|
|
PDF DS1775 Data sheet ( Hoja de datos )
| Número de pieza | DS1775 | |
| Descripción | SOT23-5 Digital Thermometer and Thermostat | |
| Fabricantes | Dallas | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de DS1775 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
www.dalsemi.com
PRODUCT PREVIEW
PRELIMINARY
DS1775
SOT23-5 Digital Thermometer
and Thermostat
FEATURES
§ Temperature measurements require no
external components
§ Measures temperatures from –55°C to
+125°C. Fahrenheit equivalent is –67°F to
257°F
§ Thermometer accuracy is ±2.0°C
§ Thermometer resolution is configurable from
9 to 12 bits (0.5°C to 0.0625°C resolution)
§ Thermostat settings are user definable
§ Data is read from/written to via a 2–wire
serial interface
§ Wide power supply range (2.7V – 5.5V)
§ Software compatible with DS75 2–Wire
Thermal Watchdog in thermometer mode
§ Space–conscious SOT23–5 package with
low thermal time constant
PIN ASSIGNMENT
SCL 1 5 SDA
GND 2
O.S. 3 4 VDD
DS1775R
SOT23-5
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
Part Number Address
Part Number Address
DS1775R/TRL 000
DS1775R/TR4 100
DS1775R/TR1 001
DS1775R/TR5 101
DS1775R/TR2 010
DS1775R/TR6 110
DS1775R/TR3 011
DS1775R/TR7 111
* "R" denotes SOT 23-5 Package
DESCRIPTION
The DS1775 SOT23-5 Digital Thermometer and Thermostat provides temperature readings which
indicate the temperature of the device. 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.
1 of 13
102299
1 page  
O.S. OUTPUT TRANSFER FUNCTION Figure 2
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. Refer to the “OPERATION–Programming”
section for instructions in adjusting the thermostat setpoints, thermostat mode, and O.S. active state.
OPERATION–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.
Pointer Register Structure Table 3
POINTER
ACTIVE REGISTER
00h Temperature (default)
01h Configuration
02h THYST
03h TOS
The DS1775 will power 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.
5 of 13
102299
5 Page 
DS1775
ABSOLUTE MAXIMUM RATINGS*
Voltage on VDD, Relative to Ground
–0.3V to +7.0V
Voltage on any other pin, Relative to Ground
–0.3V to +7.0V
Operating Temperature
–55°C to +125°C
Storage Temperature
–55°C to +125°C
Soldering Temperature
260°C for 10 seconds
* 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.
RECOMMENDED DC OPERATING CONDITIONS
(–55°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 (–55°C to +125°C; 2.7V ≤VDD ≤5.5V)
PARAMETER
SYMBOL CONDITION MIN TYP MAX UNITS NOTES
Input Logic High
VIH
0.7 VDD
VDD+0.5 V
1
Input Logic Low
SDA Output Logic Low
Voltage
VIL
VOL1
3 mA sink
current
-0.5
0
0.3VDD
0.4
V
V
1
1
VOL2
6 mA sink
current
0
0.6
O.S. Saturation Voltage
VOL
4 mA sink
current
0.8 V 1,9
Input current each I/O pin
0.4 < VI/O <
0.9VDD
-10
+10 µA
2
I/O Capacitance
Standby Current
CI/O
IDD1
10 pF
1 µA 3,4
Active Current
IDD Active Temp.
Conversions
1000
µA
3,4
Communication
100
only
ELECTRICAL CHARACTERISTICS:
DIGITAL THERMOMETER
(–55°C to +125°C; 2.7V ≤VDD ≤5.5V)
PARAMETER
SYMBOL CONDITION MIN TYP MAX UNITS NOTES
Thermometer Error
TERR –10°C to +85°C
±2.0 °C 9, 10
–55°C to 125°C
±3.0
Resolution
9 12 bits
Conversion Time
tCONVT
9-bit
125 150
ms
conversion
10-bit
250 300
conversion
11-bit
500 600
conversion
12-bit
1000 1200
conversion
11 of 13
102299
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet DS1775.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS1775 | Digital Thermometer and Thermostat |  Maxim Integrated |
| DS1775 | SOT23-5 Digital Thermometer and Thermostat | Dallas |
| DS1776 | PI-Bus Transceiver |  National |
| DS1776QML | DS1776QML Pi-Bus Transceiver (Rev. B) |  Texas Instruments |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |