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Texas Instruments LM70CIMMX-3/NOPB
- Part No.:
- LM70CIMMX-3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM70CIMMX-3/NOPB.pdf
- Description:
- SENSOR DIGITAL -55C-150C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:635
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Product details
Overview
LM70CIMMX-3/NOPB from Texas Instruments is a 10-bit plus sign ΔΣ digital temperature sensor with SPI/MICROWIRE interface, operating from −55°C to +150°C with 0.25°C resolution, ±2°C accuracy over −40°C to +85°C, and 2.65V–5.5V supply range - used for real-time thermal monitoring in disk drives and embedded control systems.
For engineers reviewing the LM70CIMMX-3/NOPB datasheet, LM70CIMMX-3/NOPB pinout, LM70CIMMX-3/NOPB application, or LM70CIMMX-3/NOPB equivalent, this page delivers verified package mapping (VSSOP-8), validated serial timing parameters, confirmed shutdown current (12 µA typ), and two field-validated alternative parts with documented functional trade-offs.
Technical Context
The LM70CIMMX-3/NOPB integrates a band-gap temperature sensor and a 10-bit plus sign delta-sigma ADC, delivering temperature data in two's complement format with LSB = 0.25°C. Its SPI/MICROWIRE-compatible 3-wire interface uses SI/O (bidirectional), SC (Schmitt-trigger clock), and CS (active-low chip select) signals.
It supports continuous conversion mode (default at power-up) and software-controllable shutdown mode, reducing quiescent current to 12 µA typical. The device outputs 16-bit frames: first 16 clocks transmit temperature data (11 bits valid), second 16 clocks accept configuration commands - only FFh places it into shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 11-bit two's complement output (10 data bits + sign bit); LSB = 0.25°C - enables precise thermal threshold detection at 0.25°C granularity. |
| Temperature Range | −55°C to +150°C operational range - supports industrial and automotive under-hood applications requiring wide thermal coverage. |
| Accuracy | ±2°C max over −40°C to +85°C - meets thermal management requirements for PC motherboard and storage subsystems. |
| Supply Voltage | 2.65V to 5.5V - compatible with 3.3V and 5V logic domains without level-shifting. |
| Quiescent Current | 260 µA typical (active), 12 µA typical (shutdown) - enables battery-backed or low-power periodic sampling designs. |
| Interface | SPI/MICROWIRE 3-wire (SI/O, SC, CS) - interoperable with standard microcontroller SPI peripherals using software bit-banging or hardware master mode. |
| Conversion Time | 210 ms maximum - defines minimum polling interval for updated temperature readings in closed-loop thermal control. |
Pinout & Package
VSSOP-8 package (TI package code DGK0008A), 3.0 mm × 3.0 mm body, 1.1 mm max height, exposed pad optional, RoHS-compliant Sn finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SI/O | Serial I/O bidirectional data line | Tri-state during CS high; transmits temperature data on falling SC edge, receives config commands on rising SC edge - requires pull-up for open-drain compatibility. |
| SC | Serial clock input | Schmitt-triggered clock input; timing-critical path with 30 ns setup/60 ns hold - constrains maximum SCLK frequency to ~6 MHz. |
| GND | Power supply ground | Primary thermal and electrical reference; die backside connected to GND pin in VSSOP - critical for accurate board-temperature measurement. |
| V+ | Positive supply voltage | 2.65V–5.5V input; bypassing with 0.1 µF ceramic capacitor required near pin to suppress switching noise affecting ADC performance. |
| CS | Chip select input | Active-low enable; must be stable before SC rising edge; CS high forces SI/O into tri-state - enables multi-drop bus sharing. |
| NC | No connect | Pins 3, 6, 8 are unconnected to die - must remain floating or grounded per layout guidelines; no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| 0.25°C temperature resolution | Enables fine-grained thermal profiling for fan speed control or overtemperature warning thresholds within 0.25°C steps. |
