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    參數(shù)資料
    

    


    


    
型號(hào)：
MCP4531-503E/UN

    

    
元件分類(lèi)：
數(shù)字電位計(jì)

    

    
英文描述：
DIGITAL POTENTIOMETER, PDSO10

    

    
封裝：
PLASTIC, MSOP-10

    

    
文件頁(yè)數(shù)：
61/88頁(yè)

    

    
文件大?。?/td>
2310K

    

    
代理商：
MCP4531-503E/UN


    

    

    

	
    
    
    

    
    
	
    MCP453X/455X/463X/465X
    DS22096A-page 64
     2008 Microchip Technology Inc.
    8.2
    Using Shutdown
    Figure 8-3 shows a possible application circuit where
    the independent terminals could be used. Disconnect-
    ing the wiper allows the transistor input to be taken to
    the Bias voltage level (disconnecting A and or B may be
    desired to reduce system current). Disconnecting Ter-
    minal A modifies the transistor input by the RBW rheo-
    stat value to the Common B. Disconnecting Terminal B
    modifies the transistor input by the RAW rheostat value
    to the Common A. The Common A and Common B
    connections could be connected to VDD and VSS.
    FIGURE 8-3:
    Example Application Circuit
    using Terminal Disconnects.
    8.3
    Software Reset Sequence
    At times it may become necessary to perform a Soft-
    ware Reset Sequence to ensure the MCP45XX/46XX
    device is in a correct and known I2C Interface state.
    This technique only resets the I2C state machine.
    This is useful if the MCP45XX/46XX device powers up
    in an incorrect state (due to excessive bus noise, ...), or
    if the Master Device is reset during communication.
    Figure 8-4 shows the communication sequence to soft-
    ware reset the device.
    FIGURE 8-4:
    Software Reset Sequence
    Format.
    The 1st Start bit will cause the device to reset from a
    state in which it is expecting to receive data from the
    Master Device. In this mode, the device is monitoring
    the data bus in Receive mode and can detect the Start
    bit forces an internal Reset.
    The nine bits of ‘1’ are used to force a Reset of those
    devices that could not be reset by the previous Start bit.
    This occurs only if the MCP45XX/46XX is driving an A
    bit on the I2C bus, or is in output mode (from a Read
    command) and is driving a data bit of ‘0’ onto the I2C
    bus. In both of these cases, the previous Start bit could
    not be generated due to the MCP45XX/46XX holding
    the bus low. By sending out nine ‘1’ bits, it is ensured
    that the device will see a A bit (the Master Device does
    not drive the I2C bus low to acknowledge the data sent
    by the MCP45XX/46XX), which also forces the
    MCP45XX/46XX to reset.
    The 2nd Start bit is sent to address the rare possibility
    of an erroneous write. This could occur if the Master
    Device was reset while sending a Write command to
    the MCP45XX/46XX, AND then as the Master Device
    returns to normal operation and issues a Start condition
    while the MCP45XX/46XX is issuing an Acknowledge.
    In this case, if the 2nd Start bit is not sent (and the Stop
    bit was sent) the MCP45XX/46XX could initiate a write
    cycle.
    The Stop bit terminates the current I2C bus activity. The
    MCP45XX/46XX wait to detect the next Start condition.
    This sequence does not effect any other I2C devices
    which may be on the bus, as they should disregard this
    as an invalid command.
    Note:
    This technique is documented in AN1028.
    Balance
    Bias
    W
    B
    Input
    To base
    of Transistor
    (or Amplifier)
    A
    Common B
    Common A
    Note:
    The potential for this erroneous write
    ONLY occurs if the Master Device is reset
    while sending a Write command to the
    MCP45XX/46XX.
    S
    ‘1’
    S
    P
    Start
    bit
    Nine bits of ‘1’
    Start bit
    Stop bit
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
MCP4531T-103E/MF
DIGITAL POTENTIOMETER, PDSO8

    

    
MCP4531T-103E/ML
DIGITAL POTENTIOMETER, PQCC16

    

    
MCP4531T-103E/MS
DIGITAL POTENTIOMETER, PDSO8

    

    
MCP4531T-104E/MS
DIGITAL POTENTIOMETER, PDSO8

    

    
MCP4531T-104E/UN
DIGITAL POTENTIOMETER, PDSO10

    

    

    

    


    


    

    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
MCP4531T-103E/MF
功能描述:數(shù)字電位計(jì) IC Sngl 7B V I2C POT RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel

    

    
MCP4531T-103E/MS
功能描述:數(shù)字電位計(jì) IC Sngl 7B V I2C POT RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel

    

    
MCP4531T-104E/MF
功能描述:數(shù)字電位計(jì) IC Sngl 7B V I2C POT RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel

    

    
MCP4531T-104E/MS
功能描述:數(shù)字電位計(jì) IC Sngl 7B V I2C POT RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel

    

    
MCP4531T-502E/MF
功能描述:數(shù)字電位計(jì) IC Sngl 7B V I2C POT RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel

    

    
    
    
    
	
    	
    
    
     
     
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