My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6682MUA
- Part No.:
- MAX6682MUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Sensor and Detector Interfaces
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6682MUA.pdf
- Description:
- THERMISTOR-TO-DIGITAL CONVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:7,056
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6682MUA from Maxim Integrated is a thermistor-to-digital converter IC that directly digitizes temperature-dependent resistance of NTC thermistors into 10-bit + sign output codes. It integrates an internal voltage reference, low-power ADC, and SPI-compatible serial interface, operating with 21µA typical standby current and supporting -55°C to +125°C industrial temperature range. Used in battery chargers, HVAC sensors, and medical temperature monitoring circuits where self-heating error must be minimized.
For engineers reviewing the MAX6682MUA datasheet, MAX6682MUA pinout, MAX6682MUA application, or MAX6682MUA equivalent, this page delivers verified technical context, exact pin functions, real-world linearity performance over 0°C–50°C, supply-current behavior at varying clock frequencies, and validated alternative parts for thermistor interface redesigns.
Technical Context
The MAX6682MUA implements a dedicated analog front-end that energizes the external thermistor only during conversion, using its internal 1.10–1.40V reference to drive a voltage divider formed by REXT and the thermistor. It measures the voltage across REXT-not the thermistor-enabling quasi-linear output scaling when REXT is correctly selected (e.g., 7680Ω for 0°C–50°C).
Its 10-bit ADC delivers total unadjusted error of ±3 LSB over temperature, with conversion time fixed at 64–80ms and output resolution of 0.125°C per LSB in calibrated ranges. The SPI interface operates up to 5MHz, requires no write commands (read-only), and outputs 11-bit words (sign + 10 data bits) synchronized to SCK rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit + sign (11-bit output word), LSB = 0.125°C in 0°C to +50°C range with REXT = 7680Ω |
| ADC Total Unadjusted Error | ±3 LSB - defines worst-case deviation from ideal transfer curve without calibration |
| Conversion Time | 64–80 ms - fixed duration per measurement; determines max sampling rate of 0.5 Hz |
| Supply Current (Standby) | 3–7 µA - active only when CS is low and SCK inactive; enables ultra-low-power sleep modes |
| Reference Voltage | 1.10–1.40 V - internally generated, load-regulated to ±0.1%/mA, isolates thermistor from VCC noise |
| SPI Clock Frequency | Up to 5 MHz - supports fast readout without external timing components or microcontroller overhead |
| R- Input Impedance | 1 MΩ - minimizes loading error on thermistor/REXT junction during voltage sampling |
Pinout & Package
MAX6682MUA is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), specified for -55°C to +125°C operation. Pin 1 is internally connected (I.C.) and must be tied to GND or left floating per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I.C.) | Internally Connected | No external connection required; tie to GND or leave unconnected per layout guidelines |
| 2 (R+) | Reference Voltage Output | Drives positive side of thermistor/REXT divider; supplies 1.10–1.40V reference with <0.1%/mA load regulation |
| 3 (R-) | External Resistor Negative Input | Connects to junction of REXT and thermistor; high-impedance (1MΩ) input minimizes current draw and measurement error |
| 4 (GND) | Analog/Digital Ground | Common return for VCC, thermistor, and reference circuitry; critical for noise rejection and accuracy |
| 5 (CS) | Chip Select | Active-low enable: forces conversion abort on falling edge; initiates new conversion on rising edge |
| 6 (SO) | Serial Data Output | 3-state SPI output delivering 11-bit D10–D0 (sign + 10-bit code) on SCK rising edges |
| 7 (SCK) | Serial Clock Input | Accepts up to 5MHz clock; controls timing of SO bit output and internal state transitions |
| 8 (VCC) | Positive Supply | 3.0–5.5V operation; requires local 0.1µF ceramic bypass capacitor to suppress supply noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Thermistor self-heating suppression | Reduces average thermistor current to ~2% duty cycle; cuts self-heating error from >1°C to ~0.0015°C in typical 10kΩ setups |
| Reference voltage isolation | Internal 1.22V reference decouples thermistor bias from noisy VCC rails, improving immunity to supply ripple up to 10MHz |
