TSL2580, TSL2581

LIGHT-TO-DIGITAL CONVERTER

TAOS098 − MARCH 2010

17

The LUMENOLOGY

r Company

r

r

Copyright

E 2010, TAOS Inc.

www.taosinc.com

ID Register (12h)

The ID register provides the value for both the part number and silicon revision number for that part number.

It is a read-only register whose value never changes.

Table 11. ID Register

6

75

4

REVNO

2

31

0

PARTNO

Address

12h

Reset

− −

Bit :

FIELD

BITS

DESCRIPTION

PARTNO

7:4

Part Number Identification: field value 1000b = TSL2580, field value 1001b = TSL2581

REVNO

3:0

Revision number identification

Constant (13h)

The CONSTANT register provides a means to facilitate SMBus block transfers that is used as the Byte Count

in the SMBus protocol. For example, all four ADC Channel Data Registers can be read in a single SMBus block

transfer if an SMBus Block Read is initiate at address 13h. This register defaults to the constant 4, but may be

set to other values depending upon the end application. For example, if manual integration is employed and

the register is set to 5, then all four ADC Channel Data Registers and the Manual Integration Timer Register

can be read in a single SMBus read block transaction.

Table 12. Constant Register

6

75

4

2

31

0

CONSTANT

Address

12h

Reset

− −

Bit :

FIELD

BITS

DESCRIPTION

CONSTANT

7:0

the byte count field in the block transaction, so this register should be ignored if an TSL2581 device is used.