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PCA9502BS Datasheet(PDF) 4 Page - NXP Semiconductors

Part # PCA9502BS
Description  8-bit I/O expander with I2C-bus/SPI interface
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9502BS Datasheet(HTML) 4 Page - NXP Semiconductors

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PCA9502_3
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 03 — 13 October 2006
4 of 25
NXP Semiconductors
PCA9502
8-bit I/O expander with I2C-bus/SPI interface
[1]
See Section 7.1 “Hardware reset, Power-On Reset (POR) and software reset”
7.
Functional description
The device interfaces to a host through either I2C-bus or SPI interface (selectable through
I2C/SPI pin), and provides the host with eight programmable GPIO pins.
7.1 Hardware reset, Power-On Reset (POR) and software reset
These three reset methods are identical and will reset the internal registers as indicated in
Table 3.
Table 3 summarizes the state of registers after reset.
Table 4 summarizes the state of hardware pins after reset.
IRQ
12
O
Interrupt (open-drain, active LOW). Interrupt is enabled when
interrupt sources are enabled in the I/O Interrupt Enable register
(IOIntEna). The interrupt condition is the change of state of the
input pins. An external resistor (1 k
Ω for 3.3 V, 1.5 kΩ for 2.5 V)
must be connected between this pin and VDD.
GPIO0
13
I/O
programmable I/O pin
GPIO1
14
I/O
programmable I/O pin
GPIO2
15
I/O
programmable I/O pin
GPIO3
16
I/O
programmable I/O pin
GPIO4
18
I/O
programmable I/O pin
GPIO5
19
I/O
programmable I/O pin
GPIO6
20
I/O
programmable I/O pin
GPIO7
21
I/O
programmable I/O pin
VSS
10, 17,
23
-
ground
VSS
center
pad
-
The center pad on the back side of the HVQFN24 package is
metallic and should be connected to ground on the printed-circuit
board.
Table 2.
Pin description …continued
Symbol
Pin
Type
Description
Table 3.
Registers after reset
Register
Reset state
I/O direction
all bits cleared
I/O interrupt enable
all bits cleared
I/O control
all bits cleared
Table 4.
Signals after reset
Signal
Reset state
I/Os
inputs
IRQ
HIGH by external pull-up


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