DS2450 Dallas Semiconducotr, DS2450 Datasheet

DS2450

Manufacturer Part Number

DS2450

Description

1-Wire Quad A/D Converter

Manufacturer

Dallas Semiconducotr

Datasheet

1.DS2450.pdf (24 pages)

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FEATURES

§ Four high-impedance inputs to measure

§ User programmable input range (2.56V,

§ 5V, single supply operation

§ Very low power: 2.5 mW active, 25 W idle

§ Built-in multidrop controller allows multiple

§ Responds to Conditional Search if the analog

§ Channels not used as analog input can serve

§ Directly connects to a single port pin of a

§ Overdrive mode boosts communication speed

§ On-chip 16-bit CRC-generator for

§ Unique, factory-lasered and tested 64-bit

§ 8-bit family code specifies device

§ Operating temperature range from -40 C to

§ Compact, low cost 8-pin SOIC surface mount

DESCRIPTION

The DS2450 1-Wire Quad A/D Converter is based on a successive-approximation analog to digital

converter with a four to one analog multiplexer. Each input channel has its own register set to store the

input voltage range, resolution, and alarm threshold values as well as flags to enable participation of the

device in the conditional search if the input voltage leaves the specified range. Two alarm flags for each

channel indicate if the voltage measured was too high or too low without requiring the bus master to do

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analog voltages over the 1-Wire bus

5.12V), resolution (1 to 16 bits) and alarm

thresholds

DS2450’ s to be identified and operated on a

common 1-Wire bus

voltage crosses the alarm thresholds

as open drain digital outputs for closed-loop

control

microprocessor and communicates at up to

16.3k bits per second

to 142k bits per second

safeguarding data transfers

registration number (8-bit family code + 48-

bit serial number 8-bit CRC tester) assures

absolute traceability because no two parts are

alike

communication requirements to bus master

+85 C

package

1 of 24

1-Wire

PIN ASSIGNMENT

PIN DESCRIPTION

DATA

GND

AIN-A

AIN-B

AIN-C

AIN-D

ORDERING INFORMATION

DS2450S

DATA

GND

8-PIN SOIC (208 MIL)

Quad A/D Converter

4.5 to 5.5 Volts

Do Not Connect

1-Wire Bus

Ground

Analog Input A

Analog Input B

Analog Input C

Analog Input D

8-pin SOIC

AIN-D

AIN-C

AIN-B

AIN-A

DS2450

102199

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