SX8744 데이터 시트보기 (PDF) - Semtech Corporation
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SX8744 Datasheet PDF : 24 Pages
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SX8733/SX8743/SX8744
Digital temperature sensor
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1.4. SMBus Timing Characteristics
Parameter
SMBus clock frequency
Symbol
fSMB
Conditions
Min
Typ
Max
Unit
10
400
kHz
SMBus clock low time
tLOW
1.3
us
SMBus clock high time
tHIGH
0.6
us
SMBus rise time
tR,SMB
300
ns
SMBus fall time
tF,SMB
300
ns
SMBDAT and SMBCLK time low
for reset of serial interface
tTIMEOUT
25
35
ms
Data setup time
tSU,DAT
100
ns
Data hold time1
tHD,DAT
0
ns
Start condition hold time
(SMBDAT low to SMBCLK low)
tHD,STA
0.6
us
Stop condition hold time
(SMBCLK high to SMBDAT high)
tSU,STO
0.6
us
Repeated start-condition setup
time
(SMBCLK high to SMBDAT low)
tSU,STA
0.6
us
SMBus free time between stop
tBUF
and start conditions
1.3
us
1. The device provides a hold time of at least 300ns for the SMBDAT signal to bridge the undefined region of the falling edge of SMBCLK.
1.5. SMBus Timing Waveforms
SMBDAT
SMBCLK
tSU,STA tHD,STA
Start
tLOW
tHIGH
tHD,DAT tSU,DAT
Figure 1. SMBUS Timing
tSU,STO
tBUF
Stop
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 5
www.semtech.com
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