DS56S

DS56 Dual Temperature Comparator www.maxim-ic.com FEATURES ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Factory calibrated for sensitivity of +6.20 mV/°C and thermometer accuracy of ±2.0°C over the 0°C to 85°C range and ±3°C over the 40°C to 0°C and +85°C to +125°C range Measurement range of -40°C to +125°C Integrated temperature sensor and voltage reference Two independent temperature setpoints with respective logic outputs with set hysteresis Narrow-body SO8 (150-mil) package Wide power supply range (2.7V ≤ VDD ≤ 5.5V) Functionally compatible with LM56xIM Applications include monitoring disk drives, printers, office equipment, HVAC, appliances, or any power/cost/temperaturesensitive environments. PIN ASSIGNMENT VREF 1 8 VT2 2 7 TOUT1 VT1 3 6 TOUT2 GND 4 5 VTEMP VDD DS56S 8-Pin SOIC (150-mil) PIN DESCRIPTION VREF VT2 VT1 GND VTEMP TOUT2 TOUT1 VDD - Bandgap Voltage Reference Output - Temperature Trip Point 2 - Temperature Trip Point 1 - Ground - Temp Sensor Output Voltage - Thermostat output for Trip Point 2 - Thermostat output for Trip Point 1 - Power Supply Voltage (2.7V to 5.5V) DESCRIPTION The DS56 Dual Temperature Comparator has two independent open-drain thermostat outputs and respective trip point inputs. The trip points are set with external resistors that divide down the 1.25V internal bandgap voltage reference. The voltage resulting from this resistive division is compared with the voltage corresponding to the device’s junction temperature to define the thermostat output logic state. The internal temperature sensor has a typical sensitivity of +6.2mV/°C and DC offset of +395 mV at 0°C. Both thermostat outputs have 5°C of hysteresis. For applications that require temperature measurement as well as control, the temperature sensor voltage is brought out to a pin. The DS56 is packaged in a compact 150-mil, 8-pin SOIC. Applications include disk drives, printers, office equipment, HVAC, appliances, or any power/cost/temperature-sensitive environments. 1 of 6 100606 DS56 ORDER INFORMATION ORDERING NUMBER DS56S DS56S/T&R DS56S+ DS56S+T&R PACKAGE MARKING DS56 DS56 DS56 (See Note) DS56 (See Note) DESCRIPTION DS56 in 150 mil 8-pin SO DS56 in 150 mil 8-pin SO, 2500 Piece Tape-and-Reel DS56 in Lead-Free 150 mil 8-pin SO DS56 in Lead-Free 150 mil 8-pin SO, 2500 Piece Tapeand-Reel Note: A “+” symbol will also be marked on the package near the Pin 1 indicator. DETAILED PIN DESCRIPTION Table 1 PIN 1 2 3 4 5 SYMBOL VREF VT2 VT1 GND VTEMP 6 TOUT2 7 TOUT1 8 VDD TYPE Analog output Analog input Analog input GND Analog output Digital output (open-drain) Digital output (open-drain) VDD DESCRIPTION Bandgap output 1.25V (nom) voltage reference output. Trip point 2 input associated with thermostat output 2. Trip point 1 input associated with thermostat output 1. Ground pin. Temperature sensor output. (+6.2 TDegC + 395) mV. Thermostat output 2. Active low output corresponding to trip point 2. Typical hysteresis is 5.0°C. Thermostat output 1. Active low output corresponding to trip point 1. Typical hysteresis is 5.0°C. Supply Voltage 2.7V - 5.5V input power pin. 2 of 7 DS56 DS56 FUNCTIONAL BLOCK DIAGRAM Figure 1 3 of 7 DS56 OVERVIEW A block diagram of the DS56 is shown in Figure 1. The DS56 consists of three major components: 1. Precision bandgap voltage reference 2. Temperature sensor 3. Thermostat comparators The DS56 incorporates an internal temperature sensor with a typical transfer function of (in mV with T expressed in °C): VTEMP (T) = 6.2 T + 395 The voltage associated with this transfer function is output on the VTEMP pin, which has a typical output impedance of 1.5 kΩ. The DS56 has two independent temperature comparators, each with its own input (or trip point) and output. The comparison voltage (the VTEMP transfer function) is the same for both comparators. Additionally, the hysteresis for both comparators is typically 5°C (31.0 mV). The DS56 bandgap voltage reference is available on pin 1 to allow for a designer to set the trip point(s) by resistively dividing the reference voltage. One possible scenario is illustrated in Figure 1. For optimum performance, the VREF pin should be connected to a 50 µA load. The comparator outputs are taken off-chip via open-drain FETs, thus requiring external pullups. The thermostat transfer