diff --git a/libraries/PCA9635/CHANGELOG.md b/libraries/PCA9635/CHANGELOG.md
index ec3d985b..69d18874 100644
--- a/libraries/PCA9635/CHANGELOG.md
+++ b/libraries/PCA9635/CHANGELOG.md
@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.4.4] - 2023-01-23
+- fix #22 update documentation
+- add **I2C_SoftwareReset()** experimental
+
+
 ## [0.4.3] - 2023-01-23
 - update GitHub actions
 - update license 2023
@@ -16,7 +21,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - update readme.md
 - minor edits
 
-
 ## [0.4.2] - 2022-11-19
 - add RP2040 in build-CI
 - add changelog.md
diff --git a/libraries/PCA9635/PCA9635.cpp b/libraries/PCA9635/PCA9635.cpp
index 1d9b1185..dc60967d 100644
--- a/libraries/PCA9635/PCA9635.cpp
+++ b/libraries/PCA9635/PCA9635.cpp
@@ -2,7 +2,7 @@
 //    FILE: PCA9635.cpp
 //  AUTHOR: Rob Tillaart
 //    DATE: 23-apr-2016
-// VERSION: 0.4.3
+// VERSION: 0.4.4
 // PURPOSE: Arduino library for PCA9635 I2C LED driver
 //     URL: https://github.com/RobTillaart/PCA9635
 
@@ -155,12 +155,12 @@ uint8_t PCA9635::setLedDriverMode(uint8_t channel, uint8_t mode)
   if (channel >= _channelCount)
   {
     _error  = PCA9635_ERR_CHAN;
-    return PCA9635_ERROR;
+    return _error;
   }
   if (mode > 3)
   {
     _error  = PCA9635_ERR_MODE;
-    return PCA9635_ERROR;
+    return _error;
   }
 
   uint8_t reg = PCA9635_LEDOUT_BASE + (channel >> 2);
@@ -181,7 +181,7 @@ uint8_t PCA9635::getLedDriverMode(uint8_t channel)
   if (channel >= _channelCount)
   {
     _error  = PCA9635_ERR_CHAN;
-    return PCA9635_ERROR;
+    return _error;
   }
 
   uint8_t reg = PCA9635_LEDOUT_BASE + (channel >> 2);
@@ -198,7 +198,7 @@ uint8_t PCA9635::getLedDriverMode(uint8_t channel)
 int PCA9635::lastError()
 {
   int e = _error;
-  _error = 0;
+  _error = PCA9635_OK;
   return e;
 }
 
@@ -367,6 +367,31 @@ uint8_t PCA9635::getOutputEnable()
 }
 
 
+//////////////////////////////////////////////////////
+//
+//  EXPERIMENTAL
+//
+int PCA9635::I2C_SoftwareReset(uint8_t method)
+{
+  //  only support 0 and 1
+  if (method > 1) return -999;
+  if (method == 1)
+  {
+    //  from https://github.com/RobTillaart/PCA9634/issues/10#issuecomment-1206326417
+   const uint8_t SW_RESET = 0x03;
+   _wire->beginTransmission(SW_RESET);
+   _wire->write(0xA5);
+   _wire->write(0x5A);
+   return _wire->endTransmission(true);
+  }
+
+  //  default - based upon NXP specification - UM10204.pdf - page 16
+  _wire->beginTransmission(0x00);
+  _wire->write(0x06);
+  return _wire->endTransmission(true);
+}
+
+
 /////////////////////////////////////////////////////
 //
 //  PRIVATE
diff --git a/libraries/PCA9635/PCA9635.h b/libraries/PCA9635/PCA9635.h
index 61fd44aa..a754fdcd 100644
--- a/libraries/PCA9635/PCA9635.h
+++ b/libraries/PCA9635/PCA9635.h
@@ -3,7 +3,7 @@
 //    FILE: PCA9635.h
 //  AUTHOR: Rob Tillaart
 //    DATE: 23-apr-2016
-// VERSION: 0.4.3
+// VERSION: 0.4.4
 // PURPOSE: Arduino library for PCA9635 I2C LED driver, 16 channel
 //     URL: https://github.com/RobTillaart/PCA9635
 
@@ -12,7 +12,7 @@
 #include "Wire.h"
 
 
-#define PCA9635_LIB_VERSION         (F("0.4.3"))
+#define PCA9635_LIB_VERSION         (F("0.4.4"))
 
 #define PCA9635_MODE1               0x00
 #define PCA9635_MODE2               0x01
@@ -156,6 +156,10 @@ public:
   uint8_t  getOutputEnable();
 
