TSL2581, TSL2583

LIGHT-TO-DIGITAL CONVERTER

TAOS134A − JULY 2012

7

The LUMENOLOGY

r Company

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r

Copyright

E 2012, TAOS Inc.

www.taosinc.com

PRINCIPLES OF OPERATION

Analog-to-Digital Converter

The TSL258x contains two integrating analog-to-digital converters (ADC) that integrate the currents from the

channel 0 and channel 1 photodiodes. Integration of both channels occurs simultaneously, and upon completion

of the conversion cycle the conversion result is transferred to the channel 0 and channel 1 data registers,

respectively. The transfers are double buffered to ensure that invalid data is not read during the transfer. After

the transfer, the device automatically begins the next integration cycle.

Digital Interface

Interface and control of the TSL258x is accomplished through a two-wire serial interface to a set of registers

Fast-Mode. The TSL258x offers three slave addresses that are selectable via an external pin (ADDR SEL). The

slave address options are shown in Table 1.

Table 1. Slave Address Selection

ADDR SEL TERMINAL LEVEL

SLAVE ADDRESS

GND

0101001

Float

0111001

1001001

NOTE: A read/write bit should be appended to the slave address by the master device to properly communicate with the TSL258x device.