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PDF PCA9672 Data sheet ( Hoja de datos )
| Número de pieza | PCA9672 | |
| Descripción | Remote 8-bit I/O expander | |
| Fabricantes | NXP Semiconductors | |
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PCA9672
Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt and
reset
Rev. 01 — 20 June 2006
Objective data sheet
1. General description
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The PCA9672 provides general purpose remote I/O expansion for most microcontroller
families via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plus
family.
The PCA9672 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus
(Fm+) I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWM
dimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devices
can be on the bus without the need for bus buffers, higher total package sink capacity
(200 mA versus 100 mA) that supports having all LEDs on at the same time and more
device addresses (16 versus 8) are available to allow many more devices on the bus
without address conflicts.
The difference between the PCA9672 and the PCF8574 is that the A2 address pin is
replaced by the RESET input on the PCA9672.
The device consists of an 8-bit quasi-bidirectional port and an I2C-bus interface. The
PCA9672 has low current consumption and include latched outputs with 25 mA high
current drive capability for directly driving LEDs.
The PCA9672 possesses an interrupt line (INT) that can be connected to the interrupt
logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can
inform the microcontroller if there is incoming data on its ports without having to
communicate via the I2C-bus.
The internal Power-On Reset (POR), hardware reset pin (RESET), or Software Reset
sequence initializes the I/Os as inputs.
2. Features
I 1 MHz I2C-bus interface
I Compliant with the I2C-bus Fast and Standard modes
I SDA with 30 mA sink capability for 4000 pF buses
I 2.3 V to 5.5 V operation with 5.5 V tolerant I/Os
I 8-bit remote I/O pins that default to inputs at power-up
I Latched outputs with 25 mA sink capability for directly driving LEDs
I Total package sink capability of 200 mA
I Active LOW open-drain interrupt output
I 16 programmable slave addresses using 2 address pins
I Readable device ID (manufacturer, device type, and revision)
1 page  
Philips Semiconductors
PCA9672
Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt and reset
www.DataSheet4U.com
Table 2.
Symbol
P7
INT
SCL
SDA
VDD
Pin description …continued
Pin
SO16, TSSOP16 HVQFN16
12 10
13 11
14 12
15 13
16 14
Description
quasi-bidirectional I/O 7
interrupt output (active LOW)
serial clock line
serial data line
supply voltage
[1] HVQFN package die supply ground is connected to both the VSS pin and the exposed center pad. The VSS
pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and
board-level performance, the exposed pad needs to be soldered to the board using a corresponding
thermal pad on the board, and for proper heat conduction through the board thermal vias need to be
incorporated in the PCB in the thermal pad region.
7. Functional description
Refer to Figure 1 “Block diagram of PCA9672”.
7.1 Device address
Following a START condition, the bus master must send the address of the slave it is
accessing and the operation it wants to perform (read or write). The address of the
PCA9672 is shown in Figure 6. Slave address pins AD1 and AD0 choose 1 of 16 slave
addresses. To conserve power, no internal pull-up resistors are incorporated on AD1 and
AD0. Address values depending on AD1 and AD0 can be found in Table 3 “PCA9672
address map”.
Remark: When using the PCA9672 reserved I2C-bus addresses must be used with
caution since they can interfere with:
• “reserved for future use” I2C-bus addresses (0000 011, 1111 101, 1111 110,
1111 111)
• slave devices that use the 10-bit addressing scheme (1111 0xx)
• High speed mode (Hs-mode) master code (0000 1xx)
slave address
A6 A5 A4 A3 A2 A1 A0 R/W
programmable
002aab636
Fig 6. PCA9672 address
The last bit of the first byte defines the operation to be performed. When set to logic 1 a
read is selected, while a logic 0 selects a write operation.
When AD1 and AD0 are held to VDD or VSS, the same address as the PCF8574 with A2
held to VSS is applied.
PCA9672_1
Objective data sheet
Rev. 01 — 20 June 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
5 of 27
5 Page 
Philips Semiconductors
PCA9672
Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt and reset
8.4 Power-on reset
When power is applied to VDD, an internal Power-On Reset (POR) holds the PCA9672 in
a reset condition until VDD has reached VPOR. At that point, the reset condition is released
and the PCA9672 registers and I2C-bus/SMBus state machine will initialize to their default
states. Thereafter VDD must be lowered below 0.2 V to reset the device.
8.5 Interrupt output (INT)
The PCA9672 provides an open-drain interrupt (INT) which can be fed to a corresponding
input of the microcontroller (see Figure 12, Figure 13, and Figure 14). This gives these
chips a kind of master function which can initiate an action elsewhere in the system.
www.DataSheet4U.com
An interrupt is generated by any rising or falling edge of the port inputs. After time tv(D) the
signal INT is valid.
The interrupt disappears when data on the port is changed to the original setting or data is
read from or written to the device which has generated the interrupt.
In the write mode, the interrupt may become deactivated (HIGH) on the rising edge of the
write to port pulse. On the falling edge of the write to port pulse the interrupt is definitely
deactivated (HIGH).
The interrupt is reset in the read mode on the rising edge of the read from port pulse.
During the resetting of the interrupt itself, any changes on the I/Os may not generate an
interrupt. After the interrupt is reset any change in I/Os will be detected and transmitted as
an INT.
VDD
MICROCOMPUTER
INT
device 1
PCA9672
INT
device 2
PCA9672
INT
Fig 14. Application of multiple PCA9672s with interrupt
device 8
PCA9672
INT
002aac328
8.6 RESET input
A reset can be accomplished by holding the RESET pin LOW for a minimum of tw(rst). The
PCA9672 registers and I2C-bus state machine will be held in their default state until the
RESET input is once again HIGH.
PCA9672_1
Objective data sheet
Rev. 01 — 20 June 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
11 of 27
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