Rainbow-electronics DS28EA00 Bedienungsanleitung PDF herunterladen (Seite 2)

DS28EA00 1-Wire Digital Thermometer with Sequence Detect and PIO

2 of 29

ABSOLUTE MAXIMUM RATINGS

IO Voltage to GND -0.5V, +6V

IO Sink Current 20mA

Maximum PIOA or PIOB Pin Current 20mA

Maximum Current Through GND Pin 40mA

Operating Temperature Range -40°C to +85°C

Junction Temperature +150°C

Storage Temperature Range -40°C to +85°C

Soldering Temperature See IPC/JEDEC J-STD-020

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is

not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.

ELECTRICAL CHARACTERISTICS

= -40°C to +85°C; see Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power Supply

Supply Voltage V

(Note 2) 3.0 5.5 V

Supply Current (Note 5) I

= 5.5V 1.5 mA

Standby Current I

DDS

= 5.5V 1.5 µA

IO Pin General Data

Local power 3.0 V

1-Wire Pullup Voltage

(Note 2)

PUP

Parasite power 3.0 5.5

1-Wire Pullup Resistance R

PUP

(Notes 2, 3)

0.3 2.2

kΩ

Input Capacitance C

(Notes 4, 5) 1000 pF

Input Load Current I

IO pin at V

PUP

0.1 1.5 µA

High-to-Low Switching

Threshold

(Notes 5, 6, 7) 0.46

PUP

1.9V

Parasite powered 0.5 Input Low Voltage (Notes

2, 8)

powered (Note 5) 0.7

Low-to-High Switching

Threshold (Notes 5, 6, 9)

Parasite power 1.0

PUP

1.1V

Switching Hysteresis

(Notes 5, 6, 10)

Parasite power 0.21 1.7 V

Output Low Voltage

(Note 11)

At 4mA 0.4 V

Standard speed, R

PUP

= 2.2kΩ

Overdrive speed, R

PUP

= 2.2kΩ

Recovery Time

(Notes 2, 12)

REC

Overdrive speed, directly prior to reset

pulse; R

PUP

= 2.2kΩ

µs

Standard speed 0.5 5.0 Rising-Edge Hold-Off Time

(Notes 5, 13)

REH

Overdrive speed Not applicable (0)

µs

Standard speed 65 Timeslot Duration

(Notes 2, 14)

SLOT

Overdrive speed 8

µs

IO Pin, 1-Wire Reset, Presence Detect Cycle

Standard speed 480 640

Reset Low Time (Note 2) t

RSTL

Overdrive speed 48 80

µs

Standard speed 15 60 Presence-Detect High

Time

PDH

Overdrive speed 2 6

µs

Standard speed 1.125 8.1 Presence-Detect Fall Time

(Notes 5, 15)

FPD

Overdrive speed 0 1.3

µs

Standard speed 60 240 Presence-Detect Low

Time

PDL

Overdrive speed 8 24

µs

Standard speed 68.1 75 Presence-Detect Sample

Time (Notes 2,16)

MSP

Overdrive speed 7.3 10

µs

1 2 3 4 5 6 7 ... 28 29

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