Overview
The LM95235QEIMMX from Texas Instruments is an advanced 11-bit digital temperature sensor designed to monitor both remote and local temperatures with high accuracy. It features a 2-wire System Management Bus (SMBus) interface and employs TruTherm BJT beta compensation technology, allowing it to precisely monitor thermal diodes in 90 nm and smaller geometry processes. This sensor is particularly useful for monitoring the temperature of external devices such as microprocessors, graphics processors, or diode-connected MMBT3904 transistors. The LM95235QEIMMX is also available in an automotive-grade version, the LM95235Q, which is AEC-Q100 Grade 3 compliant and manufactured on an Automotive Grade Flow.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 3.0 to 3.6 V |
| Supply Current (Conv. Rate = 1 Hz) | 350 µA (typ) |
| Remote Diode Temperature Accuracy | TA = 25°C to 85°C; TD = 60°C to 100°C, ±0.75 °C (max) TA = 25°C to 90°C; TD = 40°C to 125°C, ±1.5 °C (max) |
| Local Temperature Accuracy | TA = 25°C to 100°C, ±2.0 °C (max) |
| Conversion Rate, Both Channels | 16 to 0.4 Hz |
| Package | 8-Pin VSSOP |
Key Features
- Remote and Local Temperature Channels
- TruTherm BJT Beta Compensation Technology
- Diode Model Selection Bit - MMBT3904 or 65/90-nm Processor Diodes
- Digital Filter for Remote Channel
- Programmable TCRIT and OS Thresholds
- Programmable Shared Hysteresis Register
- Diode Fault Detection
- Mask, Offset, and Status Registers
- SMBus 2.0 Compatible Interface, Supports TIMEOUT
- Programmable Conversion Rate for Best Power Consumption
- Three-Level Address Pin
- Standby Mode One-Shot Conversion Control
- Pin-for-Pin Compatible With the LM86 and LM89
Applications
- Processor/Computer System Thermal Management (For Example, Laptops, Desktops, Workstations, Servers)
- Electronic Test Equipment and Office Electronics
- Automotive Applications (LM95235Q is AEC-Q100 Grade 3 Compliant)
Q & A
- What is the supply voltage range for the LM95235QEIMMX?
The supply voltage range is 3.0 to 3.6 V. - What is the typical supply current at a conversion rate of 1 Hz?
The typical supply current is 350 µA. - What is the temperature accuracy for the remote diode channel?
The temperature accuracy is ±0.75 °C (max) for TA = 25°C to 85°C; TD = 60°C to 100°C, and ±1.5 °C (max) for TA = 25°C to 90°C; TD = 40°C to 125°C. - What is the local temperature accuracy?
The local temperature accuracy is ±2.0 °C (max) for TA = 25°C to 100°C. - What is the conversion rate range for both channels?
The conversion rate range is 16 to 0.4 Hz. - Does the LM95235QEIMMX support SMBus interface?
Yes, it supports SMBus 2.0 interface with TIMEOUT. - Is the LM95235QEIMMX pin-for-pin compatible with other models?
Yes, it is pin-for-pin compatible with the LM86 and LM89. - What is the package type of the LM95235QEIMMX?
The package type is 8-Pin VSSOP. - Is there an automotive-grade version of the LM95235?
Yes, the LM95235Q is AEC-Q100 Grade 3 compliant and manufactured on an Automotive Grade Flow. - What are the temperature formats supported by the LM95235QEIMMX?
The LM95235 reports temperature in two different formats: +127.875°C/-128°C range and 0°C/255°C range.
