DS1821 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
Número de pieza
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DS1821 Datasheet PDF : 18 Pages
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DS1821
ORDER INFORMATION
ORDERING
PACKAGE
DESCRIPTION
NUMBER
MARKING
DS1821
DS1821
DS1821 in 3-pin PR35
DS1821+
DS1821 (See Note)
DS1821 in 3-pin PR35
DS1821S
DS1821S
DS1821 in 208 mil 8-pin SO
DS1821S/T&R
DS1821S
DS1821 in 208 mil 8-pin SO, 2000 Piece Tape-and-Reel
DS1821S+
DS1821S (See Note) DS1821 in 208 mil 8-pin SO
DS1821S+T&R DS1821S (See Note) DS1821 in 208 mil 8-pin SO, 2000 Piece Tape-and-Reel
Note: A “+” symbol will also be marked on the package.
+ Denotes lead-free package.
DETAILED PIN DESCRIPTIONS Table 1
PR35 8-PIN SYMBOL
SO*
DESCRIPTION
1
2
GND Ground pin.
2
1
DQ Open drain data input/output pin – 1-Wire operation; Open drain
thermostat output pin –thermostat operation.
3
8
VDD Power supply pin.
*All pins not specified in this table are “No Connect” pins.
OVERVIEW
Figure 1 shows a block diagram of the DS1821 and pin descriptions are given in Table 1. The DS1821
can operate as a standalone thermostat with user-programmable trip-points or as 8-bit temperature sensor
with a 1-Wire digital interface. The open-drain DQ pin functions as the thermostat output for thermostat
operation and as the data I/O pin for 1-Wire communications. The 1-Wire interface provides user access
to the nonvolatile (EEPROM) thermostat trip-point registers (TH and TL), the status/configuration register,
and the temperature register.
When configured as standalone thermostat, temperature conversions start immediately at power-up. In
this mode, the DQ pin becomes active when the temperature of the DS1821 exceeds the limit
programmed into the TH register, and remains active until the temperature drops below the limit
programmed into the TL register.
The DS1821 uses Dallas’ exclusive 1-Wire bus protocol that implements bus communication with one
control signal. This system is explained in detail in the 1-Wire BUS SYSTEM section of this datasheet.
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