Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - I/O extensions POR I²C, SMBus 400 kHz WQFN 24

FEATURES

P17

P16

P15

P14

P13

24 22 21

20 19

SDA

SCL

7 9 10 11 128

P00

P01

P02

P03

P04

P05

P10

P11

P06

P07

P12

GND

INT

Exposed

Center

Pad

INT

P00

P01

P02

P03

P04

P05

P06

P07

GND

SDA

SCL

P17

P16

P15

P14

P13

P12

P11

P10

DESCRIPTION/ORDERING INFORMATION

TCA9555

www.ti.com

.............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009

LOW VOLTAGE 16-BIT I

C AND SMBus I/O EXPANDER

WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS

• Low Standby-Current Consumption of • Polarity Inversion Register

3 µ A Max

• Latched Outputs With High-Current Drive

• I

C to Parallel Port Expander Capability for Directly Driving LEDs

• Open-Drain Active-Low Interrupt Output • Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

• 5-V Tolerant I/O Ports

• ESD Protection Exceeds JESD 22

• Compatible With Most Microcontrollers

– 2000-V Human-Body Model (A114-A)

• 400-kHz Fast I

C Bus

– 200-V Machine Model (A115-A)

• Address by Three Hardware Address Pins for

Use of up to Eight Devices – 1000-V Charged-Device Model (C101)

PW PACKAGE RTW PACKAGE

(TOP VIEW) (TOP VIEW)

The exposed center pad, if used, must be

connected as a secondary ground or left

electrically open.

This 16-bit I/O expander for the two-line bidirectional bus (I

C) is designed for 1.65-V to 5.5-V V

operation. It

provides general-purpose remote I/O expansion for most microcontroller families via the I

C interface [serial clock

(SCL), serial data (SDA)].

The TCA9555 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity

Inversion (active high or active low operation) registers. At power on, the I/Os are configured as inputs. 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 TCA9555 in the event of a timeout or other improper operation by utilizing the

power-on reset feature, which puts the registers in their default state and initializes the I

C/SMBus state machine.

The TCA9555 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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (34 pages)

