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DS18B20U Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS18B20U Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 22 page DS18B20 2 of 22 ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE TOP MARK DS18B20 -55 °C to +125°C 3 TO-92 18B20 DS18B20+ -55 °C to +125°C 3 TO-92 18B20 DS18B20/T&R -55 °C to +125°C 3 TO-92 (2000 Piece) 18B20 DS18B20+T&R -55 °C to +125°C 3 TO-92 (2000 Piece) 18B20 DS18B20-SL/T&R -55 °C to +125°C 3 TO-92 (2000 Piece)* 18B20 DS18B20-SL+T&R -55 °C to +125°C 3 TO-92 (2000 Piece)* 18B20 DS18B20U -55 °C to +125°C 8 μSOP 18B20 DS18B20U+ -55 °C to +125°C 8 μSOP 18B20 DS18B20U/T&R -55 °C to +125°C 8 μSOP (3000 Piece) 18B20 DS18B20U+T&R -55 °C to +125°C 8 μSOP (3000 Piece) 18B20 DS18B20Z -55 °C to +125°C 8 SO DS18B20 DS18B20Z+ -55 °C to +125°C 8 SO DS18B20 DS18B20Z/T&R -55 °C to +125°C 8 SO (2500 Piece) DS18B20 DS18B20Z+T&R -55 °C to +125°C 8 SO (2500 Piece) DS18B20 +Denotes a lead-free package. A “+” will appear on the top mark of lead-free packages. T&R = Tape and reel. *TO-92 packages in tape and reel can be ordered with straight or formed leads. Choose “SL” for straight leads. Bulk TO-92 orders are straight leads only. PIN DESCRIPTION PIN SO μSOP TO-92 NAME FUNCTION 1, 2, 6, 7, 8 2, 3, 5, 6, 7 — N.C. No Connection 3 8 3 VDD Optional VDD. VDD must be grounded for operation in parasite power mode. 4 1 2 DQ Data Input/Output. Open-drain 1-Wire interface pin. Also provides power to the device when used in parasite power mode (see the Powering the DS18B20 section.) 5 4 1 GND Ground OVERVIEW Figure 1 shows a block diagram of the DS18B20, and pin descriptions are given in the Pin Description table. The 64-bit ROM stores the device’s unique serial code. The scratchpad memory contains the 2-byte temperature register that stores the digital output from the temperature sensor. In addition, the scratchpad provides access to the 1-byte upper and lower alarm trigger registers (TH and TL) and the 1-byte configuration register. The configuration register allows the user to set the resolution of the temperature- to-digital conversion to 9, 10, 11, or 12 bits. The TH, TL, and configuration registers are nonvolatile (EEPROM), so they will retain data when the device is powered down. The DS18B20 uses Maxim’s exclusive 1-Wire bus protocol that implements bus communication using one control signal. The control line requires a weak pullup resistor since all devices are linked to the bus via a 3-state or open-drain port (the DQ pin in the case of the DS18B20). In this bus system, the microprocessor (the master device) identifies and addresses devices on the bus using each device’s unique 64-bit code. Because each device has a unique code, the number of devices that can be addressed on one |
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