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Texas Instruments LM70CIMM-5/NOPB
- Part No.:
- LM70CIMM-5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM70CIMM-5/NOPB.pdf
- Description:
- SENSOR DIGITAL -55C-150C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LM70CIMM-5/NOPB from Texas Instruments is a SPI/MICROWIRE-compatible 10-bit plus sign digital temperature sensor in VSSOP-8 package, delivering 0.25°C resolution over −55°C to +150°C, with ±2°C accuracy (−40°C to +85°C), 260 μA typical supply current, and shutdown mode drawing <12 μA - used for thermal monitoring in hard disk drives and office electronics.
For engineers reviewing the LM70CIMM-5/NOPB datasheet, LM70CIMM-5/NOPB pinout, LM70CIMM-5/NOPB application, or LM70CIMM-5/NOPB equivalent, key selection factors include its SPI/MICROWIRE interface timing compatibility, VSSOP-8 thermal resistance (θJA = 200°C/W), −55°C to +150°C operating range, 2.65V–5.5V supply voltage, and shutdown command protocol (0xFF write).
Technical Context
The LM70CIMM-5/NOPB integrates a band-gap temperature sensor and ΔΣ ADC with 11-bit two's complement output (1 sign + 10 data bits), LSB = 0.25°C. Its serial interface operates as a slave with Schmitt-trigger inputs on SC and SI/O, supporting both SPI (CPOL=0, CPHA=0) and MICROWIRE protocols.
Communication requires 32 clock cycles per full transaction: first 16 clocks read temperature data (MSB-first), next 16 clocks accept configuration writes. The device powers up in continuous conversion mode and supports manufacturer ID readback (0x81xx) during shutdown - all functions validated for VSSOP-8 package with DGK0008A footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 11-bit two's complement (1 sign + 10 temp bits); 0.25°C per LSB - enables precise thermal threshold detection without external scaling. |
| Supply Voltage | 2.65V to 5.5V - compatible with 3.3V and 5V logic systems; bypassing with 0.1 μF ceramic capacitor required at V+. |
| Supply Current | 260 μA typical (active), 12 μA typical (shutdown) - allows battery-backed thermal logging with minimal quiescent drain. |
| Accuracy | ±2°C max (−40°C to +85°C); +3.5/−2°C max (−55°C to +150°C) - specifies worst-case error across full industrial and extended ranges. |
| Conversion Time | 210 ms max - defines minimum interval between valid temperature reads; host may poll at any time, returning last completed result. |
| Interface | SPI/MICROWIRE 3-wire (SI/O, SC, CS); Schmitt-trigger inputs; tri-state outputs - ensures noise immunity and direct connection to MCU GPIO or dedicated SPI peripherals. |
| Operating Range | −55°C to +150°C - validated for harsh environments including disk drive actuator zones and power supply thermal zones. |
Pinout & Package
VSSOP-8 package (DGK0008A), 2.9 mm × 3.1 mm × 1.1 mm body, exposed pad not electrically connected, RoHS-compliant matte tin lead finish, MSL Level-1 (260°C peak reflow, unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SI/O) | Serial I/O bidirectional data line | Tri-state open-drain output / Schmitt-trigger input; carries temperature data (MSB-first) and accepts shutdown commands (0xFF). |
| 2 (SC) | Serial clock input | Schmitt-triggered; falling edge clocks data out, rising edge clocks data in; min period 0.16 μs supports >6 MHz operation. |
| 3, 6, 8 (NC) | No connect | Internally unconnected; must remain floating - no PCB trace or solder mask opening required. |
| 4 (GND) | Power supply ground | Main thermal path to die; connects to backside of silicon - critical for accurate board-temperature measurement. |
| 5 (V+) | Positive supply voltage | 2.65V–5.5V input; requires local 0.1 μF ceramic decoupling to minimize noise-induced conversion errors. |
| 7 (CS) | Chip select input | Active-low enable; initiates communication; high state forces SI/O into tri-state - enables multi-drop bus sharing. |
Key Features
| Feature | Design Value |
|---|---|
| 0.25°C temperature resolution | Enables detection of sub-degree thermal drift in CPU VRMs or SSD controller thermal throttling thresholds. |
| Shutdown mode (<12 μA) | Reduces average system power in intermittently sampled applications like environmental data loggers. |
| SPI/MICROWIRE compatibility | Eliminates need for protocol translation logic - directly interfaces with TI MSP430, ST STM32, and NXP Kinetis MCUs. |
| UL recognition | Validated for use in end-equipment requiring UL 60950-1 compliance without additional isolation components. |
| −55°C to +150°C operation | Supports placement near power MOSFETs, motor drivers, or optical drive laser diodes without derating. |
Applications
| Hard Disk Drive Thermal Protection | Office Equipment Power Supply Monitoring |
|---|---|
|
Use Scenario: Real-time temperature tracking of HDD spindle motor driver ICs and preamplifier ASICs during sustained read/write operations. IC Role / Device Role / Timing Role: Digital temperature sensor providing 11-bit two's complement output via SPI to host controller every 210 ms. Use Value: Enables dynamic spin-down or write-caching disable before reaching 70°C junction limit - prevents thermal-induced head crash or data corruption. |
Use Scenario: Continuous monitoring of DC-DC converter MOSFET and inductor temperature in multifunction printer power supplies. IC Role / Device Role / Timing Role: SPI-connected thermal sensor feeding temperature data to system microcontroller for fan speed control and overtemperature shutdown. Use Value: Maintains power stage reliability at ambient temperatures up to 50°C by triggering forced-air cooling at 95°C - extends electrolytic capacitor lifetime by 50%. |
| Industrial PC System Management | Electronic Test Equipment Calibration Stability |
|
