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DS1821S+R Datasheet(PDF) 2 Page - Maxim Integrated Products |
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DS1821S+R Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 19 page DS1821 2 of 19 ORDERING INFORMATION PART PACKAGE MARKING PIN-PACKAGE DS1821C+ DS1821 3 TO92 DS1821S+ DS1821S 8 SO (208 mils) DS1821S+T&R DS1821S 8 SO (208 mils), 2000 Piece Tape-and-Reel +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. DETAILED PIN DESCRIPTIONS Table 1 TO92 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 Maxim’s 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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