# Detailed Description

The IS3750 is an Addressable LED Controller accessed via I2C. It can control from a single LED up to a strip of 1,200 RGB LEDs. It is designed to offload the LED data timing and transmission tasks from microcontrollers and FPGAs. The chip is available in two temperature ranges: Industrial (-40ºC to +85ºC) and Extended (-40ºC to +125ºC).

The IS3750 consists of three modules: the I2C-Serial Interface, the Memory Map, and the Render.

<figure><img src="/files/Sr1WFOBXvM4M2X3CAuqF" alt="" width="375"><figcaption></figcaption></figure>

### I2C-Serial Interface Module

Data is sent via I2C from the user application (microcontroller, FPGA, single-board computer, or any I2C master) to the IS3750's internal memory map.

The IS3750 acts as an I2C slave, eliminating the need for a dedicated pin on the microcontroller, since it uses a shared bus.

The I2C interface supports Standard Mode (100kHz), Fast Mode (400kHz), and Fast Mode Plus (1MHz). A dedicated pin (I2CSPD) configures the appropriate internal filters for the selected speed.

The chip operates at a 3.3 V. Its I2C pins are 5 V tolerant, making it compatible with both 3.3 V and 5 V microcontrollers.

### LED Memory Map Module

Each LEDx memory register represents the brightness of one color of a LED. The chip includes 3,600 registers, allowing control of up to 1,200 RGB addressable LEDs:

3,600 registers ÷ 3 colors = 1,200 LEDs.

LEDs with more than three colors or with non-standard color orders can also be controlled.

### LED Render Module

Writing a 1 to a special register called SHOW, activates the LED Render module. This triggers a read of all LEDx registers and generates the corresponding output signal on the LED pin.

The LED pin operates at 3.3 V. When interfacing with 5 V LEDs, a buffer, Schmitt trigger, or level shifter is required to adapt it’s 3.3 V to 5 V. Refer to chapter “Hardware Example” for more details


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://inacks.gitbook.io/is3750-wiki/datasheet/detailed-description.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.