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PDF DS56 Data sheet ( Hoja de datos )
| Número de pieza | DS56 | |
| Descripción | Dual Temperature Comparator | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS56 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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PRELIMINARY
DS56
Dual Temperature Comparator
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
VREF
VT2
VT1
GND
1
2
3
4
8 VDD
7 TOUT1
6 TOUT2
5 VTEMP
DS56S 8-Pin SOIC (150-mil)
PIN DESCRIPTION
VREF
- Bandgap Voltage Reference
Output
VT2
VT1
GND
- Temperature Trip Point 2
- Temperature Trip Point 1
- Ground
VTEMP
TOUT2
- Temp Sensor Output Voltage
- 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.
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DC ELECTRICAL CHARACTERISTICS:
Bandgap Voltage Reference VREF
PARAMETER SYMBOL CONDITION
VREF Output
Power Supply
Regulation
VREF
? VREF/
? VDD
2.7V≤VDD≤3.3V
30V≤VDD≤5.5V
Load Regulation
? VREF/
? IL
+3.0µA≤IL≤
+50µA
DS56
(-40°C to +125°C; 2.7V ≤VDD ≤5.5V)
MIN TYP MAX UNITS NOTES
1.238 1.25 1.263
V
±1.45 mV
±0.2 mV/V
0.15 mV/µA
DC ELECTRICAL CHARACTERISTICS:
Trip Point Inputs VT1/VT2
PARAMETER SYMBOL CONDITION
Input Bias Current
IBIAS
Input Range
VTIN
(-40°C to +125°C; 2.7V ≤VDD ≤5.5V)
MIN TYP MAX UNITS NOTES
300 nA
0
(VDD
-1.0)
V
DC ELECTRICAL CHARACTERISTICS:
Thermostat Outputs TOUT1/TOUT2
PARAMETER SYMBOL CONDITION
Logic 1 Output
Leakage Current
IOUT1
VDD = 5.0V
LOGICAL 0
Output Voltage
VOUT0
IOUT = +50 µA
(-40°C to +125°C; 2.7V ≤VDD ≤5.5V)
MIN TYP MAX UNITS NOTES
1.0 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 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
TBD
5 of 6
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5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DS56.PDF ] | |
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