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PDF DS1775 Data sheet ( Hoja de datos )

Número de pieza DS1775
Descripción Digital Thermometer and Thermostat
Fabricantes Maxim Integrated 
Logotipo Maxim Integrated Logotipo



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GENERAL DESCRIPTION
The DS1775 digital thermometer and thermostat
provides temperature readings that indicate the
device’s temperature. Thermostat settings and
temperature readings are all communicated
to/from the DS1775 over a simple 2-wire serial
interface. No additional components are
required; the device is truly a “temperature-to-
digital” converter.
For applications that require greater temperature
resolution, the user can adjust the readout
resolution from 9 to 12 bits. This is particularly
useful in applications where thermal runaway
conditions must be detected quickly.
The open-drain thermal alarm output, O.S.,
becomes active when the temperature of the
device exceeds a user-defined temperature TOS.
The number of consecutive faults required to set
O.S. active is configurable by the user. The
device can also be configured in the interrupt or
comparator mode, to customize the method
which clears the fault condition.
As a digital thermometer, the DS1775 is
software compatible with the DS75 2-wire
thermal watchdog. The DS1775 is assembled in
a compact 5-pin SOT23 package, allowing for
low-cost thermal monitoring/control in space-
constrained applications. The low thermal mass
allows for time constants previously only
possible with thermistors.
APPLICATIONS
Personal Computers/Servers/Workstations
Cell Phones
Office Equipment
Any Thermally-Sensitive System
DS1775
Digital Thermometer
and Thermostat in SOT23
FEATURES
Temperature Measurements Require No
External Components
Measures Temperatures from -55°C to
+125°C (-67°F to +257°F)
• ±2.0°C Thermometer Accuracy
Thermometer Resolution is Configurable
from 9 Bits to 12 Bits (0.5°C to 0.0625°C
Resolution)
User-Definable Thermostat Settings
Data is Read From/Written to Through a
2-Wire Serial Interface
2.7V to 5.5V Wide Power-Supply Range
Software Compatible with DS75 2-Wire
Thermal Watchdog in Thermometer Mode
Space-Conscious 5-Pin SOT23 Package with
Low Thermal Time Constant
PIN CONFIGURATION
SCL 1 5 SDA
GND 2
O.S. 3 4
SOT23
VDD
PIN DESCRIPTION
GND
Ground
SCL 2-Wire Serial Clock
SDA
2-Wire Serial Data Input/Output
VDD Power-Supply Voltage
O.S. Thermostat Output Signal
Ordering Information appears at end of data sheet.
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19-6687; Rev 5/13

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DS1775 pdf
Figure 2. O.S. Output Transfer Function
DS1775
Regardless of the mode chosen, the O.S. output is open-drain and the active state is set in the
configuration register. The power-up default is active low. See the Programming section for instructions
in adjusting the thermostat setpoints, thermostat mode, and O.S. active state.
Programming
There are three areas of interest in programming the DS1775: the configuration register, the TOS register,
and the THYST register. All programming is done via the 2-wire interface by setting the pointer to the
appropriate location. Table 3 illustrates the pointer settings for the four registers of the DS1775.
Table 3. Pointer Register Structure
POINTER ACTIVE REGISTER
00h Temperature (default)
01h Configuration
02h THYST
03h TOS
The DS1775 powers up with the temperature register selected. If the host wishes to change the data
pointer, it simply addresses the DS1775 in the write mode (R/ W = 0), receives an acknowledge, and
writes the 8 bits that correspond to the new desired location. The last pointer location is always
maintained so that consecutive reads from the same register do not require the host to always provide a
pointer address. The only exception is at power-up, in which case the pointer is always set to 00h, the
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DS1775 arduino
DS1775
ABSOLUTE MAXIMUM RATINGS
(Voltages relative to ground.)
Voltage Range on VDD
Voltage Range on Any Other Pin
Operating Temperature Range
Storage Temperature Range
Lead Temperature (soldering, 10s)
Soldering Temperature (reflow)
-0.3V to +7.0V
-0.3V to +7.0V
-55°C to +125°C
-55°C to +125°C
+300°C
+260°C
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.
DC ELECTRICAL CHARACTERISTICS
(2.7V ≤ VDD ≤ 5.5V, TA = -55°C to +125°C, unless otherwise noted.)
PARAMETER
SYMBOL CONDITION MIN TYP
Supply Voltage
Input Logic-High
Input Logic-Low
SDA Output Logic-Low
VDD
VIH
VIL
VOL1
3mA sink
current
2.7
0.7VDD
-0.5
0
Voltage
VOL2
6mA sink
current
0
O.S. Saturation Voltage
VOL
4mA sink
current
Input Current Each I/O
Pin
I/O Capacitance
0.4 < VI/O <
0.9VDD
CI/O
-10
Standby Current
IDD1
Active temp
Active Current
IDD
conversions
Communication
only
DIGITAL THERMOMETER
Thermometer Error
TERR
-10°C to +85°C
-55°C to +125°C
Resolution
9
9-bit
conversion
125
Conversion Time
tCONVT
10-bit
conversion
11-bit
conversion
250
500
12-bit
conversion
1000
MAX
5.5
VDD+0.5
0.3VDD
0.4
0.6
0.8
+10
10
1
1000
100
±2.0
±3.0
12
187.5
375
750
1500
UNITS
V
V
V
V
V
µA
pF
µA
µA
°C
Bits
ms
NOTES
1
1
1
1
1, 9
2
3, 4
3, 4
9, 10
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