Microchip Technology TMPSNSRD-TCPL1 데이터 시트

© 2009 Microchip Technology Inc.

DS22003E-page 1

• 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 µA typical 

(V

DD

= 3V, Continuous Conversion)

- 39 µA typical

(V

DD

= 3V, One-Shot Conversion with 1 SPS)

• Supports I

2

C Serial Interface:

- Standard, Fast and High Speed Modes

• Single Supply Operation: 2.7V to 5.5V

• Extended Temperature Range: -40°C to +125°C

• Portable Instrumentation

• Weigh Scales and Fuel Gauges

• Temperature Sensing with RTD, Thermistor, and 

Thermocouple

• Bridge Sensing for Pressure, Strain, and Force.

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 I

2

C

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 I

2

C 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.

1

2

3

4

5

6

V

IN

+

 

V

SS

SCL

V

IN

-

V

DD

SDA

V

SS

V

DD

V

IN

+

V

IN

-

SCL

SDA

Voltage Reference

Clock

(2.048V)

I

2

C Interface

Gain = 1, 2, 4, or 8

V

REF

ΔΣ ADC

Converter

PGA

Oscillator