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Texas Instruments LM77CIMM-5/NOPB
- Part No.:
- LM77CIMM-5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM77CIMM-5/NOPB.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
LM77CIMM-5/NOPB from Texas Instruments is a 9-bit + sign digital temperature sensor and thermal window comparator with I²C interface, operating from 3.0V to 5.5V, delivering ±1.5°C accuracy over −10°C to +65°C, and featuring separate open-drain INT and T_CRIT_A outputs for system-level thermal management in ACPI-compliant PCs and embedded controllers.
For engineers reviewing the LM77CIMM-5/NOPB datasheet, LM77CIMM-5/NOPB pinout, LM77CIMM-5/NOPB application, or LM77CIMM-5/NOPB equivalent, key selection criteria include its dual-threshold window comparison architecture, programmable hysteresis, fault queue support, and VSSOP-8 package compatibility with space-constrained thermal monitoring designs.
Technical Context
The LM77CIMM-5/NOPB integrates a band-gap temperature sensor, 10-bit ADC, and digital comparator with independently programmable TLOW/THIGH window and T_CRIT critical alarm thresholds. Its I²C slave interface uses a fixed 5-bit address prefix (10010) plus A0/A1 pins for up to four devices on one bus.
It supports two interrupt modes: Comparator mode (output resets after each read and reasserts if condition persists) and Event mode (output asserts once per threshold crossing until manually cleared). The device implements a 4-fault queue to suppress noise-induced false triggers and powers up with default thresholds of TLOW = 10°C, THIGH = 64°C, T_CRIT = 80°C, and THYST = 2°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V - compatible with standard 3.3V and 5V logic rails without level-shifting. |
| Temperature Accuracy | ±1.5°C max (−10°C to +65°C) - meets tight thermal control requirements for CPU and GPU monitoring. |
| Output Resolution | 9-bit + sign (two's complement), 0.5°C LSB - enables precise 0.5°C step detection across −55°C to +125°C range. |
| Conversion Time | 70–125 ms - defines minimum interval between valid temperature updates; supports dynamic thermal response tracking. |
| Quiescent Current | 250 μA typical (active), 5 μA typical (shutdown) - enables low-power thermal supervision in battery-backed or always-on systems. |
| I²C Addressing | 7-bit slave address with A0/A1 pins - allows up to four LM77CIMM-5/NOPB devices on a single bus without address conflict. |
| Hysteresis Control | Programmable THYST register - prevents oscillation near trip points by adding configurable hysteresis to TLOW, THIGH, and T_CRIT thresholds. |
Pinout & Package
VSSOP-8 package (DGK0008A), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional - optimized for compact PCB layouts and thermal performance in high-density applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA | Serial bidirectional data line | Open-drain I²C data interface requiring external pull-up; supports multi-master bus arbitration. |
| SCL | Serial clock input | Asynchronous clock input from host controller; timing compliant with standard-mode I²C (100 kHz). |
| T_CRIT_A | Critical temperature alarm output | Open-drain output asserting when temperature exceeds T_CRIT; used for hardware shutdown independent of processor state. |
| GND | Power supply ground | Reference node for analog sensing and digital logic; must be low-impedance connection to minimize measurement error. |
| INT | Interrupt output | Open-drain output asserting when temperature exits programmable TLOW–THIGH window; configurable polarity and mode. |
| +VS | Positive supply voltage | Accepts 3.0V–5.5V DC; powers internal band-gap sensor, ADC, and digital logic; accuracy degrades ~1°C/V away from nominal. |
| A0, A1 | User-set I²C address inputs | Digital inputs setting two LSBs of 7-bit slave address; tied to GND (0) or +VS (1) to configure unique bus address. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-threshold thermal window comparator | Independent TLOW/THIGH programming enables precise zone-based thermal control without host software polling. |
| Separate critical alarm output (T_CRIT_A) | Dedicated hardware shutdown path bypasses firmware; activates at user-defined T_CRIT to force immediate power-down. |
| Configurable interrupt modes | Comparator mode (auto-reset on read) and Event mode (single-shot assertion) allow flexible host interrupt handling strategies. |
| 4-fault queue filtering | Requires four consecutive out-of-window readings before asserting INT/T_CRIT_A - suppresses transient noise in electrically noisy environments. |
| Shutdown mode with active I²C | Reduces current to 5 μA while retaining full register access - enables background thermal supervision during system sleep states. |
Applications
| Server CPU Thermal Throttling | ACPI-Compliant Laptop Fan Control |
|---|---|
|
Use Scenario: Real-time monitoring of multi-core CPU die temperature during sustained compute loads. IC Role / Device Role / Timing Role: Digital temperature sensor and window comparator providing hardware-triggered throttling signals to CPU power management unit. Use Value: Prevents thermal runaway using T_CRIT_A-driven hardware reset and INT-driven dynamic frequency scaling via BIOS/EC firmware. |
Use Scenario: Adaptive fan speed regulation based on ambient and chassis temperature gradients in ultrabooks. IC Role / Device Role / Timing Role: I²C-connected thermal monitor feeding temperature windows to embedded controller (EC) for PWM fan control. Use Value: Enables silent operation below 55°C and aggressive cooling above 75°C using programmable hysteresis to avoid fan flutter. |
| Industrial PLC Cabinet Overtemperature Protection | Automotive Infotainment SoC Thermal Management |
|
Use Scenario: Monitoring enclosure air temperature in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Standalone thermal watchdog interfacing directly with PLC safety relay via T_CRIT_A output. Use Value: Guarantees fail-safe shutdown at 80°C even if main controller locks up, meeting IEC 61508 functional safety expectations. |
Use Scenario: Die temperature supervision of application processors in head-unit systems operating from −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary thermal sensor feeding SoC thermal management firmware via I²C with 0.5°C resolution. Use Value: Supports ASIL-B–aligned thermal derating by detecting sub-1°C drifts before reaching critical junction limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor and thermal window comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIMM-5/NOPB | Lacks T_CRIT_A output and critical shutdown capability; only single-threshold INT output; no fault queue. | Suitable for basic temperature alerting but not for safety-critical thermal shutdown paths. | Select LM77CIMM-5/NOPB when hardware-initiated critical shutdown or dual-window comparison is required. |
| MAX6625ASA+ | Uses SPI interface instead of I²C; offers higher ±0.5°C accuracy but no programmable hysteresis or fault queue. | Better for precision lab equipment; incompatible with I²C-only host designs and ACPI thermal frameworks. | Choose LM77CIMM-5/NOPB for I²C bus compatibility, ACPI compliance, and integrated hysteresis/fault filtering. |
Compared with LM75BIMM-5/NOPB and MAX6625ASA+, the LM77CIMM-5/NOPB uniquely combines I²C interface, dual-window comparison, dedicated T_CRIT_A hardware shutdown, and 4-fault queue - making it the only option among the three qualified for ACPI-compliant thermal management with fail-safe critical alarm response.
