Datasheet

ManualsBrandsSeeed Studio ManualsDevelopment Boards & KitsGrove I2C Thermocouple Amplifier

 2015-2017 Microchip Technology Inc. DS20005426C-page 1

MCP9600

Features

• Thermocouple Electromotive Force (EMF) to °C

Converter:

- Integrated Cold-Junction Compensation

• Supported Types (designated by NIST ITS-90):

- Type K, J, T, N, S, E, B and R

• ±1.5°C (Max.) Hot-Junction Accuracy

• Measurement Resolution:

- Hot and Cold-Junctions: +0.0625°C (typical)

• Four Programmable Temperature Alert Outputs:

- Monitor Hot or Cold-Junction Temperatures

- Detect Rising or Falling Temperatures

- Up to 255°C of Programmable Hysteresis

• Programmable Digital Filter for Temperature

• Low Power:

- Shutdown Mode

- Burst Mode: 1 to 128 Temperature Samples

• 2-Wire Interface: I

C Compatible, 100 kHz:

- Supports Eight Devices per I

C Bus

• Operating Voltage Range: 2.7V to 5.5V

• Operating Current: 300 µA (typical)

• Shutdown Current: 2 µA (typical)

• Package: 20-lead MQFN

Typical Applications

• Petrochemical Thermal Management

• Hand-Held Measurement Equipment

• Industrial Equipment Thermal Management

•Ovens

• Industrial Engine Thermal Monitor

• Temperature Detection Racks

Description

Microchip Technology Inc.’s MCP9600 converts

thermocouple EMF to degree Celsius with integrated

cold-junction compensation. This device corrects the

thermocouple nonlinear error characteristics of eight

thermocouple types and outputs ±1.5°C accurate

temperature data for the selected thermocouple. The

correction coefficients are derived from the National

Institute of Standards and Technology (NIST) ITS-90

Thermocouple Database.

The MCP9600 digital temperature sensor comes with

user-programmable registers which provide design

flexibility for various temperature sensing applications.

The registers allow user-selectable settings, such as

Low-Power modes for battery-powered applications,

adjustable digital filter for fast transient temperatures

and four individually programmable temperature alert

outputs which can be used to detect multiple

temperature zones.

The temperature alert limits have multiple

user-programmable configurations, such as alert

polarity as either an active-low or active-high push-pull

output, and output function as a Comparator mode

(useful for thermostat-type operation) or Interrupt mode

for microprocessor-based systems. In addition, the

alerts can detect either a rising or a falling temperature

with up to +255°C hysteresis.

This sensor uses an industry standard 2-wire, I

compatible serial interface and supports up to eight

devices per bus by setting the device address using the

ADDR pin.

Package Type

MCP9600

PIC

MCU

Alert

GND

Types K, J, T,

N, E, B, S, R

IN+

IN-

C+

C-

ADDR

GND

Alert 4

Alert 3

GND

Alert 2

SDA

SCL

GND

19 18 17

6789

GND

Alert 1

ADDR

MCP9600

5x5 MQFN*

* Includes Exposed Thermal Pad (EP); see Table 3-1.

Thermocouple EMF to Temperature Converter,

±1.5°C Maximum Accuracy

Summary of content (50 pages)

