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TCA6416A Fiches technique(PDF) 2 Page - Texas Instruments |
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TCA6416A Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 34 page TCA6416A SCPS194A – MAY 2009 – REVISED NOVEMBER 2009 www.ti.com DESCRIPTION/ORDERING INFORMATION This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL) and serial data (SDA)]. 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 TCA6416AA 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 TCA6416A 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 TCA6416A. The voltage level on the P-port of the TCA6416A is determined by the VCCP. The TCA6416A consists of two 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high) registers. 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 TCA6416A 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 TCA6416A 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 TCA6416A 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. ORDERING INFORMATION TA PACKAGE(1) (2) ORDERABLE PART NUMBER TOP-SIDE MARKING BGA – ZQS (Pb-free) Reel of 2500 TCA6416AZQSR PH416 –40°C to 85°C QFN – RTW Reel of 3000 TCA6416ARTWR PH416 TSSOP – PW Reel of 2000 TCA6416APWR PH416 (1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. (2) 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. Table 1. ZQS Package Terminal Assignments E P13 P11 P10 GND P06 D P15 P14 P12 P07 P05 C P16 P17 P01 P04 P03 B ADDR VCCP VCCI NB P02 A SCL SDA INT RESET P00 5 4 3 2 1 2 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TCA6416A |
Numéro de pièce similaire - TCA6416A_11 |
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Description similaire - TCA6416A_11 |
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