diff --git a/components/TCA6408/tca6408.cpp b/components/TCA6408/tca6408.cpp
index 657f5f2..b240d68 100644
--- a/components/TCA6408/tca6408.cpp
+++ b/components/TCA6408/tca6408.cpp
@@ -12,11 +12,23 @@ static const uint8_t TCA6408_POLARITY_PORT = 0x02;
 static const uint8_t TCA6408_CONFIG_PORT   = 0x03;
 
 void TCA6408Component::setup() {
-  ESP_LOGCONFIG(TAG, "Setting up TCA6408...");
+  ESP_LOGCONFIG(TAG, "Setting up TCA6408 at address 0x%02X...", this->address_);
 
-  if (this->write_register(TCA6408_POLARITY_PORT, 0x00) != i2c::ERROR_OK ||
-      this->write_register(TCA6408_CONFIG_PORT, this->mode_mask_) != i2c::ERROR_OK ||
-      !this->read_gpio_outputs_()) {
+  // Initialize registers to known state
+  if (this->write_register(TCA6408_POLARITY_PORT, 0x00) != i2c::ERROR_OK) {
+    ESP_LOGE(TAG, "Failed to write polarity register");
+    this->mark_failed();
+    return;
+  }
+
+  if (this->write_register(TCA6408_CONFIG_PORT, this->mode_mask_) != i2c::ERROR_OK) {
+    ESP_LOGE(TAG, "Failed to write config register");
+    this->mark_failed();
+    return;
+  }
+
+  if (!this->read_gpio_outputs_()) {
+    ESP_LOGE(TAG, "Failed to read output register");
     this->mark_failed();
     return;
   }
@@ -24,13 +36,16 @@ void TCA6408Component::setup() {
   if (this->interrupt_pin_ != nullptr) {
     this->interrupt_pin_->setup();
     this->interrupt_pin_->pin_mode(gpio::FLAG_INPUT | gpio::FLAG_PULLUP);
-    this->interrupt_pin_->attach_interrupt(&TCA6408Component::gpio_intr, this, gpio::INTERRUPT_FALLING_EDGE);
+    this->interrupt_pin_->attach_interrupt(&TCA6408Component::gpio_intr, this,
+                                           gpio::INTERRUPT_FALLING_EDGE);
     this->set_invalidate_on_read_(false);
-    ESP_LOGCONFIG(TAG, "  Interrupt mode enabled");
+    ESP_LOGCONFIG(TAG, "  Interrupt mode enabled (active-low INT)");
   } else {
     this->enable_loop();
     ESP_LOGCONFIG(TAG, "  Polling mode enabled");
   }
+
+  ESP_LOGCONFIG(TAG, "  Setup complete");
 }
 
 void IRAM_ATTR TCA6408Component::gpio_intr(TCA6408Component *arg) {
@@ -42,9 +57,11 @@ void TCA6408Component::loop() {
   if (this->interrupt_triggered_) {
     this->interrupt_triggered_ = false;
 
-    this->digital_read_hw(0);
+    // Reading input port clears the interrupt on TCA6408
+    this->digital_read_hw(0);  // pin number is ignored, reads all 8 bits
     this->reset_pin_cache_();
 
+    // If INT line is high again, disable loop until next interrupt
     if (this->interrupt_pin_ && this->interrupt_pin_->digital_read()) {
       this->disable_loop();
     }
@@ -56,11 +73,13 @@ void TCA6408Component::dump_config() {
   LOG_I2C_DEVICE(this);
   ESP_LOGCONFIG(TAG, "  Address: 0x%02X", this->address_);
   LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
+  ESP_LOGCONFIG(TAG, "  Mode Mask: 0x%02X (1=input)", this->mode_mask_);
+  ESP_LOGCONFIG(TAG, "  Polarity Mask: 0x%02X", this->polarity_mask_);
 }
 
