SNVSAJ8D February 2016 – March 2018 LM36273
PRODUCTION DATA.
In exponential mapped mode the LED current follows the relationship:
This results in an LED current step size of approximately 0.304% per code. This is valid for codes from 1 to 2047. Code 0 programs 0 current. Code is an 11-bit code that can be the I2C brightness code or the product of the I2C brightness code and the PWM duty cycle. Figure 33 details the LED current exponential response.
The 11-bit (0.304%) per code step is small enough such that the transition from one code to the next in terms of LED brightness is not distinguishable to the eye. This, therefore, gives a perfectly smooth brightness increase between adjacent codes.