參數(shù)資料
型號(hào): CAT5259WI-00-T1
廠商: ON Semiconductor
文件頁(yè)數(shù): 15/15頁(yè)
文件大?。?/td> 0K
描述: IC POT DPP 100K 256TAP 24SOIC
標(biāo)準(zhǔn)包裝: 1,000
接片: 256
電阻(歐姆): 100k
電路數(shù): 4
溫度系數(shù): 標(biāo)準(zhǔn)值 300 ppm/°C
存儲(chǔ)器類型: 非易失
接口: I²C(設(shè)備位址)
電源電壓: 2.5 V ~ 6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC
包裝: 帶卷 (TR)
CAT5259
http://onsemi.com
9
Figure 9. Instruction Byte Format
I3
I2
I1
I0
R1
R0
P1
P0
(MSB)
(LSB)
Instruction
Data Register
WCR/Pot Selection
Opcode
Selection
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.
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.
Data Registers (DR)
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 Register. Any
data changes in one of the Data Registers is a non-volatile
operation and will take a maximum of 10 ms.
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
Read Data Register – read the contents of the selected
Data Register
Write Data Register – write a new value to the
selected Data Register
Table 13. INSTRUCTION SET (Note: 1/0 = data is one or zero.)
Instruction
Instruction Set
Operation
I3
I2
I1
I0
R1
R0
WCR1/P1
WCR0/P0
Read Wiper Control
Register
1
0
1
0
1/0
Read the contents of the Wiper Control
Register pointed to by P1P0
Write Wiper Control
Register
1
0
1
0
1/0
Write new value to the Wiper Control Register
pointed to by P1P0
Read Data Register
1
0
1
1/0
Read the contents of the Data Register pointed
to by P1P0 and R1R0
Write Data Register
1
0
1/0
Write new value to the Data Register pointed to
by P1P0 and R1R0
XFR Data Register to
Wiper Control Register
1
0
1
1/0
Transfer the contents of the Data Register
pointed to by P1P0 and R1R0 to its
associated Wiper Control Register
XFR Wiper Control
Register to Data
Register
1
0
1/0
Transfer the contents of the Wiper Control
Register pointed to by P1P0 to the Data
Register pointed to by R1R0
Gang XFR Data
Registers to Wiper
Control Registers
0
1
1/0
0
Transfer the contents of the Data Registers
pointed to by R1R0 of all four pots to their
respective Wiper Control Registers
Gang XFR Wiper Control
Registers to Data
Register
1
0
1/0
0
Transfer the contents of both Wiper Control
Registers to their respective data Registers
pointed to by R1R0 of all four pots
Increment/Decrement
Wiper Control Register
0
1
0
1/0
Enable Increment/decrement of the Control
Latch pointed to by P1P0
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