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MCP3426/7/8

Features

• 16-bit ΔΣ ADC with Differential Inputs:

- 2 channels: MCP3426 and MCP3427

- 4 channels: MCP3428

• Differential Input Full Scale Range: -V

REF

• Self Calibration of Internal Offset and Gain per

Each Conversion

• On-Board Voltage Reference (V

REF

- Accuracy: 2.048V ± 0.05%

- Drift: 15 ppm/°C

• On-Board Programmable Gain Amplifier (PGA):

- Gains of 1,2, 4 or 8

• INL: 10 ppm of Full Scale Range

• Programmable Data Rate Options:

- 15 SPS (16 bits)

- 60 SPS (14 bits)

- 240 SPS (12 bits)

• One-Shot or Continuous Conversion Options

• Low Current Consumption (V

= 3V):

- Continuous Conversion: 135 µA typical

- One-Shot Conversion with 1 SPS:

- 9 µA typical for 16 bit mode

- 2.25 µA typical for 14 bit mode

- 0.56 µA typical for 12 bit mode

• On-Board Oscillator

•I

™

Interface:

- Standard, Fast and High Speed Modes

- User configurable two external address

selection pins for MCP3427 and MCP3428

• 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

Thermocouple

• Bridge Sensing for Pressure, Strain, and Force

• Weigh Scales and Battery Fuel Gauges

• Factory Automation Equipment

Description

The MCP3426, MCP3427 and MCP3428 devices

(MCP3426/7/8) are the low noise and high accuracy

16 Bit Delta-Sigma Analog-to-Digital (ΔΣ A/D) Con-

verter family members of the MCP342X series from

Microchip Technology Inc. These devices can convert

analog inputs to digital codes with up to 16 bits of reso-

lution.

The MCP3426 and MCP3427 devices have two

differential input channels and the MCP3428 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

address bit selection options.

These devices can output analog-to-digital conversion

results at rates of 15 (16-bit mode), 60 (14-bit mode), or

240 (12-bit mode) samples per second depending on

the user controllable configuration bit settings using the

two-wire I

C serial interface. During each conversion,

the device calibrates offset and gain errors

automatically. This provides accurate conversion

results from conversion to conversion over variations in

temperature and power supply fluctuation.

The device has an on-board 2.048V reference voltage,

which enables an input range of ± 2.048V differentially

(full scale range = 4.096/PGA).

The user can select the gain of the on-board

programmable gain amplifier (PGA) using the

configuration register bits (gain of x1, x2, x4, or x8).

This allows the MCP3426/7/8 devices to convert a very

weak input signal with high resolution.

The MCP3426/7/8 devices have two conversion

modes: (a) One-Shot Conversion mode and

(b) Continuous Conversion mode. In the One-Shot

conversion mode, the device performs a single

conversion and enters a low current standby

(shutdown) 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 configured 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

C compatible serial

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

high-speed (3.4 MHz) mode.

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

C™ Interface and On-Board Reference

Summary of content (56 pages)

