Dear customers,
About the change in the name such as "Oki Electric Industry Co. Ltd." and
"OKI" in documents to OKI Semiconductor Co., Ltd.
The semiconductor business of Oki Electric Industry Co., Ltd. was succeeded to OKI
Semiconductor Co., Ltd. on October 1, 2008.
Therefore, please accept that although
the terms and marks of "Oki Electric Industry Co., Ltd.", “Oki Electric”, and "OKI"
remain in the documents, they all have been changed to "OKI Semiconductor Co., Ltd.".
It is a change of the company name, the company trademark, and the logo, etc. , and
NOT a content change in documents.
October 1, 2008
OKI Semiconductor Co., Ltd.
550-1 Higashiasakawa-cho, Hachioji-shi, Tokyo 193-8550, Japan
http://www.okisemi.com/en/
¡ Semiconductor
MSM6636
¡ Semiconductor
MSM6636
SAE-J1850 Communication Protocol Conformity Transmission Controller for Automo-
tive LAN
GENERAL DESCRIPTION
The MSM6636 is a transmission controller for automotive LAN based on data communication
protocol SAE-J1850. This LSI can realize a data bus topology bus LAN system with a PWM bit
encoding method (41.6 K bps). In addition to a protocol control circuit, MSM6636 has an enclosed
quartz oscillation circuit, host CPU interface (clock synchronous serial / UART), a transmit/
receive buffer, and a bus receiver circuit that decreases the burden on the host CPU.
FEATURES
• Based on SAE-J1850 CLASS B DATA COMMUNICATION NETWORK INTERFACE (issued
August 12, 1991)
• CSMA/CD (Carrier-sense multiple access with collision detection)
• Internal transmit buffer (1 frame) and receive buffer (2 frames)
• Bit encoding: PWM (Pulse Width Modulation)
• Transmission Speed: 41.6K bps
• Multi-address setting with physical addressing: 1 type / functional addressing: 15 types
• Address filter function by multi-addressing (broadcasting possible)
• Automatic retransmission function by arbitration loss and non ACK
• 3 types of in-frame response support:
q
Single-byte response from a single recipient
w
Multi-byte response from a single recipient (with CRC code)
e
Single-byte response from multiple recipients (ID response as ACK)
• Error detection by cyclic redundancy check (CRC)
• Various communication error detections
• Dual-wire bus abnormality detection by internal bus receiver and fault tolerance function
• Host CPU interface is LSB first / serial, 4 modes supported
q
Clock synchronous serial (no parity)
Normal mode: 8-bit data
MPC Mode:
8-bit data + MPC bit (1: address / 0: data select bit)
w
UART (yes/no parity selectable)
Normal mode: 1 start bit + 8-bit data + (parity) + 1 stop bit
MPC mode:
1 start bit + 8-bit data + MPC bit + (parity) + 1 stop bit
• Sleep Function
Low current consumption mode by oscillation stop (IDS Max < 50µA)
SLEEP / WAKE UP control from host CPU, WAKE UP via LAN bus
• Available package 18pin DIP, 18 pin QFJ (PLCC) and 24pin SOP.
1
MSM6636
¡ Semiconductor
BLOCK DIAGRAM
Buffer Register
Receive
Register
Serial Interface
Receive
Buffer
S-P
Converter
CRC
Checker
LAN Controller
PWM
Decoder
Degital
Filter
Bus
Receiver
LAN
Bus
Input
Address Register
Address
Filter
Receive Controller
CPU
Status Register
Transmission Register
CRC
Generator
P-S
Converter
Transmission Controller
Response Register
x'tal
Clock
Generator
PWM
Encoder
LAN
Bus
Output
MSM6636
2
¡ Semiconductor
MSM6636
PIN CONFIGURATION (TOP VIEW)
18pin Plastic DIP
AVDD
1
BO–
BI–
BI+
BO+
2
3
4
5
1 8
1 7
1 6
1 5
1 4
1 3
1 2
11
10
18pin Plastic QFJ
BO–
AVDD
DVDD
RES
DVDD
RES
INT
TXD
RXD
SCLK
/PAE
A-D
OSC0
M-N
DGND
OSC1
OSC0
OSC1
8
9
10 11
24pin Plastic SOP
AVDD
BO–
BI–
BI+
BO+
NC
NC
NC
AGND
U-C
M-N
DGND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
2
1
18 17
16
15
14
13
12
BI–
BI+
BO+
AGND
U-C
3
4
5
6
7
INT
TXD
RXD
SCLK
/PAE
A-D
AGND
6
U-C
M-N
7
8
DVDD
RES
INT
TXD
RXD
NC
NC
NC
SCLK/PAE
A-D
OSC0
OSC1
DGND
9
NC: No Connection
PIN DESCRIPTION
Pin #
Pin Name
AVDD
BO –
BI –
BI +
BO +
AGND
U-C
M-N
DGND
OSC 1
OSC 0
A-D
SCLK / PAE
RXD
TXD
INT
RES
DVDD
DIP/
QFJ
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
SOP
1
2
3
4
5
9
10
11
12
13
14
15
16
20
21
22
23
24
I/O
—
O
I
I
O
—
I
I
—
O
I
I
I
I
O
O
I
—
Function
Analog power supply pin
LAN - BUS output –
LAN - BUS input –
LAN - BUS input +
LAN - BUS output +
Analog ground pin
0: UART
1: clock synchronous serial select pin
1:normal mode select pin
0: MPC mode
Digital ground pin
Crystal oscillation output
Crystal oscillation input
0: data communication
1: address communication
Serial clock input/Parity select pin
Serial data input pin
Serial data output pin
Interrupt output pin
Reset input pin
Digital power supply pin
3
MSM6636
¡ Semiconductor
ABSOLUTE MAXIMUM RATINGS
DGND = AGND = 0V
Parameter
Power Supply Voltage
Input Voltage
Output Voltage
Power Dissipation
Storage Temperature
Symbol
DVDD, AVDD
V
I
V
O
P
D(DIP)
*
1
P
D(QFJ)
*
2
P
D(SOP)
*
3
T
STG
AVDD = DVDD
AVDD = DVDD
Ta = 25°C
Ta = 25°C
Ta = 25°C
Condition
Rated Value
-0.3~7.0
-0.3~DVDD+0.3
-0.3~DVDD+0.3
860
960
830
-55~150
Unit
V
V
V
mW
mW
mW
°C
P
D(DIP)*1
: 18PIN DIP package power dissipation
P
D(QFJ)*2
: 18PIN QFJ package power dissipation
P
D(SOP)*3
: 24PIN SOP package power dissipation
Power Dissipation Curve
< 18PIN DIP package >
1000
860
Power dissipation P
D(QFJ)
[mW]
Power dissipation P
D(DIP)
[mW]
1000
960
< 18PIN QFJ package >
500
500
-40 25
125 150
-40 25
125 150
Ambient temperature Ta (°C)
< 24PIN SOP package >
Ambient temperature Ta (°C)
Power dissipation P
D(SOP)
[mW]
1000
830
500
-40 25
125 150
Ambient temperature Ta (°C)
4