PAGE 1
MCP9600 Thermocouple EMF to Temperature Converter, ±1.5°C Maximum Accuracy Features Description • Thermocouple Electromotive Force (EMF) to °C Converter: - Integrated Cold-Junction Compensation • Supported Types (designated by NIST ITS-90): - Type K, J, T, N, S, E, B and R • ±1.5°C (Max.) Hot-Junction Accuracy • Measurement Resolution: - Hot and Cold-Junctions: +0.
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MCP9600 MCP9600 Registers MCP9600 Evaluation Board (ADM00665) MCP9600 DS20005426C-page 2  2015-2017 Microchip Technology Inc.
PAGE 3
MCP9600 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings† VDD............................................................................................................................................................................ 6.0V Voltage at All Input/Output Pins ........................................................................................................ GND – 0.3V to 6.0V Storage Temperature .......................................................................................
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MCP9600 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, TA = -40°C to +125°C (where: TA = TC, defined as Device Ambient Temperature). Parameters Sensor Characteristics TC and TH Temperature Resolution Sampling Rate (TA = +25°C) Temperature Calculation Time Thermocouple Input Offset Error Offset Error Drift Full-Scale Gain Error Full-Scale Gain Error Drift Sym. Min. Typ. Max. Unit Conditions TRES tCONV tCALC — — — — — — ±0.
PAGE 5
MCP9600 INPUT/OUTPUT PIN DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, TA = -40°C to +125°C (where: TA = TC, defined as Device Ambient Temperature). Parameters Sym. Min. Typ. Max. Units V Conditions 2 Serial Input/Output and I C Slave Address Input (ADDR) Input (SCL, SDA) High-Level Voltage Low-Level Voltage VIH 0.7 VDD — — VIL — — 0.3 VDD V ILEAK — — ±2 µA Low-Level Voltage VOL — — 0.
PAGE 6
MCP9600 SENSOR SERIAL INTERFACE TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -40°C to +125°C, VDD = 2.7V to 5.5V and CL = 80 pF (Note 1:). Parameters Sym. Min. Max.
PAGE 7
MCP9600 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. Note: Unless otherwise indicated, VDD = 2.
PAGE 8
MCP9600 Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD and TA = -40°C to +125°C. 0.500 0.50 Sensitivity (Δ°C/LSb) Type S 0.25 Tǻ_ACY (°C) Specified Range 0.00 -0.25 Specified Range 0.250 Type S -0.50 -200 300 800 1300 Tǻ Temperature, ITS-90 Database (°C) 1800 FIGURE 2-7: Typical Temperature Accuracy from NIST ITS-90 Database, Type S. 1800 0.500 Type R Specified Range Tǻ_ACY (°C) 0.
PAGE 9
MCP9600 Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD and TA = -40°C to +125°C. 0.50 0.500 Sensitivity (Δ°C/LSb) Type T Tǻ_ACY (°C) 0.25 0.00 -0.25 -0.50 -200 300 800 1300 Tǻ Temperature, ITS-90 Database (°C) 0.250 0.000 -200 1800 FIGURE 2-13: Typical Temperature Accuracy from NIST ITS-90 Database, Type T. 1800 0.500 Type B Sensitivity (Δ°C/LSb) Type B 0.
PAGE 10
MCP9600 Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD and TA = -40°C to +125°C. 0.005 Integral Nonlinearity (% of FSR) 10.0 TA = +25°C 5.0 2.5 0.0 -100 -75 -50 -25 0 25 50 Input Voltage (% of Full-Scale) 75 0.003 0.002 0.001 0.000 100 Input Noise, % of Full Scale. FIGURE 2-19: 0.004 2.5 40% VDD = 3.3V 722 units at -40°C, +45°C, +125°C 64 units at other temperatures 4.5 5.0 5.5 TA = -40°C to +125°C VDD = 3.3V 2787 units 30% Occurrences 1.
PAGE 11
MCP9600 Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to VDD and TA = -40°C to +125°C. 500 2.0 400 85C TA = +85°C 300 TA = -40°C -40C 35C TA = +35°C 85C TA = + 85°C 125C TA = +125°C 200 2.5 3.0 3.5 4.0 VDD (V) 4.5 5.0 0.0 2.5 5.5 I2C Inactive, IDD Across VDD. FIGURE 2-25: -40C TA = -40°C 35C TA = +35°C 85C TA = + 85°C 125C TA = +125°C 1500 1000 3.5 4.0 VDD (V) 4.5 5.0 5.5 T-40C A = -40°C TA = +35°C 35C 85C TA = +85°C 125C TA = +125°C 40.
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MCP9600 NOTES: DS20005426C-page 12  2015-2017 Microchip Technology Inc.
PAGE 13
MCP9600 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 5x5 MQFN Symbol Pin Function 1, 3, 5,13, 17 GND Electrical Ground 2 VIN+ Thermocouple Positive Terminal Input 4 VIN- Thermocouple Negative Terminal Input 6, 7, 9, 10, 18 GND Not Electrical Ground; must be tied to Ground 8 VDD Power 3.
