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DS18B20 Arkusz danych(PDF) 3 Page - Dallas Semiconductor

Numer części DS18B20
Szczegółowy opis  Programmable Resolution 1-Wire Digital Thermometer
Download  21 Pages
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Producent  DALLAS [Dallas Semiconductor]
Strona internetowa  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS18B20 Arkusz danych(HTML) 3 Page - Dallas Semiconductor

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Another feature of the DS18B20 is the ability to operate without an external power supply. Power is
instead supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high. The high bus
signal also charges an internal capacitor (CPP), which then supplies power to the device when the bus is
low. This method of deriving power from the 1-Wire bus is referred to as “parasite power.” As an
alternative, the DS18B20 may also be powered by an external supply on VDD.
DS18B20 BLOCK DIAGRAM Figure 1
VPU
4.7k
POWER
SUPPLY
SENSE
64-BIT ROM
AND
1-wire PORT
DQ
VDD
INTERNAL VDD
CPP
PARASITE POWER
CIRCUIT
MEMORY CONTROL
LOGIC
SCRATCHPAD
8-BIT CRC GENERATOR
TEMPERATURE SENSOR
ALARM HIGH TRIGGER (TH)
REGISTER (EEPROM)
ALARM LOW TRIGGER (TL)
REGISTER (EEPROM)
CONFIGURATION REGISTER
(EEPROM)
GND
DS18B20


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