TCA6408_09 Datasheet, PDF (4/31 Pages) Texas Instruments – LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6408
LOW-VOLTAGE 8-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007
www.ti.com
Voltage Translation
Table 1 shows how to set up V_CC levels for the necessary voltage translation between the I²C bus and the
TCA6408.
Table 1. Voltage Translation
V_CCI
(SCL and SDA of I²C master)
(V)
1.8
1.8
1.8
1.8
2.5
2.5
2.5
2.5
3.3
3.3
3.3
3.3
5
5
5
5
V_CCP
(P Port)
(V)
1.8
2.5
3.3
5
1.8
2.5
3.3
5
1.8
2.5
3.3
5
1.8
2.5
3.3
5
4
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