PCA9535; PCA9535C
2
16-bit I C-bus and SMBus, low power I/O port with interrupt
Rev. 6 7 November 2017 Product data sheet
1. General description
The PCA9535 and PCA9535C are 24-pin CMOS devices that provide 16 bits of General
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Purpose parallel Input/Output (GPIO) expansion for I C-bus/SMBus applications and was
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developed to enhance the NXP Semiconductors family of I C-bus I/O expanders. The
improvements include higher drive capability, 5 V I/O tolerance, lower supply current,
individual I/O configuration, and smaller packaging. I/O expanders provide a simple
solution when additional I/O is needed for ACPI power switches, sensors, push buttons,
LEDs, fans, etc.
The PCA9535 and PCA9535C consist of two 8-bit Configuration (Input or Output
selection), Input, Output and Polarity Inversion (active HIGH or active LOW operation)
registers. The system master can enable the I/Os as either inputs or outputs by writing to
the I/O configuration bits. The data for each input or output is kept in the corresponding
Input or Output register. The polarity of the read register can be inverted with the Polarity
Inversion register. All registers can be read by the system master. Although pin-to-pin and
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I C-bus address compatible with the PCF8575, software changes are required due to the
enhancements and are discussed in Application Note AN469.
The PCA9535 is identical to the PCA9555 except for the removal of the internal I/O
pull-up resistor which greatly reduces power consumption when the I/Os are held LOW.
The PCA9535C is identical to the PCA9535 except that all the I/O pins are
high-impedance open-drain outputs.
The PCA9535 and PCA9535C open-drain interrupt output is activated when any input
state differs from its corresponding Input Port register state and is used to indicate to the
system master that an input state has changed. The power-on reset sets the registers to
their default values and initializes the device state machine.
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Three hardware pins (A0, A1, A2) vary the fixed I C-bus address and allow up to eight
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devices to share the same I C-bus/SMBus. The fixed I C-bus address of the PCA9535
and PCA9535C are the same as the PCA9555 allowing up to eight of these devices in any
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combination to share the same I C-bus/SMBus.
2. Features and benefits
Operating power supply voltage range of 2.3 V to 5.5 V
5 V tolerant I/Os
Polarity Inversion register
Active LOW interrupt output
Low standby current
Noise filter on SCL/SDA inputsPCA9535; PCA9535C
NXP Semiconductors
2
16-bit I C-bus and SMBus, low power I/O port with interrupt
No glitch on power-up
Internal power-on reset
16 I/O pins which default to 16 inputs
0 Hz to 400 kHz clock frequency
ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Offered in four different packages: SO24, TSSOP24, HVQFN24 and HWQFN24
3. Ordering information
Table 1. Ordering information
Type number Topside Package
marking
Name Description Version
PCA9535D PCA9535D SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
PCA9535PW PCA9535PW TSSOP24 plastic thin shrink small outline package; 24 leads; body SOT355-1
width 4.4 mm
PCA9535BS 9535 HVQFN24 plastic thermal enhanced very thin quad flat package; SOT616-1
no leads; 24 terminals; body 4 4 0.85 mm
PCA9535HF P35H HWQFN24 plastic thermal enhanced very very thin quad flat package; SOT994-1
no leads; 24 terminals; body 4 4 0.75 mm
PCA9535CD PCA9535CD SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
PCA9535CPW PCA9535C TSSOP24 plastic thin shrink small outline package; 24 leads; body SOT355-1
width 4.4 mm
PCA9535CHF P35C HWQFN24 plastic thermal enhanced very very thin quad flat package; SOT994-1
no leads; 24 terminals; body 4 4 0.75 mm
3.1 Ordering options
Table 2. Ordering options
Type number Orderable Package Packing method Minimum Temperature
part number order
quantity
PCA9535D PCA9535D,112 SO24 STANDARD MARKING * 1200 T = 40 C to +85 C
amb
IC'S TUBE - DSC BULK
PACK
PCA9535D,118 SO24 REEL 13" Q1/T1 1000 T = 40 C to +85 C
amb
*STANDARD MARK SMD
PCA9535PW PCA9535PW,112 TSSOP24 STANDARD MARKING * 1575 T = 40 C to +85 C
amb
IC'S TUBE - DSC BULK
PACK
PCA9535PW,118 TSSOP24 REEL 13" Q1/T1 2500 T = 40 C to +85 C
amb
*STANDARD MARK SMD
PCA9535BS PCA9535BS,118 HVQFN24 REEL 13" Q1/T1 6000 T = 40 C to +85 C
amb
*STANDARD MARK SMD
PCA9535_PCA9535C All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2017. All rights reserved.
Product data sheet Rev. 6 7 November 2017 2 of 34