diff --git a/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/EliteCCMode.h b/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/EliteCCMode.h
index 1e66b58aa..ad8a1d6ef 100644
--- a/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/EliteCCMode.h
+++ b/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/EliteCCMode.h
@@ -2,9 +2,9 @@
 #ifndef ELITECCMODE
 #define ELITECCMODE
 
-#define CURRENT_LV_FOUR     4
-#define CURRENT_LV_THREE    3
-#define CURRENT_LV_TWO      2
+#define CC_ZERO_POINT     1500000
+#define MAX_DAC_UC    50000
+#define MIN_DAC_UC      0
 #define CURRENT_LV_ONE      1
 #define CURRENT_LV_ZERO     0
 
@@ -19,7 +19,8 @@ static void CCModeDACControl(int32_t IUC_Measure_Difference);
 typedef struct _CURRENT_USER_CODE {
 
     /** current value **/
-    // current value divide current level into 3e6 pieces
+    // current value divide current level into 3,000,001 pieces
+    // 1,500,000 is zero point
     int32_t value;
 
     /** ADC level range: 0-2 **/
@@ -29,6 +30,13 @@ typedef struct _CURRENT_USER_CODE {
     // else lv = GAIN_200K
     uint8_t lv;
 
+    /* Vmax and Vmin */
+    // Vmax protect battery charge
+    // Vmin protect battery discharge
+    // uint = mV
+    uint16_t Vmax;
+    uint16_t Vmin;
+
     /** transform a current user code (IUC) to real current in nA **/
     int32_t (*_Transform2RealnA)(struct _CURRENT_USER_CODE *);
 
@@ -47,6 +55,7 @@ static int32_t CCModeReadCurrent(CURRENT_USER_CODE *CurrentUserCode){
     int32_t Real_Current = 0;
     CCModeDACEnable = 1;    // This flag will control DAC working
 
+    // set current value and ADC gain level
     CCCurrent2IUC(CurrentUserCode);
 
     // set ADC gain according to constant current value
@@ -123,7 +132,7 @@ static void CCCurrent2IUC(CURRENT_USER_CODE *CurrentUserCode){
     int32_t CurrentValue = 0;
 
     CurrentUserCode->value = INSTRUCTION.ConstantCurrent;
-    CurrentValue = CurrentUserCode->value - 1500000;
+    CurrentValue = CurrentUserCode->value - CC_ZERO_POINT;
 
     /* set ADC level */
     // largest current
@@ -153,7 +162,7 @@ static int32_t _Transform2RealnA(CURRENT_USER_CODE *self){
     int32_t IUCReal;
 
     // self->value : 0 ~ 3000000 (which is -1500000 ~ 1500000 (10nA) )
-    IUCReal = (self->value - 1500000) * 10;
+    IUCReal = (self->value - CC_ZERO_POINT) * 10;
     return IUCReal;
 }
 
@@ -167,8 +176,10 @@ static int32_t GetMeasureCurrent(CURRENT_USER_CODE *self){
 
 static CURRENT_USER_CODE *InitCurrentUserCode(){
     CURRENT_USER_CODE *CurrentUserCode = malloc(sizeof(CURRENT_USER_CODE));
-    CurrentUserCode->lv = GAIN_200R;
-    CurrentUserCode->value = 1500000;
+    CurrentUserCode->value = CC_ZERO_POINT;
+    CurrentUserCode->lv = GAIN_AUTO;
+    CurrentUserCode->Vmax = MAX_DAC_UC;  // max DAC UserCode
+    CurrentUserCode->Vmin = MIN_DAC_UC;  // min DAC UserCode
     CurrentUserCode-> _MeasureCurrent = 0;
     CurrentUserCode->_Transform2RealnA = &_Transform2RealnA;
     CurrentUserCode->SetMeasureCurrent = &SetMeasureCurrent;
@@ -176,119 +187,4 @@ static CURRENT_USER_CODE *InitCurrentUserCode(){
     return CurrentUserCode;
 }
 
-/*********************************************************************
- * @fn      Transform2RealpA
- *
- * @brief   transform an IUC into real current value in pA.
- *
- * @param   self, which is an IUC
- *
- * @return  an int32_t current value in pA
- */
-static int32_t _Transform2RealpA(CURRENT_USER_CODE *self){
-    int32_t IUCReal;
-    /** current level range: 0-4 **/
-    // current level = 0 => 0-499 nA     => ADCGainLevel = 200K
-    // current level = 1 => 500-999 nA   => ADCGainLevel = 10K
-    // current level = 2 => 0-499 uA     => ADCGainLevel = 10K
-    // current level = 3 => 500-999 uA   => ADCGainLevel = 200R
-    // current level = 4 => 0-499 mA     => ADCGainLevel = 200R
-
-    // Saturate if current > 500 uA
-    if (self->lv == CURRENT_LV_FOUR){
-        return 0xFFFFFFFF;
-    }
-
-    if (self->lv == CURRENT_LV_THREE){
-        return 0xFFFFFFFF;
-    }
-
-    // 0-499 nA
-    if (self->lv == CURRENT_LV_ZERO){
-        IUCReal = (int32_t) (self->value) * 10;
-    }
-
-    // 500-999 nA
-    else if (self->lv == CURRENT_LV_ONE){
-        IUCReal = ((int32_t) (self->value + 50000) * 10);
-    }
-
-    // 0-499 uA
-    else if (self->lv == CURRENT_LV_TWO){
-        IUCReal = (int32_t) (self->value) * 1e4;
-    }
-
-    return IUCReal;
-}
-
-/*********************************************************************
- * @fn      CompareCurrent
- *
- * @brief   compare an int32 current with CURRENT_USER_CODE (IUC) type current.
- *
- * @param   unit is current unit (0 = pA, 1 = nA)
- *          value is current value
- *
- * @return  0 if equal
- *          1 if IUC is larger
- *          2 if int32 current is larger.
- */
-//static uint8_t CompareCurrent(CURRENT_USER_CODE *self, uint8_t unit, int32_t value){
-//    int32_t ErrorRangeIUCReal;
-//
-//    // unit = pA
-//    if (unit == 0){
-//        if (self->_Transform2RealpA(self) > value){
-//            return 1;
-//        }
-//        else if (self->_Transform2RealpA(self) < value){
-//            return 2;
-//        }
-//        else{
-//            return 0;
-//        }
-//    }
-//
-//    // unit = nA
-//    else if (unit == 1){
-//        if (self->_Transform2RealnA(self) > value){
-//            return 1;
-//        }
-//        else if (self->_Transform2RealnA(self) < value){
-//            return 2;
-//        }
-//        else{
-//            return 0;
-//        }
-//    }
-//}
-
-static void SetCCModeGain(CURRENT_USER_CODE *CurrentUserCode){
-    switch(CurrentUserCode->lv){
-        case CURRENT_LV_FOUR:{
-            INSTRUCTION.ADCGainLevel = GAIN_200R;
-            break;
-        }
-        case CURRENT_LV_THREE:{
-            INSTRUCTION.ADCGainLevel = GAIN_200R;
-            break;
-        }
-        case CURRENT_LV_TWO:{
-            INSTRUCTION.ADCGainLevel = GAIN_10K;
-            break;
-        }
-        case CURRENT_LV_ONE:{
-            INSTRUCTION.ADCGainLevel = GAIN_200K;
-            break;
-        }
-        case CURRENT_LV_ZERO:{
-            INSTRUCTION.ADCGainLevel = GAIN_200K;
-            break;
-        }
-        default :{
-            INSTRUCTION.ADCGainLevel = GAIN_200R;
-            break;
-        }
-    }
-}
 #endif