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| 型号： | MCP4461T-103E/ML |
| 厂商： | Microchip Technology |
| 文件页数： | 73/100页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 257TAPS 10K 20QFN |
| 标准包装： | 3,300 |
| 接片： | 257 |
| 电阻（欧姆）： | 10k |
| 电路数： | 4 |
| 温度系数： | 标准值 150 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | I²C（设备位址） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
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MCP444X/446X
DS22265A-page 74
2010 Microchip Technology Inc.
8.2
Using Shutdown Modes
Figure 8-3 shows a possible application circuit where
the
independent
terminals
could
be
used.
Disconnecting 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 Terminal A modifies the transistor input
by the RBW rheostat 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
Software Reset Sequence to ensure the MCP44XX
device is in a correct and known I2C Interface state.
This technique only resets the I2C state machine.
This is useful if the MCP44XX device powers up in an
incorrect state (due to excessive bus noise, etc), or if
the Master Device is reset during communication.
Figure 8-4 shows the communication sequence to
software 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 MCP44XX 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 MCP44XX 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
MCP44XX), which also forces the MCP44XX 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 MCP44XX, AND then as the Master Device returns
to normal operation and issues a Start condition while
the MCP44XX is issuing an Acknowledge. In this case,
if the 2nd Start bit is not sent (and the Stop bit was sent)
the MCP44XX could initiate a write cycle.
The Stop bit terminates the current I2C bus activity. The
MCP44XX waits 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.
Balance
Bias
W
B
Input
To base
of Transistor
(or Amplifier)
A
Common B
Common A
Note:
This technique is documented in AN1028.
Note:
The potential for this erroneous write
ONLY occurs if the Master Device is reset
while sending a Write command to the
MCP44XX.
S
‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’
S
P
Start
bit
Nine bits of ‘1’
Start bit
Stop bit
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相关代理商/技术参数 |
参数描述 |
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| MCP4461T-104E/ML | 功能描述:数字电位计 IC 100k I2C Qd Ch 8bit Nonvolatile memory 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 |
| MCP4461T-104E/ST | 功能描述:数字电位计 IC 100k I2C Qd Ch 8bit Nonvolatile memory 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 |
| MCP4461T-502E/ML | 功能描述:数字电位计 IC 5k I2C Qd Ch 8bit Nonvolatile memory 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 |
| MCP4461T-502E/ST | 功能描述:数字电位计 IC 5k I2C Qd Ch 8bit Nonvolatile memory 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 |
| MCP4461T-503E/ML | 功能描述:数字电位计 IC 50k I2C Qd Ch 8bit Nonvolatile memory 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 |
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