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DS1721S-T,R Datasheet(PDF) 2 Page - Maxim Integrated Products |
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DS1721S-T,R Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 17 page DS1721 2 of 17 ORDERING INFORMATION ORDERING INFORMATION PACKAGE MARKING DESCRIPTION DS1721S DS1721 DS1721 in 150 mil 8-pin SO DS1721S+ DS1721 (See Note) DS1721 in Lead-Free 150 mil 8-pin SO DS1721S/T&R DS1721 DS1721 in 150 mil 8-pin SO, 2500 Piece Tape-and-Reel DS1721S+T&R DS1721 (See Note) DS1721 in Lead-Free 150 mil 8-pin SO, 2500 Piece Tape- and-Reel DS1721U 1721 DS1721 in 8-pin uSOP DS1721U+ 1721 (See Note) DS1721 in Lead-Free 8-pin uSOP DS1721U/T&R 1721 DS1721 in 8-pin uSOP, 3000 Piece Tape-and-Reel DS1721U+T&R 1721 (See Note) DS1721 in Lead-Free 8-pin uSOP, 3000 Piece Tape-and-Reel Note: A ”+” symbol will also be marked on the package near the Pin 1 indicator. DETAILED PIN DESCRIPTION Table 1 PIN SYMBOL DESCRIPTION 1 SDA Data input/output pin. For 2-wire serial communication port. 2 SCL Clock input/output pin. For 2-wire serial communication port. 3 TOUT Thermostat output. Active when temperature exceeds TH; will reset when temperature falls below TL. 4 GND Ground pin. 5 A2 Address input pin. 6 A1 Address input pin. 7 A0 Address input pin. 8 VDD Supply Voltage. 2.7V to 5.5V input power pin. OVERVIEW A block diagram of the DS1721 is shown in Figure 1. The DS1721 consists of five major components: 1. Precision temperature sensor 2. Analog-to-digital converter 3. 2-wire interface electronics 4. Data registers 5. Thermostat comparator The factory-calibrated temperature sensor requires no external components. Upon power-up, the DS1721 is in an idle mode. Upon issuance of a Start Convert T command [51h], the DS1721 begins temperature conversions with the default resolution of 12 bits (0.0625°C resolution). Following an 8-bit command protocol, temperature data can be read over the 2-wire interface. The host can periodically read the value in the temperature register, which contains the last completed conversion. As conversions are performed in the background, reading the temperature register does not affect the conversion in progress. In power-sensitive applications, the user can put the DS1721 in a “one-shot” mode, under which the sensor will complete and store one temperature conversion and return to a low-power standby state. In time-sensitive applications, the user can change the conversion resolution from 12 bits to 9, 10, or 11. |
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