MCP3422A0-E/MF MICROCHIP [Microchip Technology], MCP3422A0-E/MF Datasheet

MCP3422A0-E/MF

Manufacturer Part Number

MCP3422A0-E/MF

Description

Manufacturer

MICROCHIP [Microchip Technology]

Datasheet

1.MCP3422A0-EMF.pdf (58 pages)

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Features

• 18-bit ΔΣ ADC with Differential Inputs:

• Differential Input Full Scale Range: -V

• Self Calibration of Internal Offset and Gain per

• On-Board Voltage Reference (V

• On-Board Programmable Gain Amplifier (PGA):

• INL: 10 ppm of Full Scale Range

• Programmable Data Rate Options:

• One-Shot or Continuous Conversion Options

• Low Current Consumption:

• On-Board Oscillator

• I

• Single Supply Operation: 2.7V to 5.5V

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

Typical Applications

• Portable Instrumentation and Consumer Goods

• Temperature Sensing with RTD, Thermistor, and

• Bridge Sensing for Pressure, Strain, and Force

• Weigh Scales

• Battery Fuel Gauges

• Factory Automation Equipment

- 2 channels: MCP3422 and MCP3423

- 4 channels: MCP3424

Each Conversion

- Accuracy: 2.048V ± 0.05%

- Drift: 15 ppm/°C

- Gains of 1, 2, 4 or 8

- 3.75 SPS (18 bits)

- 15 SPS (16 bits)

- 60 SPS (14 bits)

- 240 SPS (12 bits)

- 135 µA typical

- 36 µA typical

- Standard, Fast and High Speed Modes

- User configurable two external address pins

Thermocouple

18-Bit, Multi-Channel ΔΣ Analog-to-Digital Converter with

for MCP3423 and MCP3424

REF

™

Interface:

= 3V, Continuous Conversion)

= 3V, One-Shot Conversion with 1 SPS)

C™ Interface and On-Board Reference

REF

MCP3422/3/4

Description

The MCP3422, MCP3423 and MCP3424 devices

(MCP3422/3/4) are the low noise and high accuracy

18-Bit delta-sigma analog-to-digital (ΔΣ A/D) converter

family members of the MCP342X series from Microchip

Technology Inc. These devices can convert analog

inputs to digital codes with up to 18 bits of resolution.

The on-board 2.048V reference voltage enables an

input range of

range = 4.096V/PGA).

These devices can output analog-to-digital conversion

results at rates of 3.75, 15, 60, or 240 samples per

second

configuration bit settings using the two-wire I

interface.

calibrates offset and gain errors automatically. This

provides accurate conversion results from conversion

to conversion over variations in temperature and power

supply fluctuation.

The user can select the PGA gain of x1, x2, x4, or x8

before the analog-to-digital conversion takes place.

This allows the MCP3422/3/4 devices to convert a very

weak input signal with high resolution.

The MCP3422/3/4 devices have two conversion

modes: (a) One-Shot Conversion mode and (b)

Continuous Conversion mode. In One-Shot conversion

mode, the device performs a single conversion and

enters a low current standby mode automatically until it

receives another conversion command. This reduces

current consumption greatly during idle periods. In

Continuous conversion mode, the conversion takes

place continuously at the set conversion speed. The

device updates its output buffer with the most recent

conversion data.

The devices operate from a single 2.7V to 5.5V power

supply and have a two-wire I

interface for a standard (100 kHz), fast (400 kHz), or

high-speed (3.4 MHz) mode.

The I

are selected by using two external I

selection pins (Adr0 and Adr1). The user can configure

the device to one of eight available addresses by

connecting these two address selection pins to V

programmed at the factory during production.

or float. The I

C address bits for the MCP3423 and MCP3424

depending

During

C address bits of the MCP3422 are

2.048V differentially (full scale

each

conversion,

the

C compatible serial

user

DS22088C-page 1

the

controllable

C address

C serial

device

Related parts for MCP3422A0-E/MF

MCP3422A0-E/MF Summary of contents

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Multi-Channel ΔΣ Analog-to-Digital Converter with 2 I C™ Interface and On-Board Reference Features • 18-bit ΔΣ ADC with Differential Inputs channels: MCP3422 and MCP3423 - 4 channels: MCP3424 • Differential Input Full Scale Range REF ...

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MCP3422/3/4 The MCP3422 and MCP3423 devices have two differential input channels and the MCP3424 has four- differential input channels. All electrical properties of these three devices are the same except the differences in the number of input channels and I ...

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ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings† V ...................................................................................7.0V DD All inputs and outputs ............. ..........V –0. Differential Input Voltage ...................................... |V Output Short Circuit Current ................................ Continuous Current at Input Pins ....................................................±2 mA Current at Output and ...

