参数资料
| 型号： | CAT5251WI-50-T1 |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC POT DPP 50K 256TAP 24SOIC |
| 标准包装： | 1,000 |
| 系列： | DPP |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 4 |
| 温度系数： | 标准值 300 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 6 线 SPI（芯片选择，设备位址） |
| 电源电压： | 2.5 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 带卷 (TR) |
CAT5251
http://onsemi.com
8
INSTRUCTION AND REGISTER DESCRIPTION
Device Type / Address Byte
The first byte sent to the CAT5251 from the
master/processor is called the Device Address Byte. The
most significant four bits of the Device Type address are a
device type identifier. These bits for the CAT5251 are fixed
at 0101[B] (refer to Figure 4).
The two least significant bits in the slave address byte, A1
A0, are the internal slave address and must match the
physical device address which is defined by the state of the
A1 A0 input pins for the CAT5251 to successfully continue
the command sequence. Only the device which slave
address matches the incoming device address sent by the
master executes the instruction. The A1 A0 inputs can be
actively driven by CMOS input signals or tied to VCC or
VSS. The remaining two bits in the device address byte must
be set to 0.
Instruction Byte
The next byte sent to the CAT5251 contains the
instruction and register pointer information. The four most
significant bits used provide the instruction opcode I3I0.
The R1 and R0 bits point to one of the four data registers of
each associated potentiometer. The least two significant bits
point to one of four Wiper Control Registers. The format is
shown in Figure 5.
Table 12. DATA REGISTER SELECTION
Data Register Selected
R1
R0
DR0
0
DR1
0
1
DR2
1
0
DR3
1
Figure 4. Identification Byte Format
ID3
ID2
ID1
ID0
0
A1
A0
010
1
(MSB)
(LSB)
Device Type
Identifier
Slave Address
Figure 5. 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 CAT5251 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 CAT5251 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 5 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.
Write in Process
The contents of the Data Registers are saved to
nonvolatile memory when the CS input goes HIGH after a
write sequence is received. The status of the internal write
cycle can be monitored by issuing a Read Status command
to read the Write in Process (WIP) bit.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT5251YI00 | 功能描述:数字电位计 IC DPP,NV,Quad 256 taps SPI RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| CAT5251YI-00 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT5251YI-00-T2 | 功能描述:数字电位计 IC DPP NV QUAD 256 TAP SPI RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| CAT5251YI50 | 功能描述:数字电位计 IC DPP,NV,Quad 256 taps SPI RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| CAT5251YI-50 | 制造商:ON Semiconductor 功能描述:IC DIGITAL POT 50KOHM 256 QUAD 24-TSSOP |
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