Rainbow-electronics DS2770 Bedienungsanleitung PDF herunterladen (Seite 27)

DS2770

27 of 27

ELECTRICAL CHARACTERISTICS:

1-WIRE INTERFACE

(-20°C to 70°C, 2.7V £ V

£ 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

Time Slot t

SLOT

60 120 ms

Recovery Time t

REC

1 ms

Write 0 Low Time t

LOW0

60 120 ms

Write 1 Low Time t

LOW1

115ms

Read Data Valid t

RDV

15 ms

Reset Time High t

RSTH

480 ms

Reset Time Low t

RSTL

480 960 ms

Presence Detect High t

PDH

15 60 ms

Presence Detect Low t

PDL

60 240 ms

DQ Capacitance C

25 pF

NOTES

1) All voltages are referenced to ground.

Self-heating due to output pin loading; sense resistor power dissipation will alter the reading from

ambient conditions.

Using the internal current-sense resistor.

Using an external current-sense resistor.

Typical value for t

ERR

is at 3.6V and +25°C.

See Ordering Information section of data sheet to determine corresponding part number for each V

value.

This specification includes the effects of temperature on the sense resistor. The DS2770 compensates

for the internal sense resistor’s temperature coefficient of 3700ppm/°C to an accuracy of

±500ppm/°C. The DS2770 does not attempt to compensate for the characteristics of an external sense

resistor. Error terms arising from the use of an external sense resistor should be taken into account

when calculating total current measurement error.

Four-year data retention at +70°C.

SLEEP

, I

ACTIVE

and I

VCH

are measured with the CC and UV pins floating.

10)

is the greater of V

or VCH. V

OH,CC\

and V

OH,UV\

test conditions: VDD = 5.5, VCH = 5.7V

11)

The UV and CC pins are driven low with respect to the SNS pin. Current flow into UV or CC is

returned to SNS and therefore is not included in the current measurement.

12)

Current full-scale rating limits input saturation and nonlinear conversion under high average current

signal levels of either polarity. Transient currents up to 1.5 times the current full-scale rating are

measured to specified accuracy if the RC filter formed by the internal resistors and external capacitor

at the IS1 and IS2 pins limits the average signal level to the Current Full-Scale rating.

13)

This value deviates proportionally to gain error.

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