Part Number:TLA2024
Hello,
I am using TLA2024 to implement some external input DC signal sampling, but the 1st step that debugging I2C communication has blocked me.
I used TI MCU MSP430F5438A to control this component, the MCU also controlled other 2 I2C components and these 2 components now are working well. The 3 I2C components are connected 3 different I2C bus, the already work well I2C components occupied UCB1 and UCB3, the TLA2024 occupy UCB2.
I did same I2C registers configuration for 2 I2C components, but this TLA2024 cannot complete a start operation. Below are the register setup SW codes,
***********************************************
/* I2C register configuration */
UINT8 i;
P9DIR |= 0x06; //P9.1 UCB2SDA, P9.2 UCB2SCL
P9OUT |=0x06; // pull SCL and SDA pins up and low before set to I2C function
for(i=0;i<20;i++)
{
}
P9OUT &=~0x06;
for(i=0;i<20;i++)
{
}
P9SEL |= 0x06; // Assign I2C pins to USCI_B2
UCB2CTL1 |= UCSWRST;
UCB2CTL0 = UCMST + UCMODE_3 + UCSYNC; //I2C Master, synchoronous mode
UCB2CTL1 = UCSSEL_2 + UCSWRST; //SMCLK, enable SW reset
UCB2BR0 = 0x32; // SMCLK/50(0x32)=80kHz(do no exceed 400kHz)
UCB2BR1 = 0;
UCB2I2CSA = 0x48; //Slave ADC(TLA2024) Addr：100 1000(D/C = 0)
UCB2CTL1 &= ~UCSWRST;
UCB2IE |= UCTXIE+UCRXIE; //Enable RX TX interrupt
for(i=0;i<100;i++)
{
}
/* start transfer data */
UCB2CTL1 |= UCTR;
while (IIC2_Start());
And then put data into UCB2TXBUF when TX buffer empty, did not paste all codes here.
/* sub-functions */
UINT8 IIC2_Start(void)
{
UCB2CTL1 |= UCTXSTT; // I2C start condition (NOTE 1)
return(UCB2IFG & UCNACKIFG);
}
********************************************************************************
The problem occur when executing trigger start condition command at (NOTE 1) Before execute this command the UCB2CTL0 = 0x0F, and UCB2CTL1 = 0x90 as the other 2 I2C components, but after this command, the other 2 I2C component's UCB2CTL1 will change to 0x92, that means the start condition is complete succeful, but the TLA2024's UCB2CTL1 still is 0x90, and then there will be a dead loop in the sub-function IIC2_Start().
The hardware design was intended to power TLA2024 to +5V, with a +5V to +3.3V I2C bus bridge to MCU, now has connect TLA2024 VCC pin to MCU +3.3V directly, and also SCL/SDA pins between MCU and TLA2024 directly.
Since used MSP430 USB2 function, I set TLA2024 I2C address 0x48 as other I2C components, but cannot work.
Can somebody help me check where is the problem?
I appreciate your support in advance!
Best Regards!
QM