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PDF BR16F84-1.07 Data sheet ( Hoja de datos )
| Número de pieza | BR16F84-1.07 | |
| Descripción | OBD II Interface Chip | |
| Fabricantes | ETC | |
| Logotipo |  |
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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
Firmware Version: 1.07 Chip ID# 107F
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.
omGENERAL DESCRIPTION:
.cThis 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
Uby vehicle manufacturers to implement the OBD II system as defined by SAE and ISO specifications. The
t4OBD 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.
eThe device is intended to function as a simple scan tool and is capable of sending and receiving any OBD II
emessage defined in SAE J1979 for any of the three types of OBDII bus implementations (PWM, VPW, ISO
h9141-2). 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.
taSFEATURES:
aOperating Voltage
Operating Current
.DClock: 20 MHz
5.0 V
5 Ma. Typ
Inputs: (0-5V levels)
wSerial Input (19200 Baud)
PWM receive
VPW receive
wISO 9141-2
w omOutputs (0-5V levels)
.cSerial output (19200 Baud)
UPWM transmit bus+ (inverted)
t4PWM transmit bus- (inverted)
VPW transmit
eeISO 9141-2 L line transmit (inverted)
hISO 9141-2 K line transmit (inverted)
www.DataS1
1 page  
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 other control device
you may wish. If you are using the provided program, you need not read this section. Please note that in the
following discussion, all numerical values are in hexadecimal base unless otherwise mentioned.
GENERAL DISCUSSION OF COMMUNICATIONS
This is an overview of communications between the chip and the host computer or controller. There are
exceptions to these rules which are defined in the more detailed sections of this document. All
communications is via a simple 3 wire serial link. No handshaking is used. The chip listens for a message,
completes the task and then returns the results to the host. Then, it immediately waits for the next message.
The typical exchange to or from the chip is a series of bytes. The first byte is called the control byte. The
concept of the control byte is discussed here because it applies to many of the commands and responses
(but not all; exceptions are noted in the specific commands defined below). Normally, the control byte is
simply a number between 0 and 15 decimal (0-F hex) which indicates how many bytes follow this control
byte. For example, if three bytes are to be sent, the control byte would be 3 decimal (or 03 hex), then the
three bytes would follow; 03, byte1, byte2, byte3. This is the method used to ask the chip to retrieve a
particular item of vehicle OBD data, and it is the method used by the chip to return the Vehicles response to
the request message. Note that this only requires using the lower four bits of the control byte. The upper bits
are reserved for certain special commands and responses. These bits are used for the host computer to
make initial connection with the chip, to set the protocol to be used, and for the chip to return data indicating
success or failure. In particular, note that the chip will set the most significant bit of the control byte if the
action was not successful. If the operation was successful, the upper four bits of this control byte will be zero.
These special uses of the control byte are discussed below, and exceptions where the control byte is not
used are also indicated.
4
5 Page 
All other pins are not used. Normally, you do not need a shield,
so if present, the shield need not be connected.
It is recomended to keep the cable length 30 Ft or less,
but you may be able to make it longer, depending on the characteristics
of the cable and the serial port itself.
-------------- NOTES ON COMPONENTS ------------------------
Most of the resistors can be standard 5% carbon film.
There is one resistor (270 Ohms) which should be 1/2 watt.
If you only want to use this circuit with one or two types of protocols,
you can look at the schematic and omit any parts that are not needed.
For example, if you only wanted to use with VPW (Domestic General Motors),
you would only need 3 wires (pins 16,5 and 2) connected at the vehicle.
In this case, you could also omit several components from your circuit.
Here are some examples of parts that can be omitted.
If you don't use PWM, you can omit:
R4, R6, R7, R8, R9, R10, Q1, Q2, D1
If you don't use ISO, you can omit:
R15, R16, R17, R18, R19, R21, Q4, Q5
If you don't use VPW, you can omit:
R13, R14, R23, R24, D2, D3, Q3
The components used in the schematic are not critical.
Except for the pre programmed microcontroller and the crystal,
you can probably get all the parts from Radio Shack,
(They are usually available for less cost at electronics stores
or by mail order.)
You can use plain 5% tolerance carbon film resistors.
If you build this circuit on a piece of perfboard or a pc board
without an enclosure:
Take care that you don't lay it on a conducting surface,
causing it to short out. Your vehicle is pretty well protected,
but you could damage the interface circuit or keep it from operating.
Note that there is no reset button for the interface processor.
To reset just unplug from vehicle, then replug it to the vehicle.
(That will automatically reset the interface processor).
Then restart the PC's software program and reinitialize the interface.
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| PDF Descargar | [ Datasheet BR16F84-1.07.PDF ] | |
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