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ADT75ARMZ

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ADT75 Data Sheet
Rev. B | Page 6 of 24
TIMING SPECIFICATIONS AND DIAGRAM
Measure the SDA and SCL timing with the input filters turned on to meet the fast mode I
2
C specification. Switching off the input filters
improves the transfer rate but has a negative effect on the EMC behavior of the part.
T
A
= T
MIN
to T
MAX
, V
DD
= 2.7 V to 5.5 V, unless otherwise noted.
Table 3.
Parameter
1
Min Typ Max Unit Test Conditions/Comments
Serial Clock Period, t
1
2.5 µs Fast mode I
2
C. See Figure 2
Data In Setup Time to SCL High, t
2
50 ns See Figure 2
Data Out Stable After SCL Low, t
3
0 0.9
2
ns Fast mode I
2
C. See Figure 2
Data Out Stable After SCL Low, t
3
0 3.45
2
µs Standard mode I
2
C. See Figure 2
SDA Low Setup Time to SCL Low (Start Condition), t
4
50 ns See Figure 2
SDA High Hold Time After SCL High (Stop Condition), t
5
50 ns See Figure 2
SDA and SCL Rise Time, t
6
300 ns Fast mode I
2
C. See Figure 2
SDA and SCL Rise Time, t
6
1000 ns Standard mode I
2
C. See Figure 2
SDA and SCL Fall Time, t
7
300 ns See Figure 2
Capacitive Load for each Bus Line, C
B
400
pF
1
Guaranteed by design and characterization; not production tested.
2
This time has to be met only if the master does not stretch the low period of the SCL signal.
SCL
t
4
t
2
t
1
t
3
t
5
t
7
SDA
DATA IN
SDA
DATA OUT
t
6
05326-002
Figure 2. SMBus/I
2
C Timing Diagram
Data Sheet ADT75
Rev. B | Page 7 of 24
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter Rating
V
DD
to GND –0.3 V to +7 V
SDA Input Voltage to GND –0.3 V to V
DD
+ 0.3 V
SDA Output Voltage to GND –0.3 V to V
DD
+ 0.3 V
SCL Input Voltage to GND –0.3 V to V
DD
+ 0.3 V
OS/ALERT Output Voltage to GND –0.3 V to V
DD
+ 0.3 V
Operating Temperature Range –55°C to +150°C
Storage Temperature Range –65°C to +160°C
Maximum Junction Temperature, T
JMAX
150.7°C
8-Lead MSOP (RM-8)
Power Dissipation
1, 2
W
MAX
= (T
JMAX
− T
A
)/θ
JA
Thermal Impedance
3
θ
JA
, Junction-to-Ambient (Still Air) 205.9°C/W
θ
JC
, Junction-to-Case
43.74°C/W
8-Lead SOIC (R-8)
Power Dissipation
1, 2
W
MAX
= (T
JMAX
− T
A
)/θ
JA
Thermal Impedance
3
θ
JA
, Junction-to-Ambient (Still Air) 157°C/W
θ
JC
, Junction-to-Case 56°C/W
IR Reflow Soldering
Peak Temperature 220°C (0°C/5°C)
Time at Peak Temperature 10 sec to 20 sec
Ramp-Up Rate 3°C/sec maximum
Ramp-Down Rate –6°C/sec maximum
Time 25°C to Peak Temperature 6 minutes maximum
IR Reflow Soldering (Pb-Free Package)
Peak Temperature 260°C (+0°C)
Time at Peak Temperature 20 sec to 40 sec
Ramp-Up Rate 3°C/sec maximum
Ramp-Down Rate –6°C/sec maximum
Time 25°C to Peak Temperature
8 minutes maximum
1
Values relate to package being used on a standard 2-layer PCB. This gives a
worst case θ
JA
and θ
JC
. Refer to Figure 3 for a plot of maximum power
dissipation vs. ambient temperature (T
A
).
2
T
A
= ambient temperature.
3
Junction-to-case resistance is applicable to components featuring a
preferential flow direction, for example, components mounted on a heat
sink. Junction-to-ambient resistance is more useful for air-cooled, PCB-
mounted components.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
TEMPERATURE (°C)
MAXIMUM POWER DISSIPATION (Watts)
1.2
0.8
1.0
0.6
0.2
0.4
0
–55
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
05326-003
MAX PD = 3.4mW AT 150°C
Figure 3. MSOP Maximum Power Dissipation vs. Ambient Temperature
ESD CAUTION
ADT75 Data Sheet
Rev. B | Page 8 of 24
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
SDA
1
SCL
2
OS/ALERT
3
GND
4
V
DD
8
A0
7
A1
6
A2
5
ADT75
TOP VIEW
(Not to Scale)
05326-004
Figure 4. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1
SDA
SMBus/I
2
C Serial Data Input/Output. Serial data that is loaded into and read from the ADT75 registers is provided
on this pin. Open-drain configuration; needs a pull-up resistor.
2 SCL Serial Clock Input. This is the clock input for the serial port. The serial clock is used to clock in and clock out data to
and from any register of the ADT75. Open-drain configuration; needs a pull-up resistor.
3 OS/ALERT Over- and Undertemperature Indicator. Default power as an OS pin. Open-drain configuration; needs a pull-up resistor.
4 GND Analog and Digital Ground.
5 A2 SMBus/I
2
C Serial Bus Address Selection Pin. Logic input. Can be set to GND or V
DD
.
6 A1 SMBus/I
2
C Serial Bus Address Selection Pin. Logic input. Can be set to GND or V
DD
.
7 A0 SMBus/I
2
C Serial Bus Address Selection Pin. Logic input. Can be set to GND or V
DD
.
8 V
DD
Positive Supply Voltage, 2.7 V to 5.5 V. Decouple the supply to ground.
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ADT75ARMZ

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Manufacturer:
Analog Devices Inc.
Description:
Board Mount Temperature Sensors 1 Deg C Accurate 12-Bit Digital
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