MCP3422A1-E/MS Microchip Technology, MCP3422A1-E/MS Datasheet

MCP3422A1-E/MS

Manufacturer Part Number

MCP3422A1-E/MS

Description

18-Bit, Multi-Channel Delta-Sigma ADC w/ I2C Interface and On-Board Reference ; 8L MSOP 3x3mm

Manufacturer

Microchip Technology

Datasheet

1.MCP3422A1-EMS.pdf (56 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

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

- 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

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 depending on the user controllable configura-

tion bit settings using the two-wire I

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 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) Contin-

uous 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

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

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

high-speed (3.4 MHz) mode.

The I

are selected by using two external I

tion pins (Adr0 and Adr1). The user can configure the

device to one of eight available addresses by connect-

ing these two address selection pins to V

float. The I

grammed at the factory during production.

C address bits for the MCP3423 and MCP3424

C address bits of the MCP3422 are pro-

mode,

2.048V differentially (full-scale

the

conversion

C compatible serial inter-

C serial interface.

C address selec-

DS22088B-page 1

takes

, V

place

Related parts for MCP3422A1-E/MS

MCP3422A1-E/MS Summary of contents

Page 1

... Thermocouple • Bridge Sensing for Pressure, Strain, and Force • Weigh Scales • Battery Fuel Gauges • Factory Automation Equipment © 2008 Microchip Technology Inc. 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 (Δ ...

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... DD SS Voltage Reference (2.048V) V REF 2 ΔΣ ADC I PGA Converter Interface Clock Oscillator SOIC, TSSOP CH4 CH1 CH4 CH3- CH2 CH3 Adr1 Adr0 9 DD SDA SCL 7 8 SCL C SDA © 2008 Microchip Technology Inc. ...

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... Functional Block Diagram MCP3423 CH1+ CH1- CH2+ CH2- Gain = 1,2, Functional Block Diagram CH1+ CH1- CH2+ CH2- CH3+ CH3- Gain = 1,2, CH4+ CH4- © 2008 Microchip Technology Inc Voltage Reference (2.048V) V REF ΔΣ ADC PGA Converter Interface Clock Oscillator V V ...

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... Addr_Float voltage is applied at address pin. 10: No voltage is applied at address pin (left “floating”). © 2008 Microchip Technology Inc. †Notice: Stresses above those listed under “Maximum Rat- ings” 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 ...

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... V = GND IL V The device reads logic low. V The device reads logic high. V Read pin voltage if voltage is applied to the address pin. (Note 9) Device outputs float output voltage (V /2) on the address DD pin, if left “floating”. (Note 10 © 2008 Microchip Technology Inc. ...

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... 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 Resistance, 14L-SOIC Thermal Resistance, 14L-TSSOP © 2008 Microchip Technology Inc -40°C to +125° Sym Min Typ Max ...

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... PGA = 8 5 PGA = -10 PGA = 2 -15 -20 -60 -40 - 100 120 140 Temperature (°C) FIGURE 2-3: Offset Error vs. Temperature. © 2008 Microchip Technology Inc. = +5.0V 0V, CHn+ = CHn +25° PGA = 5.5 -100 -75 FIGURE 2-4: Voltage ...

Page 10

... Temperature. 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 V = 2.7V DD -110 -120 0.1 0.1 FIGURE 2-11: /2, REF 100 120 140 Temperature (°C) Oscillator Drift vs. Data Rate = 3.75 SPS 1 10 100 1000 10000 1 10 100 1k 10k Input Signal Frequency (Hz) Frequency Response. © 2008 Microchip Technology Inc. ...

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... C is the package pin capacitance and PIN typically about 4 pF. D and D are the ESD diodes the differential input sampling capacitor. SAMPLE © 2008 Microchip Technology Inc. Table 3-1. MCP3424 Sym SOIC, TSSOP 1 CH1+ Positive Differential Analog Input Pin of Channel 1 2 ...

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... Exposed Thermal Pad (EP) and the V be connected to the same potential on the Printed Circuit Board (PCB). Sampling Switch SAMPLE (3.2 pF interface. The SDA line to the SDA pin Serial Communications” Serial Interface communication. pin; they must SS © 2008 Microchip Technology Inc. ...

