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| 型號： | MCP40D19T-503E/LT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 30/43頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 50K 128TAPS SC70-5 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 接片： | 128 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 1 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)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（5 引線），SC-88A，SOT-353 |
| 供應(yīng)商設(shè)備封裝： | SC-70-5 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 674 (CN2011-ZH PDF) |
| 其它名稱： | MCP40D19T-503E/LTDKR |
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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-
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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