SunFounder 3in1 Kit
1.11 I2C LCD1602
• GND: Ground
• VCC: Voltage supply, 5V.
• SDA: Serial data line. Connect to VCC through a pullup resistor.
• SCL: Serial clock line. Connect to VCC through a pullup resistor.
As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common
weakness. When they are connected to a controller, multiple IOs will be occupied of the controller which has no so
many outer ports. Also it restricts other functions of the controller.
Therefore, LCD1602 with an I2C module is developed to solve the problem. The I2C module has a built-in PCF8574
I2C chip that converts I2C serial data to parallel data for the LCD display.
• PCF8574 Datasheet
I2C Address
The default address is basically 0x27, in a few cases it may be 0x3F.
Taking the default address of 0x27 as an example, the device address can be modified by shorting the A0/A1/A2 pads;
in the default state, A0/A1/A2 is 1, and if the pad is shorted, A0/A1/A2 is 0.
24 Chapter 1. Components List and Introduction
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