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MCP9600 NOTES: DS20005426C-page 14  2015-2017 Microchip Technology Inc.
PAGE 15
MCP9600 4.0 SERIAL COMMUNICATION 4.1 2-Wire Standard Mode I2C Protocol-Compatible Interface The MCP9600 device’s Serial Clock Input (SCL) and the bidirectional Serial Data Line (SDA) form a 2-wire bidirectional data communication line (refer to the Input/Output Pin DC Characteristics table and Sensor Serial Interface Timing Specifications table).
PAGE 16
MCP9600 4.1.5 DATA VALID After the Start condition, each bit of data in transmission needs to be settled for a time specified by tSU-DATA before SCL toggles from low-to-high (see the “Sensor Serial Interface Timing Specifications” section). 4.1.6 ACKNOWLEDGE (ACK/NAK) Each receiving device, when addressed, is expected to generate an ACK bit after the reception of each byte. The master device must generate an extra clock pulse for ACK to be recognized.
PAGE 17
MCP9600 1 2 3 4 5 6 7 8 1 1 0 0 A 2 A 1 A 0 W C 1 2 3 4 5 6 7 8 0 0 0 0 0 0 x x SCL SDA S A K TABLE 4-2: Address Byte MCP9600 A C P K POINTERS Read-Only Registers Pointer TH 0000 0000 T∆ 0000 0001 TC 0000 0010 MCP9600 Clock Stretching 1 2 3 4 5 6 7 8 1 1 0 0 A 2 A 1 A 0 R C 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 1 1 2 3 4 5 6 7 8 1 0 0 1 0 1 0 0 SCL SDA S A K Address Byte A C K MSB Data MCP9600 N A K P LSB Data M
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MCP9600 1 2 3 4 5 6 7 8 1 1 0 0 A 2 A 1 A W 0 1 2 3 4 5 6 7 8 0 0 0 0 0 1 0 x 1 2 3 4 5 6 7 8 x x x x x x x x SCL SDA S A C K A C K Address Byte A C K P Register Data TABLE 4-3: MCP9600 POINTERS Read/Write Registers Pointer STATUS 0000 0100 Configuration 0000 0101 0000 0110 MCP9600 Clock Stretching 1 2 3 4 5 6 7 8 1 1 0 A 0 A A A R C 2 1 0 K 1 2 3 4 5 6 7 8 x x x x x x x N x A P K SCL SDA S Address Byte LSB Data M
PAGE 19
MCP9600 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 1 0 0 A 2 A 1 A A W C 0 K 0 0 0 1 0 0 x x 1 2 3 4 5 6 7 8 x x x x x x x x C SCL SDA S Address Byte TABLE 4-4: MCP9600 A C K A Alert 1, 2, 3, 4 MSB POINTERS Alert Limit Registers Pointer Alert 1 0001 0000 Alert 2 0001 0001 Alert 3 0001 0010 Alert 4 0001 0011 K 1 2 3 4 5 6 7 8 x x x x x x x x A C P K Alert 1, 2, 3, 4 LSB MCP9600 Clock Stretching 1 2 3 4 5 6 7 8 1 1 0 0 A
PAGE 20
MCP9600 MCP9600 Clock Stretching 1 2 3 4 5 6 7 8 1 1 0 0 A 2 A 1 A 0 R C 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 SCL SDA S A K Address Byte A C K TH MSB Data MCP9600 MCP9600 Clock Stretching (Note 1:) 1 2 3 4 5 6 7 8 x x x x x x x x A C K 1 2 3 4 5 6 7 8 x x x x x x x x TH LSB Data A C K x x x x Master Master TC MSB Data x x N A K P Master TC LSB Data Device ID LSB Note 1: All registers can be read sequentially starting from the
PAGE 21
MCP9600 5.0 FUNCTIONAL DESCRIPTION The MCP9600 temperature sensor consists of an 18-bit Delta-Sigma Analog-to-Digital Converter (ADC), which is used to measure the thermocouple voltage or EMF, a digital temperature sensor used to measure cold-junction + VIN+ or ambient temperature and a processor core which is used to compute the EMF to degree Celsius conversion using coefficients derived from the NIST ITS-90 coefficients.
PAGE 22
MCP9600 The MCP9600 device has several registers that are user-accessible. These registers include the Thermocouple Temperature (cold-junction compensated), Hot-Junction Temperature, Cold-Junction Temperature, Raw ADC Data, user-programmable Alert Limit registers, and STATUS and Configuration registers. The Temperature and the Raw ADC Data registers are read-only registers, used to access the thermocouple and the ambient temperature data.
PAGE 23
MCP9600 TABLE 5-1: SUMMARY OF REGISTERS AND BIT ASSIGNMENTS Register Pointer bit 7 bit 6 bit 5 bit 4 bit 3 Hot-Junction Temperature – TH 00000000 SIGN 1024°C 512°C 256°C 128°C 64°C 32°C 16°C 8°C 4°C 2°C 1°C 0.5°C 0.25°C 0.125°C 0.0625°C Junctions Temperature Delta – T∆ 00000001 SIGN 1024°C 512°C 256°C 128°C 64°C 32°C 16°C 8°C 4°C 2°C 1°C 0.5°C 0.25°C 0.125°C 0.0625°C Cold-Junction Temperature – TC 00000010 128°C 64°C 32°C 16°C 8°C 4°C 2°C 1°C 0.5°C 0.
PAGE 24
MCP9600 5.1 Thermocouple Temperature Sensor Registers This device integrates three Temperature registers that are used to read the cold and hot-junction temperatures, and the sum of the two junctions to output the absolute thermocouple temperature. In addition, the Raw ADC Data register, which is used to derive the thermocouple temperature, is available. The following sections describe each register in detail. 5.1.