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TCA9555 www.ti.com ..............................................................................................................................................................
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com 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.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 TERMINAL FUNCTIONS NO. NAME DESCRIPTION TSSOP (PW) QFN (RTW) 1 22 INT Interrupt output. Connect to VCC through a pullup resistor. 2 23 A1 Address input 1. Connect directly to VCC or ground. 3 24 A2 Address input 2. Connect directly to VCC or ground.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com LOGIC DIAGRAM (POSITIVE LOGIC) TCA9555 INT A0 A1 A2 SCL SDA 1 Interrupt Logic LP Filter 21 2 P07-P00 3 22 23 Input Filter I2C Bus Control Shift Register 16 Bits I/O Port P17-P10 Write Pulse VCC GND 4 24 12 Read Pulse Power-On Reset A.
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TCA9555 www.ti.com ..............................................................................................................................................................
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com I2C Interface The bidirectional I2C bus consists of the serial clock (SCL) and serial data (SDA) lines. Both lines must be connected to a positive supply via a pullup resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus is not busy.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 Data Output by Transmitter NACK Data Output by Receiver ACK SCL From Master 1 2 8 9 S Clock Pulse for Acknowledgment Start Condition Figure 3.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com Device Address Figure 4 shows the address byte of the TCA9555. R/W Slave Address 0 1 0 0 A2 A1 A0 Fixed Programmable Figure 4.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 Register Descriptions The Input Port registers (registers 0 and 1) reflect the incoming logic levels of the pins, regardless of whether the pin is defined as an input or an output by the Configuration register. It only acts on read operation. Writes to these registers have no effect.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com Interrupt (INT) Output An interrupt is generated by any rising or falling edge of the port inputs in the input mode. After time, tiv, the signal INT is valid.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 Reads The bus master first must send the TCA9555 address with the least-significant bit set to a logic 0 (see Figure 4 for device address). The command byte is sent after the address and determines which register is accessed.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com 1 SCL 2 3 4 5 6 7 8 9 I0.x SDA S 0 1 0 0 A2 A1 A0 1 R/W A 00 Acknowledge From Slave I1.x A 10 I0.x A 03 Acknowledge From Master Acknowledge From Master I1.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) MIN MAX VCC Supply voltage range –0.5 6 V VI Input voltage range (2) –0.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com ELECTRICAL CHARACTERISTICS over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VCC MIN –1.2 VIK Input diode clamp voltage II = –18 mA 1.65 V to 5.5 V VPOR Power-on reset voltage VI = VCC or GND, IO = 0 1.65 V to 5.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 I2C INTERFACE TIMING REQUIREMENTS over recommended operating free-air temperature range (unless otherwise noted) (see Figure 11) fscl I2C clock frequency tsch I2C clock high time I C clock low time tsp I2C spike time tsds I2C serial-data setup time MAX UNIT 0 400 kHz µs 0.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com TYPICAL CHARACTERISTICS TA = 25°C (unless otherwise noted) SUPPLY CURRENT vs TEMPERATURE STANDBY SUPPLY CURRENT vs TEMPERATURE 55 70 30 SCL = V CC 50 V CC = 5 V ICC – Supply Current – nA 40 f SCL = 400 kHz I/Os Unloaded 35 30 25 V CC = 3.3 V 20 15 10 V CC = 2.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 TYPICAL CHARACTERISTICS (continued) TA = 25°C (unless otherwise noted) I/O SOURCE CURRENT vs OUTPUT HIGH VOLTAGE SUPPLY CURRENT vs NUMBER OF I/Os HELD LOW 300 V CC = 5 V V OH – Output High Voltage – mV TA = 25°C 35 30 25 20 15 TA = 125°C 10 5 0 0.0 0.1 0.2 0.3 0.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 PARAMETER MEASUREMENT INFORMATION (continued) VCC RL = 4.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com PARAMETER MEASUREMENT INFORMATION (continued) DUT Pn CL = 100 pF GND P-PORT LOAD CONFIGURATION 0.7 × VCC SCL P00 A P17 0.3 × VCC Slave ACK ÎÎÎ ÎÎÎ ÎÎÎ ÎÎÎ SDA Pn tpv (see Note A) Unstable Data Last Stable Bit WRITE MODE (R/W = 0) 0.7 × VCC SCL P00 A tps P17 0.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 PARAMETER MEASUREMENT INFORMATION (continued) VCC RL = 1 kΩ DUT SDA DUT CL = 100 pF CL = 50 pF SDA LOAD CONFIGURATION Pn P-PORT LOAD CONFIGURATION Start SCL ACK or Read Cycle SDA 0.3 y VCC tREC RESET VCC/2 tREC tw Pn VCC/2 tRESET A. CL includes probe and jig capacitance.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com APPLICATION INFORMATION Figure 15 shows an application in which the TCA9555 can be used. Subsystem 1 (e.g., Temperature Sensor) INT VCC (5 V) VCC 10 kΩ 10 kΩ 10 kΩ 24 Ω 10 kΩ 22 SCL Master Controller SDA 23 1 INT Subsystem 2 (e.g.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 Minimizing ICC When I/O Is Used to Control LED When an I/O is used to control an LED, normally it is connected to VCC through a resistor as shown in Figure 15. Because the LED acts as a diode, when the LED is off, the I/O VIN is about 1.2 V less than VCC.
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TCA9555 SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com VCC Ramp-Down Ramp-Up VCC_TRR_VPOR50 VIN drops below POR levels Time Time to Re-Ramp VCC_FT VCC_RT Figure 19. VCC is Lowered Below the POR Threshold, Then Ramped Back Up to VCC Table 1 specifies the performance of the power-on reset feature for TCA9555 for both types of power-on reset.
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TCA9555 www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009 VCC VPOR VPORF Time POR Time Figure 21.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TCA9555RTWR Package Package Pins Type Drawing WQFN RTW 24 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 3000 330.0 12.4 Pack Materials-Page 1 4.25 B0 (mm) K0 (mm) P1 (mm) 4.25 1.15 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TCA9555RTWR WQFN RTW 24 3000 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.