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PDF STDS75 Data sheet ( Hoja de datos )
| Número de pieza | STDS75 | |
| Descripción | Digital temperature sensor and thermal watchdog | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STDS75
Digital temperature sensor and thermal watchdog
Features
■ Measures temperatures from –55°C to +125°C
(–67°F to +257°F)
– ±2°C Accuracy from –25°C to +100°C
(max)
■ Low operating current: 125µA (typ)
■ No external components required
■ 2-wire I2C/SMBus-compatible serial interface
– Selectable serial bus address allows
connection of up to eight devices on the
same bus
■ Thermometer resolution is user-configurable
from 9 (Default) to 12 bits (0.5°C to 0.0625°C)
■ 9-bit conversion time is 150ms (max)
■ Programmable temperature threshold and
hysteresis set points
■ Wide power supply range-operating voltage
range: 2.7V to 5.5V
■ Pin- and software-compatible with DS75 (drop-
in replacement)
■ Power up defaults permit stand-alone
operation as thermostat
■ Shutdown mode to minimize power
consumption
■ Separate open drain output pin operates as an
interrupt or comparator/thermostat output (dual
purpose event pin)
■ Packages:
– SO8
– MSOP8 (TSSOP8)(a)
SO8 (M)
MSOP8
(TSSOP8) (DS)
a. Contact local ST sales office for availability
June 2007
Rev 5
1/37
www.st.com
1
1 page  
STDS75
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connections (SO8 and TSSOP8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical 2-wire interface connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OS output temperature response diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Typical 2-byte READ from preset pointer location (e.g. temp - TOS, THYS) . . . . . . . . . . . . 24
Typical pointer set followed by an immediate READ for 2-byte register (e.g. temp). . . . . . 24
Typical 1-byte READ from the configuration register with preset pointer . . . . . . . . . . . . . . 24
Typical pointer set followed by an Immediate READ from the configuration register . . . . . 25
Configuration register WRITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
TOS and THYS WRITE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Temperature variation vs. voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SO8 – 8-lead plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
MSOP8 (TSSOP8) – 8-lead, thin shrink small package (3mm x 3mm) outline. . . . . . . . . . 34
5/37
5 Page 
STDS75
Operation
2.1
Applications information
STDS75 digital Temperature Sensors are optimal for thermal management and thermal
protection applications. They require no external components for operations except for pull-
up resistors on SCL, SDA, and OS/INT outputs. A 0.1µF bypass capacitor is recommended.
The sensing device of STDS75 is the chip itself. The typical interface connection for this
type of digital sensor is shown in Figure 4 on page 11.
Intended Applications include:
● System Thermal Management
● Computers/Disk Drivers
● Electronics/Test Equipment
● Power Supply Modules
● Consumer Products
● Battery Management
● FAX/Printers Management
● Automotive
Figure 4.
Typical 2-wire interface connection diagram
Pull-up
VDD
VDD
Pull-up
VDD
10kΩ
VDD
STDS75
0.1μF
10kΩ
10kΩ
O.S./INT(1) SCL
A0 SDA(1)
A1
A2 GND
Master
Device
I2C Address = 1001000 (1001A2A1A0)
1. SDA and OS/INT are open drain.
AI11832
11/37
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STDS75.PDF ] | |
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