 bool TCA6408Component::read_gpio_outputs_() {
   if (this->is_failed()) return false;
-  uint8_t data;
+  uint8_t data = 0;
   if (this->read_register(TCA6408_OUTPUT_PORT, &data) != i2c::ERROR_OK) {
     this->status_set_warning();
     return false;
@@ -87,9 +106,9 @@ void TCA6408Component::digital_write_hw(uint8_t pin, bool value) {
   if (this->is_failed()) return;
 
   if (value) {
-    this->output_mask_ |= (1 << pin);
+    this->output_mask_ |= (1U << pin);
   } else {
-    this->output_mask_ &= ~(1 << pin);
+    this->output_mask_ &= ~(1U << pin);
   }
 
   if (this->write_register(TCA6408_OUTPUT_PORT, this->output_mask_) != i2c::ERROR_OK) {
@@ -101,9 +120,9 @@ void TCA6408Component::digital_write_hw(uint8_t pin, bool value) {
 
 void TCA6408Component::pin_mode(uint8_t pin, gpio::Flags flags) {
   if (flags & gpio::FLAG_OUTPUT) {
-    this->mode_mask_ &= ~(1 << pin);
+    this->mode_mask_ &= ~(1U << pin);  // 0 = output
   } else {
-    this->mode_mask_ |= (1 << pin);
+    this->mode_mask_ |= (1U << pin);   // 1 = input
     if (this->interrupt_pin_ == nullptr) {
       this->enable_loop();
     }
@@ -111,24 +130,25 @@ void TCA6408Component::pin_mode(uint8_t pin, gpio::Flags flags) {
   this->write_register(TCA6408_CONFIG_PORT, this->mode_mask_);
 }
 
+void TCA6408Component::set_polarity_inversion(uint8_t pin, bool inverted) {
+  if (inverted) {
+    this->polarity_mask_ |= (1U << pin);
+  } else {
+    this->polarity_mask_ &= ~(1U << pin);
+  }
+  this->write_register(TCA6408_POLARITY_PORT, this->polarity_mask_);
+}
+
 bool TCA6408Component::digital_read_cache(uint8_t pin) {
-  bool value = (this->input_mask_ & (1 << pin)) != 0;
-  if (this->polarity_mask_ & (1 << pin)) {
+  bool value = (this->input_mask_ & (1U << pin)) != 0;
+  // Apply hardware polarity inversion if set
+  if (this->polarity_mask_ & (1U << pin)) {
     value = !value;
   }
   return value;
 }
 
-void TCA6408Component::set_polarity_inversion(uint8_t pin, bool inverted) {
-  if (inverted) {
-    this->polarity_mask_ |= (1 << pin);
-  } else {
-    this->polarity_mask_ &= ~(1 << pin);
-  }
-  this->write_register(TCA6408_POLARITY_PORT, this->polarity_mask_);
-}
-
-// ==================== TCA6408GPIOPin ====================
+// ====================== TCA6408GPIOPin ======================
 
 void TCA6408GPIOPin::setup() {
   this->pin_mode(this->flags_);
@@ -150,15 +170,15 @@ void TCA6408GPIOPin::pin_mode(gpio::Flags flags) {
 }
 
 bool TCA6408GPIOPin::digital_read() {
-  return this->parent_->digital_read(this->pin_);
+  return this->parent_->digital_read(this->pin_) != this->inverted_;
 }
 
 void TCA6408GPIOPin::digital_write(bool value) {
-  this->parent_->digital_write(this->pin_, value);
+  this->parent_->digital_write(this->pin_, value != this->inverted_);
 }
 
 size_t TCA6408GPIOPin::dump_summary(char *buffer, size_t len) const {
-  return snprintf(buffer, len, "%u via TCA6408", this->pin_);
+  return snprintf(buffer, len, "%u via TCA6408@0x%02X", this->pin_, this->parent_->address_);
 }
 
 }  // namespace tca6408