====== lamaPLC: HT16K33 display controller ======
{{ :sensor:ht16k33_1.png?120|HT16K33 7-segment display}}
The **HT16K33** is a memory-mapped, multi-function LED controller driver. The maximum display segment count on the device is 128 patterns (16 segments and eight commons), with a 13×3 Maximum matrix key scan circuit. The software-configurable features of the HT16K33 make it suitable for a wide range of LED applications, including LED modules and display subsystems. The HT16K33 is compatible with most microcontrollers and communicates via a two-line bidirectional [[com:basic_i2c|I²C]] bus.

===== HT16K33 IC Feature =====  
  * Operating voltage: **4.5V–5.5V**
  * Integrated RC oscillator
  * I²C-bus interface
  * 16×8-bit RAM for display data storage
  * Max. 16×8 patterns, 16 segments, and eight commons
  * R/W address auto-increment
  * Max. 13×3 matrix key scanning
  * 16-step dimming circuit
  * Supports 20/24/28-pin SOP package types

|{{ :sensor:ht16k33_2.png?220|HT16K33 7-segment display}}|{{ :sensor:ht16k33_4.png?220|HT16K33 dot matrix display}}|{{ :sensor:ht16k33_5.png?220|HT16K33 dot matrix display}}|

===== I²C addressing ===== 
The base I²C address for an HT16K33 is **0x70**, but it can be changed to one of seven other addresses by setting the four address pins (**A0-A3**) via hardware. Each HT16K33 chip can have a unique address from **0x70** to **0x77**. If multiple HT16K33 devices are used on the same bus, each must have a distinct address, and if you use more than one, their addresses must be sequential, such as **0x70**, **0x71**, **0x72**. 

===== Schema =====
12*8 display application: (No INT pin function and 10*3 key function):
{{:sensor:ht16k33_3.png|12*8 display application: (No INT pin function and 10*3 key function)}}

===== Arduino ===== 
https://docs.arduino.cc/libraries/simple-ht16k33-library/


===== Sources =====
https://www.digikey.com/htmldatasheets/production/2070902/0/0/1/ht16k33.html

===== I²C topics on lamaPLC =====
{{topic>i2c}}

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