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rev. 0.7 3/06 copyright ? 2006 by silicon laboratories SI2400URT-EVB SI2400URT-EVB e valuation b oard f or the si2400 with a uart i nterface description the SI2400URT-EVB evaluati on board provides the system designer an easy way to evaluate the si2400 isomodem ? . the SI2400URT-EVB consists of a motherboard and power supply, an rs-232 interface and usb, other ease-of-use features, and a complete, removable modem module on a daughter card. (a functional block diagram of the SI2400URT-EVB is shown below.) the si2400 isomodem is a complete controller-based modem chipset with an integrated and programmable direct access arrangement (daa) that meets global telephone line requirements. available as two 16-pin small outline (soic) packages, the si2400 isomodem eliminates the need for a separate dsp data pump, modem controller, memories, analog front end (afe), isolation transformer, relays, opto-isolators, and a 2- to 4-wire hybrid. the si2400 is ideal for embedded modem applications due to its small board area, controller-based architecture, low power consumption, and global compliance. the si2400urt- evb provides an rj-11 jack and a db9 connector for interfacing the SI2400URT-EVB to the phone line and a pc or data terminal serial port. this allows the si2400 isomodem to operate as a serial modem for straightforward evaluation. to evaluate the si2400 isomodem in an embedded system, the daughter card can be used independently or with the motherboard. a direct access header (jp3) is available on the motherboard to bypass the rs-232 transceivers and connect the si2400 isomodem directly to a target system. the evb also provides test points for access to the analog input and analog output. these interfaces can be used to evaluate the si2400 pcm and voice modes. given that any of the gpio pins may be used as an audio input, the evb provides access to all gpio pins. power is supplied through a screw terminal (j3) or a standard 2 mm power jack (j4). an onboard rectifier, filter, and voltage regulator allow the power input to be 7.5?13 v ac or dc (either polarity). alternatively, power can be supplied through the usb interface (whether or not the usb interface is used). the SI2400URT-EVB can drive an external speaker for call monitoring, or a piezoelectric speaker can be mounted directly on the board in the space provided. features the SI2400URT-EVB includes the following: dual rj-11 connection to phone line rs232 and usb interface to pc audio connector for call monitoring direct access to si2400 for embedded application evaluation easy power connection to common 7.5?13.5 v power supplies 9 v ac adaptor simple installation and operation functional block diagram rectifier filter 7.5?13.5 v dc or peak ac rs-232 transceivers uart db9 interface selection jumpers si2400 push button reset reset xtali xtalo si3015 interface circuit rj-11 phone line audio amplifier aout audio out direct access hdr daughter board boundary voltage regulator 3.3 v 5 v power-on reset 9 v dc at 300 ma ac adaptor usb connector usb i/p
SI2400URT-EVB 2 rev. 0.7 1. introduction notable differences between the si2400 and other isomodem products are highlighted in the bulleted list below. for complete details and specifications, please refer to the current si2400 data sheet. unique si2400 features: many at commands execute when entered without . at commands must be entered in uppercase. the +++ escape sequence is disabled at power-up and/or reset. ats14=20 enables +++ escape. s-register address and value are entered in hex (example: ats0f=2b) result codes are abbreviated (example: ?o? instead of ?ok?). the si2400dc power can be 3.3 v or 5 v (3.3 v used on motherboard). several at commands are required to enable the speaker. atsf4=00 removes tx and rx audio mute. atse4=02 turns on adc and dac power. atm2 turns on speaker continuously. dte interface default is 8n1, 2400 bps, no handshaking, and no linefeeds with carriage returns. atdt is disabled if linefeeds with carriage returns are enabled. some common at commands are not available: ath1 a/ atd (must be atdt or atdp) at&tn (use atse4=20 for local digital loopback) 2. SI2400URT-EVB setup and evaluation this section explains how to set up the SI2400URT-EVB for evaluation as an rs-232 or usb interface modem. jumper settings, power connection, pc/terminal connections, and terminal program configuration settings are given. after power is applied, initial modem setup instructions and a basic tutorial on modem operation are provided. si 2400urt-evb configurations for evaluating additional features are discussed separately. 2.1. SI2400URT-EVB quick start?rs-232 interface 1. set jumpers according to figure 1. 2. connect: db-9 to pc com 1 (with a pass-through cable). rj-11 to phone line or test box. the 9 v ac adaptor (or usb cable). 3. bring up: turn on power to modem. set terminal program for 2400 bps 8n1. hardware flow control. disable linefeeds with carriage returns (linefeeds with carriage returns disable atdt commands). 4. type ?at? followed by a carriage return. should echo ?at? and then an ?o?. 5. type: ats14 = 20 to enable +++ escape. ats07 = 06 to enable v.22b. ats00 = 01 for auto-answer on first ring. table 1. modem configuration examples modulation ats07 = v22bis 06 v.22 02 v.21 03 bell 212a 00 bell 103 01 v.23 (1200 tx, 75 rx?answer) 14 v.23 (75 tx, 1200 rx?originate) 24 v.23 (600 tx, 75 rx?answer) 10 v.23 (75 tx, 600 rx?originate) 20 table 2. modem initialization example command function ats00=02 auto-answer after two rings ats07=06 configures modem for v.22b ats14=20 enables +++ escape atsf4=00 removes audio mute atse4=02 turns on audio adc and dac atm1 turns on speaker until carrier negotiated