PAGE 1
MCP3426/7/8 16-Bit, Multi-Channel ΔΣ Analog-to-Digital Converter with I2C™ Interface and On-Board Reference Features Description • 16-bit ΔΣ ADC with Differential Inputs: - 2 channels: MCP3426 and MCP3427 - 4 channels: MCP3428 • Differential Input Full Scale Range: -VREF to +VREF • Self Calibration of Internal Offset and Gain per Each Conversion • On-Board Voltage Reference (VREF): - Accuracy: 2.048V ± 0.
PAGE 2
MCP3426/7/8 The I2C address bits for the MCP3427 and MCP3428 are selected by using two external I2C address 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 VDD, VSS or float. The I2C address bits of the MCP3426 are programmed at the factory during production. The MCP3426 is available in 8-pin SOIC, DFN, and MSOP packages. The MCP3427 is available in 10-pin DFN, and MSOP packages.
PAGE 3
MCP3426/7/8 MCP3427 Functional Block Diagram VSS VDD MCP3427 Adr1 Voltage Reference (2.048V) Adr0 VREF CH1CH2+ MUX CH1+ CH2- ΔΣ ADC Converter PGA I2C SCL Interface SDA Gain = 1, 2, 4, or 8 Clock Oscillator MCP3428 Functional Block Diagram VSS VDD MCP3428 CH1+ Adr1 Voltage Reference (2.048V) CH1- Adr0 VREF CH2- MUX CH2+ PGA ΔΣ ADC Converter CH3+ CH3CH4+ I2C Interface SCL SDA Gain = 1, 2, 4, or 8 Clock Oscillator CH4- © 2009 Microchip Technology Inc.
PAGE 5
MCP3426/7/8 1.0 ELECTRICAL CHARACTERISTICS †Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings† VDD.......................................................
PAGE 6
MCP3426/7/8 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V, CHn+ = CHn- = VREF/2, VINCOM = VREF /2. All ppm units use 2*VREF as differential full scale range. Parameters Offset Error Sym Min Typ Max Units VOS — 30 — µV Conditions PGA = 1 DR = 15 SPS Offset Drift vs.
PAGE 7
MCP3426/7/8 TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, TA = -40°C to +125°C, VDD = +5.0V, VSS = 0V. Parameters Sym Min Typ Max Units Specified Temperature Range TA -40 — +85 °C Operating Temperature Range TA -40 — +125 °C Storage Temperature Range TA -65 — +150 °C Thermal Resistance, 8L-DFN (2x3) θJA — 84.5 — °C/W Thermal Resistance, 8L-MSOP θJA — 211 — °C/W Thermal Resistance, 8L-SOIC θJA — 149.
PAGE 9
MCP3426/7/8 2.0 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 guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 0.
PAGE 10
MCP3426/7/8 Note: Unless otherwise indicated, TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V, CHn+ = CHn- = VREF/2, VINCOM = VREF/2. 5 180 V DD = 5.5V IDDA (µA) 160 140 120 VDD = 2.7V 100 V DD = 5.0V 80 Oscillator Drift (%) 200 60 4 3 2 VDD = 2.7V 1 0 VDD = 5.0V -1 -60 -40 -20 0 20 40 60 80 100 120 140 -60 -40 -20 0 Temperature (°C) IDDA vs. Temperature. 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 VDD = 5.5V VDD = 5.0V VDD = 2.7V -60 -40 -20 0 20 40 60 FIGURE 2-10: Temperature.
PAGE 11
MCP3426/7/8 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1.
PAGE 12
MCP3426/7/8 VDD RSS D1 VT = 0.6V CPIN D 2 4 pF VT = 0.6V CHn V Sampling Switch SS ILEAKAGE (~ ±1 nA) RS CSAMPLE (3.2 pF) VSS LEGEND V Rss CHn CPIN VT FIGURE 3-1: 3.3 = = = = = Signal Source Source Impedance Analog Input Pin Input Pin Capacitance Threshold Voltage ILEAKAGE SS Rs CSAMPLE D1, D2 = = = = = Leakage Current at Analog Pin Sampling Switch Sampling Switch Resistor Sample Capacitance ESD Protection Diode Equivalent Analog Input Circuit.
PAGE 13
MCP3426/7/8 4.0 DESCRIPTION OF DEVICE OPERATION 4.1 General Overview The MCP3426/7/8 devices are differential multi-channel low-power, 16-Bit Delta-Sigma A/D converters with an I2C serial interface. The devices contain an input channel selection multiplexer (mux), a programmable gain amplifier (PGA), an on-board voltage reference (2.048V), and an internal oscillator. When the device powers up (POR is set), it automatically resets the configuration bits to default settings. 4.1.
PAGE 14
MCP3426/7/8 4.5 Input Voltage Range The differential (VIN) and common mode voltage (VINCOM) at the input pins without considering PGA setting are defined by: V IN = ( CHn+ ) – ( CHn- ) CHn+ ) + ( CHn- )V INCOM = (---------------------------------------------2 Where: n = nth input channel (n=1, 2, 3, or 4) The input signal levels are amplified by the internal programmable gain amplifier (PGA) at the front end of the ΔΣ modulator.
PAGE 15
MCP3426/7/8 4.9 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 scheme, the MSB can be considered a sign indicator. When the MSB is a logic ‘0’, the input is positive. When the MSB is a logic ‘1’, the input is negative.
PAGE 16
