CR2010-2W-2491F データシートの表示（PDF） - Silicon Laboratories

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CR2010-2W-2491F

Global ISOmodem-EVB

Silicon Laboratories 

Si2493/57/34/15/04

Global ISOmodem-EVB

1.3.2. Daughter Card Configuration

The daughter card comes configured with either a 24-

pin FT or 16-pin FS system side part and either 32 kHz

or 4.9152 MHz operation, and UART operation. The

daughter card can also be setup to operate with a third

clock frequency, an on board 27 MHz oscillator. To

change between these options requires component

changes on the daughter card.

The daughter card can also operate in three possible

interface modes: parallel bus mode, in SPI mode as well

as the default UART mode.

There are six small (0402) strapping resistors (R101 to

R106) that are on the daughter card and are configured

differently depending on the combination of chip

package, clock frequency chosen, and interface mode.

See Figures 5 and 6 for details.

The card and its options are shown in Figure 4, which

shows the Modem Daughter card Rev 2.0 top and

bottom views with the critical parts that may be changed

to select another command mode (i.e. SPI) or an

alternate crystal frequency, such as 4.9152 MHz.

Rev. 0.7

5

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