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DS1821 Datasheet

  • DS1821

  • Programmable Digital Thermostat

  • Dallas   Dallas

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DS1821
Programmable Digital Thermostat
www.dalsemi.com
FEATURES
Requires no external components
Measures temperatures from -55擄C to +125擄C
in 1擄C increments. Fahrenheit equivalent is -
67擄F to +257擄F in 1.8擄F increments
DS1821
Converts temperature to digital word in 1
second (max.)
Thermostatic settings are user definable and
nonvolatile
Available in 3-pin PR35, TO-220, and 8-pin
SOIC packages
Applications include thermostatic controls,
industrial systems, consumer products,
thermometers, or any thermally sensitive
system
PIN ASSIGNMENT
DS1821
PR35 PACKAGE
See Mech. Drawing
Section
DQ
GND
NC
DNC
1
2
3
4
8
7
6
5
DS1821T
TO-220 PACKAGE
See Mech. Drawing
Section
V
DD
NC
NC
DNC
DS1821S 8-Pin SOIC (208-mil)
See Mech Drawings Section
PIN DESCRIPTION
GND
DQ
V
DD
NC
DNC
- Ground
- Data In/Out
- Power Supply Voltage +5V
- No Connect
- Do Not Connect
DESCRIPTION
The DS1821 Programmable Digital Thermostat provides a thermal alarm logic output when the
temperature of the device exceeds a user-defined temperature TH. The output remains active until the
temperature drops below user defined temperature TL, allowing for any hysteresis necessary.
User-defined temperature settings are stored in nonvolatile memory, so parts can be programmed prior to
insertion in a system. Communication to/from the DS1821 is accomplished through the DQ pin in a
programming mode; this same pin is used in operation as the thermostat output.
1 of 16
112099

DS1821 產(chǎn)品屬性

  • 1-Wire CommunicationsLead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 500

  • 集成電路 (IC)

  • PMIC - 熱管理

  • 1-Wire®

  • 溫度計(jì)，恒溫計(jì)

  • 內(nèi)部

  • -55°C ~ 125°C

  • ±1°C（最小值）

  • 數(shù)字

  • 無(wú)

  • 無(wú)

  • 2.7 V ~ 5.5 V

  • -55°C ~ 125°C

  • 通孔

  • TO-226-3、TO-92-3 長(zhǎng)體

  • TO-92-3

  • 托盤(pán)

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