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TCA9535RTWR
Remote 16-Bit I2C and SMBus, Low-Power I/O Expander With Interrupt Output and Config Registers
TCA9535
SDA2 C or SMBus Master
SCL
INT
VCC
P00
P01
P02
P03
P04
P05
P06
P07
Peripheral
Devices RESET, EN or
Control Inputs INT or status
outputs LEDs Keypad
P11
P12
P13
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TCA9535SCPS201D –AUGUST 2009–REVISED JULY 2016
TCA9535 Low-Voltage 16-BitI2C and SMBus Low-Power I/O Expander
with Interrupt Output and Configuration Registers FeaturesI2Cto Parallel Port Expander Wide Power Supply Voltage Rangeof 1.65VtoV Low Standby-Current Consumption Open-Drain Active-Low Interrupt Output 5-V Tolerant I/O Ports 400-kHz FastI2C Bus Polarity Inversion Register Addressby Three Hardware Address Pins for Useupto Eight Devices Latched Outputs With High-Current Drive
Capability for Directly Driving LEDs Latch-Up Performance Exceeds 100 mA Per
JESD 78, ClassII ESD Protection Exceeds JESD22 2000-V Human-Body Model (A114-A) 1000-V Charged-Device Model (C101)
Applications Servers Routers (Telecom Switching Equipment) Personal Computers Personal Electronics (For Example, Gaming
Consoles) Industrial Automation Products With GPIO-Limited Processors
DescriptionThe TCA9535isa 24-pin device that provides16 bits general purpose parallel input and output (I/O)
expansion for the two-line bidirectionalI2C bus or
(SMBus) protocol. The device can operate witha
power supply voltage ranging from 1.65Vto 5.5V.
The TCA9535 consists of two 8-bit Configuration
(inputor 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 inputsor outputs by writingto the
I/O configuration bits.
The TCA9535is identicalto the TCA9555, except
that the TCA9535 does not include the internal I/O
pull-up resistor, which requires pull-ups and pull-
downs on unused I/O pins when configured as an
input and undriven.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Block Diagram
