DS56 ,Dual-Output Thermostat and Analog Temperature SensorPIN DESCRIPTION Table 1PIN SYMBOL TYPE DESCRIPTION1 V Analog output Bandgap output 1.25V (nom) volt ..
DS56 ,Dual-Output Thermostat and Analog Temperature SensorApplications include monitoring disk drives,V - Temp Sensor Output VoltageTEMPprinters, office equi ..
DS56+ ,Dual-Output Thermostat and Analog Temperature Sensorblock diagram of the DS56 is shown in Figure 1. The DS56 consists of three major components:1. Prec ..
DS560001 ,824-960 MHz, Low cost six-way SMT power divider
DS560001 ,824-960 MHz, Low cost six-way SMT power divider
DS560001 ,824-960 MHz, Low cost six-way SMT power divider
ECH8401 ,Medium Output MOSFETsAbsolute Maximum Ratings at Ta=25°CParameter Symbol Conditions Ratings UnitDrain-to-Source Voltage ..
ECH8402 ,Medium Output MOSFETsAbsolute Maximum Ratings at Ta=25°CParameter Symbol Conditions Ratings UnitDrain-to-Source Voltage ..
ECH8402 ,Medium Output MOSFETsOrdering number : ENN8148 ECH8402N-Channel Silicon MOSFETGeneral-Purpose Switching DeviceECH8402App ..
ECH8410 ,N-Channel Power MOSFET, 30V, 12A, 10mOhm, Single ECH8Maximum RatingsParameter Symbol Conditions Ratings UnitDrain-to-Source Voltage V 30 VDSSGate-to-Sou ..
ECH8601 ,Nch+NchAbsolute Maximum Ratings at Ta=25°CParameter Symbol Conditions Ratings UnitDrain-to-Source Voltage ..
ECH8604 ,N CHANNEL MOS SILICON TRANSISTOR
DS56-DS56+
Dual-Output Thermostat and Analog Temperature Sensor
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 withrespective 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 DESCRIPTIONVREF- Bandgap Voltage Reference
OutputVT2- 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)
DESCRIPTIONThe 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. Theinternal 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.
VDD
TOUT1
TOUT2
VTEMP
VREF
VT2
VT1
GND
DS56
DETAILED PIN DESCRIPTION Table 1
DS56 FUNCTIONAL BLOCK DIAGRAM Figure 1
DS56
OVERVIEWA 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 kW.
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. Thethermostat 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
DS56
ABSOLUTE MAXIMUM RATINGS*Voltage on VDD(GND-0.3V) to +7.0VInput Current at any pin5.0 mA
Package Input Current20 mA
Operating Temperature-40°C to +125°C
Storage Temperature-55°C to 150°CESD 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 toabsolute 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 andmanufacturing 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)
DC ELECTRICAL CHARACTERISTICS:
Power Supply (Note 3)(-40°C to +125°C; 2.7V £ VDD £ 5.5V)
DC ELECTRICAL CHARACTERISTICS:
Temperature Sensor (Note 3)(-40°C to +125°C; 2.7V £ VDD £ 5.5V)4
DS56
DC ELECTRICAL CHARACTERISTICS:
Bandgap Voltage Reference VREF(-40°C to +125°C; 2.7V £ VDD £ 5.5V)
DC ELECTRICAL CHARACTERISTICS:
Trip Point Inputs VT1/VT2(-40°C to +125°C; 2.7V £ VDD £ 5.5V)
DC ELECTRICAL CHARACTERISTICS:
Thermostat Outputs TOUT1/TOUT2(-40°C to +125°C; 2.7V £ VDD £ 5.5V)
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 comparatoroffset. 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.
TYPICAL DS56 THERMOMETER ERROR Figure 3
TBD
TYPICAL DS56 VTEMP TRANSFER FUNCTION Figure 4
DS56
DS56 PHYSICAL DIMENSIONS
8-, 14-, AND 16-PIN SOIC (.150” BODY WIDTH)
