SAE-J1850 Multiplex Communication Protocol Conformity
Transmission Controller for Automotive LAN
Documents
| » PDF of this Data Sheet (103 KB) is
available. |
msm6636b.pdf
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THOMAS is a LAN monitor system for a serial communication
multiplex bus. THOMAS
Manual |
Description
The
MSM6636B is a transmission controller for automotive LAN based on data
communication protocol SAE-J1850. This device can realize a data bus topology
bus LAN system with a PWM bit encoding method (41.6 kbps). In addition to a
protocol control circuit, MSM6636B has an enclosed quartz oscillation circuit,
host CPU interface (parallel interface), a transmit / receive buffer, and a bus
receiver circuit that decreases the burden on the host CPU.
Features
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Based on SAE-J1850 CLASS B DATA COMMUNICATION NETWORK
INTERFACE (issued August 12, 1991) |
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Non-destructive collision and priority control using CSMA / CD
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Internal transmit buffer (1 frame) and receive buffer (2
frames) |
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Modulating/demodulating: PWM (Pulse Width Modulation)
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Transmission speed: 41.6 kbps |
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Multi-address setting with physical addressing: 1 type /
functional addressing: 15 types |
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Address filter function by multi-addressing (broadcasting
possible) |
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Automatic retransmission function by arbitration loss and non
ACK |
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Three types of in-frame response support:
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Single-byte response from a single node |
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Multi-byte response from a single node (with CRC code)
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Single-byte response from multiple nodes (ID response as ACK)
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Error detection by cyclic redundancy check (CRC) |
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Various communication error detections |
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Dual-wire bus abnormality detection by internal bus receiver
and fault tolerance function |
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Host CPU interface is accessed in parallel |
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Sleep function
Low current consumption mode by oscillation
stop (IDS Max < 50µA) SLEEP / WAKE UP control from host CPU, WAKE UP via LAN
bus |
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Package:
24-pin plastic SOP (SOP24-P-430-1.27-K) (Product
name : MSM6636BGS-K) |
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