Use Scenario: Embedded thermal sensing within IPC chassis to monitor CPU heatsink baseplate and chipset VRM temperature gradients. IC Role / Device Role / Timing Role: Temperature sensor with 0.25°C resolution reporting to BMC via dedicated SPI bus, synchronized to system watchdog timer. Use Value: Detects localized hot spots caused by airflow blockage or thermal interface degradation - triggers alarm before exceeding 105°C safe operating limit. |
Use Scenario: Reference temperature node inside automated test equipment (ATE) mainframe to compensate for thermal drift in precision DAC/ADC calibration routines. IC Role / Device Role / Timing Role: High-accuracy sensor (±2°C over −40°C to +85°C) providing real-time die temperature to calibration firmware. Use Value: Reduces measurement uncertainty by 0.5 LSB in 16-bit analog measurements when ambient varies ±15°C - meets ISO/IEC 17025 stability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6602ASA+ | 12-bit resolution (0.0625°C), I²C interface only, 3.0V–5.5V supply, ±1.5°C accuracy (−40°C to +125°C) | Requires I²C bus resources and pull-up resistors; better resolution but narrower accuracy spec at extremes | Select when higher resolution and I²C availability outweigh SPI compatibility needs. |
| ADT7301ARMZ-REEL7 | 13-bit resolution (0.03125°C), SPI interface, 2.7V–5.5V supply, ±0.5°C accuracy (−40°C to +125°C), internal 2.5V reference | Higher accuracy and resolution but larger MSOP-8 package (3 mm × 4.9 mm vs. VSSOP-8's 2.9 mm × 3.1 mm) | Select when metrology-grade accuracy is required and board space permits larger footprint. |
Compared with MAX6602ASA+ and ADT7301ARMZ-REEL7, the LM70CIMM-5/NOPB offers optimal trade-off of SPI compatibility, compact VSSOP-8 size, and wide −55°C to +150°C range - making it preferred for space-constrained thermal protection in storage and power systems where 0.25°C resolution suffices.
Availability
LM70CIMM-5/NOPB is available at Aetrix Electronics and suitable for hard disk drives, office electronics power supplies, and industrial PC thermal management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM70CIMM-5/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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and consumer markets.
The LM70CIMM-5/NOPB belongs to TI's precision analog temperature sensor product line, engineered specifically for low-power, SPI-based thermal monitoring in space-constrained embedded systems where wide operating range and proven reliability are critical.
FAQ
What is the operating temperature range of the LM70CIMM-5/NOPB?
The LM70CIMM-5/NOPB operates from −55°C to +150°C, with specified accuracy limits across sub-ranges: ±2°C maximum error from −40°C to +85°C, and +3.5/−2°C maximum error across the full −55°C to +150°C span. This range is validated per the SNIS112G datasheet and applies specifically to the VSSOP-8 packaged LM70CIMM-5/NOPB variant.
Does the LM70CIMM-5/NOPB support both SPI and MICROWIRE interfaces?
Yes, the LM70CIMM-5/NOPB supports both SPI and MICROWIRE protocols using the same 3-wire interface (SI/O, SC, CS). It operates as a slave with CPOL=0 and CPHA=0 timing, and its Schmitt-trigger inputs ensure robust operation in electrically noisy environments - confirmed in the functional description and timing diagrams of the LM70CIMM-5/NOPB datasheet.
How do I place the LM70CIMM-5/NOPB into shutdown mode?
To enter shutdown mode, write 0xFF to the LM70CIMM-5/NOPB via its serial interface - specifically, transmit "XX FF" (where XX is any byte) during the write phase of a 32-clock transaction. Upon shutdown, supply current drops to ≤12 μA typical, and subsequent reads return the manufacturer ID (0x81xx). This behavior is defined in the Configuration Register section of the LM70CIMM-5/NOPB datasheet.
What is the thermal resistance (θJA) of the LM70CIMM-5/NOPB in its VSSOP-8 package?
The LM70CIMM-5/NOPB in VSSOP-8 package has a junction-to-ambient thermal resistance (θJA) of 200°C/W when mounted on a standard PCB with 2 oz. copper foil, as documented in the Operating Ratings section of the LM70CIMM-5/NOPB datasheet. This value assumes no thermal vias or heatsinking - actual performance improves with added copper area or thermal pads.
Is the LM70CIMM-5/NOPB RoHS compliant?
No, the LM70CIMM-5/NOPB is marked as "No" for RoHS compliance in TI's official packaging addendum, unlike active variants such as LM70CIMMX-5/NOPB. This reflects its obsolete status and legacy lead finish - verified in the PACKAGE OPTION ADDENDUM table where LM70CIMM-5/NOPB shows "No" under RoHS column.
LM70CIMM-5/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:
- Obsolete
- 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
LM70CIMM-5/NOPB FAQ
1.How can I place an order for LM70CIMM-5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM70CIMM-5/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 LM70CIMM-5/NOPB reliable?
The price and inventory of LM70CIMM-5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM70CIMM-5/NOPB is usually 5 days.
3.What payment methods are accepted for LM70CIMM-5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM70CIMM-5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM70CIMM-5/NOPB?
LM70CIMM-5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM70CIMM-5/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 LM70CIMM-5/NOPB?
For technical support, including LM70CIMM-5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM70CIMM-5/NOPB requirements.
6.How does Aetrix verify that LM70CIMM-5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM70CIMM-5/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 LM70CIMM-5/NOPB meets industry standards.
7.What is the process for return or replacement of LM70CIMM-5/NOPB?
All LM70CIMM-5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM70CIMM-5/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 LM70CIMM-5/NOPB part is unused and in its original packaging.
Return procedure for LM70CIMM-5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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