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... A 0.1 µF decoupling capacitor should be mounted as close as possible to the V for additional transient immunity. © 2008 Microchip Technology Inc. MCP3422/3/4 The threshold voltage is set at 2.2V with a tolerance of approximately ±5%. If the supply voltage falls below this threshold, the device will be held in a reset condition ...

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... Self-Calibration The device performs a self-calibration of offset and gain for each conversion. This provides reliable conversion results from conversion-to-conversion over variations in temperature as well as power supply fluctuations. Ω Z (f) = 2.25 M /PGA IN 2-11) may not give enough © 2008 Microchip Technology Inc. ...

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... Where Resolution, which is programmed in the Configuration Register. © 2008 Microchip Technology Inc. Table 4-1 shows the LSB size of each conversion rate setting. The measured unknown input voltage is obtained by multiplying the output codes with LSB. See the following section for the input voltage calculation using the output codes ...

Page 16

... LSB(15.625μV)/PGA = - 31.25 (μV)for PGA = -(2 +0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x LSB(15.625μV)/PGA = - 2.048 (V) for PGA = -(2 +0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x LSB(15.625μV)/PGA = - 2.048 (V) for PGA = 1 © 2008 Microchip Technology Inc. LSB • ----------- - PGA LSB • ----------- - PGA See Table 4-1 1’s complement + ...

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... RDY bit = 1 means the conversion result is not updated since the last reading. A new conversion is under processing and the RDY bit will be cleared when the new conversion result is ready. © 2008 Microchip Technology Inc. 5.1.2 ONE-SHOT CONVERSION MODE (O/C BIT = Once the One-Shot Conversion (single conversion) ...

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... The user can rewrite the configuration byte any time during the device operation. configuration register bits. R/W-1 R/W-0 R/W-0 O Unimplemented bit, read as ‘0’ ‘0’ = Bit is cleared Register 5-1 shows the R/W-0 R/W bit Bit is unknown © 2008 Microchip Technology Inc. ...

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... The conversion result in Continu- ous Conversion mode was already read. The next new con- version data is not ready. The RDY bit stays high until a new conversion is completed. © 2008 Microchip Technology Inc Serial Communications The device communicates with Master (microcontrol- ...

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... The device latches the floating condition immediately ) after the General Call Latch command Float waveform (output) at address pin Table 5-3 SCL SDA FIGURE 5-2: Command and Voltage Output at Address Pin Left “Floating” (MCP3423 and MCP3424). General Call Latch © 2008 Microchip Technology Inc. ...

Page 21

... MCP3422/3/4 device code is 1101 (programmed at the factory). – See Figure 5-1 for details in Address Byte. FIGURE 5-3: Timing Diagram For Writing To The MCP3422/3/4. © 2008 Microchip Technology Inc. 5.3.3 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 expects one configuration byte following the address ...

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... Master may read the configuration byte to check the RDY bit condition.The Master may continuously send clock (SCL) to repeatedly read the configuration byte (to check the RDY bit status). Figures 5-4 and 5-5 show the timing diagrams of the reading. Digital Output Codes © 2008 Microchip Technology Inc. ...

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Page 25

... Note: The I C specification does not allow “00000000” (00h) in the second byte. FIGURE 5-6: General Call Address Format. © 2008 Microchip Technology Inc. 5.5 High-Speed (HS) Mode 2 The I C specification requires that a high-speed mode device must be ‘activated’ to operate in high-speed mode. This is done by sending a special address byte of “ ...

Page 26

... SDA line to allow the Master (microcontrol- ler) to generate a STOP or repeated START condition. The non-acknowledgement (NAK) is issued by provid- ing the SDA line to “HIGH” during the 9th clock pulse. is (D) (D) ADDRESS OR DATA ACKNOWLEDGE ALLOWED VALID TO CHANGE 2 C Serial Bus. (C) (A) STOP CONDITION © 2008 Microchip Technology Inc. ...

