MIKROE-2452

MIKROE-2452 Datasheet

PID MIKROE-2452

Part	Datasheet
MIKROE-2452	MIKROE-2452 (pdf)

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OBDII click PID MIKROE-2452 Weight 35 g OBDII click offers a unique opportunity to tap inside the car diagnostic systems. It features the STN1110 Multiprotocol OBD to UART Interface, developed by the ScanTool technologies. This click can be used for the communication with the Electronic Control Unit ECU of a vehicle, via several different OBD II diagnostic protocols such as CAN, K LINE, L LINE and J1850. The STN1110 IC is used to process requests sent by the MCU via the UART interface and return back the responses from the ECU network nodes. The STN1110 Multiprotocol OBD to UART IC is built around a fast 16bit processor core and has large memory buffer. It also features automatic protocol recognition, it is fully compatible with the ELM327 and ELM327 Extended AT command set and can be used on UART speed up to 10Mbps. Those features make this click more than a perfect solution for various designs, including custom car dashboards, OBD data loggers, Automotive diagnostic scan tools and similar applications. How does the click work? The standard prescribes a set of defined PIDs or Parameter IDs to communicate with the vehicle onboard computer ECU and return values from the corresponding locations of the vehicle's controller network, related to a specific PID. There are 10 modes of operation described in the latest OBD II standard. Vehicle manufacturers are not required to support all 10 modes and may add some additional modes. The expected response for each PID is strictly defined, along with information on how to translate the response into meaningful data. STN1110 is an OBD to UART interpreter IC that can be used to convert messages between the currently supported OBD-II protocols and the UART. It is fully compatible with the commonly used ELM327 device command set. OBD II standard also prescribes that each OBD II compliant vehicle should be equipped with a standard diagnostic connector DLC , which makes connecting and reading data from various types of vehicles possible by using the same device. To achieve successful communication with various systems used inside the vehicle diagnostic network, the STN1110 needs the signals to be converted on a physical level. For this reason, the Click Board also comes equipped with the MCP2551 - an ISO-11898 standard compliant CAN signal transceiver, as well as the LM339 - quad differential comparator IC, that is used to convert K Line, L Line and J1850 line signals into a proper digital format. There is a separate analog pin available on the STN1110 IC, which is used for the car battery voltage measurement. This function is handy when checking communication on the UART side of the IC. Besides requesting the voltage level information from the ECU via the command, it can also be measured directly from the battery voltage divider, with no special communication protocol used. The click is equipped with four signaling LEDs, that are used to monitor data transfer on the click-OBD side, as well as on the click-MCU side OBD RX/TX and UART RX/TX . Besides the Power LED PWR used to indicate that the click, there is also a LED that indicates the presence of battery voltage on the OBD connector, and it is labeled as BAT. The OBDII click comes equipped with the D-Sub 9 connector also known as DB9 that allows using a standard OBDII cable. Note The OBDII cable does not come with the package. After the initial protocol auto-recognition which might require the ignition switch to be turned on and the initialization AT command to be sent , all the communication between the vehicle ECU and the STN1110 is done automatically, so it is possible to get readings of the vehicle systems status effortlessly, by sending simple AT commands via the UART pins of the click. MikroElektronika provides simplified libraries that take care of the proper communication between the click and the MCU via the UART. For the complete list of available AT commands, please refer to the product documentation. Specifications Type It can be used for diagnostic purposes, or for making a custom car dashboard. The click intermediates between the MCU and the vehicle Electronic Control Unit ECU . On-board modules STN1110 from ScanTool, an OBD to UART interpreter IC designed to provide bidirectional half-duplex communication with the vehicle’s On-Board Diagnostic System OBD-II . Full OBD-II support, compatible with the ELM327 AT extended command set, fast Key Features communication speed and reliability, superior automatic protocol detection algorithm, large memory buffer, separate voltage input for the direct battery monitoring. Interface GPIO,UART Input Voltage 3.3V Click board size L x mm Pinout diagram This table shows how the pinout on OBDII click corresponds to the pinout on the mikroBUS socket the latter shown in the two middle columns . Notes Notes NC 1 AN PWM 16 NC Reset RST 2 RST 15 INT Interrupt NC 3 CS 14 TX UART TX 4 SCK 13 RX UART RX NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power supply 3V3 7 3.3V 5V

PDF Datasheet Preview

OBDII click

PID MIKROE-2452

Weight 35 g

OBDII click offers a unique opportunity to tap inside the car diagnostic systems. It features the STN1110 Multiprotocol OBD to UART Interface, developed by the ScanTool technologies. This click can be used for the communication with the Electronic Control Unit ECU of a vehicle, via several different OBD II diagnostic protocols such as CAN, K LINE, L LINE and J1850. The STN1110 IC is used to process requests sent by the MCU via the UART interface and return back the responses from the ECU network nodes.

