EK-TM4C123GXL: About I2C write for ISET setup and some config. parameter by LED171596AWVM

Hi everyone, 

I need to control some LEDs (duration 10-50ms; Frequency 10-50Hz; Current 10-600uA; ) by using LED171596AWVM with TM4C123GXL. I already maximized the maxBri and the MasterBri with 0x1ff. So, the PWM should be 100%. The current output should only rely on the current value itself. However, I have some issue regarding ISET setup and some config. parameter.

1) I know how to set them but I don't know how parameter of the LED Driver, PWM and Sloper config, is reasonable to my project? (as fig,1)?

2) I can see the log in EVM software and I can select them (e.g. 10mA, 12.5, …, 60mA) (as fig.2). But I don't know how to I2C write this ISET to initial peak current with a program?

Thank you in advance!

Yale Li：

Hi, I will transfer these issues to the relevant engineer. Thanks for your patience.

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Yale Li：

Pls focus on the link below:

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1260894/ek-tm4c123gxl-about-i2c-write-for-iset-setup-and-some-config-parameter-by-led171596awvm

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Yale Li：

Could you pls specify the part number of this LED driver?

We didn't see this EVM before.

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YUNXIANG HUANG：

Hi Yale,

Thank you for concerning this issue! This board may be out of production. 

I read more detail datasheet of the LED171596A chip. Basically, I figured out how to configure above the parameter. For the ISET initiation, although I still don't know how to change the resistor through the address and data in the rheostat unit, I solved it by an external resistor with rated value.

So, all the problem basically is solved.

Thank you, anyway!

Yunxiang  

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YUNXIANG HUANG：

Cause I use an university account, I cannot reply to that question through this link on EN E2E.

Problem is basically solved now.

Thank you!

Yunxiang