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參數資料
| 型號： | MCP3421DM-WS |
| 廠商： | Microchip Technology |
| 文件頁數： | 1/42頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DEMO MCP3421 WEIGHT SCALE |
| 標準包裝： | 1 |
| 主要目的： | 參考設計，稱量臺 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP3421，MCP6V07，PIC18F4550 |
| 主要屬性： | 2Kg測壓元件，靈敏度為1 mV/V |
| 已供物品： | 板，線纜，CD，電源 |
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2009 Microchip Technology Inc.
DS22003E-page 1
MCP3421
Features
18-bit
ΔΣ ADC in a SOT-23-6 package
Differential Input Operation
Self Calibration of Internal Offset and Gain Per
Each Conversion
On-Board Voltage Reference:
- Accuracy: 2.048V ± 0.05%
- Drift: 15 ppm/°C
On-Board Programmable Gain Amplifier (PGA):
- Gains of 1,2, 4 or 8
On-Board Oscillator
INL: 10 ppm of FSR (FSR = 4.096V/PGA)
Programmable Data Rate Options:
- 3.75 SPS (18 bits)
- 15 SPS (16 bits)
- 60 SPS (14 bits)
- 240 SPS (12 bits)
One-Shot or Continuous Conversion Options
Low Current Consumption:
- 145 A typical
(VDD= 3V, Continuous Conversion)
- 39 A typical
(VDD= 3V, One-Shot Conversion with 1 SPS)
Supports I2C Serial Interface:
- Standard, Fast and High Speed Modes
Single Supply Operation: 2.7V to 5.5V
Extended Temperature Range: -40°C to +125°C
Typical Applications
Portable Instrumentation
Weigh Scales and Fuel Gauges
Temperature Sensing with RTD, Thermistor, and
Thermocouple
Bridge Sensing for Pressure, Strain, and Force.
Package Types
Description
The MCP3421 is a single channel low-noise, high
accuracy
ΔΣ A/D converter with differential inputs and
up to 18 bits of resolution in a small SOT-23-6 package.
The on-board precision 2.048V reference voltage
enables an input range of ±2.048V differentially
(
Δ voltage = 4.096V). The device uses a two-wire I2C
compatible serial interface and operates from a single
2.7V to 5.5V power supply.
The MCP3421 device performs conversion at rates of
3.75, 15, 60, or 240 samples per second (SPS)
depending on the user controllable configuration bit
settings using the two-wire I2C serial interface. This
device has an on-board programmable gain amplifier
(PGA). The user can select the PGA gain of x1, x2, x4,
or x8 before the analog-to-digital conversion takes
place. This allows the MCP3421 device to convert a
smaller input signal with high resolution. The device
has two conversion modes: (a) Continuous mode and
(b) One-Shot mode. In One-Shot mode, the device
enters a low current standby mode automatically after
one conversion. This reduces current consumption
greatly during idle periods.
The MCP3421 device can be used for various high
accuracy analog-to-digital data conversion applications
where design simplicity, low power, and small footprint
are major considerations.
Block Diagram
1
2
3
4
5
6
VIN+
VSS
SCL
VIN-
VDD
SDA
MCP3421
SOT-23-6
VSS
VDD
VIN+
VIN-
SCL
SDA
Voltage Reference
Clock
(2.048V)
I2C Interface
Gain = 1, 2, 4, or 8
VREF
ΔΣ ADC
Converter
PGA
Oscillator
18-Bit Analog-to-Digital Converter
with I2C Interface and On-Board Reference
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