Software I2" />
參數(shù)資料
型號： ADM00317
廠商： Microchip Technology
文件頁數(shù)： 68/86頁
文件大?。?/td> 0K
描述： BOARD DAUGHTER MCP4706/16/26
標準包裝： 1
DAC 的數(shù)量： 3 個，每 IC 1 個
位數(shù)： 8，10，12
設置時間： 6µs
DAC 型： 電壓
已供物品： 子板
已用 IC / 零件： MCP4706，MCP4716，MCP4726
MCP4706/4716/4726
DS22272C-page 70
2011-2012 Microchip Technology Inc.
8.9
Software I2C Interface Reset
Sequence
At times, it may become necessary to perform a
Software Reset Sequence to ensure the MCP47X6
device is in a correct and known I2C interface state.
This technique only resets the I2C state machine.
This is useful if the MCP47X6 device powers up in an
incorrect state (due to excessive bus noise, etc), or if
the master device is reset during communication.
Figure 8-9 shows the communication sequence to
software reset the device.
FIGURE 8-9:
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 if 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 MCP47X6 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 MCP47X6 holding the bus
low. By sending out nine ‘1’ bits, it is ensured that the
device will see an A bit (the master device does not
drive the I2C bus low to acknowledge the data sent by
the MCP47X6), which also forces the MCP47X6 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
MCP47X6, AND then as the master device returns to
normal operation and issues a Start condition, while the
MCP47X6 is issuing an acknowledge. In this case, if
the 2nd Start bit is not sent (and the Stop bit was sent)
the MCP47X6 could initiate a write cycle.
The Stop bit terminates the current I2C bus activity. The
MCP47X6 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.
Note:
This technique is documented in AN1028.
S‘1’‘1’‘1’‘1’‘1’‘1’‘1’‘1’
S
P
Start
bit
Nine bits of ‘1’
Start bit
Stop bit
Note:
The potential for this erroneous write
ONLY occurs if the master device is reset
while sending a Write command to the
MCP47X6.
相關PDF資料
PDF描述
SLP471M200E1P3 CAP ALUM 470UF 200V 20% SNAP
PCX1H330MCL1GS CAP ALUM 33UF 50V 20% SMD
R-725.0D CONV DC/DC 2A 6.5-28VIN 5V
SLPX391M250A5P3 CAP ALUM 390UF 250V 20% SNAP
RBM12DCBD CONN EDGECARD 24POS R/A .156 SLD
相關代理商/技術參數(shù)
參數(shù)描述
ADM00333 功能描述:開發(fā)板和工具包 - PIC / DSPIC PIC18F87J72 Evaluation Board RoHS:否 制造商:Microchip Technology 產品:Starter Kits 工具用于評估:chipKIT 核心:Uno32 接口類型: 工作電源電壓:
ADM00344 功能描述:電源管理IC開發(fā)工具 RE46C190 Demo Board RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
ADM00345 功能描述:電源管理IC開發(fā)工具 3-Phase BLDC Snsrlss Fan Cntrllr RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
ADM00352 功能描述:電源管理IC開發(fā)工具 MCP16301 600mA Demo Board RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
ADM00360 功能描述:電源管理IC開發(fā)工具 MCP16301 300mA D2PAK Footprint Demo Board RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*