Rainbow-electronics DS2422 Bedienungsanleitung PDF herunterladen (Seite 4)

DS2422

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Note 1:

System Requirement

Note 2:

Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and 1-Wire recovery times. The

specified value here applies to systems with only one device and with the minimum 1-Wire recovery times. For more heavily

loaded systems, an active pullup such as that found in the DS2480B may be required.

Note 3:

Capacitance on the data pin could be 800pF when V

PUP

is first applied. If a 2.2kW resistor is used to pull up the data line, 2.5µs

after V

PUP

has been applied the parasite capacitance will not affect normal communications.

Note 4:

Guaranteed by design, not production tested.

Note 5:

, V

are a function of the internal supply voltage.

Note 6:

Voltage below which, during a falling edge on I/O, a logic '0' is detected.

Note 7:

The voltage on I/O needs to be less or equal to V

ILMAX

whenever the master drives the line low.

Note 8:

Voltage above which, during a rising edge on I/O, a logic '1' is detected.

Note 9:

After V

is crossed during a rising edge on I/O, the voltage on I/O has to drop by V

to be detected as logic '0'.

Note 10:

The I-V characteristic is linear for voltages less than 1V.

Note 11:

The earliest recognition of a negative edge is possible at t

REH

after V

has been previously reached.

Note 12:

Highlighted numbers are NOT in compliance with the published iButton standards. See comparison table below.

Note 13:

Interval during the negative edge on I/O at the beginning of a Presence Detect pulse between the time at which the voltage is

90% of V

PUP

and the time at which the voltage is 10% of V

PUP

Note 14:

e represents the time required for the pullup circuitry to pull the voltage on I/O up from V

to V

Note 15:

d represents the time required for the pullup circuitry to pull the voltage on I/O up from V

to the input high threshold of the bus

master.

Note 16:

This is the expected range when using a crystal equivalent to the KDS SN14J (12.5pF).

Note 17:

Time to reach 63% of the temperature change; measured at a temperature transition step from +25°C to +85°C.

Note 18:

A 2-point calibration trim at 3V must be done to achieve the specified accuracy at 3V. An application note is available to help

developers perform the calibration by writing the trim registers to properly orient the error curve.

Note 19:

The duration is user-programmable from 0ms (code 00h) to 127.5ms (code FFh) with a tolerance of ±0.5ms. See Delay Register,

address 400h, for details.

STANDARD VALUES DS2422 VALUES

PARAMETER STANDARD SPEED OVERDRIVE SPEED STANDARD SPEED OVERDRIVE SPEED

NAME MIN MAX MIN MAX MIN MAX MIN MAX

SLOT

(incl. t

REC

) 61µs (undef.) 7µs (undef.) 65µs

(undef.) 9.5µs (undef.)

RSTL

480µs (undef.) 48µs 80µs 690µs 720µs 70µs 80µs

PDH

15µs 60µs 2µs 6µs 15µs

63.5µs 2µs 7µs

PDL

60µs 240µs 8µs 24µs 60µs 287µs 7µs 28µs

W0L

60µs 120µs 6µs 16µs 60µs 120µs 7.5µs 12µs

Intentional change, longer recovery time requirement due to modified 1-Wire front end.

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