LX1977IDU MICROSEMI [Microsemi Corporation], LX1977IDU Datasheet - Page 7

• Manufacturer Part Number: LX1977IDU
• Description: SMBus Ambient Light Sensor
• Manufacturer: MICROSEMI [Microsemi Corporation]

SMB
following are not production tested specifications, but are common SMBus protocol specifications practiced.
Copyright © 2010
Rev. 1.0, 2010-03-25
SMBus Clock
SMBus Data
US
V
V
(SDA)
V
V
(SCL)
The diagram below illustrates the various SMBus timings and sets the context for the specifications to follow. Note that the
IH
IH
IL
IL
C
OMMON
TM
P
t
Symbol
T
T
T
T
T
BUF
T
T
F
T
HD:DAT
T
HD:STA
SU:DAT
SU:STA
SU:STO
C
HIGH
T
T
SMB
LOW
BUF
POR
IN
F
R
AC S
S
t
HD:STA
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
PECIFICATIONS
SMBus Operating Frequency
Bus free time between Stop and Start Condition
Hold time after (Repeated) Start Condition. After this period, the
first clock is generated.
Repeated Start Condition setup time
Stop Condition setup time
Data hold time
Data setup time
Clock low period
Clock high period
Clock / Data Fall Time
Clock / Data Rise Time
Time in which a device must be operational after power-on reset
Capacitance for SCL or SDA pin
t
LOW
t
R
t
HD:DAT
Table 5: SMBus (I
Figure 4 – SMBus Timing Measurement
t
HIGH
Parameter
Analog Mixed Signal Group
t
F
®
Microsemi
t
SU:DAT
2
C compatible) Timing
t
SU:STA
SMBus Ambient Light Sensor
S
P
RODUCTION
MIN
FAST_MODE
100
1.3
0.6
0.6
0.6
1.3
0.6
10
0
-
-
D
ATASHEET
MAX
500
400
300
300
0.9
10
-
-
-
-
-
-
-
Units
kHz
ms
µs
µs
µs
µs
µs
µs
µs
pF
ns
ns
ns
LX1977
t
SU:STO
P
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