Rainbow-electronics DS1629 Manual do Utilizador descarregar pdf (Página 21)

DS1629

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DC ELECTRICAL CHARACTERISTICS:

DIGITAL THERMOMETER (-55°C to +125°C; 2.7V ≤ V

≤ 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

DS1629 Thermometer

Error

ERR

-10°C to

+85°C

2.7V ≤ V

≤ 5.5V

±2.0 °C 6

Resolution 0.03 0.5 °C 7

Conversion Time t

CONVT

400 1000 ms

AC ELECTRICAL CHARACTERISTICS:

2-WIRE INTERFACE (-55°C to +125°C; 2.2V ≤ V

≤ 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

SCL Clock Period t

2.5 µs

Data In Setup Time to

SCL High

100 ns

Data Out Stable after

SCL Low

0 ns

SDA Low Setup

Time to SCL

Low (START)

100 ns

SDA High Hold

Time After SCL

High (STOP)

100 ns

Capacitance Load for

each Bus Line

400 pF 8

Input Capacitance C

5 pF

Crystal Capacitance C

12.5 pF 9

NOTES:

1. All voltages are referenced to ground, unless otherwise noted.

2. Logic 0 voltage specified at a sink current of 4 mA at V

=5.0V and 1.5 mA at V

=2.2V.

3. I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V

is switched off.

4. Standby current specified with temperature conversions and clock oscillator/buffer shut down,

ALRM pin open, and SDA, SCL = V

, 0°C to +70°C.

5. I

DDX

specified with ALRM pin open, and 0°C to +70°C.

6. See typical accuracy curve for specification limits outside the temperature range indicated.

Thermometer error is specified for 2.7V ≤ V

≤ 5.5V. Accuracy will degrade approximately

0.5°C if ALRM is sinking the maximum current.

7. Thermometer resolution (in °C) = 1/COUNT_PER_C(T). The calibration algorithm is such that

COUNT_PER_C and thus resolution varies over temperature (but is constant at a given

temperature for a given device) and from device to device.

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