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| 型号： | MCP3421A5T-E/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 2/30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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MCP3421
DS22003B-page 10
2006 Microchip Technology Inc.
5.0
USING THE MCP3421 DEVICE
5.1
Operating Modes
The user operates the device by setting up the device
configuration register and reads the conversion data
using serial I2C interface commands. The MCP3421
operates in two modes: (a) Continuous Conversion
Mode or (b) One-Shot Conversion Mode (single
conversion). The selection is made by setting the O/C
bit in the Configuration Register. Refer to Section 5.2
“Configuration Register” for more information.
5.1.1
CONTINUOUS CONVERSION
MODE (O/C BIT = 1)
The MCP3421 device performs a Continuous
Conversion if the O/C bit is set to logic “high”. Once the
conversion is completed, the result is placed at the
output data register. The device immediately begins
another conversion and overwrites the output data
register with the most recent data.
The device also clears the data ready flag (RDY bit = 0)
when the conversion is completed. The device sets the
ready flag bit (RDY bit = 1), if the latest conversion
result has been read by the Master.
5.1.2
ONE-SHOT CONVERSION MODE
(O/C BIT = 0)
Once the One-Shot Conversion (single conversion)
Mode is selected, the device performs a conversion,
updates the Output Data register, clears the data ready
flag (RDY = 0), and then enters a low power standby
mode. A new One-Shot Conversion is started again
when the device receives a new write command with
RDY = 1.
This One-Shot Conversion Mode is recommended for
low power operating applications. During the low
current standby mode, the device consumes less than
1 A typical. For example, if user collects 18 bit
conversion data once a second in One-Shot Conver-
sion mode, the device draws only about one fourth of
its total operating current. In this example, the device
consumes approximately 39 A (= ~145 A/3.75 SPS),
if the device performs only one conversion per second
(1 SPS) in 18-bit conversion mode with 3V power
supply.
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