PCA9674AD,512 NXP Semiconductors, PCA9674AD,512 Datasheet - Page 15

• Manufacturer Part Number: PCA9674AD,512
• Description: IC I/O EXPANDER I2C 8B 16SOIC
• Manufacturer: NXP Semiconductors

Specifications of PCA9674AD,512

• Interface: I²C
• Number Of I /o: 8
• Interrupt Output: Yes
• Frequency - Clock: 1MHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Includes: POR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935282741512; PCA9674AD; PCA9674AD

NXP Semiconductors
PCA9674_PCA9674A_5
Product data sheet
8.4 Power-on reset
8.5 Interrupt output (INT)
When power is applied to V
PCA9674/74A in a reset condition until V
condition is released and the PCA9674/74A registers and I
will initialize to their default states. Thereafter V
the device.
The PCA9674/74A provides an open-drain interrupt (INT) which can be fed to a
corresponding input of the microcontroller (see
gives these chips a kind of master function which can initiate an action elsewhere in the
system.
An interrupt is generated by any rising or falling edge of the port inputs. After time t
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.
Fig 15. Application of multiple PCA9674s with interrupt
MICROCOMPUTER
INT
Rev. 05 — 15 June 2009
DD
V
Remote 8-bit I/O expander for Fm+ I
DD
, an internal Power-On Reset (POR) holds the
PCA9674
device 1
INT
DD
has reached V
Figure
DD
PCA9674
device 2
must be lowered below 0.2 V to reset
INT
13,
Figure
POR
2
C-bus/SMBus state machine
PCA9674/74A
. At that point, the reset
14, and
2
C-bus with interrupt
© NXP B.V. 2009. All rights reserved.
Figure
PCA9674
device 8
002aac122
INT
15). This
v(D)
15 of 32
the