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DS56 Dataheets PDF



Part Number DS56
Manufacturers Dallas Semiconducotr
Logo Dallas Semiconducotr
Description Dual Temperature Comparator
Datasheet DS56 DatasheetDS56 Datasheet (PDF)

PRELIMINARY DS56 Dual Temperature Comparator www.dalsemi.com FEATURES § 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 ≤ .

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PRELIMINARY DS56 Dual Temperature Comparator www.dalsemi.com FEATURES § 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 VT2 VT1 GND 1 2 3 4 8 7 6 5 VDD TOUT1 TOUT2 VTEMP 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 102299 DS56 DETAILED PIN DESCRIPTION Table 1 PIN 1 2 3 4 5 6 7 8 SYMBOL VREF VT2 VT1 GND VTEMP TOUT2 TOUT1 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. DS56 FUNCTIONAL BLOCK DIAGRAM Figure 1 2 of 6 102299 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 3 of 6 102299 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 .


DS55493 DS56 DS56-0001


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