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DS1821 データシート(PDF) 2 Page - Dallas Semiconductor |
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DS1821 データシート(HTML) 2 Page - Dallas Semiconductor |
2 / 18 page DS1821 2 of 18 ORDER INFORMATION ORDERING NUMBER PACKAGE MARKING DESCRIPTION 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 SO* SYMBOL 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. |
同様の部品番号 - DS1821_07 |
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同様の説明 - DS1821_07 |
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