  
pointed to by P1-P0 and R1-R0 to its  
associated Wiper Control Register  
Transfer the contents of the Wiper Control  
Register pointed to by P1-P0 to the Data  
Register pointed to by R1-R0  
Transfer the contents of the Data Registers  
pointed to by R1-R0 of all four pots to their  
respective Wiper Control Registers  
Transfer the contents of both Wiper Control  
Registers to their respective data Registers  
pointed to by R1-R0 of all four pots  
Enable Increment/decrement of the Control  
Latch pointed to by P1-P0  
XFR Data Register to  
Wiper Control Register  
1
1
0
1
1
0
0
1
0
1
0
1
1/0 1/0  
1/0 1/0  
1/0 1/0  
1/0 1/0  
1/0  
1/0  
0
1/0  
1/0  
0
XFR Wiper Control  
Register to Data  
Register  
Gang XFR Data  
Registers to Wiper  
Control Registers  
Gang XFR Wiper  
Control Registers to  
Data Register  
1
0
0
0
0
1
0
0
0
0
Increment/Decrement  
Wiper Control Register  
0
0
1/0  
1/0  
Note: 1/0 = data is one or zero.  
© Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
9
Doc. No. MD-2000 Rev. H