function is illustrated in Figure 2. The supply range of the DS56 is 2.7V to 5.5V, allowing for applications ranging from industrial control to battery-powered portable equipment. THERMOSTAT OUTPUT TRANSFER FUNCTION Figure 2 4 of 7 DS56 ABSOLUTE MAXIMUM RATINGS* Voltage on VDD Input Current at any pin Package Input Current Operating Temperature Storage Temperature ESD Susceptibility (Human Body Model) Soldering Temperature (Note 2) * (GND-0.3V) to +7.0V 5.0 mA 20 mA -40°C to +125°C -55°C to 150°C 1kV 215°C for 60 seconds (Vapor Phase) 220°C for 15 seconds (IR) This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. The Dallas Semiconductor DS56 is built to the highest quality standards and manufactured for long-term reliability. All Dallas Semiconductor devices are made using the same quality materials and manufacturing methods. However, the DS56 is not exposed to environmental stresses, such as burn-in, that some industrial applications require. For specific reliability information on this product, please contact the factory in Dallas at (972) 371-4448. RECOMMENDED DC OPERATING CONDITIONS: (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) PARAMETER Supply Voltage SYMBOL VDD CONDITION DC ELECTRICAL CHARACTERISTICS: Power Supply (Note 3) PARAMETER Supply Current SYMBOL IDD CONDITION DC ELECTRICAL CHARACTERISTICS: Temperature Sensor (Note 3) PARAMETER Trip Point Accuracy VTEMP Accuracy VTEMP DC Offset Sensor Gain Trip Point Hysteresis Power Supply Regulation VTEMP Output Impedance SYMBOL TPERR TERR CONDITION MIN 2.7 TYP MAX 5.5 MIN TYP MAX 225 TYP MAX ±3 ±2 ±3 ±2 395 6.25 ∆V/∆T 3.0 5 of 7 UNITS µA NOTES (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) MIN T=0°C 2.7V≤VDD≤3.3V 3.0V≤VDD≤5.5V NOTES 1 (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) -40°C≤TA≤125°C 0°C≤TA≤85°C -40°C≤TA≤125°C 0°C≤TA≤85°C TPHYST UNITS V 5.0 UNITS NOTES °C 4 °C 5 mV mV/°C 7.0 °C ±2.3 ±0.3 mV mV/V 1500 Ω DS56 DC ELECTRICAL CHARACTERISTICS: Bandgap Voltage Reference VREF PARAMETER VREF Output Power Supply Regulation Load Regulation SYMBOL VREF 2.7V≤VDD≤3.3V MAX 1.263 ±1.45 UNITS V mV ∆VDD 30V≤VDD≤5.5V ±0.2 mV/V ∆VREF/ +3.0µA≤IL≤ +50µA 0.15 mV/µA ∆VREF/ CONDITION ∆IL DC ELECTRICAL CHARACTERISTICS: Trip Point Inputs VT1/VT2 PARAMETER Input Bias Current Input Range SYMBOL IBIAS CONDITION VTIN MIN 1.238 TYP 1.25 SYMBOL CONDITION IOUT1 VOUT0 NOTES (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) MIN TYP 0 DC ELECTRICAL CHARACTERISTICS: Thermostat Outputs TOUT1/TOUT2 PARAMETER Logic 1 Output Leakage Current LOGICAL 0 Output Voltage (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) MAX 300 (VDD -1.0) UNITS nA NOTES V (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) MIN TYP MAX UNITS VDD = 5.0V 1.0 µA IOUT = +50 µA 0.4 V NOTES NOTES: 1. All voltages are referenced to ground, unless otherwise specified. 2. Solder according to IPC standards. 3. Specified for VTEMP sourcing 1.0 µA (max) and VREF load current = 50 µA. 4. Includes error associated with internal temperature sensor, bandgap voltage VREF, and comparator offset. External resistance tolerance and temperature coefficient not included in this spec. 5. Thermometer error (expressed in °C) is the difference between [VO(T) - 395]/6.20 and the DS56 case temperature at VDD = 3.0V, thus taking into account sensor error, DC offset error, sensor amplifier gain variations, and amplifier nonlinearity. 6 of 7 DS56 DS56 PHYSICAL DIMENSIONS 8-, 14-, AND 16-PIN SOIC (.150” BODY WIDTH) PKG DIM A IN. MM A1 IN. MM A2 IN. MM b IN. MM C IN. MM D IN. MM e IN. MM E1 IN. MM H IN. MM L IN. MM Θ 8-PIN MIN MAX 0.053 0.069 1.35 1.75 0.004 0.010 0.10 0.25 0.048 0.062 1.24 1.57 0.012 0.020 0.030 0.50 0.007 0.011 0.17 0.28 0.188 0.196 4.78 4.98 0.050 BSC 1.27 BSC 0.150 0.158 3.81 4.01 0.230 0.244 5.84 6.20 0.016 0.050 0.40 0.89 0° 8° 14-PIN MIN MAX 0.053 0.069 1.35 1.75 0.004 0.010 0.10 0.25 0.048 0.062 1.24 1.57 0.012 0.020 0.30 0.50 0.007 0.011 0.17 0.28 0.337 0.344 8.55 8.74 0.050 BSC 1.27 BSC 0.150 0.158 3.81 4.01 0.230 0.244 5.84 6.20 0.016 0.050 0.40 0.89 0° 8° 16-PIN MIN MAX 0.053 0.069 1.35 1.75 0.004 0.010 0.10 0.25 0.048 0.062 1.24 1.57 0.012 0.020 0.30 0.50 0.007 0.011 0.17 0.28 0.386 0.393 9.80 9.98 0.050 BSC 1.27 BSC 0.150 0.158 3.81 4.01 0.230 0.244 5.84 6.20 0.016 0.050 0.40 0.89 0° 8° 7 of 7