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MCP3422/3/4 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, all parameters apply for T CHn+ = CHn / /2. All ppm units use 2*V REF INCOM REF Parameters Sym PGA Gain Error Match (Note 6) ...

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TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, Parameters Temperature Ranges Specified Temperature Range Operating Temperature Range Storage Temperature Range Thermal Package Resistances Thermal Resistance, 8L-DFN (2x3) Thermal Resistance, 8L-MSOP Thermal Resistance, 8L-SOIC Thermal Resistance, 10L-DFN (3x3) Thermal Resistance, 10L-MSOP Thermal ...

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TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or ...

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MCP3422/3/4 Note: Unless otherwise indicated -40°C to +85° /2. INCOM REF 200 180 V = 5.5V DD 160 140 120 V DD 100 -60 -40 -20 0 ...

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PIN DESCRIPTIONS The descriptions of the pins are listed in TABLE 3-1: PIN FUNCTION TABLE MCP3422 MCP3423 MSOP, DFN DFN MSOP SOIC ...

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MCP3422/3/4 CHn PIN EGEND V = Signal Source R = Source Impedance SS CHn = Analog Input Pin C = Input Pin Capacitance PIN V = Threshold Voltage T FIGURE 3-1: Equivalent Analog ...

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DESCRIPTION OF DEVICE OPERATION 4.1 General Overview The MCP3422/3/4 devices are differential multi- channel low-power, 18-Bit Delta-Sigma A/D converters 2 with serial interface. The devices contain an input channel selection multiplexer programmable gain amplifier (PGA), an ...

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MCP3422/3/4 4.5 Input Voltage Range The differential (V ) and common mode voltage the input pins without considering PGA INCOM setting are defined by CHn+ – CHn ...

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Digital Output Codes and Conversion to Real Values 4.9.1 DIGITAL OUTPUT CODE FROM DEVICE The digital output code is proportional to the input voltage and PGA settings. The output data format is a binary two’s complement. With this code ...

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MCP3422/3/4 4.9.2 CONVERTING THE DEVICE OUTPUT CODE TO INPUT SIGNAL VOLTAGE When the user gets the digital output codes from the device as described in Section 4.9.1 “Digital output code from device”, the next step is converting the digital output ...

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USING THE DEVICES 5.1 Operating Modes The user operates the device by setting up the device configuration register using a write (see Figure 5-3) and reads the conversion data using a read command (see Figure 5-4 and The device ...

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MCP3422/3/4 5.2 Configuration Register The device has an 8-bit wide configuration register to select for: input channel, conversion mode, conversion rate, and PGA gain. This register allows the user to change the operating condition of the device and check the ...

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If the configuration byte is read repeatedly by clocking continuously after reading the data bytes (i.e., after the 5th byte in the 18-bit conversion mode), the state of the RDY bit indicates whether the device is ready with new conversion ...

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MCP3422/3/4 Acknowledge bit Start bit Read/Write bit Address Address Byte Address Byte: Device Code Address Bits Note 1: MCP3423 and MCP3424: Configured by the user. See Table 5-3 for address bit configurations. 2: MCP3422: ...

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TABLE 5-3: ADDRESS BITS VS. ADDRESS SELECTION PINS FOR (MCP3423 AND MCP3424 ONLY) (NOTES Device Logic Status of Address Address Bits Selection Pins Adr0 Pin 0 (Addr_Low ...

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MCP3422/3/4 5.3.4 READING OUTPUT CODES AND CONFIGURATION BYTE FROM THE DEVICE When the Master sends a read command (R/W = 1), the device outputs both the conversion data and configuration bytes. Each byte consists of 8 bits with one acknowledge ...

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General Call The device acknowledges the general call address (0x00 in the first byte). The meaning of the general call address is always specified in the second byte. Refer to Figure 5-6. The device supports the following three general ...

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MCP3422/3/4 5.6.5 ACKNOWLEDGE AND NON- ACKNOWLEDGE The Master (microcontroller) and the slave (MCP3422/ 3/4) use an acknowledge pulse as a hand shake of communication for each byte. The ninth clock pulse of each byte is used for the acknowledgement. The ...

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TABLE 5- SERIAL TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise specified, all limits are specified for 0V, CHn+ = CHn /2. SS REF Parameters Sym Standard Mode (100 kHz) Clock frequency f SCL ...

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MCP3422/3/4 2 TABLE 5- SERIAL TIMING SPECIFICATIONS (CONTINUED) Electrical Specifications: Unless otherwise specified, all limits are specified for 0V, CHn+ = CHn /2. SS REF Parameters Sym High Speed Mode (3.4 MHz) Clock ...