The STN1110 Multiprotocol OBD to UART IC is built around a fast 16bit processor core and has large memory buffer. It also features automatic protocol recognition, it is fully compatible with the ELM327 and ELM327 Extended AT command set and can be used on UART speed up to 10Mbps. Those features make this click more than a perfect solution for various designs, including custom car dashboards, OBD data loggers, Automotive diagnostic scan tools and similar applications.

How does the click work?

The standard prescribes a set of defined PIDs or Parameter IDs to communicate with the vehicle onboard computer ECU and return values from the corresponding locations of the vehicle's controller network, related to a specific PID. There are 10 modes of operation described in the latest OBD II standard. Vehicle manufacturers are not required to support all 10 modes and may add some additional modes. The expected response for each PID is strictly defined, along with information on how to translate the response into meaningful data. STN1110 is an OBD to UART interpreter IC that can be used to convert messages between the currently supported OBD-II protocols and the UART. It is fully compatible with the commonly used ELM327 device command set. OBD II standard also prescribes that each OBD II compliant vehicle should be equipped with a standard diagnostic connector DLC , which makes connecting and reading data from various types of vehicles possible by using the same device. To achieve successful communication with various systems used inside the vehicle diagnostic network, the STN1110 needs the signals to be converted on a physical level. For this reason, the Click Board also comes equipped with the MCP2551 - an ISO-11898 standard compliant CAN signal transceiver, as well as the LM339 - quad differential comparator IC, that is used to convert K Line, L Line and J1850 line signals into a proper digital format. There is a separate analog pin available on the STN1110 IC, which is used for the car battery voltage measurement. This function is handy when checking communication on the UART side of the IC. Besides requesting the voltage level information from the ECU via the command, it can also be measured directly from the battery voltage divider, with no special communication protocol used.

The click is equipped with four signaling LEDs, that are used to monitor data transfer on the click-OBD side, as well as on the click-MCU side OBD RX/TX and UART RX/TX . Besides the Power LED PWR used to indicate that the click, there is also a LED that indicates the presence of battery voltage on the OBD connector, and it is labeled as BAT. The OBDII click comes equipped with the D-Sub 9 connector also known as DB9 that allows using a standard OBDII cable.

Note The OBDII cable does not come with the package.

After the initial protocol auto-recognition which might require the ignition switch to be turned on and the initialization AT command to be sent , all the communication between the vehicle ECU and the STN1110 is done automatically, so it is possible to get readings of the vehicle systems status effortlessly, by sending simple AT commands via the UART pins of the click. MikroElektronika provides simplified libraries that take care of the proper communication between the click and the MCU via the UART. For the complete list of available AT commands, please refer to the product documentation.

Specifications

Type

It can be used for diagnostic purposes, or for making a custom car dashboard. The click intermediates between the MCU and the vehicle Electronic Control Unit ECU .

On-board modules

STN1110 from ScanTool, an OBD to UART interpreter IC designed to provide bidirectional half-duplex communication with the vehicle’s On-Board Diagnostic System OBD-II .

Full OBD-II support, compatible with the ELM327 AT extended command set, fast Key Features communication speed and reliability, superior automatic protocol detection algorithm,
large memory buffer, separate voltage input for the direct battery monitoring.

Interface

GPIO,UART

Input Voltage 3.3V

Click board size

L x mm

Pinout diagram

This table shows how the pinout on OBDII click corresponds to the pinout on the mikroBUS socket the latter shown in the two middle columns .

Notes

Notes

NC 1 AN

PWM 16 NC

Reset

RST 2 RST
15 INT Interrupt

NC 3 CS
14 TX

UART TX
4 SCK
13 RX UART RX

NC 5 MISO SCL
12 NC

NC 6 MOSI SDA 11 NC

Power supply
3V3 7 3.3V 5V

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MIKROE-2452 Datasheet file may be downloaded here without warranties.

Datasheet ID: MIKROE-2452 649338