Rainbow Electronics DS1721 - Manual (Page 15)

DS1721
15 of 16
DC ELECTRICAL CHARACTERISTICS:
DIGITAL THERMOMETER
(-55°C to +125°C; 2.7V
≤
V
DD
≤
5.5V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
DS1721
Thermometer Error
T
ERR
-10°C to +85°C ±1.0 °C 5
Resolution 9 12 bits
9-bit
Conversions
125 150
10-bit
Conversions
250 300
11-bit
Conversions
500 600
Conversion Time t
CONVT
12-bit
Conversions
1000 1200
ms
AC ELECTRICAL CHARACTERISTICS:
2-WIRE INTERFACE
(-55°C to +125°C; V
DD
=2.7V to 5.5V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
SCL Clock
Frequency
f
SCL
Fast Mode
Standard Mode
0
0 400
100
KHz
Bus Free Time
Between a STOP
and START
Condition
t
BUF
Fast Mode
Standard Mode
1.3
4.7
µs
Hold Time
(Repeated) START
Condition
t
HD:STA
Fast Mode
Standard Mode
0.6
4.0
µs 6
Low Period of
SCL Clock
t
LOW
Fast Mode
Standard Mode
1.3
4.7
µs
High Period of
SCL Clock
t
HIGH
Fast Mode
Standard Mode
0.6
4.0
µs
Setup Time for a
Repeated START
Condition
t
SU:STA
Fast Mode
Standard Mode
0.6
4.7
µs
Data Hold Time t
HD:DAT
Fast Mode
Standard Mode
0
0
0.9 µs 7
Data Set-up Time t
SU:DAT
Fast Mode
Standard Mode
100
250
ns 8
Rise Time of both
SDA and SCL
Signals
t
R
Fast Mode
Standard Mode
20+0.1
C
B
300
1000
ns 8
Fall Time of both
SDA and SCL
Signals
t
F
Fast Mode
Standard Mode
20+0.1
C
B
300
1000
ns 9
Set-up time for
STOP Condition
t
SU:STO
Fast Mode
Standard Mode
0.6
4.0
µs
Capacitive Load for
each Bus Line
C
b
400 pF 9
Input Capacitance C
I
5 pF