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TCA6416PWT Datasheet(PDF) 9 Page - Texas Instruments

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Part # TCA6416PWT
Description  LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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Register Descriptions
Power-On Reset
TCA6416
www.ti.com ........................................................................................................................................ SCPS153A – DECEMBER 2007 – REVISED FEBRUARY 2009
The Input Port registers (registers 0 and 1) reflect the incoming logic levels of the pins, regardless of whether the
pin is defined as an input or an output by the Configuration register. They act only on read operation. Writes to
these registers have no effect. The default value (X) is determined by the externally applied logic level. Before a
read operation, a write transmission is sent with the command byte to indicate to the I2C device that the Input
Port register will be accessed next.
Registers 0 and 1 (Input Port Registers)
BIT
I-07
I-06
I-05
I-04
I-03
I-02
I-01
I-00
DEFAULT
X
X
X
X
X
X
X
X
BIT
I-17
I-16
I-15
I-14
I-13
I-12
I-11
I-10
DEFAULT
X
X
X
X
X
X
X
X
The Output Port registers (registers 2 and 3) shows\ the outgoing logic levels of the pins defined as outputs by
the Configuration register. Bit values in these registers have no effect on pins defined as inputs. In turn, reads
from these registers reflect the value that is in the flip-flop controlling the output selection, NOT the actual pin
value.
Registers 2 and 3 (Output Port Registers)
BIT
O-07
O-06
O-05
O-04
O-03
O-02
O-01
O-00
DEFAULT
1
1
1
1
1
1
1
1
BIT
O-17
O-16
O-15
O-14
O-13
O-12
O-11
O-10
DEFAULT
1
1
1
1
1
1
1
1
The Polarity Inversion registers (register 4 and 5) allow polarity inversion of pins defined as inputs by the
Configuration register. If a bit in these registers is set (written with 1), the corresponding port pin's polarity is
inverted. If a bit in these registers is cleared (written with a 0), the corresponding port pin's original polarity is
retained.
Registers 4 and 5 (Polarity Inversion Registers)
BIT
P-07
P-06
P-05
P-04
P-03
P-02
P-01
P-00
DEFAULT
0
0
0
0
0
0
0
0
BIT
P-17
P-16
P-15
P-14
P-13
P-12
P-11
P-10
DEFAULT
0
0
0
0
0
0
0
0
The Configuration registers (registers 6 and 7) configure the direction of the I/O pins. If a bit in these registers is
set to 1, the corresponding port pin is enabled as an input with a high-impedance output driver. If a bit in these
registers is cleared to 0, the corresponding port pin is enabled as an output.
Registers 6 and 7 (Configuration Registers)
BIT
C-07
C-06
C-05
C-04
C-03
C-02
C-01
C-00
DEFAULT
1
1
1
1
1
1
1
1
BIT
C-17
C-16
C-15
C-14
C-13
C-12
C-11
C-10
DEFAULT
1
1
1
1
1
1
1
1
When power (from 0 V) is applied to VCCP, an internal power-on reset holds the TCA6416 in a reset condition
until VCCP has reached VPOR. At that time, the reset condition is released, and the TCA6416 registers and
I2C/SMBus state machine initializes to their default states. After that, VCCP must be lowered to below 0.2 V and
back up to the operating voltage for a power-reset cycle.
Copyright © 2007–2009, Texas Instruments Incorporated
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