diff --git a/configs/stm32f4discovery/src/Makefile b/configs/stm32f4discovery/src/Makefile
index ee5a1a172f..93bcf84d5c 100644
--- a/configs/stm32f4discovery/src/Makefile
+++ b/configs/stm32f4discovery/src/Makefile
@@ -64,6 +64,10 @@ ifeq ($(CONFIG_MAX6675),y)
 CSRCS += stm32_max6675.c
 endif
 
+ifeq ($(CONFIG_PCA9635PW),y)
+CSRCS += stm32_pca9635.c
+endif
+
 ifeq ($(CONFIG_STM32_SDIO),y)
 CSRCS += stm32_sdio.c
 endif
diff --git a/configs/stm32f4discovery/src/stm32_bringup.c b/configs/stm32f4discovery/src/stm32_bringup.c
index dc2e7c9f18..fbd54f55f7 100644
--- a/configs/stm32f4discovery/src/stm32_bringup.c
+++ b/configs/stm32f4discovery/src/stm32_bringup.c
@@ -101,6 +101,16 @@ int stm32_bringup(void)
   stm32_zerocross_initialize();
 #endif
 
+#if defined(CONFIG_PCA9635PW)
+  /* Initialize the PCA9635 chip */
+
+  ret = stm32_pca9635_initialize();
+  if (ret < 0)
+    {
+      sdbg("ERROR: stm32_pca9635_initialize failed: %d\n", ret);
+    }
+#endif
+
 #ifdef HAVE_SDIO
   /* Initialize the SDIO block driver */
 
diff --git a/configs/stm32f4discovery/src/stm32_pca9635.c b/configs/stm32f4discovery/src/stm32_pca9635.c
new file mode 100644
index 0000000000..aa979185ba
--- /dev/null
+++ b/configs/stm32f4discovery/src/stm32_pca9635.c
@@ -0,0 +1,102 @@
+/************************************************************************************
+ * configs/stm32f4discovery/src/stm32_pca9635.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/i2c.h>
+#include <nuttx/pca9635pw.h>
+
+#include <arch/irq.h>
+
+#include "stm32f4discovery.h"
+#include "stm32_gpio.h"
+
+#ifdef CONFIG_PCA9635PW
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_pca9635_initialize
+ *
+ * Description:
+ *   This function is called by board initialization logic to configure the
+ *   LED PWM chip.  This function will register the driver as /dev/leddrv0.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int stm32_pca9635_initialize(void)
+{
+
+  FAR struct i2c_dev_s *i2c;
+  int ret;
+
+  /* Get the I2C driver that interfaces with the pca9635 (PCA9635_I2CBUS)*/
+
+  i2c = up_i2cinitialize(PCA9635_I2CBUS);
+  if (!i2c)
+    {
+      dbg("ERROR: Failed to initialize I2C%d\n", PCA9635_I2CBUS);
+      return -1;
+    }
+
+  ret = pca9635pw_register("/dev/leddrv0", i2c, PCA9635_I2CADDR);
+  if (ret < 0)
+    {
+      sndbg("Failed to register PCA9635 driver: %d\n", ret);
+     return ret;
+    }
+
+  return OK;
+}
+
+#endif /* CONFIG_PCA9635PW */
diff --git a/configs/stm32f4discovery/src/stm32f4discovery.h b/configs/stm32f4discovery/src/stm32f4discovery.h
index 73024bc40b..58a9e3d7d0 100644
--- a/configs/stm32f4discovery/src/stm32f4discovery.h
+++ b/configs/stm32f4discovery/src/stm32f4discovery.h
@@ -62,6 +62,9 @@
 #  undef CONFIG_STM32_SPI3
 #endif
 
+#define PCA9635_I2CBUS  1
+#define PCA9635_I2CADDR 0x40
+
 /* Assume that we have everything */
 
 #define HAVE_USBDEV     1
@@ -556,6 +559,26 @@ int stm32_zerocross_initialize(void);
 int stm32_max6675initialize(FAR const char *devpath);
 #endif
 
+/****************************************************************************
+ * Name: stm32_pca9635_initialize
+ *
+ * Description:
+ *   This function is called by board initialization logic to configure the
+ *   LED PWM chip.  This function will register the driver as /dev/leddrv0.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PCA9635PW
+int stm32_pca9635_initialize(void);
+#endif
+
 /****************************************************************************
  * Name: up_timer_init
  *