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102199

FEATURES

§ Four high-impedance inputs to measure

analog voltages over the 1-Wire bus

§ User programmable input range (2.56V,

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

thresholds

§ 5V, single supply operation

§ Very low power: 2.5 mW active, 25

µW idle

§ Built-in multidrop controller allows multiple

DS2450’s to be identified and operated on a

common 1-Wire bus

§ Responds to Conditional Search if the analog

voltage crosses the alarm thresholds

§ Channels not used as analog input can serve

as open drain digital outputs for closed-loop

control

§ Directly connects to a single port pin of a

microprocessor and communicates at up to

16.3k bits per second

§ Overdrive mode boosts communication speed

to 142k bits per second

§ On-chip 16-bit CRC-generator for

safeguarding data transfers

§ Unique, factory-lasered and tested 64-bit

registration number (8-bit family code + 48-

bit serial number 8-bit CRC tester) assures

absolute traceability because no two parts are

alike

§ 8-bit family code specifies device

communication requirements to bus master

§ Operating temperature range from -40

°C to

+85

°C

§ Compact, low cost 8-pin SOIC surface mount

package

PIN ASSIGNMENT

PIN DESCRIPTION

4.5 to 5.5 Volts

NC

Do Not Connect

DATA

1-Wire Bus

GND

Ground

AIN-A

Analog Input A

AIN-B

Analog Input B

AIN-C

Analog Input C

AIN-D

Analog Input D

ORDERING INFORMATION

DS2450S

8-pin SOIC

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

DS2450

1-Wire

www.dalsemi.com

NC

DATA

GND

AIN-A

AIN-B

AIN-C

AIN-D

2

3

4

8

7

6

5

1

8-PIN SOIC (208 MIL)