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CR0603-16W-56R2F Datasheet(PDF) 4 Page - Silicon Laboratories |
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CR0603-16W-56R2F Datasheet(HTML) 4 Page - Silicon Laboratories |
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4 / 36 page  Si2493/57/34/15/04 Global ISOmodem-EVB 4 Rev. 0.7 1.3.1.1. RS232 vs USB vs User Provided IO Selection To change to USB operation simply move the RS232 selection jumper on JP23 to the USB position as marked on the PCB and shown in Figure 1. When the USB vs UART settings are changed the appropriate indicator LED will light up on the EVB. If neither jumper is in place then neither serial port will be activated and the user must provide I/O signals via the pins on J103. This IO can be in ASYNCH SERIAL, SPI SERIAL and Parallel Bus mode. 1.3.1.2. Autobaud Control Autobaud is enabled with no jumper at the JP34 position. When a jumper is in place, autobaud is disabled and the user must setup the host to run 19k2 baud in order to use the modem. 1.3.1.3. EEPROM Control To enable the EEPROM (U5) both jumpers JP34 and JP35 must be in place and the modem reset. JP35 physically connects the EEPROM chips select line to the modem and allows the EEPROM to function when addressed by the modem, while JP34 connects a strapping option to the correct modem pin which is sensed during reset and instructs the modem firmware to use the EEPROM. 1.3.1.4. Call Progress Configuration The modem call establishment can be heard by enabling the call progress feature via software (see AN93) and Hardware. The hardware components include installing JP12 which enabled the audio power amplifier and installing JP14 to connect the on board speaker to the power amplifier output. If an offboard speaker is to be used then JP14 can be removed and the alternate speaker can be connected to pins 1 and 4 of JP11. Note the this audio output is 8 and differential so that neither output pin should be grounded. 1.3.1.5. Control Line Configuration Various modem control lines can be rearranged depending on the user preferences and the specific modem chips used. This is done using JP6. The basic two JP6 configurations are shown in the following figures. Figure 2. Default J6 Setup for 24-Pin Modem Chips Figure 3. Default J6 Setup for 16-Pin Modem Chips The specific details of what the jumpers connect are shown in Table 1, which is also found printed on the underside of the EVB. J6 1 4 7 10 13 3 6 9 12 15 J6 1 4 7 10 13 3 6 9 12 15 Table 1. Routing of Control Signals with Jumper Position on J6 RS232 Signal Si24xx 24-Pin Si24xx 16-Pin Si2401 Left Right Left Right Left Right DCD DCD SDI/EESD DCD NC DCD NC RI RI FSYNCH NC RI NC RI DTR ESC RI ESC NC ESC NC RTS RTS SDO/ EECLK NC RTS NC GPIO1 DSR INT AOUT/INT NC INT NC AOUT/INT |
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