COM20020I-DZD-TR SMSC, COM20020I-DZD-TR Datasheet - Page 72

• Manufacturer Part Number: COM20020I-DZD-TR
• Description: Network Controller & Processor ICs 5Mbps ARCNET CTRL 2K x 8 ON-CHIP RAM
• Manufacturer: SMSC

Specifications of COM20020I-DZD-TR

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 5 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current (max): 40 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Appendix C - Software Identification of the
Revision 12-05-06
In order to properly write software to work with the COM20020 Rev B, C and D it is necessary to be able to
identify the different revisions of the part.
To identify the COM20020 Revision follow the following procedure:
1.
2.
3.
* If the value read from Register-6 is 0x98 then the part is a COM20020 Rev B or earlier
* If the value read from Register-6 is 0x9A then go to next step below
4.
5.
* If the value read from Register-5 is 0x00 then the part is a COM20020 Rev C
* If the value read from Register-5 is 0x80 then the part is a COM20020 Rev D
Write 0x98 to Register-6 (Address = 6)
Write 0x02 to Register-5 (Address = 5)
Read Register-6
Write 0x80 to Register-5
Read Register-5
COM20020 Rev B, Rev C and Rev D
DATASHEET
Page 72
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
SMSC COM20020I Rev D
Datasheet