DS1629

21 of 22

102299

DC ELECTRICAL CHARACTERISTICS:

DIGITAL THERMOMETER

(-55°C to +125°C; 2.7V

≤V

DD

≤5.5V)

PARAMETER

SYMBOL

CONDITION

MIN

TYP

MAX

UNITS

NOTES

DS1629 Thermometer

Error

-10°C to

+85°C

2.7V

≤V

DD

≤5.5V

±2.0

°C

6

Resolution

0.03

0.5

°C

7

Conversion Time

400

1000

ms

AC ELECTRICAL CHARACTERISTICS:

2-WIRE INTERFACE

(-55°C to +125°C; 2.2V

≤V

DD

≤5.5V)

PARAMETER

SYMBOL

CONDITION

MIN

TYP

MAX

UNITS

NOTES

SCL Clock Period

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

5

pF

Crystal Capacitance

12.5

pF

9

NOTES:

1.

All voltages are referenced to ground, unless otherwise noted.

2.

3.

4.

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

5.

6.

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

Thermometer error is specified for 2.7V

≤ V

DD

≤ 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.