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參數(shù)資料
| 型號： | MCP3421A5T-E/OT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 3/30頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 3.75SPS SOT23-6 |
| 標準包裝： | 1 |
| 位數(shù)： | 18 |
| 采樣率（每秒）： | 3.75 |
| 數(shù)據接口： | I²C，串行 |
| 轉換器數(shù)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(shù)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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2006 Microchip Technology Inc.
DS22003B-page 11
MCP3421
5.2
Configuration Register
The MCP3421 has an 8-bit wide configuration register
to select for: PGA gain, conversion rate, and conver-
sion mode. This register allows the user to change the
operating condition of the device and check the status
of the device operation. The user can rewrite the
configuration byte any time during the device
operation. Register 5-1 shows the configuration
register bits.
REGISTER 5-1:
CONFIGURATION REGISTER
R/W-1
R/W-0
R/W-1
R/W-0
RDY
C1
C0
O/C
S1
S0
G1
G0
1 *
0 *
1 *
0 *
bit 7
bit 0
* Default Configuration after Power-On Reset
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
RDY: Ready Bit
This bit is the data ready flag. In read mode, this bit indicates if the output register has been updated
with a new conversion. In One-Shot Conversion mode, writing this bit to “1” initiates a new conversion.
Reading RDY bit with the read command:
1 = Output register has not been updated.
0 = Output register has been updated with the latest conversion data.
Writing RDY bit with the write command:
Continuous Conversion mode: No effect
One-Shot Conversion mode:
1 = Initiate a new conversion.
0 = No effect.
bit 6-5
C1-C0: Channel Selection Bits
These are the Channel Selection bits, but not used in the MCP3421 device.
bit 4
O/C: Conversion Mode Bit
1 = Continuous Conversion Mode. Once this bit is selected, the device performs data conversions
continuously.
0 = One-Shot Conversion Mode. The device performs a single conversion and enters a low power
standby mode until it receives another write/read command.
bit 3-2
S1-S0: Sample Rate Selection Bit
00 =
240 SPS (12 bits),
01 =
60 SPS (14 bits),
10 =
15 SPS (16 bits),
11 =
3.75 SPS (18 bits)
bit 1-0
G1-G0: PGA Gain Selector Bits
00 =
1 V/V,
01 =
2 V/V,
10 =
4 V/V,
11 =
8 V/V
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