tsl2563 TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS, tsl2563 Datasheet - Page 9

• Manufacturer Part Number: tsl2563
• Description: Low-voltage Light-to-digital Converter
• Manufacturer: TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Analog-to-Digital Converter
Digital Interface
NOTE: The Slave and SMB Alert Addresses are 7 bits. Please note the SMBus and I
SMBus and I
The LUMENOLOGY r Company
The TSL256x 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.
Interface and control of the TSL256x is accomplished through a two-wire serial interface to a set of registers
that provide access to device control functions and output data. The serial interface is compatible with System
Management Bus (SMBus) versions 1.1 and 2.0, and I
addresses that are selectable via an external pin (ADDR SEL). The slave address options are shown in Table 1.
Each Send and Write protocol is, essentially, a series of bytes. A byte sent to the TSL256x with the most
significant bit (MSB) equal to 1 will be interpreted as a COMMAND byte. The lower four bits of the COMMAND
byte form the register select address (see Table 2), which is used to select the destination for the subsequent
byte(s) received. The TSL256x responds to any Receive Byte requests with the contents of the register
specified by the stored register select address.
The TSL256X implements the following protocols of the SMB 2.0 specification:
D
D
D
D
D
D
D
The TSL256X implements the following protocols of the Philips Semiconductor I
D
D
be appended to the slave address by the master device to properly communicate with the TSL256X device.
Send Byte Protocol
Receive Byte Protocol
Write Byte Protocol
Write Word Protocol
Read Word Protocol
Block Write Protocol
Block Read Protocol
I
I
2
2
C Write Protocol
C Read (Combined Format) Protocol
2
C Protocols
ADDR SEL TERMINAL LEVEL
GND
Float
VDD
Table 1. Slave Address Selection
PRINCIPLES OF OPERATION
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SLAVE ADDRESS
0101001
1001001
0111001
2
C bus Fast-Mode. The TSL256x offers three slave
2
C protocols on pages 9 through 12. A read/write bit should
LIGHT-TO-DIGITAL CONVERTER
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SMB ALERT ADDRESS
0001100
0001100
0001100
2
C specification:
TSL2562, TSL2563
Copyright E 2007, TAOS Inc.
LOW-VOLTAGE
TAOS066J − MAY 2007
9