Si2439-A-FM18-EVB Silicon Labs, Si2439-A-FM18-EVB Datasheet - Page 7

• Manufacturer Part Number: Si2439-A-FM18-EVB
• Description: Networking Development Tools 38pin Si2439+ Si3018 ISOmodem Eval Board
• Manufacturer: Silicon Labs
• Type: Network Controller & Processorr

Specifications of Si2439-A-FM18-EVB

• Rohs: yes
• Tool Is For Evaluation Of: Si2439
• Data Rate: 56 Kbps
• Interface Type: RJ-11, RS-232, SPI, UART, USB
• Operating Supply Voltage: 3.3 V

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.
Figure 6. R106 Setup for Clock and Mode Configuration on DC with 24-Pin FT Package
Rev. 0.7
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
G l o b a l I S O m o d e m - E V B
SPI Function
SPI_MISO
SPI_MOSI
SPI_SCLK
SPI_CSb
Si2493/57/34/15/04
Table 2. Signal Usage
JP23 Pin Number
11
5
7
9
Legacy Pin
Function
RTSb
CTSb
RXD
TXD
7