MAXIM DS56 User Manual
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DS56
www.maxim-ic.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.
Dual Temperature Comparato
PIN ASSIGNMENT
V
GND
DS56S 8-Pin SOIC (150-mil)
V
V
REF
1
2
T2
3
T1
4
PIN DESCRIPTION
V
- Bandgap Voltage Reference
REF
Output
VT2 - Temperature Trip Point 2
VT1 - Temperature Trip Point 1
GND - Ground
V
- Temp Sensor Output Voltage
TEMP
T
- Thermostat output for Trip
OUT2
Point 2
T
- Thermostat output for Trip
OUT1
V
8
7
6
5
T
T
V
DD
OUT1
OUT2
TEMP
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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DS56
ORDER INFORMATION
ORDERING
NUMBER
DS56S DS56 DS56 in 150 mil 8-pin SO
DS56S/T&R DS56 DS56 in 150 mil 8-pin SO, 2500 Piece Tape-and-Reel
DS56S+ DS56 (See Note) DS56 in Lead-Free 150 mil 8-pin SO
DS56S+T&R DS56 (See Note) DS56 in Lead-Free 150 mil 8-pin SO, 2500 Piece Tape-
DS56U DS56 DS56 in 8-pin uSOP
DS56U/T&R DS56 DS56 in 8-pin uSOP, 3000 Piece Tape-and-Reel
DS56U+ DS56 (See Note) DS56 in Lead-Free 8-pin uSOP
DS56U+T&R DS56 (See Note) DS56 in Lead-Free 8-pin uSOP, 3000 Piece Tape-and-
Note: A “+” symbol will also be marked on the package near the Pin 1 indicator.
PACKAGE
MARKING
DESCRIPTION
and-Reel
Reel
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DETAILED PIN DESCRIPTION Table 1
PIN SYMBOL TYPE DESCRIPTION
1 V
Analog output Bandgap output 1.25V (nom) voltage reference output.
REF
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
5 V
6 T
7 T
8 VDD V
Analog output Temperature sensor output. (+6.2 T
TEMP
Digital output
OUT2
OUT1
(open-drain)
Digital output
(open-drain)
Supply Voltage 2.7V - 5.5V input power pin.
DD
Ground pin.
+ 395) mV.
DegC
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.
DS56 FUNCTIONAL BLOCK DIAGRAM Figure 1
DS56
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