DS1821 Maxim Integrated Products, DS1821 Datasheet - Page 8
![IC THERMOMETER/STAT PROG 3-PR35](/photos/7/26/72615/406-3-pr35_sml.jpg)
DS1821
Manufacturer Part Number
DS1821
Description
IC THERMOMETER/STAT PROG 3-PR35
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1821.pdf
(18 pages)
Specifications of DS1821
Function
Thermometer, Thermostat
Topology
Comparator, Register Bank
Sensor Type
Internal
Sensing Temperature
-55°C ~ 125°C
Output Type
Digital
Output Alarm
No
Output Fan
No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-92-3 (Long Body), TO-226
Full Temp Accuracy
+/- 1 C
Digital Output - Bus Interface
Serial (1-Wire)
Digital Output - Number Of Bits
8 bit
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS1821C+
Manufacturer:
EPCOS
Quantity:
1 000
Company:
Part Number:
DS1821S
Manufacturer:
DALLAS
Quantity:
8 680
Part Number:
DS1821S
Manufacturer:
DALLAS
Quantity:
20 000
Company:
Part Number:
DS1821S+
Manufacturer:
MAXIM
Quantity:
202
Part Number:
DS1821S+TR
Manufacturer:
MAXIM/美信
Quantity:
20 000
CONFIGURATION REGISTER BIT DESCRIPTIONS Table 3
*
DONE — Temperature Conversion Done
(Read Only)
NVB — Non-volatile Memory Busy
(Read Only)
THF* — Temperature High Flag
(Read/Write)
TLF* — Temperature Low Flag
(Read/Write)
T/R ¯ * — Power-up Operating Mode
(Read/Write)
POL* — Thermostat Output (DQ) Polarity
(Read/Write)
1SHOT* — Conversion Mode
(Read/Write)
Stored in EEPROM
(User Access)
Bit Name
DONE = 0 — Temperature conversion is in progress.
DONE = 1 — Temperature conversion is complete.
NOTE: DONE = 0 at POR.
NVB = 0 — Nonvolatile memory is not busy.
NVB = 1 — A write to EEPROM memory is in progress
THF = 0 — The measured temperature has not exceeded the
value stored in the T
THF = 1 — At some point in time the measured temperature has
been higher than the value stored in the T
remain a 1 until it is over-written with a 0 by the user.
TLF = 0 — The measured temperature has not been lower than
the value stored in the T
TLF = 1 — At some point in time the measured temperature has
been lower than the value stored in the T
remain a 1 until it is over-written with a 0 by the user.
T/R ¯ = 0 — DS1821 powers up in 1- wire mode.
T/R ¯ = 1 — DS1821 powers up in thermostat mode.
POL = 0 — Thermostat output (DQ) is active low.
POL = 1 — Thermostat output (DQ) is active high.
1SHOT = 0 — Continuous conversion mode. The Start Convert
T [EEh] command initiates continuous temperature conversions,
which can be stopped with the Stop Convert T [22h] command.
1SHOT = 1 — One-shot mode. The Start Convert T [EEh]
command initiates a single temperature conversion after which
the DS1821 returns to a low-power standby state.
8 of 18
Functional Description
H
register.
L
register.
H
L
register. THF will
register. TLF will