Rainbow Electronics DS1629 User Manual
Page 21
DS1629
21 of 22
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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
T
ERR
-10°C to
+85°C
2.7V
≤
V
DD
≤
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
DD
≤
5.5V)
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
NOTES
SCL Clock Period
t
1
2.5
µs
Data In Setup Time to
SCL High
t
2
100
ns
Data Out Stable after
SCL Low
t
3
0
ns
SDA Low Setup
Time to SCL
Low (START)
t
4
100
ns
SDA High Hold
Time After SCL
High (STOP)
t
5
100
ns
Capacitance Load for
each Bus Line
C
b
400
pF
8
Input Capacitance
C
I
5
pF
Crystal Capacitance
C
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
DD
=5.0V and 1.5 mA at V
DD
=2.2V.
3.
I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V
DD
is switched off.
4.
Standby current specified with temperature conversions and clock oscillator/buffer shut down,
ALRM pin open, and SDA, SCL = V
DD
, 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
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.