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| TCA7408 Datasheet, PDF (3/25 Pages) Texas Instruments – Low-Voltage 8-Bit I2C and SMBus I/O Expander with Interrupt Output, RESET, I/ODirection Registers, and Programmable Pull-up/Pull-down | |||
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www.ti.com
DEVICE INFORMATION
TCA7408
SCPS235 â NOVEMBER 2011
TOP THROUGH VIEW
1
2
3
4
A
GND
GPIO7
GPIO6
GPIO5
B
VCCI
VCCP
ADDR
GPIO4
C
SDA
INT
RESET
GPIO3
D
SCL
GPIO0
GPIO1
GPIO2
µCSP (ZSZ)
PIN NO. NAME
B1 VCCI
B3 ADDR
C3 RESET
D2 GPIO0
D3 GPIO1
D4 GPIO2
C4 GPIO3
A1 GND
B4 GPIO4
A4 GPIO5
A3 GPIO6
A2 GPIO7
C2 INT
D1 SCL
C1 SDA
B2 VCCP
PIN FUNCTIONS
DESCRIPTION
Supply voltage of I2C bus. Connect directly to the VCCI of the external I2C master. Provides voltage level
translation.
Address input. Connect directly to VCCI or ground.
Active-low reset input. Connect to VCCI through a pull-up resistor, if no active connection is used.
GPIO-port input/output (push-pull design structure). At power on, GPIO0 is configured as an input.
GPIO-port input/output (push-pull design structure). At power on, GPIO1 is configured as an input.
GPIO-port input/output (push-pull design structure). At power on, GPIO2 is configured as an input.
GPIO-port input/output (push-pull design structure). At power on, GPIO3 is configured as an input.
Ground
GPIO-port input/output (push-pull design structure). At power on, GPIO4 is configured as an input.
GPIO-port input/output (push-pull design structure). At power on, GPIO5 is configured as an input.
GPIO-port input/output (push-pull design structure). At power on, GPIO6 is configured as an input.
GPIO-port input/output (push-pull design structure). At power on, GPIO7 is configured as an input.
Active-low interrupt output. Connect to VCCI through a pull-up resistor.
Serial clock bus. Connect to VCCI through a pull-up resistor.
Serial data bus. Connect to VCCI through a pull-up resistor.
Supply voltage of TCA7408 for GPIO-port
VOLTAGE TRANSLATION
VCCI
(SCL AND SDA OF I2C MASTER)
(V)
VCCP
(GPIO-PORT)
(V)
1.8
1.8
1.8
2.5
1.8
3.3
2.5
1.8
2.5
2.5
2.5
3.3
3.3
1.8
3.3
2.5
3.3
3.3
5
1.8
5
2.5
5
3.3
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s) :TCA7408
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