DS56

DS56 DALLAS | Alldatasheet

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Technical content

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/temperature- sensitive environments. PIN ASSIGNMENT PIN DESCRIPTION VREF - Bandgap Voltage Reference Output VT2 - Temperature Trip Point 2 VT1 - Temperature Trip Point 1 GND - Ground VTEMP - Temp Sensor Output Voltage TOUT2 - Thermostat output for Trip Point 2 TOUT1 - Thermostat output for Trip Point 1 VDD - 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. DS56 Dual Temperature Comparator PRELIMINARY www.dalsemi.com VDD TOUT1 TOUT2 VTEMP VREF VT2 VT1 GND DS56S 8-Pin SOIC (150-mil)

DETAILED PIN DESCRIPTION Table 1 PIN SYMBOL TYPE DESCRIPTION 1 VREF Analog output Bandgap output 1.25V (nom) voltage reference output. 2 VT2 Analog input Trip point 2 input associated with thermostat output 2. 3 VT1 Analog input Trip point 1 input associated with thermostat output 1. 4 GND GND Ground pin. 5 VTEMP Analog output Temperature sensor output. (+6.2 TDegC + 395) mV.

6 TOUT2

(open-drain) Thermostat output 2. Active low output corresponding to trip point 2. Typical hysteresis is 5.0°C.

7 TOUT1

(open-drain) Thermostat output 1. Active low output corresponding to trip point 1. Typical hysteresis is 5.0°C. 8 VDD VDD Supply Voltage 2.7V - 5.5V input power pin. DS56 FUNCTIONAL BLOCK DIAGRAM Figure 1

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 V TEMP 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 V TEMP 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

ABSOLUTE MAXIMUM RATINGS* Voltage on VDD (GND-0.3V) to +7.0V Input Current at any pin 5.0 mA Package Input Current 20 mA Operating Temperature -40°C to +125°C Storage Temperature -55°C to 150°C ESD Susceptibility (Human Body Model) 1kV Soldering Temperature (Note 2) 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 SYMBOL CONDITION MIN TYP MAX UNITS NOTES Supply Voltage VDD 2.7 5.5 V 1 DC ELECTRICAL CHARACTERISTICS: Power Supply (Note 3) (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES Supply Current IDD 225 µA DC ELECTRICAL CHARACTERISTICS: Temperature Sensor (Note 3) (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES -40°C≤TA≤125°C ±3Trip Point Accuracy TPERR 0°C≤TA≤85°C ±2 °C 4 -40°C≤TA≤125°C ±3VTEMP Accuracy TERR 0°C≤TA≤85°C ±2 °C 5 VTEMP DC Offset T=0°C 395 mV Sensor Gain ? V/? T 6.25 mV/°C Trip Point Hysteresis TPHYST 3.0 5.0 7.0 °C 2.7V≤VDD≤3.3V ±2.3 mVPower Supply Regulation 3.0V≤VDD≤5.5V ±0.3 mV/V VTEMP Output Impedance 1500 Ω

DC ELECTRICAL CHARACTERISTICS: Bandgap Voltage Reference V REF (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES VREF Output VREF 1.238 1.25 1.263 V 2.7V≤VDD≤3.3V ±1.45 mVPower Supply Regulation ? VREF/ ? VDD 30V≤VDD≤5.5V ±0.2 mV/V Load Regulation ? VREF/ ? IL +3.0µA≤IL≤ +50µA 0.15 mV/µA DC ELECTRICAL CHARACTERISTICS: Trip Point Inputs VT1/VT2 (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES Input Bias Current IBIAS 300 nA Input Range VTIN 0 (VDD -1.0) V DC ELECTRICAL CHARACTERISTICS: Thermostat Outputs TOUT1/TOUT2 (-40°C to +125°C; 2.7V ≤ VDD ≤ 5.5V) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES Logic 1 Output Leakage Current IOUT1 VDD = 5.0V 1.0 µA LOGICAL 0 Output Voltage VOUT0 IOUT = +50 µA 0.4 V 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 V DD = 3.0V, thus taking into account sensor error, DC offset error, sensor amplifier gain variations, and amplifier nonlinearity. TYPICAL DS56 THERMOMETER ERROR Figure 3 TBD TYPICAL DS56 VTEMP TRANSFER FUNCTION Figure 4 TBD

8-, 14-, AND 16-PIN SOIC (.150” BODY WIDTH) PKG 8-PIN 14-PIN 16-PIN DIM MIN MAX MIN MAX MIN MAX A IN. MM 0.053 1.35 0.069 1.75 0.053 1.35 0.069 1.75 0.053 1.35 0.069 1.75 A1 IN. MM 0.004 0.10 0.010 0.25 0.004 0.10 0.010 0.25 0.004 0.10 0.010 0.25 A2 IN. MM 0.048 1.24 0.062 1.57 0.048 1.24 0.062 1.57 0.048 1.24 0.062 1.57 b IN. MM 0.012 0.030 0.020 0.50 0.012 0.30 0.020 0.50 0.012 0.30 0.020 0.50 C IN. MM 0.007 0.17 0.011 0.28 0.007 0.17 0.011 0.28 0.007 0.17 0.011 0.28 D IN. MM 0.188 4.78 0.196 4.98 0.337 8.55 0.344 8.74 0.386 9.80 0.393 9.98 e IN. MM

0.050 BSC

1.27 BSC

E1 IN. MM 0.150 3.81 0.158 4.01 0.150 3.81 0.158 4.01 0.150 3.81 0.158 4.01 H IN. MM 0.230 5.84 0.244 6.20 0.230 5.84 0.244 6.20 0.230 5.84 0.244 6.20 L IN. MM 0.016 0.40 0.050 0.89 0.016 0.40 0.050 0.89 0.016 0.40 0.050 0.89