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BASIC APPLICATION CONFIGURATION The MCP3422/3/4 devices can be used for various precision analog-to-digital converter These devices operate with very simple connections to the application circuit. The following sections discuss the examples of the device connections and applications. 6.1 Connecting ...

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MCP3422/3/4 6.1.4 DEVICE CONNECTION TEST The user can test the presence of the MCP3422/3 the I C bus line without performing an input data conversion. This test can be achieved by checking an acknowledge response from the MCP3422/3/4 ...

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Application Examples The MCP3422/3/4 devices can be used for broad ranges of sensor and data acquisition applications. Figure 6-5 shows a circuit example measuring both the battery voltage and current using the MCP3422 device. Channels 1 and 2 are ...

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MCP3422/3/4 Figure 6-6, shows an example MCP3424 for four-channel thermocouple temperature measurement applications. Thermocouple Sensor Isothermal Block MCP9800 SCL SDA MCP9800 Heat SCL SDA FIGURE 6-6: Four-Channel Thermocouple Applications. With Type K thermocouple, it temperature from 0°C to 1250°C degrees. ...

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Equation 6-2 shows an example of calculating the expected number of output code with various PGA gain settings for Type K thermocouple output. EQUATION 6-2: EXPECTED NUMBER OF OUTPUT CODE FOR TYPE K THERMOCOUPLE ⎛ Expected ⎜ ----------------------- ...

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MCP3422/3/4 EQUATION 6-3: EXPECTED NUMBER OF OUTPUT CODE FOR NPP301 PRESSURE SENSOR ⎛ Expected ⎜ 100 mV ----------------------- - log Number of Output Code = ⎜ 2 15.625 ⎝ ----------------------- - = 12.64 bits for PGA = 1 = 13.64 ...

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DEVELOPMENT TOOL SUPPORT 7.1 MCP3422/3/4 Evaluation Boards The Evaluation Boards for MCP3422/3/4 devices are available from Microchip Technology Inc. The boards work with Microchip’s PICkit™ Serial Analyzer. The user can simply connect any sensing voltage to the input test ...

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PACKAGING INFORMATION 8.1 Package Marking Information 8-Lead DFN (2x3) (MCP3422) XXX YWW NN 8-Lead MSOP (MCP3422) XXXXXX YWWNNN 8-Lead SOIC (300 mil) (MCP3422) XXXXXXXX XXXXXNNN YYWW Legend: XX...X Customer-specific information Y Year code (last digit of calendar year) YY ...

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MCP3422/3/4 Package Marking Information (Continued) 10-Lead DFN (3x3) (MCP3423 XXXX 2 9 XYWW 3 8 NNN 10-Lead MSOP (MCP3423) XXXXXX YWWNNN 14-Lead SOIC (150 mil) (MCP3424) XXXXXXXXXXX XXXXXXXXXXX YYWWNNN 14-Lead TSSOP (4.4 mm) (MCP3424) ...

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Microchip Technology Inc. MCP3422/3/4 DS22088C-page 41 ...

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Microchip Technology Inc. MCP3422/3/4 I φ DS22088C-page 43 ...

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Microchip Technology Inc. MCP3422/3/4 DS22088C-page 45 ...

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Microchip Technology Inc. MCP3422/3/4 DS22088C-page 47 ...

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Microchip Technology Inc. MCP3422/3/4 φ β α DS22088C-page 49 ...

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Microchip Technology Inc. MCP3422/3/4 I φ DS22088C-page 51 ...

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APPENDIX A: REVISION HISTORY Revision C (August 2009) The following is the list of modifications: 1. Updated the EDS protection parameters. 2. Updated the package marking information and package outline drawings. Revision B (October 2008) The following is the list ...

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... Default option. Contact Microchip factory for other address options. © 2009 Microchip Technology Inc. X /XX Examples: Package MCP3422 a) MCP3422A0-E/MC: 2-Channel ADC, b) MCP3422A0T-E/MC: Tape and Reel, c) MCP3422A0-E/MS: 2-Channel ADC, d) MCP3422A0T-E/MS: Tape and Reel, e) MCP3422A0-E/SN: 2-Channel ADC, f) MCP3422A0T-E/SN: Tape and Reel, MCP3423 a) MCP3423-E/MF: b) MCP3423T-E/MF ...

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Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families ...

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W ORLDWIDE AMERICAS ASIA/PACIFIC Corporate Office Asia Pacific Office 2355 West Chandler Blvd. Suites 3707-14, 37th Floor Chandler, AZ 85224-6199 Tower 6, The Gateway Tel: 480-792-7200 Harbour City, Kowloon Fax: 480-792-7277 Hong Kong Technical Support: Tel: 852-2401-1200 http://support.microchip.com Fax: 852-2401-3431 ...

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