I2C Interfacing lpc111x with qt1050

Hi all,

I need to interface a cap-sensor, so i'm using a I2C bus to communicate between two controllers i.e.,

LPC111X[TARGET BOARD] to QT1050 [controller for touch sensor].

I have run through a simple code comparing the examples, and connected 4wires from target lpc111x to qt1050 i.e., as below:

SCL<-> SCL, SDA <-> SDA, VCC <-> VCC, GND <-> GND.

int main()
 {
	 while(1)
	 {
 i2c_lpc1_init(0x40);
//  PINSEL0 = 0x50
 LPC_I2C->SCLH = 75;
 LPC_I2C->SCLL = 75;
 LPC_I2C->CONSET = I2C_FLAG_I2EN;


 LPC_I2C->CONSET |= I2C_FLAG_STA;
 while(LPC_I2C->STAT != 0X08)


//  LPC_I2C->DAT = EEPROM_WRITE;
 LPC_I2C->CONCLR = I2C_FLAG_AA|I2C_FLAG_SI;
 while(LPC_I2C->STAT != 0X18);


 LPC_I2C->DAT = WORD_ADDR_MSB;
 LPC_I2C->CONCLR = I2C_FLAG_AA|I2C_FLAG_SI|I2C_FLAG_STA;
 while(LPC_I2C->STAT != 0X28);


 LPC_I2C->DAT = WORD_ADDR_LSB;
 LPC_I2C->CONCLR = I2C_FLAG_AA|I2C_FLAG_SI;
 while(LPC_I2C->STAT != 0X28);


//I2C0DAT = DATA;
//LPC_I2C->DAT = ICDATA;
 
 LPC_I2C->DAT |= TEST_LED1;//DAT
 delay(20);
 LPC_I2C->DAT &= ~TEST_LED1;
 delay(20);
 
 LPC_I2C->CONCLR = I2C_FLAG_AA|I2C_FLAG_SI;
 while(LPC_I2C->STAT != 0X28);


 LPC_I2C->CONSET = I2C_FLAG_STO;
 LPC_I2C->CONCLR = I2C_FLAG_AA|I2C_FLAG_SI;
 }

But my question is how to set the address pin for I2C in qt1050 controller and communicate that with target board[master & slave],

So can any one tell me how to communicate between this two controller.

Thanks in advance.