TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
PARAMETER MEASUREMENT INFORMATION
SMBCLK
t(BUF)
SMBDATA
t(LOW)
t(R)
VIH
VIL
t(HDSTA)
t(HDDAT)
VIH
VIL
t(F)
t(HIGH) t(SUSTA)
t(SUDAT)
t(SUSTO)
P
S
S
P
Stop
Condition
Start
Condition
Start
Stop
t(LOWSEXT)
SMBCLKACK
SMBCLKACK
t(LOWMEXT)
t(LOWMEXT)
t(LOWMEXT)
SMBCLK
SMBDATA
Figure 1. SMBus Timing Diagrams
1
91
9
SMBCLK
SMBDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start by
Master
ACK by
TSL2550
Frame 1 SMBus Slave Address Byte
Frame 2 Command Byte
ACK by Stop by
TSL2550 Master
Figure 2. SMBus Timing Diagram for Send Byte Format
1
91
9
SMBCLK
SMBDATA
A6 A5 A4 A3 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start by
Master
ACK by
TSL2550
Frame 1 SMBus Slave Address Byte
NACK by Stop by
Master Master
Frame 2 Data Byte From TSL2550
Figure 3. SMBus Timing Diagram for Receive Byte Format
The LUMENOLOGY r Company
r
r
www.taosinc.com
Copyright E 2007, TAOS Inc.
5