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TCA6408 Datasheet(PDF) 2 Page - Texas Instruments

Part No. TCA6408
Description  LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

TCA6408 Datasheet(HTML) 2 Page - Texas Instruments

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TCA6408
LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
QFN – RGT
Reel of 3000
TCA6408RGTR
ZWP
BGA – ZXY (Pb-free)
Reel of 2500
TCA6408ZXYR
PH408
–40
°C to 85°C
Tube of 70
TCA6408PW
TSSOP – PW
PH408
Reel of 2000
TCA6408PWR
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
The major benefit of this device is its wide VCC range. It can operate from 1.65-V to 5.5-V on the P port side and
on the SDA/SCL side. This allows the TCA6408 to interface with next-generation microprocessors and
microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to
the dropping power supplies of microprocessors and microcontrollers, some PCB components such as LEDs
remain at a 5-V power supply.
The bidirectional voltage level translation in the TCA6408 is provided through VCCI. VCCI should be connected to
the VCC of the external SCL/SDA lines. This indicates the VCC level of the I
2C bus to the TCA6408. The voltage
level on the P port of the TCA6408 is determined by VCCP.
The TCA6408 consists of one 8-bit configuration (input or output selection), input, output, and polarity inversion
(active high) register. At power on, the I/Os are configured as inputs. However, the system master can enable
the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is
kept in the corresponding input or output register. The polarity of the input port register can be inverted with the
polarity inversion register. All registers can be read by the system master.
The system master can reset the TCA6408 in the event of a timeout or other improper operation by asserting a
low in the RESET input. The power-on reset puts the registers in their default state and initializes the I2C/SMBus
state machine. The RESET pin causes the same reset/initialization to occur without depowering the part.
The TCA6408 open-drain interrupt (INT) output is activated when any input state differs from its corresponding
input port register state and is used to indicate to the system master that an input state has changed.
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the
remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via
the I2C bus. Thus, the TCA6408 can remain a simple slave device.
The device P port outputs have high-current sink capabilities for directly driving LEDs while consuming low
device current.
One hardware pin (ADDR) can be used to program and vary the fixed I2C address and allow up to two devices
to share the same I2C bus or SMBus.
2
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