COM20022ITQFP SMSC, COM20022ITQFP Datasheet - Page 69

• Manufacturer Part Number: COM20022ITQFP
• Description: Network Controller & Processor ICs ARCNET Contrllr
• Manufacturer: SMSC

Specifications of COM20022ITQFP

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 10 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current (max): 65 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 12
12.1
In order to properly write software to work with the COM20020I 3V Rev D and E it is necessary to be able to identify
the different revisions of the part.
To identify the COM20020I 3V Revision follow the following procedure:
SMSC COM20020I 3.3V Rev.E
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
* If the value read from Register-5 is 0x80 then the part is a COM20020I 3V Rev D
* If the value read from Register-5 is 0xC0 then the part is a COM20020I 3V Rev E
1.
2.
3.
4.
Write 0x00 to Register-5
Read Register-5
Write 0xC0 to Register-5
Read Register-5*
Software Identification of the COM20020I 3V Rev D and Rev E
The value read from Register-5 must be 0x00.
Appendix C
DATASHEET
Page 69
Revision 09-11-06