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LM90 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM90
Description  3 Degree Celcious Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM90 Datasheet(HTML) 5 Page - National Semiconductor (TI)

 
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Temperature-to-Digital Converter Characteristics (Continued)
Unless otherwise noted, these specifications apply for V
DD=+3.0Vdc to 3.6Vdc. Boldface limits apply for TA =TJ =
T
MIN≤TA≤TMAX; all other limits TA=TJ=+25˚C, unless otherwise noted.
Parameter
Conditions
Typical
Limits
Units
(Note 6)
(Note 7)
(Limit)
Local and Remote T_CRIT Default
Temperature Setting
(Note 11)
+85
˚C
Logic Electrical Characteristics
DIGITAL DC CHARACTERISTICS
Unless otherwise noted, these specifications apply for V
DD=+3.0 to 3.6 Vdc. Boldface limits apply for TA =TJ =TMIN to
T
MAX; all other limits TA=TJ=+25˚C, unless otherwise noted.
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 6)
(Note 7)
(Limit)
SMBData, SMBCLK INPUTS
V
IN(1)
Logical “1” Input Voltage
2.1
V (min)
V
IN(0)
Logical “0”Input Voltage
0.8
V (max)
V
IN(HYST)
SMBData and SMBCLK Digital
Input Hysteresis
400
mV
I
IN(1)
Logical “1” Input Current
V
IN =VDD
0.005
±10
µA (max)
I
IN(0)
Logical “0” Input Current
V
IN = 0 V
−0.005
±10
µA (max)
C
IN
Input Capacitance
5
pF
ALL DIGITAL OUTPUTS
I
OH
High Level Output Current
V
OH =VDD
10
µA (max)
V
OL
SMBus Low Level Output Voltage
I
OL = 4mA
I
OL = 6mA
0.4
0.6
V (max)
SMBus DIGITAL SWITCHING CHARACTERISTICS
Unless otherwise noted, these specifications apply for V
DD=+3.0 Vdc to +3.6 Vdc, CL (load capacitance) on output lines = 80
pF. Boldface limits apply for T
A =TJ =TMIN to TMAX; all other limits TA =TJ = +25˚C, unless otherwise noted.
The switching characteristics of the LM90 fully meet or exceed the published specifications of the SMBus version 2.0. The fol-
lowing parameters are the timing relationships between SMBCLK and SMBData signals related to the LM90. They adhere to
but are not necessarily the SMBus bus specifications.
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 6)
(Note 7)
(Limit)
f
SMB
SMBus Clock Frequency
100
10
kHz (max)
kHz (min)
t
LOW
SMBus Clock Low Time
from V
IN(0)max to
V
IN(0)max
4.7
25
µs (min)
ms (max)
t
HIGH
SMBus Clock High Time
from V
IN(1)min to VIN(1)min
4.0
µs (min)
t
R,SMB
SMBus Rise Time
(Note 12)
1
µs (max)
t
F,SMB
SMBus Fall Time
(Note 13)
0.3
µs (max)
t
OF
Output Fall Time
C
L = 400pF,
I
O = 3mA, (Note 13)
250
ns (max)
t
TIMEOUT
SMBData and SMBCLK Time Low for
Reset of Serial Interface (Note 14)
25
35
ms (min)
ms (max)
t
SU;DAT
Data In Setup Time to SMBCLK High
250
ns (min)
t
HD;DAT
Data Out Stable after SMBCLK Low
300
900
ns (min)
ns (max)
t
HD;STA
Start Condition SMBData Low to SMBCLK
Low (Start condition hold before the first
clock falling edge)
100
ns (min)
t
SU;STO
Stop Condition SMBCLK High to SMBData
Low (Stop Condition Setup)
100
ns (min)
www.national.com
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