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參數(shù)資料
型號： MCP40D17T-502E/LT
廠商： Microchip Technology
文件頁數(shù)： 30/43頁
文件大小： 0K
描述： IC DGTL POT 5K 128TAPS SC70-6
標準包裝： 1
接片： 128
電阻（歐姆）： 5k
電路數(shù)： 1
溫度系數(shù)： 標準值 150 ppm/°C
存儲器類型： 易失
接口： I²C
電源電壓： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 6-TSSOP，SC-88，SOT-363
供應商設備封裝： SC-70-6
包裝： 標準包裝
產(chǎn)品目錄頁面： 674 (CN2011-ZH PDF)
其它名稱： MCP40D17T-502E/LTDKR
MCP40D17/18/19
DS22152B-page 36
2009 Microchip Technology Inc.
5.2.9
I2C COMMAND PROTOCOL
The MCP40D17/18/19 is a slave I2C device which
supports 7-bit slave addressing. The slave address
contains seven fixed bits. Figure 5-9 shows the control
byte format.
5.2.9.1
Control Byte (Slave Address)
The Control Byte is always preceded by a START
condition. The Control Byte contains the slave address
consisting of seven fixed bits and the R/W bit. Figure 5-
9 shows the control byte format and Table 5-2 shows
the I2C address for the devices.
All devices are offered with the I2C slave address of
“0101110”, while the MCP40D18 also offers a second
standard I2C slave address of “0111110”.
FIGURE 5-9:
Slave Address Bits in the
I2C Control Byte (Slave Address = “0101110”).
TABLE 5-2:
DEVICE I2C ADDRESS
5.2.9.2
Hardware Address Pins
The MCP40D17/MCP40D18/MCP40D19 does not
support hardware address bits.
5.2.10
GENERAL CALL
The General Call is a method that the Master device
can communicate with all other Slave devices.
The MCP40D17/18/19 devices do not respond to
General Call address and commands, and therefore
the communications are Not Acknowledged.
FIGURE 5-10:
General Call Formats.
SA6 A5A4A3A2 A1A0 R/W
A/A
Start
bit
Slave Address
R/W bit
A bit (controlled by slave device)
R/W = 0 = write
R/W = 1 = read
A = 0 = Slave Device Acknowledges byte
A = 1 = Slave Device does not Acknowledge byte
“0” “1” “0” “1” “1” “1” “0”
Device
I2C Address
Comment
MCP40D17
‘0101110’
MCP40D18
‘0101110’
MCP40D18-xxxE/LT
‘0111110’
MCP40D18-xxxAE/LT
MCP40D19
‘0101110’
0
000
S
000
0
X
XX
X
A
XX0 A
P
General Call Address
Second Byte
“7-bit Command”
Reserved 7-bit Commands (By I2C Specification - Philips # 9398 393 40011, Ver. 2.1 January 2000)
“0000 011”b
- Reset and write programmable part of slave address by hardware
“0000 010”b
- Write programmable part of slave address by hardware
“0000 000”b
- NOT Allowed
The Following is a “Hardware General Call” Format
0
00
0
S
0
000
X
X XXX
A
XX1A
General Call Address
Second Byte
“7-bit Command”
X
X X
XX
XX X
A
P
n occurrences of (Data + A / A)
This indicates a “Hardware General Call”
MCP40D17/18/19 will ignore this byte and
all following bytes (and A), until a Stop bit
(P) is encountered.
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