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LM95231 Datasheet(PDF) 6 Page - Texas Instruments

Part No. LM95231
Description  Precision Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm??Technology
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM95231 Datasheet(HTML) 6 Page - Texas Instruments

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VIH
VIL
SMBCLK
P
S
VIH
VIL
SMBDAT
tBUF
tHD;STA
tLOW
tR
tHD;DAT
tHIGH
tF
tSU;DAT
tSU;STA
tSU;STO
P
S
LM95231
SNIS139E – FEBRUARY 2005 – REVISED MARCH 2013
www.ti.com
Logic Electrical Characteristics SMBus
Digital Switching Characteristics
Unless otherwise noted, these specifications apply for VDD=+3.0 Vdc to +3.6 Vdc, CL (load capacitance) on output lines = 80
pF. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = +25°C, unless otherwise noted.
The switching characteristics of the LM95231 fully meet or exceed the published specifications of the SMBus version 2.0. The
following parameters are the timing relationships between SMBCLK and SMBDAT signals related to the LM95231. They
adhere to but are not necessarily the SMBus bus specifications.
Symbol
Parameter
Conditions
Typical(1)
Limits(2)
Units
(Limit)
fSMB
SMBus Clock Frequency
100
kHz (max)
10
kHz (min)
tLOW
SMBus Clock Low Time
from VIN(0)max to VIN(0)max
4.7
µs (min)
25
ms (max)
tHIGH
SMBus Clock High Time
from VIN(1)min to VIN(1)min
4.0
µs (min)
tR,SMB
SMBus Rise Time
See(3)
1
µs (max)
tF,SMB
SMBus Fall Time
See(4)
0.3
µs (max)
tOF
Output Fall Time
CL = 400pF,
250
ns (max)
IO = 3mA
(4)
tTIMEOUT
SMBDAT and SMBCLK Time Low for Reset of
25
ms (min)
Serial Interface(5)
35
ms (max)
tSU;DAT
Data In Setup Time to SMBCLK High
250
ns (min)
tHD;DAT
Data Out Stable after SMBCLK Low
300
ns (min)
1075
ns (max)
tHD;STA
Start Condition SMBDAT Low to SMBCLK Low
100
ns (min)
(Start condition hold before the first clock falling
edge)
tSU;STO
Stop Condition SMBCLK High to SMBDAT Low
100
ns (min)
(Stop Condition Setup)
tSU;STA
SMBus Repeated Start-Condition Setup Time,
0.6
µs (min)
SMBCLK High to SMBDAT Low
tBUF
SMBus Free Time Between Stop and Start
1.3
µs (min)
Conditions
(1)
Typicals are at TA = 25°C and represent most likely parametric norm at time of product characterization. The typical specifications are
not ensured.
(2)
Limits are specified to AOQL (Average Outgoing Quality Level).
(3)
The output rise time is measured from (VIN(0)max + 0.15V) to (VIN(1)min − 0.15V).
(4)
The output fall time is measured from (VIN(1)min - 0.15V) to (VIN(1)min + 0.15V).
(5)
Holding the SMBDAT and/or SMBCLK lines Low for a time interval greater than tTIMEOUT will reset the LM95231's SMBus state machine,
therefore setting SMBDAT and SMBCLK pins to a high impedance state.
Figure 2. SMBus Communication
6
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LM95231


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