Digital Temperature Monitors Measures: External Temperature Internal Temperature Single-Ended Voltage Differential Voltage Rail-to-Rail Current Internal VCC LTC2990/LTC2991: Quad/Octal I2C Temperature, Voltage and Current Monitors The LTC®2990/LTC2991 are temperature, voltage and current monitors for 3V to 5.5V systems that integrate a 14-bit ADC, 2 10ppm/°C reference and I C interface to provide sub-millivolt voltage resolution and 1% current measurement, as well as ±1°C accuracy internally and up to ±0.7°C accuracy remotely when making temperature measurements. The LTC2990/LTC2991 use up to eight single-ended inputs to conveniently measure any combination of parameters simultaneously. Temperature and Voltage Total Unadjusted Error Digital Temperature Monitors LTC2991 3V to 5.5V Ext Temp Accuracy (typ) ±0.5°C at –40°C to 85°C ±0.7°C at –40°C to 85°C Int Temp Accuracy (typ) ±1°C at 0°C to 85°C ±1°C at 25°C 0.0625°C 0.0625°C # of Temp Channels 2 4 # of Voltage Channels 4 8 Int Temp Measurement Ext Temp Measurement • • • • Single-Ended Voltage Measurement • • Differential Voltage Measurement • • Int VCC Measurement • • • • I2C I2C 10 Possible Measurement Configurations 35 Measurement Configurations, PWM Output, Digital Filter MSOP-10 MSOP-16 Resolution Ext Current Measurement Interface Comments Package L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1.0 0.75 0.5 ERROR LTC2990 3V to 5.5V Voltage Supply Range TINT (°C) TRX (°C) V1 (%) V1-V2 (%) VCC (%) 0.25 0 –0.25 –0.5 –40 –20 0 20 40 60 TEMPERATURE (°C) 80 100 120 Analog Temperature Monitors LTC2995/LTC2996/LTC2997: Fast, Small and Simple VPTAT Monitoring The LTC®2995/LTC2997/LTC2997 are analog temperature monitors for low voltage systems that provide a 3.5ms-updated voltage proportional to absolute temperature (VPTAT) so that systems can quickly react with subdegree accuracy when making internal or external temperature measurements. The full-featured LTC2995 provides equally impressive high voltage monitoring capabilities for two rails, as well as temperature and voltage alerts, for a truly comprehensive thermal monitoring solution. No code is required to configure these tiny devices. VPTAT vs Remote Diode Temperature Analog Temperature Monitors LTC2995 LTC2996 LTC2997 2.25V to 5.5V 2.25V to 5.5V 2.5V to 5.5V Quiescent Current (typ) 220µA 200µA 170µA Ext Temp Accuracy (typ) ±0.25°C at –40°C to 125°C ±0.25°C at –40°C to 125°C ±0.25°C at –40°C to 100°C Int Temp Accuracy (typ) ±0.5°C at 25°C ±0.5°C at –40°C to 125°C ±0.5°C at –40°C to 85°C # of Temp Channels 1 1 1 # of Voltage Channels 2 Int Temp Measurement • • • • • • • • • • • • • • • • • • • • • 3 × 3 QFN-20 3 × 3 DFN-10 2 × 3 DFN-6 Ext Temp Measurement Series Resistance Cancellation VPTAT Output Overtemperature Output Undertemperature Output Overvoltage Output Undervoltage Output 1.8V Reference Output Package 1.8 1.6 VPTAT (V) Voltage Supply Range 1.4 1.2 1.0 0.8 –50 –25 0 25 50 75 100 125 150 REMOTE DIODE TEMPERATURE (°C) www.linear.com/tempmonitors n 1-800-4-LINEAR 0712B