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| 型号： | MCP3421A5T-E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 3/30页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 3.75SPS SOT23-6 |
| 标准包装： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 3.75 |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，单极 |
| 配用： | MCP3421EV-ND - BOARD EVAL FOR MCP3421 SOT23-6 |
| 其它名称： | 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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