Manual Tecnico Automotriz

Features
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Compatible with EOBD/OBDII standard
2.7 to 6V operating range
Direct LED drive for status display
ISO9141
KWP2000
J1850
CAN Bus
KW71,81,82,1281
Multiple response from multiple ECU
Physical and fonctional addressing
Discret or transceiver chip select

EOBD/OBDII to
RS232 gateway

OE90C4000

Description

CLKOUT

DOWNL

TXK

2827

26

GND
2

NC

VCC
3

1

RXCAN
4

OBDII is an international standard for
communication between automobiles and
diagnostic testers.it specifies a serial data
communication bus between ECUs and diagnostic
test SAE OBDII Scan Tool ( SAE j1978 ).
The OE90C4000 provides an inteligent interface
between a Host and the vehicle’s Electronic
control units. Both LEDs display thecurrent
communication status and connected information.
OE90C4000 is developed to meet first the ISO
15031-5 standard with ISO9141,KWP2000,SAE
j1850 and CAN Bus protocols but car specific
protocols KW71 and KW1281 are implemented.

RXCAN

5

25

RXVPWM

LED 1

6

24

TXVPWM

TXPWM-

7

23

TXL

TXPWM+

8

22

RXK

PLCC-28

17

18

VCC

GND

RESET16

19

XTAL1

11

VPWM_DC

15

LED2

XTAL2

20
14

10

RXD

ISO_DC

13

NC

TXD

21

12

9

RXPWM

BAUDIN

1

Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

Pin Name
NC
GND
VCC
RXCAN
TXCAN
LED1
TXPWMTXPWM+
BAUDIN
ISO_DC
VPWM_DC
RXPWM
TXD
RXD
XTAL2
XTAL1
VCC
GND
RESET

Type

20
21
2223
24
25
26
27

LED2
NC
RXK
TXL
TXVPWM
RXVPWM
TxK
DOWNLD

O

28

CLKOUT

O

I
O
O
O
O
I
I
I
O
I
I
I
I
I/O

I
O
O
I
O
I

Description
Ground
Supply voltage
CAN BUS input
CAN BUS output
OK LED max 5 mA for low current LED
Transmit (-) output for PWM signal
Transmit (+) output for PWM signal
16 x RS232 Baudrate input clock
ISO discret / chip selectinput 1=discret
VPWM discret chip select input 1= discret
PWM input
RS232 output
RS232 input
16 Mhz crystal input
16 MHz crystal input
Supply voltage
Ground
A high level on this pin during 2 machine cycles
while the oscillator is running resets the device.
LED output to indicate the frames exchange
ISO K-line input
ISO L-Line output
VPWM transmit output
VPWM receive input
ISOK-Line output
A low on this pin puts the device in download
mode
Clock output for RS232 baud rate in

2

Application notes

VCC
VCC
D1

11
10

C1
10uF

1
3
4
5
2
6

+

1
6
2
7
3
8
4
9
5

T1OUT
T2OUT

T1IN
T2IN
C1+
C1C2+
C2V+
V-

R1OUT
R2OUT

+

C3
10uF

U1

12
9

13
14
10
11

14
7

1
21
4
5

MAX232

C4
10uF

RXCAN
TXCAN+

VCC

C5
27pF

D2

GREEN

LED1
TXD
LED2
RXD
ISO_DC
VPWM_DC CLKOUT
BAUDIN

15

+ C2
10uF

DB9

R1IN
R2IN

GND

13
8

P1

VCC

16

U4

15

Y1
16M
C6
27pF

16
19
3
17
C7
1uF

NC
NC
RXCAN
TXCAN

XTAL2

TXPWMTXPWM+
TXK
RXK
TXL
RXPWM
TXVPWM
RXVPWM
DOWNLD
GND
GND

XTAL1

6
20
28

R2
270

9
7
8
26
22
23
12
24
25YELLOW

R1
270

TXK
RXK
TXL

TXPWM(-)
TXPWM(-)

RXPWM
TXVPWM
RXVPWM

27
2
18

JP1
DJMP

RST
VCC
VCC

OE90C2000

+

VCC

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it is recommended to use a brown out device ( e.g TL7705 from TI ).
the both LEDs are low current If < 5 mA.
close jumper to download a new release.
Don’t change the value of crystal.
LED yellow indicates everytime a frameexchange occurs. LED green is on
if a valid protocol is found.

3

8V

8V

VBAT

1k1

3k
JP2

8
3+

TXVPWM

LM393
1

2-

2N3906

4

3k9

4k7

1N4148

2
4
6
8
10
12
14
16

1
3
5
7
9
11
13
15

OBD CONNECTOR
LM393
7

-

RXVPWM

6

10k

5

10k

+

VBAT

GND

LM7805C/TO220
3
1
OUT IN

VCC

100nF

2

100nF...