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Description
NXP PCA9555PW,112 I/O Expander, 16bit, 400 kHz, I2C, SMBus, 2.3 V, 5.5 V, TSSOPThe PCA9555PW,112 is a 24 pin CMOS Device that provides 16 bits of general purpose parallel input output (GPIO) expansion for IC bus SMBus applications and was developed to enhance the NXP semiconductors family of IC bus I O expanders. The improvements include higher drive capability, 5V I O tolerance, lower supply current and individual I O configuration. I O expanders provide a simple solution when additional I O is needed for ACPI power switches,
The PCA9555PW,112 is a 24-pin CMOS Device that provides 16 bits of general purpose parallel input/output (GPIO) expansion for I�C-bus/SMBus applications and was developed to enhance the NXP semiconductors family of I�C-bus I/O expanders. The improvements include higher drive capability, 5V I/O tolerance, lower supply current and individual I/O configuration. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, push buttons, LEDs and fans. The PCA9555 consists 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.
- 5V Tolerant I/Os
- Polarity inversion register
- Active low interrupt output
- Low standby current
- Noise filter on SCL/SDA inputs
- No glitch on power-up
- Internal power-on reset
- Latch-up testing is done to JEDEC standard JESD78 that exceeds 100mA
Applications
Industrial, Power Management, Sensing & Instrumentation
Warnings
ESD sensitive device, take proper precaution while handling the device.
Product details
| No. of I/O's | 16I/O's |
| Chip Configuration | 16bit |
| Bus Frequency | 400kHz |
| No. of Pins | 24Pins |
| Product Range | - |
| Automotive Qualification Standard | - |
| Interface Case Style | TSSOP |
| Supply Voltage Min | 2.3V |
| IC Interface Type | I2C, SMBus |
| Packaging | Each |
| Supply Voltage Max | 5.5V |
| MSL | MSL 1 - Unlimited |
Other details
| Brand | NXP |
| Part Number | PCA9555PW,112 |
| Quantity | Each |
| Technical Data Sheet EN |
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. Image is for illustrative purposes only. Please refer to product description.
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Exchange/Return Notes
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4.2 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 4
Super cute and soft!
Color: Pine Green, Color: Pine Green
I really like this case. I was surprised by how soft it is! It arrived in perfect condition (just like the photos), no smell, keyboard worked. I followed the sellers instructions to charge before use. I gave it one less star because personally don’t care about the keyboard, it’s a little on the slower side when using the mousepad or typing. I didn’t have any issues with connecting. It was an easy setup. I’d suggest you spend the money for a laptop or a true keyboard if you need it. This is more for looks. If it wasn’t for the quality of the case, I’d probably return.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 15, 2025
★★★★★ 5
Good protection for my ipad
Color: Sky Blue
Flap to close is magnetic, so it stays closed. Has a spot for the open for the ipad. Keyboard is a handy feature to have, and love that it lights up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 11, 2026
★★★★★ 3
Case quality is great, but keyboard is disappointing
Color: Mulberry
The quality of the case is really great. Plum color is beautiful. However, the keyboard is not the best quality. The keys are not sensitive enough and you can easily misspell words if you don’t click a key hard enough. The trackpad shortcuts are cool but inconvenient since you can turn off the shortcuts. You can turn off the trackpad but that just doesn’t work for me.
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Reviewed in the United States on May 16, 2026
★★★★★ 5
Economically priced ipad case
Color: Mulberry
There's absolutely no way you could find a better ipad case with a wireless keyboard for this price. My daughter loves it. I was expecting it to feel a little cheap because of the price. I was wrong, this is a great find... thanks
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
★★★★★ 2
Cute but beware of buttons with a mind of its own.
Color: Pink, Color: Pink
Super cute. Only has 3 keyboard multicolor options and one white light setting. Dimmable. But its functionality needs work. But the keys keep doing weird things like skipping lines, changing excel sheet formatting and just moving where I am typing on it own. Like it will be typing and then move to the beginning of the sentence and keep moving. The feel is super light and the quality of the case is great though. It’s easy to use and install to device with Bluetooth. Value is you get what you paid for. This keyboard is cute but not working quite well. I accidentally ordered a different model for a later iPad and had to return it, but based off of a leader model in comparison to this one, the keyboard just isn’t that great
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Reviewed in the United States on December 29, 2025
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