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DS28E17 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS28E17 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 27 page Detailed Description The DS28E17 combines a 1-Wire front end, an I2C bus controller, and functionality to bridge these two interfaces for data communication in a single chip. Data is trans- ferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return for signaling. The DS28E17 has a transparent buffer to write and read to the I2C bus controller. I2C data is written and read back by sending 1-Wire packets. As well, a ROM ID acces- sible from 1-Wire command protocol guarantees unique identification and is also used to address the device in a multidrop 1-Wire network environment, where multiple devices reside on a common 1-Wire bus and operate independently of each other. Overview Figure 1 shows the hierarchical structure of the 1-Wire protocol. The bus master must first provide one of the seven ROM function commands: Read ROM, Match ROM, Search ROM, Skip ROM, Resume, Overdrive-Skip ROM, or Overdrive-Match ROM. Upon completion of an Overdrive-Skip ROM or Overdrive-Match ROM command byte executed at standard speed, the device enters over- drive mode where all subsequent communication occurs at a higher speed. All data is read and written least significant bit first. Figure 1. Hierarchical Structure for 1-Wire Protocol DS28E17 1-Wire-to-I2C Master Bridge www.maximintegrated.com Maxim Integrated │ 7 Pin Description (continued) PIN NAME TYPE FUNCTION 15 SCL Output I2C Serial-Clock. Must be connected to the I2C bus supply voltage through a pullup resistor. 16 SDA IO I2C Serial-DataInput/Output. Must be connected to the I2C bus supply voltage through a pullup resistor. — EP — Exposed Pad. Solder or thermally connect the Exposed Pad to GND or an electrically unconnected pad to achieve specified thermal characteristics. 1-Wire ROM FUNCTION COMMANDS DS28E17-SPECIFIC DEVICE COMMANDS READ ROM [33h] MATCH ROM [55h] SEARCH ROM [F0h] SKIP ROM [CCh] RESUME [A5h] OVERDRIVE SKIP [3Ch] OVERDRIVE MATCH [69h] WRITE DATA WITH STOP [4Bh] WRITE DATA NO STOP [5Ah] WRITE DATA ONLY [69h] WRITE DATA ONLY WITH STOP [78h] READ DATA WITH STOP [87h] WRITE, READ DATA WITH STOP [2Dh] WRITE CONFIGURATION [D2h] READ CONFIGURATION [E1h] ENABLE SLEEP MODE [1Eh] READ DEVICE REVISION [C3h] AVAILABLE COMMANDS DS28E17 COMMAND LEVEL: DATA FIELD AFFECTED: 64-BIT REG. #, RC-FLAG 64-BIT REG. #, RC-FLAG 64-BIT REG. #, RC-FLAG RC-FLAG RC-FLAG RC-FLAG, OD-FLAG 64-BIT REG. #, RC-FLAG, OD-FLAG S, AD_0, xxh, P S, AD_0, xxh xxh, xxh, P S, AD_1, [xxh], P S, AD_0, xxh, P, S, AD_1, [xxh], P WRITE SPD BITS READ SPD BITS SLEEP ON, WAKEUP LOOKS FOR EDGE READ MAJOR AND MINOR REVISION |
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