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Revision 03-08-07
Page 2
SMSC COM20022I 3.3V Rev.C
PRODUCT PREVIEW
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
General Description
SMSC's COM20022I 3V is a member of the family of Embedded ARCNET Controllers from Standard
Microsystems Corporation. The device is a general purpose communications controller for networking
microcontrollers and intelligent peripherals in industrial and embedded control environments using an
ARCNET protocol engine. The small 48 pin package, flexible microcontroller and media interfaces, eight-
page message support, and extended temperature range of the COM20022I 3V make it the only true
network controller optimized for use in industrial and embedded applications. Using an ARCNET protocol
engine is the ideal solution for embedded control applications because it provides a deterministic token-
passing protocol, a highly reliable and proven networking scheme, and a data rate of up to 10 Mbps when
using the COM20022I 3V. A token-passing protocol provides predictable response times because each
network event occurs within a predetermined time interval, based upon the number of nodes on the
network. The deterministic nature of ARCNET is essential in real time applications. The integration of the
2Kx8 RAM buffer on-chip, the Command Chaining feature, the 10 Mbps maximum data rate, and the
internal diagnostics make the COM20022I 3V the highest performance embedded communications device
available. With only one COM20022I 3V and one microcontroller, a complete communications node may
be implemented.
NOTE:
For more details on the ARCNET protocol engine and traditional dipulse signaling schemes, please
refer to the ARCNET Local Area Network Standard, or the ARCNET Designer's Handbook, available
from Datapoint Corporation.
SMSC COM20022I 3.3V Rev.C
Page 3
Revision 03-08-07
PRODUCT PREVIEW
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
Block Diagram
Figure 1
- Internal Block Diagram
Revision 03-08-07
Page 4
SMSC COM20022I 3.3V Rev.C
PRODUCT PREVIEW
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
Package Outline
Figure 2 - 48 Pin TQFP Package Outline
Table 1 - 48 Pin TQFP Package Parameters
A
A1
A2
D
D/2
D1
E
E/2
E1
H
L
L1
e
θ
W
R1
R2
ccc
Notes:
1)
2)
3)
4)
5)
Controlling Unit: millimeter
Tolerance on the position of the leads is ± 0.04 mm maximum.
Package body dimensions D1 and E1 do not include the mold protrusion. Maximum mold protrusion is 0.25 mm.
Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane is 0.78-1.08 mm.
Details of pin 1 identifier are optional but must be located within the zone indicated.
目前医疗监护中无法动态掌握患者信息，一旦患者病情恶化，无法在第一时间实施抢救，对数据信息维护效率低。 文中首先阐述了蓝牙技术及其在医疗监护中应用的可行性，然后设计了系统框架，给出了具体功能，BlueTooth Wireless Communication Technology Application in Medical Monitoring包括数据采集和语音报警，最后对蓝牙信号在传输...[详细]
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