|
DS1822-PAR_07 Datasheet, PDF (1/19 Pages) Dallas Semiconductor – Econo 1-Wire Parasite-Power Digital Thermometer | |||
|
www.maxim-ic.com
FEATURES
 Unique 1-Wire® interface requires only one
port pin for communication
 Derives power from data line (âparasite
powerâ)âdoes not need a local power supply
 Multidrop capability simplifies distributed
temperature sensing applications
 Requires no external components
 ±2.0°C accuracy from -10°C to +85°C
 Measures temperatures from -55°C to +100°C
(-67°F to +212°F)
 Thermometer resolution is user-selectable
from 9 to 12 bits
 Converts temperature to 12-bit digital word in
750ms (max.)
 User-definable temperature alarm settings
 Alarm search command identifies and
addresses devices whose temperature is
outside of programmed limits (temperature
alarm condition)
 Software compatible with the DS18B20-PAR
 Ideal for use in remote sensing applications
(e.g., temperature probes) that do not have a
local power source
DS1822-PAR
Econo 1-Wire Parasite-Power
Digital Thermometer
PIN ASSIGNMENT
DALLAS
1822P
123
12 3
(BOTTOM VIEW)
TO-92
(DS1822-PAR)
PIN DESCRIPTION
GND - Ground
DQ - Data In/Out
NC - No Connect
DESCRIPTION
The DS1822-PAR digital thermometer provides 9- to 12-bit centigrade temperature measurements and
has an alarm function with nonvolatile (NV) user-programmable upper and lower trigger points. The
DS1822-PAR does not need an external power supply because it derives power directly from the data line
(âparasite powerâ). The DS1822-PAR communicates over a 1-Wire bus, which by definition requires
only one data line (and ground) for communication with a central microprocessor. It has an operating
temperature range of -55°C to +100°C and is accurate to ±2.0°C over a range of -10°C to +85°C.
Each DS1822-PAR has a unique 64-bit identification code, which allows multiple DS1822-PARs to
function on the same 1-Wire bus; thus, it is simple to use one microprocessor to control many
DS1822-PARs distributed over a large area. Applications that can benefit from this feature include
HVAC environmental controls, temperature monitoring systems inside buildings, equipment or
machinery, and process monitoring and control systems.
1-Wire is a registered trademark of Dallas Semiconductor.
1 of 19
101107
|
▷ |