I'm going to be doing a project using the TLC5916 LED driver which will control a TFT LCD. However, I could use some assistance as to how to properly configure and setup the driver. The display I am using requires 40mA @ 19.2V. So, I would need 40mA and 19.2V coming out of one pin (AKA one channel) to drive the LED backlight for the TFT display.
Looking through the datasheet I was able to ascertain the following:
CM=current multiplier
If CM = 1 then Iout target = (1.25V/Rext)x15
if CM= 0 then Iout target = (1.25V/Rext)x5
Also, if CM is 0 then the current output is limited to 3 to 40mA, else it is limited to 10mA to 120mA.
Using CM=0, and the equation Iout target = (1.25V/Rext)x5 and solving for Rext I get:
Iout target = 40mA
Rext = (5*1.25V/40mA) => 156.25 ohms or ~156 ohms
In addition, going off of pg. 24 of the datasheet, the 8-bit configuration code looks like:
01111111
So, my question are as follows:
1. Is the method I am using correct. Do I have the correct resistance?
2. Now that I have 40mA output current how do I get 19.2V. Do I need to take additional steps?
3. When hooked up to a microcontroller using SPI, is /OE essentially /CS?
4. How do I configure the TLC5916 to only utilize 1 channel for the output
If anyone can answer any of the above questions that would be much appreciated. Thank you.
EDIT:
Sorry about that, this is to control the LED backlight of a TFT LCD display.
Looking through the datasheet I was able to ascertain the following:
CM=current multiplier
If CM = 1 then Iout target = (1.25V/Rext)x15
if CM= 0 then Iout target = (1.25V/Rext)x5
Also, if CM is 0 then the current output is limited to 3 to 40mA, else it is limited to 10mA to 120mA.
Using CM=0, and the equation Iout target = (1.25V/Rext)x5 and solving for Rext I get:
Iout target = 40mA
Rext = (5*1.25V/40mA) => 156.25 ohms or ~156 ohms
In addition, going off of pg. 24 of the datasheet, the 8-bit configuration code looks like:
01111111
So, my question are as follows:
1. Is the method I am using correct. Do I have the correct resistance?
2. Now that I have 40mA output current how do I get 19.2V. Do I need to take additional steps?
3. When hooked up to a microcontroller using SPI, is /OE essentially /CS?
4. How do I configure the TLC5916 to only utilize 1 channel for the output
If anyone can answer any of the above questions that would be much appreciated. Thank you.
EDIT:
Sorry about that, this is to control the LED backlight of a TFT LCD display.
Last edited: