COM20020I3V-HD SMSC, COM20020I3V-HD Datasheet - Page 32

• Manufacturer Part Number: COM20020I3V-HD
• Description: Network Controller & Processor ICs ARCNET Contrllr
• Manufacturer: SMSC

Specifications of COM20020I3V-HD

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 5 Mbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 35 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

SMSC COM20020I 3.3V Rev.E
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
BIT
4,3
1,0
5
2
Transmit Enable
Extended
Timeout 1,2
Backplane
Sub Address 1,0
BIT NAME
TXEN
ET1, ET2
BACK-
PLANE
SUBAD
1,0
SYMBOL
When low, this bit disables transmissions by keeping
nPULSE1, nPULSE2 if in non-Backplane Mode, and nTXEN
pin inactive. When high, it enables the above signals to be
activated during transmissions. This bit defaults low upon
reset.
determined, and never disabled during normal operation.
Please refer to the Improved Diagnostics section for details on
evaluating network activity.
These bits allow the network to operate over longer distances
than the default maximum 2 miles by controlling the
Response, Idle, and Reconfiguration Times.
should be configured with the same timeout values for proper
network operation. For the COM20020I 3V with a 20 MHz
crystal oscillator, the bit combinations follow:
Note: These values are for 5Mbps and RCNTMR[1,0]=00.
Reconfiguration time is changed by the RCNTMR1 and
RCNTMR0 bits.
A logic "1" on this bit puts the device into Backplane Mode
signaling which is used for Open Drain and Differential Driver
interfaces.
These bits determine which register at address 07 may be
accessed. The combinations are as follows:
SUBAD1
See also the Sub Address Register.
DATASHEET
ET2
0
0
1
1
Page 32
0
0
1
1
This bit is typically enabled once the Node ID is
SUBAD0 Register
ET1
0
1
0
1
0
1
0
1
Tentative ID
Node ID
Setup 1
Next ID
DESCRIPTION
Response
Time (μS)
596.6
298.4
149.2
37.4
Idle Time
(μS)
656
328
164
41
Time (mS)
All nodes
Reconfig
840
840
840
Revision 09-11-06
420