Page 27

... If this parameter is too short, it can create an unintended Start or Stop condition to other devices on the bus line. If this parameter is too long, Clock Low time (T 4: For Data Input: If this parameter is too long, the Data Input Setup (T For Data Output: This parameter is characterized, and tested indirectly by testing T © 2008 Microchip Technology Inc. = -40 to +85° Min Typ ...

Page 28

... SCL 100 pF 3.4 MHz b SCL 400 pF 1.7 MHz b SCL 100 pF 3.4 MHz b SCL 400 pF 1.7 MHz b SCL ns After this period, the first clock pulse is generated HD:DAT ) can be affected. LOW parameter. AA © 2008 Microchip Technology Inc. ...

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... The pull-up resistor is typically chosen between 5 kΩ and 10 kΩ ranges for standard and fast modes, and less than 1 kΩ for high speed mode depending on the presence of bus loading capacitance. © 2008 Microchip Technology Inc. 2 6.1 ADDRESS SELECTION PINS ...

Page 32

... Characteristics”. (a) Differential Input Signal Connection: Excitation 8 9 Stop Bit (b) Single-ended Input Signal Connection: R/W Excitation MCP342x Response Sensor FIGURE 6-4: Single-Ended Input Connections. Sensor CHn+ Input Signal CHn- MCP342x R 1 CHn+ Input Signal R 2 CHn- MCP342x Differential and © 2008 Microchip Technology Inc. ...

Page 33

... FIGURE 6-5: Battery Voltage and Charging/Discharging Current Measurement. © 2008 Microchip Technology Inc. value. The voltage drops across the sensor is waste. Therefore, the current measurement often prefers to use a current sensor with smaller resistance value, which, in turn, requires high resolution ADC device. ...

Page 34

... Where: 1 LSB = Isothermal Block MCP9800 SDA SCL MCP9800 SDA SCL μ = 15.625 V/PGA = 1.953125μV for PGA = 8 μ • μ V/°C = 320 V/°C μ 320 V/°C = ------------------------ - = 20.48 Codes/°C μ 15.625 V 15.625 µV with 18 bit configuration © 2008 Microchip Technology Inc. ...

Page 35

... 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 (sensor excitation volt- of full scale output for V DD © 2008 Microchip Technology Inc. ⎞ ⎟ ----------------------- - ⎟ 15.625μV ⎠ ...

Page 36

... The thermistor sensor is simple to use and widely used for the temperature measurement applications. It has both linear and non-linear responses over temperature range used to adjust the linear region of interest 1 for measurement. DS22088B-page 36 ⎞ ⎟ 100 mV ⎟ ⎠ PGA ) forms a 2 © 2008 Microchip Technology Inc. ...

Page 37

... 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 pads of the board and read conversion codes using the easy-to-use PICkit™ ...

Page 38

Page 39

... Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. © 2008 Microchip Technology Inc. MCP3422/3/4 Example: AGM 835 ...

Page 40

... YWWNNN 14-Lead SOIC (150 mil) (MCP3424) XXXXXXXXXXX XXXXXXXXXXX YYWWNNN 14-Lead TSSOP (4.4 mm) (MCP3424) XXXXXXXX YYWW NNN DS22088B-page 40 Example 3423 2 9 0835 3 8 256 Example: 3423E 835256 Example: MCP3424 e E/SL^^ 3 0816256 Example: MCP3424E 0816 256 © 2008 Microchip Technology Inc. ...

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... Microchip Technology Inc. MCP3422/3/4 DS22088B-page 45 ...

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... Microchip Technology Inc. MCP3422/3/4 DS22088B-page 47 ...

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Page 51

... Added new package marking information and package outline drawings for MCP3422 and MCP3423 devices. 3. Added MCP3422 and MCP3423 devices to Product Identification System page. Revision A (June 2008) • Original Release of this Document. © 2008 Microchip Technology Inc. MCP3422/3/4 DS22088B-page 51 ...

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... Default option. Contact Microchip factory for other address options. © 2008 Microchip Technology Inc. Examples: X /XX 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, ...

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... PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2008, Microchip Technology Incorporated, Printed in the U ...

Page 56

... Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2008 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...

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