SDAA267 January   2026 TCA9539-Q1 , TCA9539A-Q1

1.   1
2.   Abstract
3.   Trademarks
4. 1Introduction to TCA9539A-Q1 I2C GPIO expander
5. 2Key Specification Comparison: TCA9539A-Q1 vs TCA9539-Q1
   1. 2.1 I2C Addressing Scheme and Compatibility
   2. 2.2 Multidevice and Zonal Architectures
6. 3Why Use Interrupts with I2C GPIO Expanders?
7. 4Application Examples Using TCA9539A-Q1
   1. 4.1 Zonal Controller
   2. 4.2 Infotainment and ADAS Peripheral Control
   3. 4.3 Automotive Body Control Module (BCM)
   4. 4.4 Audio and Peripheral Monitoring
8. 5Summary
9. 6References