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參數資料
| 型號： | MCP3421A5T-E/OT |
| 廠商： | Microchip Technology |
| 文件頁數： | 8/30頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 18BIT 3.75SPS SOT23-6 |
| 標準包裝： | 1 |
| 位數： | 18 |
| 采樣率（每秒）： | 3.75 |
| 數據接口： | I²C，串行 |
| 轉換器數目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應商設備封裝： | SOT-23-6 |
| 包裝： | 標準包裝 |
| 輸入數目和類型： | 2 個單端，雙極；1 個差分，單極 |
| 配用： | MCP3421EV-ND - BOARD EVAL FOR MCP3421 SOT23-6 |
| 其它名稱： | MCP3421A5T-E/OTDKR |
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MCP3421
DS22003B-page 16
2006 Microchip Technology Inc.
FIGURE 5-4:
Timing Diagram For Writing To The MCP3421.
5.4
General Call
The MCP3421 acknowledges the general call address
(0x00 in the first byte). The meaning of the general call
address is always specified in the second byte. Refer
to Figure 5-5. The MCP3421 supports the following
general calls:
5.4.1
GENERAL CALL RESET
The general call reset occurs if the second byte is
‘00000110’ (06h). At the acknowledgement of this
byte, the device will abort current conversion and
perform an internal reset similar to a power-on-reset
(POR).
5.4.2
GENERAL CALL CONVERSION
The general call conversion occurs if the second byte
is ‘00001000’ (08h). All devices on the bus initiate a
conversion simultaneously. For the MCP3421 device,
the configuration will be set to the One-Shot Conver-
sion mode and a single conversion will be performed.
The PGA and data rate settings are unchanged with
this general call.
FIGURE 5-5:
General Call Address
Format.
For more information on the general call, or other I2C
modes, please refer to the Phillips I2C specification.
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
Note:
The I2C specification does not allow to use
“00000000” (00h) in the second byte.
LSB
First Byte
ACK
x
0 0 0 0 0 0 0 0 A
A
xx x x x x x
(General Call Address)
Second Byte
ACK
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