diff --git a/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.c b/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.c
index 337e324..0a2c264 100644
--- a/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.c
+++ b/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.c
@@ -7,8 +7,9 @@
 #include "wm_pwm.h"
 #include "i2c.h"
 #include "BMP280.h"
-#include "FreeRTOS.h" // <---- Only needed for the pdMS_TO_TICKS macro, to be removed
 #include "bma456w.h"
+#include "CST816D.h"
+#include "app_utils.h"
 
 #define INTERRUPT_POLICY (0)
 #define POLL_POLICY (1)
@@ -25,6 +26,10 @@ static uint8_t _vibration_motor_timer_id = WM_TIMER_ID_INVALID;
 static battery_controller_status_e _battery_fsm = BATTERY_CONTROLLER_STATUS_DISCHARGING;
 static BatteryControllerStatusChangeCb_t _BatteryControllerStatusChangeCb = NULL;
 
+/* Wakeup source boolean */
+static bool _wakeup_is_io = false;
+static bool _wakeup_is_timer = false;
+
 /* BMA456 strcture */
 struct
 {
@@ -128,6 +133,23 @@ static void battery_controller_irq_cb(void *p)
 }
 #endif
 
+typedef enum wakeup_source
+{
+    WAKEUP_SOURCE_IO = 0,
+    WAKEUP_SOURCE_TIMER,
+} wakeup_source_e;
+
+static void pmu_wakeup_source_irq_cb(void *arg)
+{
+    wakeup_source_e wakeup_source = (wakeup_source_e)arg;
+
+    if(wakeup_source == WAKEUP_SOURCE_IO)
+        _wakeup_is_io = true;
+
+    if(wakeup_source == WAKEUP_SOURCE_TIMER)
+        _wakeup_is_timer = true;
+}
+
 static void watch_peripherals_io_init(void)
 {
     /* We initialize the ADC input as well as the gpio used to enabled the voltage divider bridge */
@@ -150,6 +172,10 @@ static void watch_peripherals_io_init(void)
     tls_gpio_isr_register(BATTERY_CONTROLLER_CHARGING_STATUS, &(battery_controller_irq_cb), (int*) BATTERY_CONTROLLER_CHARGING_STATUS);
     tls_gpio_irq_enable(BATTERY_CONTROLLER_CHARGING_STATUS, WM_GPIO_IRQ_TRIG_DOUBLE_EDGE); // Enabled when level is changing edge
 #endif
+
+    /* We register the IRQs needed to determine the watch wake up source/reason */
+    tls_pmu_gpio_isr_register(&(pmu_wakeup_source_irq_cb), (void *)WAKEUP_SOURCE_IO);
+    tls_pmu_timer0_isr_register(&(pmu_wakeup_source_irq_cb), (void *)WAKEUP_SOURCE_TIMER);
 }
 
 #ifndef CASE_RETURN_STR
@@ -289,6 +315,26 @@ void watch_peripherals_set_orientation(LCDOrientation_e orientation)
     lcd_orientation(&LCDConfig, orientation);
 }
 
+bool watch_peripherals_wakeup_source_is_user(void)
+{
+    if(_wakeup_is_io)
+    {
+        _wakeup_is_io = false;
+        return true;
+    }
+    return false;
+}
+
+bool watch_peripherals_wakeup_source_is_timer(void)
+{
+    if(_wakeup_is_timer)
+    {
+        _wakeup_is_timer = false;
+        return true;
+    }
+    return false;
+}
+
 bool watch_peripherals_magnetometer_init(void)
 {
     /* Init the magnetometer */
@@ -405,11 +451,7 @@ static BMA4_INTF_RET_TYPE _bma4_i2c_write(uint8_t reg_addr, const uint8_t *read_
 static void _bma4_delay_us(uint32_t period, void *intf_ptr)
 {
     (void) intf_ptr;
-
-    if(period < 1000)
-        tls_os_time_delay(1);
-    else
-        tls_os_time_delay(pdMS_TO_TICKS(period / 1000));
+    us_delay(period);
 }
 
 bool watch_peripherals_accelerometer_init(void)
@@ -594,3 +636,17 @@ bool watch_peripherals_accelerometer_step_count_reset(void)
 
     return true;
 }
+
+void watch_peripherals_watch_sleep(void)
+{
+    extern LCDConfig_t LCDConfig;
+    // First, we disable the display backlight and we set all the peripherals in their low power mode
+    lcd_set_backlight(&LCDConfig, 0);
+    //lcd_on(&LCDConfig, false);
+    lcd_sleep(&LCDConfig, true);
+    watch_peripherals_magnetometer_power_mode_set(QMC5883L_Mode_Control_Standby);
+    if(CST816D_sleep())
+        APP_LOG_DEBUG("CST816D Sleep cmd ok");
+    else
+        APP_LOG_ERROR("CST816D Sleep cmd fail");
+}
diff --git a/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.h b/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.h
index 1a3402c..0ff1646 100644
--- a/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.h
+++ b/src/W800_SDK_v1.00.10/app/app_drivers/watch_peripherals/watch_peripherals.h
@@ -101,6 +101,22 @@ void watch_peripherals_set_brightness(uint8_t brightness);
  */
 void watch_peripherals_set_orientation(LCDOrientation_e orientation);
 
+/**
+ * @brief Check if the watch woke up because of the user(trigger on the wakeup pin : wrist tilt or touch screen).
+ * 
+ * @return true if the source of the wakeup is the user
+ * @return false otherwise
+ */
+bool watch_peripherals_wakeup_source_is_user(void);
+
+/**
+ * @brief Check if the watch woke up because of a timed event (timer 0 of the PMU module).
+ * 
+ * @return true if the source of the wake up is the timer 0
+ * @return false otherwise
+ */
+bool watch_peripherals_wakeup_source_is_timer(void);
+
 bool watch_peripherals_magnetometer_init(void);
 
 void watch_peripherals_magnetometer_calibration_data_set(
@@ -131,4 +147,6 @@ bool watch_peripherals_accelerometer_step_count_read(uint32_t *step_count);
 
 bool watch_peripherals_accelerometer_step_count_reset(void);
 
+void watch_peripherals_watch_sleep(void);
+
 #endif //WATCH_PERIPHERALS_H
\ No newline at end of file