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参数资料
| 型号： | MCP3421DM-WS |
| 厂商： | Microchip Technology |
| 文件页数： | 10/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO MCP3421 WEIGHT SCALE |
| 标准包装： | 1 |
| 主要目的： | 参考设计，称量台 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP3421，MCP6V07，PIC18F4550 |
| 主要属性： | 2Kg测压元件，灵敏度为1 mV/V |
| 已供物品： | 板，线缆，CD，电源 |
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MCP3421
DS22003E-page 18
2009 Microchip Technology Inc.
FIGURE 5-1:
MCP3421 Address Byte.
5.3.2
WRITING A CONFIGURATION BYTE
TO THE DEVICE
When the Master sends an address byte with the R/W
bit low (R/W = 0), the MCP3421 expects one
configuration byte following the address. Any byte sent
after this second byte will be ignored. The user can
change the operating mode of the device by writing the
configuration register bits.
If the device receives a write command with a new
configuration setting, the device immediately begins a
new conversion and updates the conversion data.
FIGURE 5-2:
Timing Diagram For Writing To The MCP3421.
Start bit
Read/Write bit
Address Byte
R/W ACK
1
0
1
X
Device Code
Address Bits (Note 1)
Address
Acknowledge bit
Address
Note 1:
Specified by the customer and programmed at
the factory. If not specified by the customer,
programmed to ‘000’.
9
1
9
1
Stop Bit by
11
0
1A2 A1 A0
R/W
ACK by
MCP3421
RDY
C1 C0
O/C
S1 S0 G1 G0
1st Byte:
2nd Byte:
Master
ACK by
MCP3421
MCP3421 Address Byte
Configuration Byte
Start Bit by
Master
with Write command
Note:
– Stop bit can be issued any time during writing.
–
MCP3421 device code is 1101.
– Address Bits A2- A0 = 000 are programmed at factory unless customer requests different codes.
SCL
SDA
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