Text version of the page

DS2482-100Single-Channel 1-Wire Maste r

www.maxim-ic.com

GENERAL DESCRIPTION FEATURES

The DS2482-100 is an I²C to 1-Wire 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 DS2482-100 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 DS2482-100 performs slew rate control on rising and falling 1-Wire edges and provides additional programmable features to match drive characteristics to the 1-Wire slave environment. Programmable strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs and sensors. The DS2482-100 combines these features with an output to control an external MOSFET for enhanced strong pullup application. The I²C slave address assignment is controlled by two binary address inputs, resolving potential conflicts with other I²C slave devices in the system. I²C Host Interface, Supports 100kHz and 400kHz I²C Communication Speeds 1-Wire Master IO with Selectable Active or Passive 1-Wire Pullup Provides Reset/Presence, 8-Bit, Single-Bit, and Three-Bit 1-Wire IO Sequences 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 2 Address Inputs for I²C Address Assignment Operating Range: 2.9V to 5.5V, -40°C to +85°C 8-Pin, 150-mil SO Package, UCSP™ Package

ORDERING INFORMATION

PART TEMP RANGE PIN-PACKAGE PKGCODE DS2482S-100+ -40°C to +85 C 8 SO (150 mils) —

APPLICATIONS

Printers

DS2482S-100+T&R -40°C to +85 C 8 SO (150 mils) —

Medical Instruments Industrial Sensors

DS2482X-100+T -40°C to +85 C 8 UCSP, 2.5k pcs W92A1+1

Cell Phones, PDAs

+ Denotes a lead-free package. T and T&R = Tape and reel.

TYPICAL OPERATING CIRCUIT

V CC

PIN CONFIGURATIONS

*R A D0
P Current Limiting Resistor 1 2 3 4 8765
SDA SCL A D1 PCTLZ SDA VCCIOGNDSCL
(I²C port)

µC

Optional circuitry DS2482-100 AD0 AD1 *R t 1-Wire line IOPCTLZ A 1 Mark A 1 = PCTLZ A 2 = AD1
1-Wire Device 1-Wire Device 1-Wire Device A

24821 yywwrr###xx

A 3 = AD0 B1 = SCL B2 = SDA B3 = VCC C2 = GND C3 = IO BC

1-Wire is a registered trademark of Dallas Semiconductor, a wholly owned subsidiary of Maxim Integrated Products, Inc. UCSP is a trademark of Maxim Integrated Products, Inc.

123 UCSP, Top View with Laser Mark, Contacts Not Visible. See 21-0067 for UCSP package outline drawing. yywwrr = Date/Revision###xx = Lot Number

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:

1 of 21

www.maxim-ic.com/errata .

REV: 090407