Mikroelektronika d.o.o.
ISO 9141 Click-Board
ISO 9141 Click-Board
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Der ISO 9141 Click Board™ ist eine kompakte Zusatzplatine, die einen monolithischen Bustreiber mit ISO 9141-Schnittstelle enthält. Diese Platine verfügt über den L9637, einen monolithischen integrierten Schaltkreis mit standardmäßigen ISO 9141-kompatiblen Schnittstellenfunktionen von ST Microelectronics. Sie ist für die bidirektionale serielle Kommunikation konzipiert, die mit dem ISO9141-Standard kompatibel ist. Sie verfügt über viele Funktionen wie einen großen Eingangs-/Ausgangsspannungsbereich, eine kontrollierte Ausgangssteigung für elektromagnetische Störungen, einen Standby-Modus mit geringem Stromverbrauch, eine Übertemperatur-Abschaltfunktion und mehr.
Das ISO 9141 Click Board™ eignet sich für Diagnoseanwendungen im Automobilbereich, wie etwa Antriebsstränge für Verbrennungsmotoren (CNG-/LPG-Motorsteuerung oder Diesel-/Benzineinspritzung), ein Automobil-Gateway in den Bereichen Telematik und Vernetzung und vieles mehr.
How Does The ISO 9141 Click Board™ Work?
The ISO 9141 Click Board™ is based on the L9637, a monolithic bus driver designed to provide bidirectional serial communication in automotive diagnostic applications according to the specification "Diagnostic Systems ISO9141" from ST Microelectronics. The L9637 is also known as the K-Line Transceiver that provides a bidirectional link, called K, and a separate comparator, called L, to the related diagnosis bus that can be connected on terminal labelled with K and L on this Click board™. The K and L pins are protected against overvoltages and reverse battery condition. During the lack of power supply or ground, all pins show high impedance characteristics.
The L9637 has a wide supply voltage in a range from 4.5V to 36V, as well as several modes of operation like Standby Mode with low current consumption and overtemperature Shut-Down Mode. The overtemperature Shut-Down Mode switches OFF the K output if the L9637's temperature increases above the thermal shut down threshold. To reactivate K again the temperature must decrease below the K switch ON temperature value. To achieve no fault for power supply under-voltage conditions the outputs will be switched OFF and stay at high impedance.
The ISO 9141 Click Board™ communicates with MCU using the UART interface with the default baud rate of 9600bps, and commonly used UART RX and TX pins for the data transfer. The UART input TX and output RX of K are associated with the logic voltage level from mikroBUS™ (VCC) with its integrated pull-up resistances. Also, the L comparator output pin named LO has a pull-up resistance connected to VCC. All bus defined inputs L and K have supply voltage-dependent thresholds together with sufficient hysteresis to suppress line spikes.
The ISO 9141 Click Board™ is easy to program because it does not require an overly demanding configuration. Only what is necessary for the errorless work is the selection of the appropriate mode of operation, whether the Click board™ will work as a receiver or transmitter. In this way, the transmitter will send the data every 2 seconds while the receiving side will receive the data in a "byte-by-byte" format. This can also be seen in an example code that contains easy to use functions that may be used as a reference for further development.
The ISO 9141 Click Board™ is designed to be operated with both 3.3V and 5V logic voltage levels that can be selected via VCC SEL jumper. This allows for both 3.3V and 5V capable MCUs to use the UART communication lines properly. However, the Click board™ comes equipped with a library that contains easy to use functions and an example code that can be used as a reference for further development.
SPECIFICATIONS
| Type | CAN |
| Applications | Can be used for automotive diagnostic applications such as powertrain for ICE (CNG/LPG engine control or diesel/gasoline injection), an automotive gateway in telematics and networking, and many more. |
| On-board modules | The ISO 9141 Click Board™ is based on the L9637, a monolithic bus driver designed to provide bidirectional serial communication in automotive diagnostic applications according to the specification "Diagnostic Systems ISO9141" from ST Microelectronics. |
| Key Features | Wide input and output voltage range, overtemperature shut down function, bidirectional K I/O pin with supply voltage dependent input threshold, Stand-by Mode with very low current consumption, and more. |
| Interface | UART |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of ISO 9141 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | NC | ||
| NC | 3 | CS | RX | 14 | TX | UART TX | |
| NC | 4 | SCK | TX | 13 | RX | UART RX | |
| NC | 5 | MISO | SCL | 12 | NC | ||
| NC | 6 | MOSI | SDA | 11 | NC | ||
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Power Supply Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
ISO 9141 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 4.5 | - | 36 | V |
| K output current | - | 60 | - | mA |
| Transmission frequency | - | - | 50 | kHz |
| Operating Temperature Range | -40 | - | +150 | °C |
Software Support
We provide a library for the ISO 9141 Click Board™ on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
The library covers all the necessary functions to control the ISO 9141 Click Board™. Library performs a standard UART interface communication.
Key Functions
void iso9141_write_byte ( uint8_t input )- Write Single Byte.uint8_t iso9141_read_byte ( void )- Read Single Byte.uint8_t iso9141_byte_ready ( void )- Check for new byte received.
Example Description
The application is composed of three sections :
- System Initialization - Initializes UART used for communication and another UART bus used for data logging.
- Application Initialization - Initializes UART driver. In addition to this module is placed inside transmitter working mode capable of transmission of the data.
- Application Task - (code snippet) - This is an example that demonstrates the use of the ISO 9141 Click Board™. Transmitter/Receiver task depend on uncommented code Receiver logging each received byte to the UART for data logging, while transmitted send messages every 2 seconds.
void application_task ( ) { char tmp; uint8_t drdy_flag; if ( app_mode == APP_MODE_RECEIVER ) { // RECEIVER - UART polling drdy_flag = iso9141_byte_ready( ); if ( 1 == drdy_flag ) { tmp = iso9141_read_byte( ); mikrobus_logWrite( &tmp, _LOG_BYTE ); } } else { // TRANSMITER - TX each 2 sec for ( tmp = 0; tmp < 9; tmp++ ) { iso9141_write_byte( demo_message_data[ tmp ] ); Delay_ms( 10 ); } mikrobus_logWrite( " Message Sent! ", _LOG_LINE ); mikrobus_logWrite( "-------------------", _LOG_LINE ); Delay_ms( 2000 ); } }The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
- UART
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The ISO 9141 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
ISO 9141 Click-Board
Frequently Asked Questions
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