ATA6613-EK Atmel, ATA6613-EK Datasheet

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... ATA6612/ATA6613 - EK Development Board V1.1 Features • All Necessary Components to Put the ATA6612/ATA6613 in Operation Are Included • Placeholders for Some Optional Components for Extended Functions Included • All Pins Easily Accessible • Easily Adaptable Watchdog Times by Replacing a Single Resistor • Possibility to Activate an External NPN-transistor for Boosting Up the Output Current of the Voltage Regulator (Jumper JP3) • ...

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... Introduction The development board for the ATA6612/ATA6613 IC is designed to give designers a quick start with the ATA6612 and ATA6613 ICs and to enable prototyping and testing new LIN designs. The ATA6612 and ATA6613 form a single-package dual-chip circuit family for LIN-bus slave and master node applications. They support highly integrated solutions for in-vehicle LIN net- works ...

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... Bus pin is overtemperature and short circuit protected versus GND and battery • Adjustable watchdog time via external resistor The combination of the features included in ATA6612 and ATA6613 make it possible to develop simple, but 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 ...

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... Quick Start The development board for the ATA6612 and ATA6613 is shipped with the default jumper set- tings and all accessories required for immediate use. The IC mounted on the board is pre-programmed with a firmware in order to test and to under- stand the basic functions directly on the board. After correctly connecting an external 12V DC power supply between the terminals “ ...

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... Changing the fuse bit CKDIV8 to un-programmed, changes the microcontroller’s internal clock from 1 MHz to 8 MHz. Because of this the trigger signals generated from the microcontroller does not meet the open window from the window watchdog and a reset is generated. 9127A–AUTO–05/08 (51k ) = 49 ms has expired. d ATA6612/ATA6613 5 ...

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... Voltage Regulator (PVCC and VCC) The internal 5V voltage regulator is capable of driving loads with current con- sumption. Therefore, the ATA6612 and ATA6613 are able to supply the internal microcontroller, some external sensors, and/or other ICs required for the particular LIN node. The voltage regulator is protected against overloads by means of current limitation and over- temperature shutdown ...

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... With the values given in the datasheet, you can calculate all relevant watchdog times (for example the open window and the closed window) using t In general, both ATA6612 and ATA6613 are shipped with an oscillator start-up time of 65 ms. Due to the extra-long lead time of 155 ms it should be possible in almost all cases to meet the first open window of the watchdog ...

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... This pin reports the state of the LIN bus to the microcontroller. LIN high (recessive state) is reported by a high level at RXD; LIN low (dominant state) is reported by a low level at RXD. The output has an internal pull-up structure with typically VCC. ATA6612/ATA6613 8 > 6 ms, the LIN SBC switches the TXD state internally to DOM_min > ...

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... As the ADC6 as well as the ADC7 can only be used for converting analog signals to digital val- ues, and there is no analog output from the ATA6612 and ATA6613 to measure, these two input pins have been led off the board in order to be externally connected if required. ...

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... The three connections marked in bold are generated via jumpers and the other two connec- tions are generated via 0 resistors and equipped with a test point and therefore easy to access. ATA6612/ATA6613 10 Table 3-1 gives a summary of these pins. Summary of the Hard-wired Pins on the ATA6612/ATA6613 - EK Microcontroller Pin PC6/NRES PD3 PD4 PD1 PD0 ...

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... Port Connectors The ATA6612/ATA6613-EK has three port connectors for the microcontroller ports PortB, PortC and PortD. All non-reserved I/O-pins available from the microcontroller are routed to the corresponding connectors to give the user easy access to them. All three connectors provide, besides the port pins, a voltage supply pin (5V from the internal voltage regulator) and a ground pin in order to easily connect application-specific add-ons ...

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... PD4 pin. In this case, the enable input has to be controlled either by another I/O-pin from the microcontroller or it can be set fixed to Vcc. In both cases, the connection to the enable input has to be made via an extra 1-wire cable. ATA6612/ATA6613 12 9. Section 4.3 “Separating the Microcontroller and the LIN 16). Section 6. “ ...

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... LIN node to the users specific requirements. In the following sections these placeholders and components will be shown and described. 3.4.1 Configuring the ATA6612/ATA6613- Master or a Slave Node The LIN2.0 specification, as well as the LIN2.1 specification, stipulates that the master node in a LIN network has to be built up in the way depicted below. ...

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... Running the Microcontroller on External Clock For cases in which the accuracy of the internal RC-oscillator is not sufficient to meet the appli- cation-specific requirements, an external crystal oscillator plus the two capacitors can be mounted on the ATA6612/ATA6613 - EK. The location of these placeholders is shown in ure 3-5. Figure 3-5. ...

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... Changing the Watchdog Timings By default on the ATA6612/ATA6613 - EK, the watchdog timing is generated with the help resistor (R8) connected between pin WD_OSC and ground. In order to change these timings, the resistor R8 has to be replaced. Its location is shown in Figure 3-6. A description of how the resistor R8 influences the watchdog timing can be found in 3.1.3 “ ...

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... Combined with AVR Studio, the JTAGICE MkII can perform on-chip debugging on all AVR 8-bit RISC microcontrollers with JTAG Interface or debugWIRE interface. The ATA6612 and ATA6613 come with a debugWIRE interface so only a minimum of 3 wires is required for com- munication between JTAGICE MkII and the board. These Signals are RESET, VCC and GND. ...

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... Many OEMs demand that their suppliers use certified LIN protocol stacks from third party. To meet this requirement there are LIN2.0 as well as LIN2.1 protocol stacks available for the ATA6612 (Atmega88) as well as for the ATA6613 (Atmega168) from Mentor Graphics tor Informatik, and from Warwick Control Technologies. ...

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... MJD31C soldered on the minimum pad size is 80 K/W. This means that the possible maxi- mum output current in the case not recommended to exceed this limit as the transistor could be damaged as a result of overtemperature higher output current is required, additional cooling of the external tran- sistor has to be ensured. ATA6612/ATA6613 18 = 12V is approximately 230 mA at room temperature 9127A–AUTO–05/08 ...

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... Appendix 7.1 Schematic and Layout of the Development Board for the ATA6612/ATA6613 Figure 7-1. Schematic of the Development Board for the ATA6612/ATA6613 X5 PD1 PD0 PD1_TXD PD0_RXD DC-Socket PD3 NTRIG 1 JP2 2 1 TRIG PD4 EN 1 JP1 2 1 VDD ENABLE L1 C15 10 µH 100 nF X1 PB0 ...

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... Figure 7-2. Figure 7-3. ATA6612/ATA6613 20 ATA6612/ATA6613 Board Component Placement; Top Side, Top View ATA6612/ATA6613 Development Board; Top Side, Top View 9127A–AUTO–05/08 ...

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... Figure 7-4. 9127A–AUTO–05/08 ATA6612/ATA6613 Development Board; Bottom Side, Top View ATA6612/ATA6613 21 ...

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... Further Information 7.2.1 Datasheets 1. Datasheet ATA6612/ATA6613 complete version 2. Datasheet ATA6624 complete version 3. Datasheet ATmega48/88/168 Automotive 4. ATmega88 Automotive - 150°C Specification - Appendix A Preliminary 7.2.2 Application Notes 1. AVR140: ATmega48/88/168 family run-time calibration of the Internal RC oscillator This application note describes how to calibrate the internal RC oscillator via the UART. ...

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