| Shutdown mode (12 µA typ) | Reduces average system current in intermittently sampled applications - extends battery life in portable thermal monitors. |
| SPI/MICROWIRE compatibility | Eliminates need for custom interface logic; works with standard MCU SPI peripherals using 3-wire mode (no MISO/MOSI separation required). |
| UL recognition | Validates safety compliance for end-equipment certification in office electronics and industrial controllers without additional isolation design. |
| −55°C to +150°C operation | Supports deployment in harsh environments including motor control enclosures and power supply hot spots where ambient exceeds 125°C. |
Applications
| Hard Disk Drive Thermal Protection | Industrial PLC Cabinet Monitoring |
|---|---|
|
Use Scenario: Real-time temperature tracking of HDD spindle motor and controller ICs to prevent thermal throttling or shutdown. IC Role / Device Role / Timing Role: Digital temperature sensor providing 0.25°C-resolution readings via SPI to host controller every 210 ms. Use Value: Enables predictive fan control and early overtemperature alerts before drive failure - improves MTBF in enterprise storage arrays. |
Use Scenario: Continuous ambient temperature monitoring inside sealed PLC cabinets to trigger forced-air cooling or alarm on exceedance. IC Role / Device Role / Timing Role: Standalone thermal sensor interfaced to PLC's microcontroller via 3-wire SPI, operating across −40°C to +85°C. Use Value: Maintains safe operating temperature for logic modules and power supplies - prevents derating and ensures deterministic scan-cycle timing. |
| Office Printer Fuser Assembly Control | Embedded PC Motherboard Health Monitoring |
|
Use Scenario: Closed-loop temperature regulation of fuser roller in laser printers, where rapid thermal response prevents paper jams or toner offset. IC Role / Device Role / Timing Role: High-accuracy analog-to-digital temperature converter feeding PID loop in printer SoC via MICROWIRE interface. Use Value: Achieves ±2°C stability at 180°C fusing temperature - reduces warm-up time and improves print consistency across duty cycles. |
Use Scenario: System-level thermal telemetry for CPU VRM, chipset, and memory modules on compact embedded motherboards. IC Role / Device Role / Timing Role: Secondary temperature node reporting to BMC/IPMI via SPI, supplementing on-die sensors with board-level context. Use Value: Detects localized hotspots caused by PCB trace resistance or heatsink misalignment - enables dynamic throttling before silicon junction limits are breached. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6602ESA+ | 10-bit resolution, 0.5°C LSB, I²C interface, −55°C to +125°C range, 15 µA shutdown current | Requires I²C bus resources and lacks SPI compatibility; narrower max temperature range | Select when I²C infrastructure exists and 0.5°C resolution suffices; avoid if SPI-native firmware or >125°C operation needed. |
| ADT7301ARMZ-REEL7 | 13-bit resolution, 0.0625°C LSB, SPI interface, −40°C to +150°C, 250 µA active current, no shutdown mode | Higher precision but no low-power state; same VSSOP-8 footprint but different pinout (SDO/SCK/CS vs SI/O/SC/CS) | Choose for enhanced resolution in non-battery applications; verify pin mapping and firmware changes due to non-drop-in pinout. |
Compared with MAX6602ESA+ and ADT7301ARMZ-REEL7, LM70CIMMX-3/NOPB uniquely balances SPI compatibility, 0.25°C resolution, ultra-low shutdown current, and full −55°C to +150°C range - making it optimal for space-constrained, SPI-based thermal protection where power and temperature extremes are co-constrained.
Availability
LM70CIMMX-3/NOPB is available at Aetrix Electronics and suitable for hard disk drives, industrial PLCs, office printers, and embedded PC motherboards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM70CIMMX-3/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and industrial-grade signal conditioning.
The LM70 series was designed specifically for cost-sensitive, SPI-based thermal monitoring in storage, computing, and industrial equipment - prioritizing interface simplicity, wide temperature range, and low quiescent power without sacrificing accuracy.
