LM95235-Q1 Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus | TI.com

LM95235-Q1 (ACTIVE)

Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus

Automotive Grade, ±2°C Remote and Local Temperature Sensor with TruTherm Technology and SMBus - LM95235-Q1
 

Description

The LM95235 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) interface and TruTherm technology that can monitor the temperature of a remote diode as well as its own temperature. The LM95235 can be used to very accurately monitor the temperature of external devices such as microprocessors, graphics processors, or a diode-connected MMBT3904 transistor. For automotive applications the LM95235Q is available that is AEC-Q100 Grade3 compliant and is manufactured on an Automotive Grade Flow. TruTherm BJT (transistor) beta compensation technology allows the LM95235 to precisely monitor thermal diodes found in 90 nm and smaller geometry processes. LM95235 reports temperature in two different formats for +127.875°C/-128°C range and 0°C/255°C range. The LM95235 T_CRIT and OS outputs are asserted when either unmasked channel exceeds its programmed limit and can be used to shutdown the system, to turn on the system fans, or as a microcontroller interrupt function. The current status of the T_CRIT and OS pins can be read back from the status registers via the SMBus interface. All limits have a shared programmable hysteresis register.

The remote temperature channel of the LM95235 has a programmable digital filter. The LM95235 contains a diode model selection bit to select between a typical Intel® processor on a 65 nm or 90 nm process or MMBT3904, as well as an offset register for maximum flexibility and best accuracy.

The LM95235 has a three-level address pin to connect up to 3 devices to the same SMBus master, that is shared with the OS output. The LM95235 has a programmable conversion rate register and a standby mode to save power. One conversion can be triggered in standby mode by writing to the one-shot register.

Features

  • Remote and Local Temperature Channels
  • TruTherm BJT Beta Compensation Technology
  • LM95235Q is AEC-Q100 Grade 3 Compliant and is Manufactured on an Automotive Grade Flow
  • Diode Model Selection Bit - MMBT3904 or 65/90-nm Processor Diodes
  • Two Formats: -128°C to 127.875°C and 0°C to 255.875°C
  • 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
  • 8-Pin VSSOP Package

Key Specifications

  • 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

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Parametrics Compare all products in Digital Temperature Sensors

 
Device Type
Interface
Local Sensor Accuracy (Max) (+/- C)
Temp Resolution (Max) (bits)
Operating Temperature Range (C)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Max) (uA)
Features
Remote Channels (#)
Addresses
Rating
Package Group
Package Size: mm2:W x L (PKG)
LM95235-Q1 LM95233 LM95234 LM95235 LM95245
Remote     Remote     Remote     Remote     Remote    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
I2C
SMBus    
2     2     2     2     2    
11     11     11     11     11    
-40 to 85     -40 to 140     -40 to 140     -40 to 90
0 to 90    
-40 to 125    
2.7     3     2.7     3     2.7    
5.5     3.6     5.5     5.5     5.5    
350     500     800     650     670    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
One shot conversion control
Programmable Alert
Programmable conversion rate
Remote diode fault detection
Shutdown
Thermal diode input stage filtering    
1     2     4     1     1    
3     3     3     3     3    
Automotive     Catalog     Catalog     Catalog     Catalog    
VSSOP     WSON     WSON     VSSOP     SOIC
VSSOP    
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)     See datasheet (WSON)     See datasheet (WSON)     8VSSOP: 15 mm2: 4.9 x 3(VSSOP)     8SOIC: 29 mm2: 6 x 4.9(SOIC)
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)    

Other qualified versions of LM95235-Q1

Version Part Number Definition
Catalog LM95235 TI's standard catalog product