BR16F84-1.07 ETC, BR16F84-1.07 Datasheet

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BR16F84-1.07

Manufacturer Part Number
BR16F84-1.07
Description
OBD II Interface Chip
Manufacturer
ETC
Datasheet
BR16F84-1.07
OBD II Interface Chip Data Sheet
For PWM, VPW, and ISO 9141-2 Vehicles
VPW (general motors), PWM (Ford products), and ISO 9141-2 (Asian/European)
Final Release Date: Jul 8 2001
If you are using a completed unit, you don't need to read this data sheet. This data sheet is intended for
those who are building their own hardware using the BR16F84-1.07 Chip, or writing custom software to
employ this device in a particular application.
GENERAL DESCRIPTION:
This device is a CMOS microcontroller which is designed to interface a personal computer or laptop with a
vehicle's On Board Diagnostic (OBD II) interface. It is intended to function with all three of the protocols used
by vehicle manufacturers to implement the OBD II system as defined by SAE and ISO specifications. The
OBD II system became mandatory for 1996 and up vehicles, but some vehicles were already fully or partially
compatible with OBD II requirements prior to 1996. The chip is not suitable for the earlier vehicles such as
OBD I.
The device is intended to function as a simple scan tool and is capable of sending and receiving any OBD II
message defined in SAE J1979 for any of the three types of OBDII bus implementations (PWM, VPW, ISO
9141-2). It can also be used as an inexpensive interface for custom instrumentation monitoring various
vehicle parameters such as speed, RPM, coolant or intake air temperature, engine load, intake air flow rate,
etc.
FEATURES:
Operating Voltage
Operating Current
Clock: 20 MHz
Inputs: (0-5V levels)
Outputs (0-5V levels)
Serial Input (19200 Baud)
PWM receive
VPW receive
ISO 9141-2
Serial output (19200 Baud)
PWM transmit bus+ (inverted)
PWM transmit bus- (inverted)
VPW transmit
ISO 9141-2 L line transmit (inverted)
ISO 9141-2 K line transmit (inverted)
5.0 V
5 Ma. Typ
Firmware Version: 1.07 Chip ID# 107F
1

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BR16F84-1.07 Summary of contents

Page 1

... Final Release Date: Jul 8 2001 If you are using a completed unit, you don't need to read this data sheet. This data sheet is intended for those who are building their own hardware using the BR16F84-1.07 Chip, or writing custom software to employ this device in a particular application. ...

Page 2

... It is available in several package designs and temperature ratings. The baseline BR16F84-1.07 chip is a microchip 16F84A-20/P part, which is a commercial temperature range plastic 18 pin DIP rated at 20 MHz. The device can be special ordered if other package designs, temp ratings, etc are desirable ...

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... Quad Comparator 16F84 Microprocessor 20 MHz Crystal, 20 Mhz Miscellaneous: Board, connectors, cable, wire, sockets, enclosure, etc, Depending on your implementation. NOTES: 1) All Resistors can be 5% Carbon Film types (Don't use wirewound types) 2) Capacitor voltage ratings can be higher than specified. 3) Capacitors can be ceramic or monolithic. ...

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CHIP COMMANDS AND RESPONSES: This section details the information needed to send and receive data to the chip from a host computer. It will enable you to write your own software to utilize the chip with whatever host computer or ...

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INITIALIZING THE CHIP AND THE VEHICLE Before normal communications can start, the host must establish communication with the chip, then it must initialize the chip and the vehicle's data link. (1) CHIP CONNECT After the unit is connected to the ...

Page 7

... The response is therefore one or more message frames as defined in SAE J1979. The chip performs no analysis of frames, does not reject non-diagnostic frames, etc. The host must process this data to extract particular frames by looking for the header bytes. For most data requests, there is only one response frame ...

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Notes and updated information: The above information is basically unchanged for later versions. Omissions, changes and errata are listed below. Bus contention error message: This applies to PWM and VPW protocols only bus contention occurs, the interface will ...

Page 9

Interface Chip Changes for later versions: This document specifies the changes in chip operation for later versions. It defines how to use it for ISO 14230 for both fast and slow initialization. There are also some changes that may affect ...

Page 10

CIRCUIT NOTES FOR THOSE BUILDING THEIR OWN INTERFACE : The schematic is shown with simple pads for signals to the vehicle and the personal computer. Below is information to wire the connector to the vehicle and also the connector to ...

Page 11

All other pins are not used. Normally, you do not need a shield present, the shield need not be connected recomended to keep the cable length less, but you may be able to ...

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