PAGE 25
MCP9600 5.1.2 THERMOCOUPLE JUNCTIONS DELTA TEMPERATURE REGISTER (T∆) This register contains the error corrected Thermocouple Hot-Junction temperature without the Cold-Junction compensation. The error correction methodology uses several coefficients to convert the digitized Thermocouple EMF voltage to degree Celsius. Each Thermocouple type has a unique set of coefficients as specified by NIST, and these coefficients are available in the configuration register for user selection as shown in Figure 5-3.
PAGE 26
MCP9600 5.1.3 COLD-JUNCTION/AMBIENT TEMPERATURE REGISTER (TC) TABLE 5-2: The MCP9600 integrates an ambient temperature sensor which can be used to measure the thermocouple cold-junction temperature. For accurate measurement, the MCP9600 will have to be placed at close proximity to the thermocouple cold-junction to detect the junction ambient temperature. This is a 16-bit double-buffered, read-only register. The temperature resolution is user-selectable to 0.0625°C/LSb or 0.
PAGE 27
MCP9600 5.1.4 ANALOG-TO-DIGITAL CONVERTER (ADC) ADC Core The MCP9600 uses an 18-bit Delta-Sigma Analog-to-Digital Converter to digitize the Thermocouple EMF voltage and the data is available in the ADC register. The ADC measurement resolution is selectable, which enables the user to choose faster conversion times with reduced resolution. This feature is useful to detect fast transient temperatures.
PAGE 28
MCP9600 5.2 Sensor STATUS and Configuration Registers This device provides various temperature and measurement Status bits which can be monitored regularly by the master controller. In addition, this device integrates various user-programmable features which can be useful to develop complex thermal management applications. The following sections describe each feature in detail. REGISTER 5-6: 5.2.
PAGE 29
MCP9600 5.2.2 THERMOCOUPLE SENSOR CONFIGURATION REGISTER EQUATION 5-4: DIGITAL FILTER Y = k  X +  1 – k   Y–1 n k = 2  2 + 1 The MCP9600 Sensor Configuration register is used to select the thermocouple sensor types and to select the digital filter options. This device supports eight thermocouple types. Each type has a unique set of error correction coefficients that are derived from the NIST Thermocouple EMF Voltage Conversion database.
PAGE 30
MCP9600 5.2.3 DEVICE CONFIGURATION REGISTER The device Configuration register allows the user to configure various functions, such as sensor measurement resolutions and Power modes. The Resolution register is used to select the sensor resolution for the desired temperature conversion time. When resolutions are changed, the change takes effect when the next measurement cycle begins.
PAGE 31
MCP9600 5.3 Temperature Alert Registers TABLE 5-4: This device provides four Temperature Alert registers that are individually configured, which allow users to monitor multiple temperature zones with a single device. The following sections describe each alert feature in detail. 5.3.
PAGE 32
MCP9600 TH 0 TC 1 Output Mode Control Comparator 0 0 Interrupt 1 1 Digital Comparator TH/TC Alert Output Alert Limit +/– Int. Clear Alert Hysteresis Comparator/Interrupt Mode Rise/Fall Alert Limits Set to Detect TH and TC. FIGURE 5-8:  TALERT1 TALERT1 Active High/Low  TALERT1 – THYST1  TALERT2 TALERT2  TALERT3 + THYST3 TH  TALERT2 – THYST2 TALERT3  TALERT3  TALERT4 Comparator Interrupt Int. Clear Comparator Interrupt Int.
PAGE 33
MCP9600 5.3.2 ALERT HYSTERESIS REGISTER TABLE 5-5: This device integrates four individually controlled temperature Alert Hysteresis registers for each alert output, with a range of 0°C to +255°C. The alert hysteresis directions are set using bit 3 of the corresponding Alert Configuration registers (Register 5-10) to detect rising or falling temperatures.
PAGE 34
MCP9600 5.3.3 ALERT CONFIGURATION REGISTERS The microcontroller will have Acknowledged the interrupt signal from the corresponding alert output by clearing the interrupt using bit 7 of the corresponding Configuration register. This device integrates four individually controlled temperature alert outputs. Each output is configured for the corresponding alert output using the Alert Output Configuration registers.
PAGE 35
