DS2422 datasheet(2/48 Pages) DALLAS

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DS2422

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ABSOLUTE MAXIMUM RATINGS*

ALARM, PUMP_ONZ, SDATA, SCLK, CNVST, VPAD,

I/O Voltage to GND

-0.3V, +6V

ALARM, PUMP_ONZ, I/O Combined Sink Current

20mA

Operating Temperature Range

-40°C to +85°C

Junction Temperature

+150°C

Storage Temperature Range

-55°C to +125°C

Soldering Temperature

See IPC/JEDEC J-STD-020A

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

(VPUP = 3.0V to 5.25V, VBAT = 2.0V to 3.6V, VPAD = 3.0V to 5.5V, TA = -40°C to +85°C.

)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

IBAT1

VBAT at 3.0V, I/O at 0V, RTC on

1200

2000

Standby Supply Current

IBAT0

VBAT at 3.6V, I/O at 0V, RTC off

650

Ground Current

IGND

Applies individually to GND, AGND

(Note 1)

I/O Pin General Data

1-Wire Pullup Resistance

RPUP

(Notes 1, 2)

2.2

Input Capacitance

CIO

(Notes 3, 4)

100

800

Input Load Current

I/O pin at VPUP, VBAT = 3.6V

µA

High-to-Low Switching

Threshold

VTL

(Notes 4, 5, 6)

0.4

3.2

Input Low Voltage

VIL

(Notes 1, 7)

0.3

Low-to-High Switching

Threshold

VTH

(Notes 4, 5, 8)

0.7

3.4

Switching Hysteresis

VHY

(Notes 4, 9)

0.09

N/A

Output Low Voltage

VOL

At 4mA (Note 10)

0.4

Standard speed, RPUP = 2.2k

Overdrive speed, RPUP = 2.2k

Recovery Time (Note 1)

tREC

Overdrive speed, directly prior to reset

pulse; RPUP = 2.2k

µs

Rising-Edge Hold-off Time

tREH

(Notes 4, 11)

0.6

2.0

µs

Standard speed

Overdrive speed, VPUP > 4.5V

Timeslot Duration (Note 1)

tSLOT

Overdrive speed (Note 12)

9.5

µs

I/O Pin, 1-Wire Reset, Presence Detect Cycle

Standard speed, VPUP > 4.5V

480

720

Standard speed (Note 12)

690

720

Overdrive speed, VPUP > 4.5V

Reset Low Time (Note 1)

tRSTL

Overdrive speed (Note 12)

µs

Standard speed, VPUP > 4.5V

Standard speed (Note 12)

63.5

Presence Detect High

Time

tPDH

Overdrive speed (Note 12)

µs

Standard speed, VPUP > 4.5V

1.5

Standard speed

1.5

Presence Detect Fall Time

(Notes 4, 13)

tFPD

Overdrive speed

0.15

µs

Standard speed, VPUP > 4.5V

240

Standard speed (Note 12)

287

Overdrive speed, VPUP > 4.5V

(Note 12)

Presence Detect Low

Time

tPDL

Overdrive speed (Note 12)

µs

Standard speed, VPUP > 4.5V

Standard speed

71.5

Presence Detect Sample

Time (Note 1)

tMSP

Overdrive speed

µs

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