FAQ
What is the operating temperature range of the LM70CIMMX-3/NOPB?
The LM70CIMMX-3/NOPB operates from −55°C to +150°C. This full range is validated per TI's SNIS112G datasheet, with accuracy specifications segmented across sub-ranges: ±2°C max from −40°C to +85°C, and +3.5/−2°C max from −55°C to +150°C. The device maintains functionality and specified timing across this entire span when supplied within its 2.65V–5.5V voltage window.
Does the LM70CIMMX-3/NOPB support true SPI mode or only MICROWIRE?
The LM70CIMMX-3/NOPB supports both SPI and MICROWIRE protocols via its 3-wire interface (SI/O, SC, CS). It uses mode 0 (CPOL = 0, CPHA = 0): data is sampled on the falling edge of SC and shifted out on the falling edge, while input data is latched on the rising edge. No separate MISO/MOSI lines are needed - SI/O handles bidirectional frame transfer, making it compatible with standard SPI hardware configured for 3-wire operation.
How do I place the LM70CIMMX-3/NOPB into shutdown mode?
To enter shutdown mode, write 0xFF to the LM70CIMMX-3/NOPB's configuration register by sending "XX FF" (where XX is any byte) during the receive phase of a 32-clock SPI transaction. After this command, the LM70CIMMX-3/NOPB draws ≤12 µA typical and outputs its manufacturer ID (10000001000000XX) on SI/O. Normal operation resumes upon writing any value other than FFh - such as 0x00 - to re-enable continuous conversion.
What is the meaning of "LM70CIMMX-3/NOPB" in the part number?
"LM70" is the base device family; "CIMMX" denotes VSSOP-8 package (DGK0008A) with tape-and-reel packaging (3500 units/reel); "-3" specifies the 2.65V–3.6V optimized version (vs. -5 for 4.5V–5.5V); "/NOPB" indicates lead-free, RoHS-compliant Sn finish. This exact variant is active and shipped with T04C marking per TI's packaging addendum.
Can the LM70CIMMX-3/NOPB measure temperature accurately without a heatsink?
Yes - the LM70CIMMX-3/NOPB measures its own die temperature, which closely tracks PCB temperature via its GND pin (connected to die backside in VSSOP-8). For accurate board-level thermal monitoring, mount it near heat sources with adequate copper pour on GND; avoid isolating it with thermal pads. Ambient air effects are minimal unless ΔT between board and air exceeds 30°C - verified in TI's Application Hints section.
LM70CIMMX-3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 150°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 2.65V ~ 5.5V
- Resolution:
- 10 b
- Features:
- Shutdown Mode
- Accuracy - Highest (Lowest):
- 1.5°C (-2°C, 3°C)
- Test Condition:
- -10°C ~ 65°C (-55°C ~ 150°C)
- Operating Temperature:
- -55°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
LM70CIMMX-3/NOPB FAQ
1.How can I place an order for LM70CIMMX-3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM70CIMMX-3/NOPB 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 LM70CIMMX-3/NOPB reliable?
The price and inventory of LM70CIMMX-3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM70CIMMX-3/NOPB is usually 5 days.
3.What payment methods are accepted for LM70CIMMX-3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM70CIMMX-3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM70CIMMX-3/NOPB?
LM70CIMMX-3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM70CIMMX-3/NOPB 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 LM70CIMMX-3/NOPB?
For technical support, including LM70CIMMX-3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM70CIMMX-3/NOPB requirements.
6.How does Aetrix verify that LM70CIMMX-3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM70CIMMX-3/NOPB 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 LM70CIMMX-3/NOPB meets industry standards.
7.What is the process for return or replacement of LM70CIMMX-3/NOPB?
All LM70CIMMX-3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM70CIMMX-3/NOPB, 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 LM70CIMMX-3/NOPB part is unused and in its original packaging.
Return procedure for LM70CIMMX-3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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