PCA9538

Features:

• 8-bit I2C GPIO with interrupt and reset
• 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
• Active LOW reset input
• Low stand-by current
• Noise filter on SCL/SDA inputs
• No glitch on power-up
• Internal power-on reset
• 8 I/O pins which default to 8 inputs
• 0 kHz 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 JESDEC Standard JESD78 which exceeds 100 mA
• Offered in three different packages: SO16, TSSOP16, and HVQFN16


Pinout




Specifications

symbol	partameter	conditions	MIN	MAX	unit
VDD	Supply voltage		-0.5	6.0	V
VI	DC input current		-	5.5	V
Ii	DC voltage on an I/O		VSS- 0.5	±25	MA
IIHL(max)	Maximum allowed input current through protection diode (I/O1 - I/O7		-	±400	A
VI/O	DC voltage on an I/O as an input other than I/O0			5.5	V
II/OI/O0	DC voltage on I/O0 as an input		-	+55	°C
II/OI/O0	DC input current		-	-85	mA
IDD	DC output current on an I/O		-	100	mA
ISS	DC supply current		-	200	mA
Ptot	Total power dissipation		--65	+150	°C
Tstg	Storage temperature range		-40	+65	°C
Tamb	Operating ambient temperature		-	+125	°C

Description

The PCA9538 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for I2C/SMBus applications and was developed to enhance the Philips family of I2C I/O expanders. I/O expanders provides a simple solution when additional I/O is needed for ACPI power switches, sensors, pushbuttons, LEDs, fans, etc.

The PCA9538 consists of an 8-bit Configuration register (Input or Output selection); 8-bit Input register, 8-bit Output register and an 8-bit Polarity inversion register (Active HIGH or Active LOW operation). 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 input port register PCA9538 can be inverted with the Polarity Inversion Register. All registers can be read by the system master.

The PCA9538 is identical to the PCA9554 except for the removal of the internal I/O pull-up resistor which greatly reduces power consumption when the I/Os are held LOW, replacement of A2 with RESET and different address range.

The PCA9538 open-drain interrupt output is activated when any input state differs from its corresponding input port register of PCA9538 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. The RESET pin causes the same reset/initialization to occur without depowering the device.

Two hardware pins of PCA9538(A0 and A1) vary the fixed I²C address and allow up to four devices to share the same I²C/SMBus.