 
+  //  EXPERIMENTAL 0.4.4
+  int I2C_SoftwareReset(uint8_t method);
+
+
 private:
   //  DIRECT CONTROL
   uint8_t  writeReg(uint8_t reg, uint8_t value);  //  returns error status.
diff --git a/libraries/PCA9635/README.md b/libraries/PCA9635/README.md
index ae8d6769..6c034f9d 100644
--- a/libraries/PCA9635/README.md
+++ b/libraries/PCA9635/README.md
@@ -198,24 +198,52 @@ The functions to enable all/sub-addresses are straightforward:
 #### OutputEnable
 
 Since 0.4.3 (experimental) support to control the OE (Output Enable) pin of the PCA9635.
-This OE pin can control all LEDs simultaneously. It also allows to 
-control multiple PCA9635.
-Think of simultaneous switching ON/OFF of get dimming with a high frequency PWM.
+This OE pin can control all LEDs simultaneously. 
+It also allows to control multiple PCA9634 modules by connecting the OE pins.
+Think of simultaneous switching ON/OFF or get dimming with a high frequency PWM.
+Or use 2 modules alternatively by placing an inverter in between.
 
 See datasheet for the details
 
 - **bool setOutputEnablePin(uint8_t pin = 255)** sets the IO pin to connect to the OE pin of the PCA9635.
 A value of 255 indicates no pin set/selected.
-Sets the OE pin to LOW.
+Sets the OE pin to HIGH.
 Returns true on success.
 - **bool setOutputEnable(uint8_t value)** Sets the OE pin HIGH or LOW.
-All non zero values are HIGH.
+All non zero values are LOW.
 Returns true on success.
 - **uint8_t getOutputEnable()** get the current value of the OE pin.
-If pin is not set/selected it will return LOW.
+If pin is not set/selected it will return HIGH.
 
-Note: the OE is LOW active. The user has to set the power on value 
-by means of a PULL UP / DOWN resistor.
+Note: the OE is LOW active. 
+The user has to set the power on value by means of a PULL UP / DOWN resistor.
+
+
+#### I2C Software reset
+
+The goal of this function is to reset ALL PCA9635 devices on the bus.
+When using the software reset, ALL devices attached to the bus are set to their hardware startup conditions.
+Generally, there are multiple definitions of software resets by the I2C inventor NXP.
+To accommodate this, two different modes for this function have been defined and tested (see PCA9634).
+
+- Method 1 is a tested method which is specific to the PCA9634.
+Since the number of different types of I2C chips is very large, side-effects on other chips might be possible.
+Before using this method, consult the data sheets of all chips on the bus to mitigate potential undefined states.
+- Method 0 is a somewhat “general” method which resets many chips on the I2C-bus.
+However, this method DOES NOT reset the PCA9635 chip.
+Therefore, consult the data sheet of all different chips on the bus to mitigate potential undefined states.
+
+When only working with PCA9635 chips on a bus, only method 1 is required.
+
+```cpp
+ledArray.I2C_SoftwareReset(1);  //  for method 1
+ledArray.I2C_SoftwareReset(0);  //  for method 0
+```
+
+In case you experience issues with this function on your chips (non-PCA9635),
+please give feedback, so the documentation can be improved.
+
+For further details of the development, see - #10 (PCA9634 repo)
 
 
 ## Future
diff --git a/libraries/PCA9635/keywords.txt b/libraries/PCA9635/keywords.txt
index 389154e5..28502495 100644
--- a/libraries/PCA9635/keywords.txt
+++ b/libraries/PCA9635/keywords.txt
@@ -42,6 +42,8 @@ setOutputEnablePin	KEYWORD2
 setOutputEnable	KEYWORD2
 getOutputEnable	KEYWORD2
 
+I2C_SoftwareReset	KEYWORD2
+
 #
 # Constants (	LITERAL1)
 #
diff --git a/libraries/PCA9635/library.json b/libraries/PCA9635/library.json
index 3ef7f7cf..8267c94a 100644
--- a/libraries/PCA9635/library.json
+++ b/libraries/PCA9635/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/PCA9635.git"
   },
-  "version": "0.4.3",
+  "version": "0.4.4",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/libraries/PCA9635/library.properties b/libraries/PCA9635/library.properties
index 465d6a13..5e2fd20a 100644
--- a/libraries/PCA9635/library.properties
+++ b/libraries/PCA9635/library.properties
@@ -1,5 +1,5 @@
 name=PCA9635
-version=0.4.3
+version=0.4.4
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for PCA9635 I2C LED driver 16 channel