COM20019I-HT Standard Microsystems (SMSC), COM20019I-HT Datasheet - Page 70

• Manufacturer Part Number: COM20019I-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of COM20019I-HT

• Number Of Transceivers: 1
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Chapter 12
12.1
In order to properly write software to work with the COM20019I 3V Rev B and C it is necessary to be able to identify the
different revisions of the part.
To identify the COM20019I 3V Revision follow the following procedure:
Rev. 11-07-08
* If the value read from Register-5 is 0x80 then the part is a COM20019I 3V Rev B
* If the value read from Register-5 is 0xC0 then the part is a COM20019I 3V Rev C
1.
2.
3.
4.
Write 0x00 to Register-5
Read Register-5
Write 0xC0 to Register-5
Read Register-5*
Software Identification of the COM20019I 3V Rev B and Rev C
The value read from Register-5 must be 0x00.
Appendix C
DATASHEET
Page 70
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
SMSC COM20019I 3.3V Rev.C