OPT3001 successive readings through I2C bus needs 1 second delay

Jason Bridgmon,

I have set for Configuration Register Field Description:

[15:12]   RN[3:0]     1100b    -  automatic full-scale setting mode

 [11]          CT           0b          -   The 100-ms conversion time

[10:9]       M[1:0]      01b        -   Single-shot

I am using I2C configuration data rate is 

param.dataRate = EUSCI_B_I2C_SET_DATA_RATE_400KBPS;

with above configuration, for proper data from OPT3001 needs 1 second delay between successive readings. Please suggest, if I need to do any change to configuration register.

Thanks & Regards

Suresh

Suresh,

Have you looked at the communication lines with an oscilloscope to make sure you're getting what you think you're getting? Are you polling the configuration register to see when the conversion data is ready?

It would be good if you posted the code you're using here or send it to my email if it is something you don't want to share. I'm at Bridgmon_Jason@ti.com.

Jason Bridgmon,
Problem solved.
I have maintained 100msec delay between initiating conversion and reading the data from OPT3001.
but i have increased this delay to 105msec, then it start working. Now I can able to read 9 values per second.
code snippet is as mentioned below:
p_i2c_transmitData = (uint8_t *)OPT3001_initMEAS1; //Transmit array start address
i2c_transmitCounter = sizeof OPT3001_initMEAS1; //Load transmit byte counter
i2c_write(OPT3001_ADDRESS);

__delay_cycles(DELAY_100_MS);
__delay_cycles(DELAY_1_MS);
__delay_cycles(DELAY_1_MS);
__delay_cycles(DELAY_1_MS);
__delay_cycles(DELAY_1_MS);
__delay_cycles(DELAY_1_MS);

p_i2c_transmitData = (uint8_t *)OPT3001_ResultAddr; //Transmit array start address
i2c_transmitCounter = sizeof OPT3001_ResultAddr; //Load transmit byte counter
i2c_write(OPT3001_ADDRESS);

p_i2c_receivedData = (uint8_t *)Lux_Meas1_MSB; //Receive array start address
i2c_read_byte(OPT3001_ADDRESS, sizeof Lux_Meas1_MSB); //Read two bytes of lux data form result register

Thanks & Regards
Suresh