MCP9600 5.3.4 DEVICE ID AND REVISION ID REGISTER The Device ID and Revision ID register is a 16-bit read-only register, which can be used to identify this device among other devices on the I2C bus. The upper 8 bits indicate the Device ID of 0x40, while the lower REGISTER 5-12: R-0 8 bits indicate the device revision. The device revision byte is divided into nibbles, where the upper nibble indicates the major revision and the lower nibble indicates minor revisions for each major revision.
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MCP9600 NOTES: DS20005426C-page 36  2015-2017 Microchip Technology Inc.
PAGE 37
MCP9600 6.0 APPLICATION INFORMATION 6.1 Layout Considerations The MCP9600 does not require any additional components to digitize thermocouples. However, it is recommended that a decoupling capacitor of 0.1 µF to 1 µF be used between the VDD and GND pins. A high-frequency ceramic capacitor is recommended. It is necessary for the capacitor to be located as close as possible to the VDD and ground pins of the device in order to provide effective noise protection.
PAGE 38
MCP9600 EQUATION 6-1: EFFECT OF SELF-HEATING T  =  JA  V DD  I DD  T  =  J C  V DD  I DD  T  = TJ 6.2.3 – TA Where: TJ = Junction Temperature TA = Ambient Temperature JA = Package Thermal Resistance: - Junction to Ambient JC = Package Thermal Resistance: Junction to Case At room temperature (TA = +25°C) with IDD = 2.5 mA (maximum) and VDD = 3.3V, the self-heating due to power dissipation, T, is 0.32°C for the MQFN package. 6.2.2 CONVERSION TIME vs.
PAGE 39
MCP9600 6.3 Device Features 6.3.2 I2C ADDRESSING 6.3.1 The MCP9600 supports up to eight devices on the I2C bus. Applications, such as large thermal management racks with several thermocouple sensor interfaces, are able to monitor various temperature zones with minimal pin count microcontrollers. This reduces the total solution cost, while providing a highly accurate thermal management solution using the MCP9600.
PAGE 40
MCP9600 6.3.3.1 Open-Circuit Detection Technique For open-circuit detection, the Input Range Flag bit, bit 4 of the STATUS register (Register 5-6), can be used to detect open-circuit conditions. This would require a few external resistors, as shown in Figure 6-6. The passive circuit does not affect the MCP9600 accuracy (the recommended value for RB is set to 1 M. When the thermocouple is connected, the input Common-mode voltage is 0.5 * VDD.
PAGE 41
MCP9600 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 20-Lead MQFN (5x5x1.0 mm) PIN 1 Example PIN 1 MCP9600 E/MX e 1720256 3 Legend: XX...X Y YY WW NNN e3 * Note: Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free.
PAGE 42
MCP9600 20-Lead More Thin Plastic Quad Flat, No Lead Package (NU) - 5x5x1.0 mm Body [MQFN] - (Also called VQFN) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging D NOTE 1 A B N 1 2 E (DATUM B) (DATUM A) 2X 0.10 C 2X TOP VIEW 0.10 C 0.10 C C SEATING PLANE A1 A 20X (A3) 0.08 C SIDE VIEW D2 E2 2 K 1 NOTE 1 N 20X b 0.10 0.
PAGE 43
MCP9600 20-Lead More Thin Plastic Quad Flat, No Lead Package (NU) - 5x5x1.0 mm Body [MQFN] - (Also called VQFN) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging Units Dimension Limits Number of Pins N e Pitch A Overall Height Standoff A1 Terminal Thickness A3 Overall Length D Exposed Pad Length D2 Overall Width E Exposed Pad Width E2 b Terminal Width Terminal Length L K Terminal-to-Exposed-Pad MIN 0.90 0.00 3.
PAGE 44
MCP9600 20-Lead More Thin Plastic Quad Flat, No Lead Package (NU) - 5x5x1.0 mm Body [MQFN] - (Also called VQFN) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.
PAGE 45
MCP9600 APPENDIX A: REVISION HISTORY Revision C (September 2017) The following is the list of modifications: 1. 2. 3. Updated Figure 4-3, Equation 5-1, Equation 5-2 and Equation 5-3. Updated Section 6.3.3.1 “Open-Circuit Detection Technique”. Various typographical edits. Revision B (June 2016) The following is the list of modifications: 1. 2. 3. 4. Corrected the pin description error for pins 19 and 20 on page 1. Added the MCP9600 Evaluation Board picture on page 2. Added Section 6.3.3.
PAGE 46
MCP9600 NOTES: DS20005426C-page 46  2015-2017 Microchip Technology Inc.
PAGE 47
MCP9600 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. [X](2) X /XX Tape and Reel Option Temperature Range Package PART NO.
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MCP9600 NOTES: DS20005426C-page 48  2015-2017 Microchip Technology Inc.
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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 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.
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