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TCA6424 Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce TCA6424
Description  LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TCA6424 Fiches technique(HTML) 3 Page - Texas Instruments

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TCA6424
www.ti.com
SCPS175A – NOVEMBER 2007 – REVISED NOVEMBER 2009
Table 1. TERMINAL FUNCTIONS (continued)
TERMINAL
DESCRIPTION
PIN NO.
NAME
22
P25
P-port input/output (push-pull design structure). At power on, P25 is configured as an input.
23
P26
P-port input/output (push-pull design structure). At power on, P26 is configured as an input.
24
P27
P-port input/output (push-pull design structure). At power on, P27 is configured as an input.
25
GND
Ground
26
ADDR
Address input. Connect directly to VCCP or ground.
27
VCCP
Supply voltage of TCA6424 for P port
28
RESET
Active-low reset input. Connect to VCCP through a pullup resistor, if no active connection is used.
29
SCL
Serial clock bus. Connect to VCCI through a pullup resistor.
30
SDA
Serial data bus. Connect to VCCI through a pullup resistor.
Supply voltage of I2C bus. Connect directly to the VCC of the external I
2C master. Provides voltage-level
31
VCCI
translation.
32
INT
Interrupt output. Connect to VCCI through a pullup resistor.
Voltage Translation
Table 2 shows how to set up VCC levels for the necessary voltage translation between the I
2C bus and the
TCA6424.
Table 2. Voltage Translation
VCCI (SDA AND SCL OF I
2C MASTER)
VCCP (P PORT)
(V)
(V)
1.8
1.8
1.8
2.5
1.8
3.3
1.8
5
2.5
1.8
2.5
2.5
2.5
3.3
2.5
5
3.3
1.8
3.3
2.5
3.3
3.3
3.3
5
5
1.8
5
2.5
5
3.3
5
5
Copyright © 2007–2009, Texas Instruments Incorporated
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