TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
PARAMETER MEASUREMENT INFORMATION
t(LOW)
t(R)
t(F)
SMBCLK
VIH
VIL
t(HDSTA)
t(HIGH) t(SUSTA)
t(BUF)
SMBDATA
t(HDDAT)
VIH
VIL
t(SUDAT)
lid P
Stop
va Condition
S
Start
Condition
S
Start
Stop
t(LOWSEXT)
SMBCLKACK
SMBCLKACK
t(LOWMEXT)
t(LOWMEXT)
t(LOWMEXT)
SMBCLK
ill SMBDATA
t Figure 1. SMBus Timing Diagrams
AG t s 1
s n SMBCLK
91
t(SUSTO)
P
9
m te SMBDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
a n Start by
o Master
ACK by
TSL2550
Frame 1 SMBus Slave Address Byte
Frame 2 Command Byte
ACK by Stop by
TSL2550 Master
c Figure 2. SMBus Timing Diagram for Send Byte Format
l 1
91
9
a SMBCLK
nic SMBDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
h Start by
c Master
ACK by
TSL2550
Frame 1 SMBus Slave Address Byte
NACK by Stop by
Master Master
Frame 2 Data Byte From TSL2550
Te Figure 3. SMBus Timing Diagram for Receive Byte Format
The LUMENOLOGY r Company
r
r
www.taosinc.com
Copyright E 2007, TAOS Inc.
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