SJA1000 NXP Semiconductors, SJA1000 Datasheet - Page 46

• Manufacturer Part Number: SJA1000
• Manufacturer: NXP Semiconductors

Specifications of SJA1000

• Data Rate: 1000Kbps
• Number Of Transceivers: 1
• Power Down Mode: Sleep
• Standard Supported: CAN 2.0B
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Package Type: PDIP
• Supply Current: 15mA
• Operating Temperature (max): 125C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Mounting: Through Hole
• Pin Count: 28
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
6.4.15.2
In this filter configuration two short filters can be defined.
A received message is compared with both filters to
decide, whether this message should be copied into the
receive buffer or not. If at least one of the filters signals an
acceptance, the received message becomes valid. The bit
correspondences between the filter bytes and the
message bytes depends on the currently received frame
format.
Standard frame: if a standard frame message is received,
the two defined filters are looking different. The first filter
compares the complete standard identifier including the
RTR bit and the first data byte of the message. The second
filter just compares the complete standard identifier
including the RTR bit.
2000 Jan 04
handbook, full pagewidth
Stand-alone CAN controller
Dual filter configuration
MSB
message bit
acceptance code bit
acceptance mask bit
CAN ADDRESS 16; ACR0
7
CAN ADDRESS 20; AMR0
7 6 5 4 3 2 1 0
6 5 4 3 2 1 0
Fig.10 Single filter configuration, receiving extended frame messages.
LSB
MSB
CAN ADDRESS 21; AMR1
CAN ADDRESS 17; ACR1
7
7 6 5 4 3 2 1 0
1
6 5 4 3
2 1 0
1
LSB
46
MSB
CAN ADDRESS 22; AMR2
CAN ADDRESS 18; ACR2
7
7 6 5 4 3 2 1 0
For a successful reception of a message, all single bit
comparisons of at least one complete filter have to signal
acceptance. In case of a set RTR bit or a data length code
of logic 0 no data byte is existing. Nevertheless a message
may pass filter 1, if the first part up to the RTR bit signals
acceptance.
If no data byte filtering is required for filter 1, the four least
significant bits of AMR1 and AMR3 have to be set to
logic 1 (don’t care). Then both filters are working
identically using the standard identifier range including the
RTR bit.
6 5 4 3 2 1 0
&
logic 1 = accepted
logic 0 = not accepted
LSB
ACR = Acceptance Code Register
AMR = Acceptance Mask Register
MSB
CAN ADDRESS 19; ACR3
CAN ADDRESS 23; AMR3
7
7 6 5 4 3 2 1 0
6 5 4 3 2 1 0
MGK625
Product specification
unused
unused
LSB
SJA1000