PCA9703PW,112 NXP Semiconductors, PCA9703PW,112 Datasheet - Page 8

• Manufacturer Part Number: PCA9703PW,112
• Description: IC SPI GPI 16-BIT 24TSSOP
• Manufacturer: NXP Semiconductors

Specifications of PCA9703PW,112

• Rohs Status: RoHS Compliant
• Applications: Automotive
• Interface: SPI Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Package / Case: 24-TSSOP
• Mounting Type: Surface Mount
• Other names: 568-5052-5

NXP Semiconductors
PCA9703_1
Product data sheet
7.3 Interrupt enable
7.4 General Purpose Inputs
Table 3
input status register. The interrupt output is asserted when the input port and input status
register differ.
Table 3.
H = HIGH; L = LOW; X = don’t care
[1]
[2]
INT_EN is the interrupt output enable input and the general purpose input enable input. It
is an active HIGH input. When the INT_EN pin is LOW the GPI pins are turned off to
minimize power loss when the input pull-ups are cycled and the INT output is disabled.
The cycled pull-up should be active sufficiently long before the INT_EN is taken active that
the GPI pin voltage is completely settled to prevent false or transient interrupt signals.
The General Purpose Inputs (GPI) are designed to behave like a typical input in the 0 V to
5.5 V range, but are also designed to have low leakage currents at elevated voltages. The
input structure allows for elevated voltages to be applied through a series resistor. The
series resistor is required when the input voltage is above 5.5 V. The series resistor is
required for two reasons: first, to prevent damage to the input avalanche diode, and
second, to prevent the ESD protection circuitry from creating an excessive current flow.
The ESD protection circuitry includes a latch-back style device, which provides excellent
ESD protection during assembly or typical 5.5 V applications. The series resistor limits the
current flowing into the part and provides additional ESD protection. The limited current
prevents the ESD latch-back device from latching back to a low voltage, which would
cause excessive current flow and damage the part when the input voltage is above 5.5 V.
The minimum required series resistance for applications with input voltages above 5.5 V
is 100 kΩ. For applications requiring an applied voltage above 27 V,
recommended to determine the series resistor. Failure to include the appropriate input
series resistor may result in product failure and will void the warranty.
The series resistor should be place physically as close as possible to the connected input
to reduce the effective node capacitance. The input response time is effected by the RC
time constant of the series resistor and the input node capacitance.
R
INT_EN
H
H
H
H
L
s
=
Input status register is the value or content of the D flip-flops.
Logic states shown for INT pin assumes 10 kΩ pull-up resistor.
voltage applied 17 V
----------------------------------------------------------- -
illustrates the state of the interrupt output versus the state of the input port and
Input port status
L
L
H
H
X
Interrupt output function truth table
I
I
Rev. 01 — 23 February 2010
–
Input status register
L
H
L
H
X
18 V tolerant SPI 16-bit GPI with maskable INT
[1]
INT output
Mask bit = 1
(unmasked)
H
L
L
H
H
[2]
Equation 1
PCA9703
© NXP B.V. 2010. All rights reserved.
Mask bit = 0
(masked)
H
H
H
H
H
is
8 of 27
(1)