ATA6625-EK Microchip

APPLICATION NOTE ATA6620, ATA6620N, ATA6623, ATA6623C, ATA6625, ATA6625C Development Board ATA6620/23/25 Introduction The development board for the Atmel ATA6620/23/25 (ATA6620-EK, ATA6623-EK, ATA6625-EK) is designed to give designers a quick start with these ICs and for the proto- typing and testing of new LIN designs. The Atmel ATA6620 and the Atmel ATA6625 are fully integrated LIN transceivers including a low-drop voltage regulator providing 5V/85mA. The only difference between the two parts is the improved EMC behavior of the Atmel ATA6625. The Atmel ATA6623 is pin and func- tion compatible with the Atmel ATA6620/25, but on the Atmel ATA6623 the voltage at the regulators output is 3.3V instead of 5V. The combination of LIN transceiver and voltage regulator makes it possible to develop simple, powerful, and cheap slave nodes in LIN bus systems. The ICs are designed to handle the low-speed data communication in vehicles, for example in convenience electronics. Improved slope control at the LIN-driver ensures secure data communication up to 20Kbaud. Besides normal mode there are two other modes, sleep mode and silent mode, which give the designer the opportunity to create modules which meet the different requirements of the application with respect to low current consumption. This document has been developed to give the user a quick start using the development board for the Atmel ATA6620/23/25. For more detailed information about the devices them- selves, refer to the corresponding datasheets. Figure 1. Atmel ATA6620/23/25 Development Board 4969C-AUTO-07/15Development Board Features The development board for the Atmel ATA6620/23/25 supports the following features: All components necessary for all three circuits are mounted All pins are easily accessible Can be used for master or slave operation One board for three devices Quick Start The development board for the Atmel ATA6620/23/25 is shipped with all necessary components to start the development of a LIN slave node immediately. Connecting an external 12V DC power supply with the terminals VBAT and GND puts the Atmel ATA6620/23/25 in pre- normal mode, where a 5V (3.3V) DC voltage provided by the internal voltage regulator can be measured between VCC and GND. In addition, the following voltages can be measured at the pins RXD and LIN: Table 1. Quick Start ATA6620 ATA6623 ATA6625 VCC VCC VCC RXD LIN Transceiver Pre-normal mode 5V 3.3V 5V High Recessive Off Normal mode 5V 3.3V 5V High Recessive On Note that the communication is still inactive during pre-normal mode. In order to communicate via the LIN bus interface you have to switch to normal mode by applying the VCC voltage (5V or 3.3V, as appropriate) at pin EN. 2 ATA6620/23/25 APPLICATION NOTE 4969CAUTO07/15