參數(shù)資料
型號(hào)： MCP4541T-104E/MS
廠商： Microchip Technology
文件頁(yè)數(shù)： 44/92頁(yè)
文件大?。?/td> 0K
描述： IC POT DGTL 100K SGL 8-MSOP
標(biāo)準(zhǔn)包裝： 2,500
接片： 129
電阻（歐姆）： 100k
電路數(shù)： 1
溫度系數(shù)： 標(biāo)準(zhǔn)值 150 ppm/°C
存儲(chǔ)器類型： 非易失
接口： I²C（設(shè)備位址）
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-MSOP
包裝： 帶卷 (TR)
2008 Microchip Technology Inc.
DS22107A-page 49
MCP454X/456X/464X/466X
6.2.1.4
Repeated Start Bit
The Repeated Start bit (see Figure 6-5) indicates the
current Master Device wishes to continue communicat-
ing with the current Slave Device without releasing the
I2C bus. The Repeated Start condition is the same as
the Start condition, except that the Repeated Start bit
follows a Start bit (with the Data bits + A bit) and not a
Stop bit.
The Start bit is the beginning of a data transfer
sequence and is defined as the SDA signal falling when
the SCL signal is “High”.
FIGURE 6-5:
Repeat Start Condition
Waveform.
6.2.1.5
Stop Bit
The Stop bit (see Figure 6-6) Indicates the end of the
I2C Data Transfer Sequence. The Stop bit is defined as
the SDA signal rising when the SCL signal is “High”.
A Stop bit resets the I2C interface of all MCP4XXX
devices.
FIGURE 6-6:
Stop Condition Receive or
Transmit Mode.
6.2.2
CLOCK STRETCHING
“Clock Stretching” is something that the receiving
Device can do, to allow additional time to “respond” to
the “data” that has been received.
The MCP4XXX will not strech the clock signal (SCL)
since memory read acceses occur fast enough.
6.2.3
ABORTING A TRANSMISSION
If any part of the I2C transmission does not meet the
command format, it is aborted. This can be intentionally
accomplished with a START or STOP condition. This is
done so that noisy transmissions (usually an extra
START or STOP condition) are aborted before they
corrupt the device.
FIGURE 6-7:
Typical 8-Bit I2C Waveform Format.
FIGURE 6-8:
I2C Data States and Bit Sequence.
Note 1: A bus collision during the Repeated Start
condition occurs if:
SDA is sampled low when SCL goes
from low to high.
SCL goes low before SDA is asserted
low. This may indicate that another
master is attempting to transmit a
data "1".
SDA
SCL
Sr = Repeated Start
1st Bit
SCL
SDA A / A
P
1st Bit
SDA
SCL
S
2nd Bit
3rd Bit
4th Bit
5th Bit
6th Bit
7th Bit
8th Bit
P
A / A
SCL
SDA
START
Condition
STOP
Condition
Data allowed
to change
Data or
A valid
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