Rainbow-electronics DS1822-PAR Instrukcja Użytkownika Pobierz pdf (Strona 18)

DS1822-PAR

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AC ELECTRICAL CHARACTERISTICS: (-55°C to +100°C; V

=3.0V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

CONV

9-bit resolution 93.75 ms 1

10-bit resolution 187.5 ms 1

11-bit resolution 375 ms 1

Temperature Conversion

Time

12-bit resolution 750 ms 1

Time to Strong Pullup

SPON

Start Convert T

Command Issued

10 µs

Time Slot t

SLOT

60 120 µs 1

Recovery Time t

REC

1 µs 1

Write 0 Low Time r

LOW0

60 120 µs 1

Write 1 Low Time t

LOW1

1 15 µs 1

Read Data Valid t

RDV

15 µs 1

Reset Time High t

RSTH

480 µs 1

Reset Time Low t

RSTL

480 960 µs 1,2

Presence Detect High t

PDHIGH

15 60 µs 1

Presence Detect Low t

PDLOW

60 240 µs 1

Capacitance C

IN/OUT

25 pF

NOTES:

1. Refer to timing diagrams in Figure 16.

2. If t

RSTL

> 960 µs, a power on reset may occur.

TYPICAL PERFORMANCE CURVE Figure 15

DS1822-PAR DIGITAL THERMOMETER AND THERMOSTAT

TEMPERATURE READING ERROR

“TBA”

1 2 ... 13 14 15 16 17 18 19

2 3 1
64-BIT LASERED ROM CODE 5
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7 of 19 7
TRANSACTION SEQUENCE 8
INITIALIZATION 8
ROM COMMANDS 8
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DS1822-PAR 10
10 of 19 10
11 of 19 11
12 of 19 12
1-WIRE SIGNALING 13
READ/WRITE TIME SLOTS 13
WRITE TIME SLOTS 13
OF SLOT 14
as short as possible 15
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17 of 19 17
=3.0V to 5.5V) 18
TIMING DIAGRAMS Figure 16 19

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