TSL2568, TSL2569
LIGHT-TO-DIGITAL CONVERTER
TAOS091D DECEMBER 2008
11
The LUMENOLOGY r Company
r
r
Copyright E 2008, TAOS Inc.
www.taosinc.com
Wr
8
Data Byte 1
Slave Address
S
1
A
A
8
1
1
1
Command Code
P
Data Byte N
A
8
1
1
Byte Count = N
A
A
...
7
8
1 1
Data Byte 2
A
8
1
...
Figure 14. SMBus Block Write or I
2
C Write Protocols
NOTE: The I
2
C write protocol does not use the Byte Count packet, and the Master will continue sending Data Bytes until the Master initiates a
Stop condition. See the Command Register on page 13 for additional information regarding the Block Read/Write protocol.
Wr
7
Byte Count = N
Slave Address
S
1
A
A
8
1
1
1
Command Code
P
Data Byte N
A
8
1
1
Slave Address
A
A
...
7
8
1 1
Data Byte 2
A
8
1
...
Data Byte 1
A
8
1
1
Sr
1
Rd
1
Figure 15. SMBus Block Read or I
2
C Read (Combined Format) Protocols
NOTE: The I
2
C read protocol does not use the Byte Count packet, and the Master will continue receiving Data Bytes until the Master initiates
a Stop Condition. See the Command Register on page 13 for additional information regarding the Block Read/Write protocol.
Register Set
The TSL256x is controlled and monitored by sixteen registers (three are reserved) and a command register
accessed through the serial interface. These registers provide for a variety of control functions and can be read
to determine results of the ADC conversions. The register set is summarized in Table 2.
Table 2. Register Address
ADDRESS
RESISTER NAME
REGISTER FUNCTION
COMMAND
Specifies register address
0h
CONTROL
Control of basic functions
1h
TIMING
Integration time/gain control
2h
THRESHLOWLOW
Low byte of low interrupt threshold
3h
THRESHLOWHIGH
High byte of low interrupt threshold
4h
THRESHHIGHLOW
Low byte of high interrupt threshold
5h
THRESHHIGHHIGH
High byte of high interrupt threshold
6h
INTERRUPT
Interrupt control
7h
Reserved
8h
CRC
Factory test not a user register
9h
Reserved
Ah
ID
Part number/ Rev ID
Bh
Reserved
Ch
DATA0LOW
Low byte of ADC channel 0
Dh
DATA0HIGH
High byte of ADC channel 0
Eh
DATA1LOW
Low byte of ADC channel 1
Fh
DATA1HIGH
High byte of ADC channel 1
The mechanics of accessing a specific register depends on the specific SMB protocol used. Refer to the section
on SMBus protocols. In general, the COMMAND register is written first to specify the specific control/status
register for following read/write operations.
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