CY3220LINBUS-RD is a complete design kit implementing the LIN bus (Local Interconnect Network) communication capabilities in PSoC.  The design kit includes the necessary software, hardware, and example projects for designers to implement all of the functions of the LIN specifications without having to generate any new code.  The LIN Protocol Specification is a low-speed communications standard used in many automotive applications, including body control, driver information, multimedia, climate control, safety equipment, cockpit electronics and Human Machine Interface (HMI).

• LIN Bus Reference Design Board
• Three preprogrammed and preinstalled PSoC devices (two bus slaves, one CY8C27143-24PXI LIN and one CY8C27443-24PXI LIN, and one bus master, CY8C27443-24PXI LIN)
• Software CD with Documentation, Example Projects, and Reference Design IP
• 12V Power Supply
• International Supply Adapter
• DB9 Serial Cable

The majority of today’s laptops include multimedia capabilities. Access to these functions as well as general-purpose functions are often located on a multimedia strip near the laptop’s keyboard.

With PSoC’s capacitive sensing technologies, these functions can be implemented without mechanical buttons resulting in a sleeker look. This element describes a reference design for a PSoC Capsense multimedia board.

The ability to use proximity detection in white goods and automotive applications is often essential. For example, proximity detector is used to turn on the backlight in a kitchen stove or the internal lamp in a microwave oven when the palm is close to the door. In various home appliances a proximity sensor turns on the display when the user tries to adjust some parameters. Cypress provides a CY3235 kit that demonstrates proximity sensing. The CY3235 kit has a detection range of 30 cm when the sensor is located far away from conductive objects such as metals. When a wire sensor is placed on a metal surface, detection range dramatically decreases from 30 cm to 2 cm. Most white good and automotive applications have a metal frame or case that is a challenge for proximity sensing devices.

This CY3235 kit contains a wired sensor and small PCB with CY8C21434 chip on board, as shown in Figure 1. The reasons why the proximity detection range reduces dramatically when conductive objects are placed close to the sensor are:

• The sensor stray capacitance increases. Stray capacitance reduces the proximity response value by providing a higher full scale range. Larger stray capacitance often requires operation frequency reduction, causing the additional detection distance to decrease.
• A grounded metal plane catches a part of the sensor electric field and reduces the added by palm capacitance.

Figure 1. CY3235 Proximity Detector Demonstration Kit