Rainbow-electronics DS1721 Bedienungsanleitung PDF herunterladen (Seite 15)

DS1721

15 of 16

DC ELECTRICAL CHARACTERISTICS:

DIGITAL THERMOMETER (-55°C to +125°C; 2.7V ≤ V

≤ 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

DS1721

Thermometer Error

ERR

-10°C to +85°C ±1.0 °C 5

Resolution 9 12 bits

9-bit

Conversions

125 150

10-bit

Conversions

250 300

11-bit

Conversions

500 600

Conversion Time t

CONVT

12-bit

Conversions

1000 1200

AC ELECTRICAL CHARACTERISTICS:

2-WIRE INTERFACE (-55°C to +125°C; V

=2.7V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

SCL Clock

Frequency

SCL

Fast Mode

Standard Mode

400

100

KHz

Bus Free Time

Between a STOP

and START

Condition

BUF

Fast Mode

Standard Mode

1.3

4.7

µs

Hold Time

(Repeated) START

Condition

HD:STA

Fast Mode

Standard Mode

0.6

4.0

µs 6

Low Period of

SCL Clock

LOW

Fast Mode

Standard Mode

1.3

4.7

µs

High Period of

SCL Clock

HIGH

Fast Mode

Standard Mode

0.6

4.0

µs

Setup Time for a

Repeated START

Condition

SU:STA

Fast Mode

Standard Mode

0.6

4.7

µs

Data Hold Time t

HD:DAT

Fast Mode

Standard Mode

0.9 µs 7

Data Set-up Time t

SU:DAT

Fast Mode

Standard Mode

100

250

ns 8

Rise Time of both

SDA and SCL

Signals

Fast Mode

Standard Mode

20+0.1

300

1000

ns 8

Fall Time of both

SDA and SCL

Signals

Fast Mode

Standard Mode

20+0.1

300

1000

ns 9

Set-up time for

STOP Condition

SU:STO

Fast Mode

Standard Mode

0.6

4.0

µs

Capacitive Load for

each Bus Line

400 pF 9

Input Capacitance C

5pF

1 2 ... 10 11 12 13 14 15 16

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