co561ad-s Connect One Ltd., co561ad-s Datasheet - Page 30

• Manufacturer Part Number: co561ad-s
• Description: The Co561ad-s, Ichip? Internet Controller?, Is Part Of A Family Of Intelligent Peripheral Devices That Provide Internet Connectivity Solutions To A Myriad Of Embedded Devices.
• Manufacturer: Connect One Ltd.

11-3500-00
7 iChip Designs
7.1 Serial Modem Environment
7.2 Selecting a Crystal
The characteristics of the built-in inverting amplifier set limits on the following
parameters for crystals:
Crystal first overtone frequency .................. 18.432 MHz
ESR (Equivalent Series Resistance) ............ 40 Ω max
Drive Level ............................................….. 1 mW max
Frequency tolerance ……………………………… +/- 100ppm
Load capacitance………………………………….. 18pF
Shunt capacitance…………………………………. 7pF Maximum
The recommended range of values for C 1 and C 2 are as follows:
C 1 ............................................................... 15 pF ± 20%
C 2 ............................................................... 22 pF ± 20%
The specific values for C1 and C2 must be determined by the designer and are dependent
on the characteristics of the chosen crystal and board design.
iChip CO561AD-S Datasheet
CPU (Host)
Embedded
Figure 7-1 Serial Modem Environment
C1
C2
Serial
Figure 7-2 Selecting a Crystal
Crystal
iChip
X1
X2
Serial
Modem
Data
Line
iChip Designs
7-1