DS2482S-100TR 查看數據表（PDF） - Maxim Integrated

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DS2482S-100TR

Single-Channel 1-Wire Master

Maxim Integrated 

DS2482-100

Single-Channel 1-Wire Master

General Description

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 bidirectional pro-

tocol 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 over-

drive 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.

Applications

Printers

Medical Instruments

Industrial Sensors

Cell Phones, PDAs

Benefits and Features

• Allows Easy Interface Between a I2C Microport and a

1-Wire Slave

• 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

3-Bit 1-Wire IO Sequences

• Standard and Overdrive 1-Wire Communication

Speeds

• Two Address Inputs for I2C Address Assignment

• Minimizes Line Noise Reducing System EMI

• Slew-Controlled 1-Wire Edges

• Supports EEPROMs, Temperature Sensors, or Other

1-Wire Slaves That Have Momentary High Source

Current Modes

• Strong 1-Wire Pullup Provided by an Internal Low-

Impedance Signal Path

• PCTLZ Output to Optionally Control an External

MOSFET for Stronger Pullup Requirements

• Operating Range: 2.9V to 5.5V, -40°C to +85°C

• 8-Pin (150 mils) SO and 9-Bump WLP Packages

Pin Configurations and Ordering Information appear at end

of data sheet.

Typical Operating Circuit

VCC

(I2C PORT)

µC

RP*

SDA

SCL

PCTLZ

DS2482-100

AD0

IO

AD1

CURRENT-LIMITING

RESISTOR

REFER TO APPLICATION

NOTE 4206

OPTIONAL

CIRCUITRY

1-Wire LINE

1-Wire

DEVICE

1-Wire

DEVICE

1-Wire

DEVICE

*RP = I2C PULLUP RESISTOR (SEE THE APPLICATIONS INFORMATION SECTION FOR RP SIZING).

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

19-4930; Rev 10; 1/15

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