MCP3426/7/8 4.9.2 CONVERTING THE DEVICE OUTPUT CODE TO INPUT SIGNAL VOLTAGE EQUATION 4-4: CONVERTING OUTPUT CODES TO INPUT 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 codes to a measured input voltage. Equation 4-4 shows an example of converting the output codes to its corresponding input voltage.
PAGE 17
MCP3426/7/8 5.0 5.1 USING THE DEVICES Operating Modes The user operates the device by setting up the device configuration register using a write command (see Figure 5-3) and reads the conversion data using a read command (see Figure 5-4 ). The device operates in two modes: (a) Continuous Conversion Mode or (b) One-Shot Conversion Mode (single conversion). This mode selection is made by setting the O/C bit in the Configuration Register. Refer to Section 5.2 “Configuration Register” for more information.
PAGE 18
MCP3426/7/8 5.2 Configuration Register The user can rewrite the configuration byte any time during the device operation. Register 5-1 shows the configuration register bits. 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 status of the device operation.
PAGE 19
MCP3426/7/8 If the configuration byte is read repeatedly by clocking continuously after reading the data bytes (i.e., after the 4th byte in the 16-bit conversion mode), the state of the RDY bit indicates whether the device is ready with new conversion result. When the Master finds the RDY bit is cleared, it can send a not-acknowledge (NAK) bit and a stop bit to exit the current read operation and send a new read command for the latest conversion data.
PAGE 20
MCP3426/7/8 Acknowledge bit Start bit Read/Write bit R/W ACK Address It is recommended to issue a General Call Reset or General Call Latch command once after the device has powered up. This will ensure that the device reads the address pins in a stable condition, and avoid latching the address bits while the power supply is ramping up. This might cause inaccurate address pin detection.
PAGE 21
MCP3426/7/8 TABLE 5-3: I2C Device Address Bits A1 A0 Adr0 Pin Adr1 Pin 0 0 0 0 (Addr_Low) 0 (Addr_Low) 0 0 1 0 (Addr_Low) Float 0 1 0 0 (Addr_Low) 1 (Addr_High) 1 0 0 1 (Addr_High) 0 (Addr_Low) 1 0 1 1 (Addr_High) Float 1 1 0 1 (Addr_High) 1 (Addr_High) 0 1 1 Float 0 (Addr_Low) 1 1 1 Float 1 (Addr_High) 0 0 0 Float Float 2: 3: WRITING A CONFIGURATION BYTE TO THE DEVICE When the Master sends an address byte with the R/W bit low (R/W = 0), the device expect
PAGE 22
MCP3426/7/8 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 (ACK) bit. The ACK bit after the address byte is issued by the device and the ACK bits after each conversion data bytes are issued by the Master. When the device receives a read command, it outputs two data bytes followed by a configuration register.
PAGE 23
FIGURE 5-4: © 2009 Microchip Technology Inc. Note: Start Bit by Master SDA SCL 0 1 R/W A2 A1 A0 1st Byte MCP3426/7/8 Address Byte 1 D 15 1 D 12 D 11 D 10 2nd Byte Upper Data Byte D D 14 13 ACK by MCP3426/7/8 9 D 9 D 8 D 7 1 1 ACK by Master 9 RDY C 1 D 6 – MCP3426/7/8 device code is 1101. – See Figure 5-1 for details in Address Byte. – Stop bit or NAK bit can be issued at the end of each output byte. – In 14 - bit mode: D15 and D14 are repeated MSB and can be ignored.
PAGE 24
MCP3426/7/8 5.4 General Call 5.5 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 5-5. The device supports the following three general calls. For more information on the general call, or other I2C modes, refer to the Phillips I2C specification. 5.4.1 GENERAL CALL RESET The general call reset occurs if the second byte is ‘00000110’ (06h).
PAGE 25
MCP3426/7/8 5.6.5 ACKNOWLEDGE AND NON-ACKNOWLEDGE The Master (microcontroller) and the slave (MCP3426/ 7/8) use an acknowledge pulse (ACK) as a hand shake of communication for each byte. The ninth clock pulse of each byte is used for the acknowledgement. The clock pulse is always provided by the Master (microcontroller) and the acknowledgement is issued by the receiving device of the byte (Note: The transmitting device must release the SDA line during the acknowledge pulse.).
PAGE 26
MCP3426/7/8 TABLE 5-5: I2C SERIAL TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise specified, all limits are specified for TA = -40 to +85°C, VDD = +2.7V to +5.0V, VSS = 0V, CHn+ = CHn- = VREF/2.
PAGE 27
MCP3426/7/8 TABLE 5-5: I2C SERIAL TIMING SPECIFICATIONS (CONTINUED) Electrical Specifications: Unless otherwise specified, all limits are specified for TA = -40 to +85°C, VDD = +2.7V to +5.0V, VSS = 0V, CHn+ = CHn- = VREF/2. Parameters Sym Min Typ Max Units Conditions High Speed Mode (3.4 MHz) Clock frequency fSCL 0 — 3.4 MHz Cb = 100 pF 0 — 1.7 MHz Cb = 400 pF — — ns Clock high time THIGH 60 120 — — ns Cb = 400 pF, fSCL = 1.