| Direct °C-scaled output | With REXT = 7680Ω and standard 10kΩ NTC (e.g., Betatherm 10K3A1), output maps linearly to temperature over +10°C to +40°C (±0.2°C error) |
| Read-only SPI interface | No command protocol or register writes needed; simplifies firmware integration and eliminates configuration errors |
| Low-power conversion architecture | Shuts down internal reference and analog circuitry between conversions, achieving 17–29µA average current at 0.5Hz sampling |
Applications
| HVAC Sensor Node | Medical Patient Temperature Monitor |
|---|---|
|
Use Scenario: Ambient air temperature sensing in wall-mounted thermostats with battery backup and wireless transmission. IC Role / Device Role / Timing Role: Thermistor-to-digital converter providing calibrated 0.125°C-resolution readings every 2 seconds via SPI to low-power MCU. Use Value: Enables 5-year battery life via 21µA standby current and eliminates need for external ADC or reference IC. |
Use Scenario: Disposable skin-contact temperature probe used in clinical vital-signs monitors. IC Role / Device Role / Timing Role: Digitizes 10kΩ NTC thermistor output with ±0.2°C accuracy over +10°C to +40°C body range. Use Value: Delivers direct °C-scaled output without software linearization, reducing MCU processing load and firmware validation scope. |
| Battery Pack Thermal Protection | Smart Home Appliance Temperature Control |
|
Use Scenario: Real-time cell temperature monitoring in Li-ion battery packs for EV charging systems and UPS units. IC Role / Device Role / Timing Role: Reads thermistor network across multiple cells using shared SPI bus and individual CS lines. Use Value: Supports -55°C to +125°C full-range operation with <1µA leakage on R- pin, preventing false overtemperature trips. |
Use Scenario: Oven cavity and refrigerator evaporator temperature feedback in connected kitchen appliances. IC Role / Device Role / Timing Role: Provides stable digital temperature data to appliance MCU under wide VCC (3–5.5V) and thermal cycling conditions. Use Value: Internal reference and rail-to-rail compatible interface ensure consistent accuracy despite 120VAC-derived supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermistor interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31865 | RTD-focused 15-bit delta-sigma ADC with programmable excitation current; supports 2-/3-/4-wire RTDs, not NTC thermistors | Designed for platinum RTD sensors (e.g., PT100), not NTC thermistors; requires different sensor physics and calibration | Select only if migrating from NTC to RTD-based sensing; not drop-in for MAX6682MUA thermistor circuits |
| ADS1118 | General-purpose 16-bit delta-sigma ADC with internal reference and thermocouple support; no built-in thermistor scaling or self-heating mitigation | Requires external voltage reference, biasing circuit, and software linearization; higher power (350µA active) | Choose when multi-sensor flexibility (thermocouple, voltage, current) outweighs thermistor-specific optimization and low-power needs |
Compared with MAX31865 and ADS1118, the MAX6682MUA uniquely combines NTC-optimized front-end design, sub-µA standby current, and factory-calibrated °C scaling-making it irreplaceable in cost-sensitive, battery-powered thermistor applications demanding minimal firmware overhead.
Availability
MAX6682MUA is available at Aetrix Electronics and suitable for HVAC sensor nodes, medical patient monitors, and battery pack thermal protection requiring stable component supply, long-lifecycle assurance, and guaranteed -55°C to +125°C performance.
Supply support for MAX6682MUA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications systems.
The MAX6682MUA belongs to Maxim's temperature-sensing product line, engineered specifically to simplify high-accuracy thermistor interfacing while eliminating self-heating errors and minimizing system-level calibration effort.
FAQ
What is the maximum operating temperature range supported by the MAX6682MUA?
The MAX6682MUA is fully specified from -55°C to +125°C. All electrical characteristics-including ADC error, reference voltage stability, and supply current-are guaranteed across this full industrial temperature range. This makes the MAX6682MUA suitable for under-hood automotive modules, industrial motor controllers, and outdoor environmental sensors where extreme thermal conditions occur. The device maintains ±3 LSB total unadjusted error even at +125°C ambient.
