Datasheet

DS1822
3 of 21
DS1822 BLOCK DIAGRAM Figure 1
V
PU
4.7K
POWER
SUPPLY
SENSE
64-BIT ROM
AND
1-wire PORT
D
Q
V
DD
INTERNAL V
DD
C
PP
PARASITE POWER
CIRCUIT
MEMORY CONTROL
LOGIC
SCRATCHPAD
8-BIT CRC GENERATOR
TEMPERATURE SENSOR
ALARM HIGH TRIGGER (T
H
)
REGISTER (EEPROM)
ALARM LOW TRIGGER (T
L
)
REGISTER (EEPROM)
CONFIGURATION REGISTER
(EEPROM)
GND
DS1822