PAGE 28
MCP3426/7/8 TF SCL TSU:STA TLOW SDA TR THIGH TSP THD:STA TSU:DAT THD:DAT TSU:STO TBUF 0.7VDD 0.3VDD TAA FIGURE 5-7: DS22226A-page 28 I2C Bus Timing Data. © 2009 Microchip Technology Inc.
PAGE 29
MCP3426/7/8 6.0 BASIC APPLICATION CONFIGURATION The MCP3426/7/8 devices can be used for various precision analog-to-digital converter applications. 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 6.1.1 Connecting to the Application Circuits The user can tie the Adr0 and Adr1 pins to VSS, VDD, or left floating. See more details in Section 5.3.
PAGE 30
MCP3426/7/8 6.1.4 DEVICE CONNECTION TEST 6.1.5 The user can test the presence of the MCP3426/7/8 on the I2C bus line without performing an input data conversion. This test can be achieved by checking an acknowledge response from the MCP3426/7/8 after sending a read or write command. Here is an example using Figure 6-3: a. b. c. Set the R/W bit “HIGH” in the address byte. Check the ACK pulse after sending the address byte.
PAGE 31
MCP3426/7/8 6.2 Application Examples Therefore, the current measurement often prefers to use a current sensor with smaller resistance value, which, in turn, requires high resolution ADC device. The MCP3426/7/8 devices can be used for broad ranges of sensor and data acquisition applications. The device can measure the input voltage as low as 7.8 µV range (or current in ~ µA range) with 16 bit resolution and PGA = 8 settings.
PAGE 32
MCP3426/7/8 Figure 6-6, shows an example of using the MCP3428 for four-channel thermocouple temperature measurement applications. Thermocouple Sensor Isothermal Block Isothermal Block MCP9800 MCP3428 MCP9800 SCL SDA 0.1 µF 1 2 3 4 5 6 7 CH1+ CH1CH2+ CH2VSS VDD SDA CH4- 14 13 12 11 CH4+ CH3CH3+ Adr1 Adr0 SCL SDA SCL 10 9 8 VDD MCP9800 MCP9800 10 µF SDA Heat SCL SCL SCL SDA TO MCU (MASTER) SDA 5 kΩ FIGURE 6-6: VDD Four-Channel Thermocouple Applications.
PAGE 33
MCP3426/7/8 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 Number of Output Code = = ⎛ ⎞ 50 mV log 2 ⎜ ------------------⎟ ⎜ 62.5μV⎟ ⎝ ------------------⎠ PGA ln ( 800 • PGA -)⎞ ⎛ -----------------------------------⎝ ⎠ ln ( 2 ) = 9.6 bits for PGA = 1 = 10.6 bits for PGA = 2 = 11.6 bits for PGA = 4 = 12.
PAGE 34
MCP3426/7/8 Figure 6-7 shows an example of measuring both pressure and temperature. The pressure is measured by using NPP 301 (manufactured by GE NovaSensor), and temperature is measured by a thermistor. The pressure sensor output is 20 mV/V. This gives 100 mV of full scale output for VDD of 5V (sensor excitation voltage). Equation 6-3 shows an example of calculating the number of output code for the full scale output of the NPP301.
PAGE 35
MCP3426/7/8 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 8-Lead DFN (2x3) (MCP3426) XXX YWW NN Example: ABX 945 25 8-Lead MSOP (MCP3426) Example: XXXXXX 3426A0 YWWNNN 945256 8-Lead SOIC (300 mil) (MCP3426) XXXXXXXX XXXXYYWW NNN Legend: XX...
PAGE 36
MCP3426/7/8 Package Marking Information (Continued) 10-Lead DFN (3x3) (MCP3427) 1 10 1 9 2 8 3 7 4 6 5 XXXX YYWW NNN 2 3 4 5 10-Lead MSOP (MCP3427) XXXXXX YWWNNN 14-Lead SOIC (150 mil) (MCP3428) XXXXXXXXXXX XXXXXXXXXXX YYWWNNN 14-Lead TSSOP (4.4 mm) (MCP3428) XXXXXXXX DS22226A-page 36 Example: 10 3427 0945 256 9 8 7 6 Example: 3427E 945256 Example: MCP3428 e3 E/SL^^ 0945256 Example: MCP3428E YYWW 0945 NNN 256 © 2009 Microchip Technology Inc.
PAGE 37
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PAGE 38
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PAGE 39
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PAGE 40
MCP3426/7/8 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22226A-page 40 © 2009 Microchip Technology Inc.
PAGE 41
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PAGE 43
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PAGE 44
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PAGE 45
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PAGE 46
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PAGE 48
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PAGE 49
MCP3426/7/8 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging © 2009 Microchip Technology Inc.
PAGE 51
MCP3426/7/8 APPENDIX A: REVISION HISTORY Revision A (December 2009) • Original Release of this Document. © 2009 Microchip Technology Inc.
PAGE 53
MCP3426/7/8 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO.
PAGE 55
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 of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 56
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