Table 1. detailed pin description – Rainbow Electronics DS75LV User Manual
Page 3
DS75LV: Digital Thermometer and Thermostat
3
of
13
Falling SCL
Low Period of SCL
t
LOW
(Note
5)
1.3
ms
High Period of SCL
t
HIGH
(Note
5)
0.6
ms
Repeated START Condition
Setup Time to Rising SCL
t
SU:STA
(Note 5)
600
ns
Data-Out Hold Time from
Falling SCL
t
HD:DAT
(Notes 5, 8)
0
0.9 ms
Data-In Setup Time to
Rising SCL
t
SU:DAT
(Note 5)
100
ns
Rise Time of SDA and SCL
(Receive)
t
R
(Notes 5, 7)
20 + 0.1C
B
300
ns
Fall Time of SDA and SCL
(Receive)
t
F
(Notes 5, 7)
20 +
0.1C
B
300 ns
Spike Suppression Filter
Time (Deglitch Filter)
t
SS
0
50 ns
STOP Setup Time to Rising
SCL
t
SU:STO
(Note 5)
600
ns
Capacitive Load for Each
Bus Line
C
B
400 pF
Input Capacitance
C
I
5 pF
Serial Interface Reset Time
t
TIMEOUT
SDA time low (Note 9)
75
325
ms
Note 1:
All voltages are referenced to ground.
Note 2:
Internal heating caused by O.S. loading will cause the DS75LV to read approximately 0.5
°C higher if O.S. is sinking the max rated
current.
Note 3:
I
DD
specified with O.S. pin open.
Note 4:
I
DD
specified with V
DD
at 3.0V and SDA, SCL = 3.0V, 0
°C to 70°C.
Note 5:
See Timing Diagram in Figure 2. All timing is referenced to 0.9 x V
DD
and 0.1 x V
DD
.
Note 6:
After this period, the first clock pulse is generated.
Note 7:
For example, if C
B
= 300pF, then t
R
[min] = t
F
[min] = 50ns.
Note 8:
The DS75LV provides an internal hold time of at least 75ns on the SDA signal to bridge the undefined region of SCL's falling edge.
Note 9:
This time-out applies only when the DS75LV is holding SDA low. Other devices can hold SDA low indefinitely and the DS75LV will
not reset.
Note
10:
The DS75LV has a maximum operating voltage of 3.7V. Contact Dallas Semiconductor for information on the availability of a 3.7V to
5.5V version of the DS75LV.
Table 1. Detailed Pin Description
PIN
SYMBOL
PIN DESCRIPTION
1 SDA
Data Input/Output. For 2-wire serial communication port. Open-drain.
2 SCL
Clock Input. 2-wire serial communication port.
3 O.S.
Thermostat Output. Open-drain.
4 GND
Ground
5 A
2
Address Input
6 A
1
Address Input
7 A
0
Address Input
8 V
DD
Supply Voltage. +1.7V to +3.7V supply pin.