Availability
LM77CIMM-5/NOPB is available at Aetrix Electronics and suitable for server thermal monitoring, laptop ACPI subsystems, industrial PLC cabinet protection, and automotive infotainment SoC thermal management requiring stable component supply and long-term lifecycle support.
Supply support for LM77CIMM-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and power-efficient IC design.
The LM77CIMM-5/NOPB belongs to TI's precision analog temperature sensor product line, engineered specifically for ACPI-compliant thermal monitoring and hardware-based critical shutdown in computing, industrial, and automotive systems.
FAQ
What is the operating temperature range of the LM77CIMM-5/NOPB?
The LM77CIMM-5/NOPB operates across −55°C to +125°C, with specified accuracy of ±1.5°C (max) from −10°C to +65°C, ±2.0°C (max) from −25°C to +100°C, and ±3.0°C (max) over the full range. Its full-scale digital output covers over 128°C, though continuous operation above +125°C is not recommended per TI's operating ratings.
Does the LM77CIMM-5/NOPB support both 3.3V and 5V supply rails?
Yes, the LM77CIMM-5/NOPB is fully specified for operation from 3.0V to 5.5V. It functions correctly at both 3.3V and 5V nominal supplies, though temperature accuracy degrades approximately 1°C per volt deviation from the nominal supply voltage - a behavior documented in the SNIS103F datasheet for LM77CIMM-5/NOPB.
How does the fault queue function in the LM77CIMM-5/NOPB?
The LM77CIMM-5/NOPB implements a 4-fault queue that requires four consecutive out-of-window temperature readings before asserting the INT or T_CRIT_A outputs. Enabled via bit D4 of the Configuration register, this feature minimizes false alarms in electrically noisy environments such as motor drives or switching power supplies - a confirmed behavior for LM77CIMM-5/NOPB per TI's functional description.
What is the default I²C address of the LM77CIMM-5/NOPB?
The LM77CIMM-5/NOPB has a fixed 5-bit I²C address prefix of "10010", with the two least significant bits determined by A0 and A1 pin states. With both A0 and A1 grounded, the full 7-bit slave address is 1001000 (0x48); other combinations yield 0x49, 0x4A, or 0x4B - all verified in the LM77CIMM-5/NOPB serial bus interface section of the official datasheet.
Can the LM77CIMM-5/NOPB operate in shutdown mode while retaining I²C accessibility?
Yes, the LM77CIMM-5/NOPB supports shutdown mode (enabled by setting bit D0 in the Configuration register), reducing supply current to 5 μA typical while keeping the I²C interface fully operational. Registers remain readable and writable, and the device resumes normal conversion within milliseconds upon clearing the shutdown bit - a confirmed capability for LM77CIMM-5/NOPB per TI's Shutdown Mode section.
LM77CIMM-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:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C
- Voltage - Supply:
- 3V ~ 5.5V
- Resolution:
- 9 b
- Features:
- Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±3°C)
- Test Condition:
- -10°C ~ 65°C (-55°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-VSSOP
LM77CIMM-5/NOPB FAQ
1.How can I place an order for LM77CIMM-5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM77CIMM-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 LM77CIMM-5/NOPB reliable?
The price and inventory of LM77CIMM-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 LM77CIMM-5/NOPB is usually 5 days.
3.What payment methods are accepted for LM77CIMM-5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM77CIMM-5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM77CIMM-5/NOPB?
LM77CIMM-5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM77CIMM-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 LM77CIMM-5/NOPB?
For technical support, including LM77CIMM-5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM77CIMM-5/NOPB requirements.
6.How does Aetrix verify that LM77CIMM-5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM77CIMM-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 LM77CIMM-5/NOPB meets industry standards.
7.What is the process for return or replacement of LM77CIMM-5/NOPB?
All LM77CIMM-5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM77CIMM-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 LM77CIMM-5/NOPB part is unused and in its original packaging.
Return procedure for LM77CIMM-5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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