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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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Si2457-D-FS18-EVB 데이터시트(PDF) 7 Page - Silicon Laboratories |
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Si2457-D-FS18-EVB 데이터시트(HTML) 7 Page - Silicon Laboratories |
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7 / 36 page  Si2493/57/34/15/04 Global ISOmodem-EVB Rev. 0.7 7 Figure 6. R106 Setup for Clock and Mode Configuration on DC with 24-Pin FT Package 1.3.2.1. 32 kHz Setup For 32 kHz, populate Y1 with the 32 kHZ crystal shown in the BOM and use 18 pF capacitors for the C40/C41 values. Also remove Y3 and Y1b if present and strap R101 to R106 as shown in Figure 5. The modem should then work as expected; no changes are needed on the motherboard 1.3.2.2. 4.9152 MHz For 4.9152 MHz, populate Y1b with the 4.9152 MHz crystal shown in the BOM and use 33 pF capacitors for the C40 and C41 values. Also remove Y3 and Y1 if present and strap R101 to R106 as shown in Figures 5 or 6 above.The modem should then work as expected; no changes are needed on the motherboard 1.3.2.3. 27 MHz For 27 MHz, populate Y3 with the small surface mount oscillator shown in the BOM and remove Y3 and Y1b if present. Also remove any capacitors at the C40 and C41 positions. Strap R101 to R106 as shown in Figures 5 or 6 above. The modem should then work as expected; no changes are needed on the motherboard 1.3.2.4. SPI Mode Setup To change to SPI mode setup it is necessary to configure the R101 straps as shown in Figure 5 or Figure 6, according to the package and clock used. Then setup the daughter card with neither UART nor USB operation selected, i.e. with no jumper on JP23. The SPI signals can then be obtained on J103, the system connector and connected to the host. Signal usage is described in Table 2. 1.3.3. Parallel Bus Mode Setup To change to parallel bus mode setup it is necessary to configure the R101 straps as shown in Figure 5 or Figure 6, according to the package and clock used. Then setup the daughter card with neither UART nor USB operation selected, i.e. with no jumper on JP23. The SPI signals can then be obtained on J103, the system connector and connected to the host. See the data sheet and schematic for signal and pin usage. 1.4. Power Requirements The Si2493/57/34/15/04-EVB has an on-board diode bridge, filter capacitor, and voltage regulator (U10 and U18). Power can be supplied from any source capable of providing 7.5 V–13 V dc or 7.5 V–13 V peak ac and at least 100 mA. (Additional current may be required if a speaker is connected for monitoring call progress tones.) Power may be applied to the Si2493/57/34/15/ 04-EVB through the screw terminals (J8), the 2 mm power jack (J9), or the USB cable (even if the modem is configured for RS-232 operation). The onboard full- wave rectifier and filter ensure the correct polarity is applied to the Si2493/57/34/15/04-EVB. Daughter card current can be measured by connecting a DVM across R59, a 1 resistor using the supplied test points on Table 2. Signal Usage SPI Function JP23 Pin Number Legacy Pin Function SPI_CSb 5 RTSb SPI_MISO 7 RXD SPI_MOSI 9 TXD SPI_SCLK 11 CTSb |
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