TCA6416A Datasheet, PDF (4/32 Pages) Texas Instruments – LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6416A
SCPS194 – MAY 2009 ....................................................................................................................................................................................................... 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
TCA6416A.
Table 1. Voltage Translation
V_CCI (SDA AND SCL OF I²C MASTER)
(V)
V_CCP (P PORT)
(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
LOGIC DIAGRAM (POSITIVE LOGIC)
INT ¹
LP Filter
Interrupt
Logic
ADDR ²¹
22
SCL
23
SDA
Input
Filter
I²C Bus
Control
Shift
Register
16 Bits
I/O Port
P17–P10
P07–P00
V_CCI
2
V_CCP
24
RESET ³
GND ¹²
Power-On
Reset
Write Pulse
Read Pulse
A. All I/Os are set to inputs at reset.
B. Pin numbers shown are for the PW package.
4
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