Does the MAX6682MUA require external calibration to achieve accurate temperature readings?
The MAX6682MUA does not require system-level calibration to deliver usable temperature data. When paired with a standard 10kΩ NTC thermistor (e.g., Betatherm 10K3A1) and REXT = 7680Ω, it provides output scaled to 0.125°C/LSB over +10°C to +40°C with ±0.2°C linearity error. Calibration beyond this is optional and only needed for extended ranges or tighter accuracy-no trimming resistors, EEPROM storage, or firmware compensation is mandatory for basic operation of the MAX6682MUA.
Can the MAX6682MUA interface directly with a 1.8V microcontroller SPI port?
No-the MAX6682MUA requires VCC between 3.0V and 5.5V and is not 1.8V I/O compatible. Its digital pins (CS, SCK, SO) operate at VCC-referenced logic levels: VIH = 0.8×VCC and VIL = 0.2×VCC. Driving CS or SCK from a 1.8V MCU will fail to meet VIH minimum when VCC ≥ 3V. A level-shifter or 3.3V-compatible MCU is required. The MAX6682MUA itself cannot be powered from 1.8V nor tolerate 1.8V signals on any pin.
How does the MAX6682MUA minimize thermistor self-heating errors compared to discrete solutions?
The MAX6682MUA reduces thermistor self-heating by powering the sensor only during the 64–80ms conversion window-less than 2% of the time at 0.5Hz sampling-and using a low 1.22V reference instead of full VCC. In a typical 10kΩ thermistor + 5110Ω REXT setup at +40°C, discrete biasing would cause ~1.22°C self-heating, whereas the MAX6682MUA limits it to ~0.0015°C. This is achieved via integrated power-gating of the reference and analog front-end between conversions-functionality not replicable with op-amps, references, and ADCs alone.
What thermistor types and values are explicitly validated for use with the MAX6682MUA?
The MAX6682MUA datasheet validates three specific 10kΩ NTC thermistors at +25°C: Betatherm 10K3A1, Dale 1M1002, and Thermometrics C100Y103J. These share nearly identical R-T curves and yield the published output tables (e.g., Table 1) when used with REXT = 7680Ω. While other NTCs may function, their coefficient mismatch introduces nonlinearity beyond the ±0.2°C spec. The MAX6682MUA is not characterized for PTC, RTD, or silicon-based temperature sensors-only for the listed NTC variants.
MAX6682MUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Temperature Sensor
- Input Type:
- Logic
- Output Type:
- 3-Wire SPI Serial
- Current - Supply:
- 29 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX6682MUA FAQ
1.How can I place an order for MAX6682MUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6682MUA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6682MUA reliable?
The price and inventory of MAX6682MUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6682MUA is usually 5 days.
3.What payment methods are accepted for MAX6682MUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6682MUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6682MUA?
MAX6682MUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6682MUA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6682MUA?
For technical support, including MAX6682MUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6682MUA requirements.
6.How does Aetrix verify that MAX6682MUA is sourced from the original manufacturer or authorized distributors?
All MAX6682MUA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6682MUA meets industry standards.
7.What is the process for return or replacement of MAX6682MUA?
All MAX6682MUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6682MUA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6682MUA part is unused and in its original packaging.
Return procedure for MAX6682MUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6682MUA Tags
-
RE46C100S8TF
Microchip Technology
-
XTR111AIDRCR
Texas Instruments
-
XTR111AIDGQR
Texas Instruments
-
XTR117AIDGKR
Texas Instruments
-
XTR111AIDGQT
Texas Instruments
-
XTR115UA/2K5
Texas Instruments
-
MAX14626ETT+T
Analog Devices Inc./Maxim Integrated
-
XTR116UA/2K5
Texas Instruments
-
XTR115U/2K5
Texas Instruments
-
XTR116U/2K5
Texas Instruments
-
PGA308AIDGSR
Texas Instruments
-
XTR300AIRGWR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
