PDF DS2482-800 Data sheet ( Hoja de datos )

Número de pieza	DS2482-800
Descripción	Eight-Channel 1-Wire Master
Fabricantes	Dallas Semiconducotr
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No Preview Available ! www.maxim-ic.com GENERAL DESCRIPTION The DS2482-800 is an I²C™ to 1-Wireâ bridge device that interfaces directly to standard (100kHz max) or fast (400kHz max) I²C masters to perform bi- directional protocol conversion between the I²C master and any downstream 1-Wire slave devices. Relative to any attached 1-Wire slave device, the DS2482-800 is a 1-Wire master. Internal factory- trimmed timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and Overdrive 1-Wire communication speeds. To optimize 1-Wire waveform generation, the DS2482-800 performs slew-rate control on rising and falling 1-Wire edges and has a programmable feature to mask the fast presence pulse edge that some 1-Wire slave devices can generate. Programmable strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs and sensors. The DS2482-800 combines these features with eight independent 1- Wire I/O channels. The I²C slave address assignment is controlled by three binary address inputs, resolving potential conflicts with other I²C slave devices in the system. APPLICATIONS § Wireless Base Stations § Central Office Switches § PBXs § Rack-Based Servers § Medical Clinical Diagnostic Equipment TYPICAL OPERATING CIRCUIT (I²C port) µC VCC RP SDA SCL AD0 AD1 AD2 Rt IO0 IO1 IO2 IO3 IO4 IO5 IO6 IO7 DS2482 800 1-Wire lines 1-Wire Device #1 1-Wire Device #2 DS2482-800 Eight-Channel 1-Wire Master FEATURES § I²C Host Interface, Supports 100kHz and 400kHz I²C Communication Speeds § 1-Wire Master I/O with Selectable Active or Passive 1-Wire Pullup § Provides Reset/Presence, 8-Bit, Single-Bit, and Three-Bit 1-Wire I/O Sequences § Eight Channels of Independently Operated 1-Wire I/O § Standard and Overdrive 1-Wire Communication Speeds § Slew Controlled 1-Wire Edges § Selectable 1-Wire Slave Presence Pulse Falling Edge Masking to Control Fast Edges on the 1-Wire Line § Supports Low-Impedance 1-Wire Strong Pullup for EEPROMs, Temp Sensors, or Other 1-Wire Slaves That Have Momentary High Current Modes § Three Address Inputs for I²C Address Assignment § Wide Operating Range: 2.9V to 5.5V, -40°C to +85°C § 16-Pin SO Package (150 mil) ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE DS2482S-800 -40 to +85°C 16 SO (150 mil ) DS2482S-800/T&R -40 to +85°C 16 SO (150 mil ) PIN CONFIGURATION IO3 1 16 IO2 SCL 2 15 IO1 SDA 3 14 IO0 VDD 4 13 GND NC 5 12 IO4 AD2 6 11 IO5 AD1 7 10 IO6 AD0 8 9 IO7 I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. 1-Wire is a registered trademark of Dallas Semiconductor. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 22 REV: 061804 1 page Figure 1. Block Diagram DS2482-800: Eight-Channel 1-Wire Master SDA SCL AD0 AD1 AD2 T-Time OSC Config Register I²C Interface Controller I/O Controller Status Register Read Data Register Channel Select Line XCVR Line XCVR Line XCVR Line XCVR Line XCVR Line XCVR Line XCVR Line XCVR IO0 IO1 IO2 IO3 IO4 IO5 IO6 IO7 DETAILED DESCRIPTION The DS2482-800 is a self-timed 8-channel 1-Wire master, which supports advanced 1-Wire waveform features including standard and Overdrive speeds, active pullup, strong pullup for power delivery, and presence pulse masking. Once supplied with command and data, the I/O controller of the DS2482 performs time-critical 1-Wire communication functions such as reset/presence detect cycle, read-byte, write-byte, single-bit R/W and triplet for ROM Search, without requiring interaction with the host processor. The host obtains feedback (completion of a 1- Wire function, presence pulse, 1-Wire short, search direction taken) through the Status Register and data through the Read Data register. The DS2482 communicates with a host processor through its I²C bus interface in standard- mode or in fast-mode. The logic state of three address pins (2 address pins with the 1-channel version) determines the I²C slave address of the DS2482, allowing up to 8 devices operating on the same bus segment without requiring a hub. DEVICE REGISTERS The DS2482 has four registers that the I²C host can read: Channel Selection, Configuration, Status, and Read Data. These registers are addressed by a read pointer. The position of the read pointer, i.e., the register that the host will read in a subsequent read access, is defined by the instruction that the has DS2482 executed last. The host has read and write access to the Channel Selection and Configuration Registers to select one of several 1- Wire channels and to enable certain 1-Wire features. 5 of 22 5 Page DS2482-800: Eight-Channel 1-Wire Master Channel Select Command Code Command Parameter Description Typical Use Restriction Error Response Command Duration 1-Wire Activity Read Pointer Position Status Bits Affected Configuration Bits Affected C3h Selection Code Sets the 1-Wire IO channel for subsequent 1-Wire communication commands. NOTE: The selection code read back is different from the code written. See the table below for the respective values. Selecting a 1-Wire IO channel other that IO0; randomly selecting one of the available 1-Wire IO channels. 1-Wire activity must have ended before the DS2482 can process this command. Command code and parameter will not be acknowledged if 1WB = 1 at the time the command code is received and the command will be ignored. If the selection code is not valid, the selection code will not be acknowledged and the command will be ignored. None; the channel selection register is updated on the rising SCL edge of the selection code acknowledge bit. None Channel Selection Register (to verify write) None None Valid Channel Selection Codes Channel Selection Channel IO0 (default) Channel IO1 Channel IO2 Channel IO3 Channel IO4 Channel IO5 Channel IO6 Channel IO7 Code (to be written) F0h E1h D2h C3h B4h A5h 96h 87h Code (read back) B8h B1h AAh A3h 9Ch 95h 8Eh 87h Figure 5. 1-Wire Reset/Presence Detect Cycle VCC VIH1 VIL1 0V tF1 RESET PULSE tRSTL PRESENCE/SHORT DETECT tSI tMSP tRSTH Pullup DS2482 Pulldown 1-W Slave Pulldown For presence-pulse masking and pullup details see Figure 3. 11 of 22 11 Page

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