Overview
The LM70CIMM-3/NOPB is a temperature sensor produced by Texas Instruments, incorporating a Delta-Sigma analog-to-digital converter (ADC) with an SPI and MICROWIRE compatible interface. This device is designed for precise temperature measurement and is available in an 8-pin VSSOP package. It operates over a wide temperature range of −55°C to +150°C and offers a high resolution of 0.25°C per least significant bit (LSB). The LM70 is ideal for various applications requiring accurate thermal management and low power consumption.
Key Specifications
| Parameter | Typical | Maximum | Units |
|---|---|---|---|
| Supply Voltage | 2.65V to 5.5V | V | |
| Supply Current - Operating | 260 μA | 490 μA | μA |
| Supply Current - Shutdown | 12 μA | μA | |
| Temperature Accuracy | ±2°C (−40°C to +85°C) | °C | |
| +1.5/−2°C (−10°C to +65°C) | °C | ||
| +3/−2°C (−55°C to +125°C) | °C | ||
| +3.5/−2°C (−55°C to +150°C) | °C | ||
| Resolution | 11 bits | bits | |
| Temperature Conversion Time | 140 ms | 210 ms | ms |
| Package Type | VSSOP-8 |
Key Features
- High Resolution: 0.25°C per LSB with 10-bit plus sign temperature resolution.
- Wide Operating Range: Temperature range of −55°C to +150°C.
- Low Power Consumption: Shutdown mode reduces power consumption to less than 10 μA.
- Simple Interface: SPI and MICROWIRE compatible interface for easy communication with microcontrollers and processors.
- Compact Packaging: Available in VSSOP-8 and WSON-8 packages to save space.
- UL Recognized Component: Meets UL standards for safety and reliability.
Applications
- System Thermal Management: Ideal for monitoring and managing temperature in various systems.
- Personal Computers: Used in thermal management and protection in PC systems.
- Disk Drives: Employed in hard disk drives for temperature monitoring and protection.
- Office Electronics: Suitable for thermal management in office equipment such as printers and scanners.
- Electronic Test Equipment: Used in test and measurement equipment for precise temperature monitoring.
Q & A
- What is the temperature resolution of the LM70CIMM-3/NOPB?
The LM70CIMM-3/NOPB has a temperature resolution of 0.25°C per LSB.
- What is the operating temperature range of the LM70CIMM-3/NOPB?
The device operates over a temperature range of −55°C to +150°C.
- What are the supply voltage and current specifications for the LM70CIMM-3/NOPB?
The supply voltage range is 2.65V to 5.5V, and the typical operating current is 260 μA, with a maximum of 490 μA.
- How does the shutdown mode affect power consumption?
In shutdown mode, the power consumption is reduced to less than 10 μA.
- What types of interfaces does the LM70CIMM-3/NOPB support?
The device supports SPI and MICROWIRE compatible interfaces.
- What is the package type of the LM70CIMM-3/NOPB?
The device is available in an 8-pin VSSOP package.
- What are some common applications of the LM70CIMM-3/NOPB?
Common applications include system thermal management, personal computers, disk drives, office electronics, and electronic test equipment.
- How accurate is the temperature measurement of the LM70CIMM-3/NOPB?
The temperature accuracy varies by range but is typically ±2°C from −40°C to +85°C and +1.5/−2°C from −10°C to +65°C.
- Can the LM70CIMM-3/NOPB be read at any time?
Yes, the LM70 can be read at any time without regard to the conversion state, and it will yield the last conversion result.
- What is the thermal resistance (θJA) of the LM70CIMM-3/NOPB when attached to a PCB?
The thermal resistance (θJA) varies depending on the package and PCB configuration, but for VSSOP packages, it is typically around 200°C/W.