SI2400URT-EVB rev. 0.7 3 2.2. SI2400URT-EVB quick start?usb interface 1. set jumpers according to figure 2. 2. connect: usb cable to pc. rj-11 to phone line or test box. 3. download usb driver for your operating system from the cd supplied with the evaluation board. 4. install driver. 5. bring up: reset the modem. set terminal program for 2400 bps 8n1. hardware flow control. disable linefeeds with carriage returns (linefeed s with carriage returns disable atdt commands). 6. type ?at? followed by a carriage return. should echo ?at? and then an ?o?. 7. type: ats14=20 to enable +++ escape. ats07=06 to enable v.22b. ats00=01 for auto-answer on first ring. 2.3. jumper settings check all jumper settings on the SI2400URT-EVB before applying power. figure 1 shows the standard factory jumper settings. these settings configure the SI2400URT-EVB for rs-232 se rial operation. any standard terminal program configured to communicate through a pc com port can be used to communicate with the SI2400URT-EVB. to connect the modem directly into an embedded system with lvcmos/ttl levels, install jp8 to disable both the rs-232 and usb interfaces. connection to the embedded system can be made to jp-3. place a jumper on jp13 to enable the onboard speaker, ls1. figure 1. jumper settings?rs-232 interface (outlined in gray)
SI2400URT-EVB 4 rev. 0.7 figure 2. jumper settings?usb interface (outlined in gray) 2.4. power requirements the SI2400URT-EVB has an onboard diode bridge, filter capacitor, and voltage regulator. power can be supplied from any source capable of providing 7.5?13 v dc or 7.5?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 SI2400URT-EVB through the screw terminals (j3) or the 2 mm power jack (j4). the onboard full-wave rectifier and filter ensure that the correct polarity is applied to the SI2400URT-EVB. daughter card power is supplied through voltage regulator u2 and is factory set at 3.3 v. power is also supplied by the usb cable and can be used regardless of whether the modem is configured for usb, rs-232, or direct interface mode. daughter card current can be measured by connecting an ammeter between jp7 pins 1 and 2. these pins must always be connected. failure to connect pins 1 and 2 of jp7 through either a jumper or a low- impedance ammeter may result in damage to the SI2400URT-EVB. 2.5. terminal an d line connections the si2400 can be tested as a standard serial data modem by connecting the SI2400URT-EVB to a personal computer or other data terminal equipment (dte), phone line, and power. connect a pc, rs-232, or usb interface to the SI2400URT-EVB with the appropriate cable. the rs-232 transceivers on the evb can communicate with the dte at rates of up to 1 mbps. any standard terminal program, such as hyperterminal or procomm, running on a pc can communicate with the SI2400URT-EVB. configure the term inal emulation program to 2400 bps, 8 data bits, no parity, one stop bit, and hardware flow control. also, be sure to disable linefeeds with carriage return s. connect the rj-11 jack on the SI2400URT-EVB to an analog phone line or telephone line simulator, such as a teltone tls 5. 2.6. making connections with the terminal program properly configured and running, apply power to the SI2400URT-EVB. type ?at?, and the modem should return ?o?, indicating the modem is working in the command mode and communicating with the terminal. if the ?o? response is not received, try resetting the modem by pressing the manual reset switch (s1); then type ?at? again. ensure that sure all commands are entered using uppercase letters. to take the modem off-hook, type ?atdt.? the modem should go to the off-hook state, draw loop current, and respond with a ?t?, indicating a dial tone detection. typing any characters makes the modem hang up (go on-hook) and stop drawing loop current. to make a modem connection, type ?atdt(called modem phone number).? once the connection is established, a ?c? message appears indicating the two modems are in the data mode and communicating. typing on one terminal should appear on the other terminal. to return to the command mode without
SI2400URT-EVB rev. 0.7 5 interrupting the connection between the two modems, type ?+++.? approximately two seconds later, ?o? will appear. the mode m is now in command mode and will accept ?at? commands. to return to the data mode, type ?ato.? the modem resumes the data connection and no longer accepts at commands. type ?ath? to terminate the data connection. 3. SI2400URT-EVB functional description the SI2400URT-EVB is a mu ltipurpose evaluation system. the modem daughter card illustrates the small size and small number of components required to implement an entire controller-based modem with global telecommunications compatibility. the daughter card can be used independently of, or in conjunction with, the motherboard. the motherboard adds features that enhance the ease of evaluating the many capabilities of the si2400 isomodem ? . 3.1. motherboard the motherboard provides a convenient interface to the si2400dc (daughter card). the versatile power supply allows for a wide range of ac and dc voltages to power the board. rs-232 transceivers and a db9 connector allow the SI2400URT-EVB to be easily connected to a pc or other terminal device. jumper options allow direct access to the lvcmos/ttl level serial inputs to the si2400, bypassing the rs-232 transceivers or usb interface. this is partic ularly useful for directly connecting the si2400 to embedded systems. the SI2400URT-EVB motherboard connects to the daughter card through two connectors, jp1 and jp2. jp1 is an 8x2 socket providing connection to all si2400 digital signals and regulated 3.3 v power for the si2400. the si2400 digital signals appearing at jp1 (daughter card interface) are lvcmos and ttl compatible. the si2400dc must be powered by 3.3 v. the motherboard is factory-configured for 3.3 v with jp7 pins 1 and 2. jp2 is a 4x1 socket providing connection between the daughter card and the rj-11 phone jack. 3.1.1. voltage regulator/power supply the input voltage to either j3 or j4 must be between 7.5 and 13.5 v dc or 7.5 and 13.5 v peak ac. the motherboard includes a diode bridge (d1?d4) to guard against a polarity reversal of the dc voltage or to rectify an ac voltage. the power source must be capable of continuously supplying at least 100 ma. c50 serves as a filter cap for an ac input. the voltage regulator, u1, provides 5 v for the motherboard and the input for voltage regulator u2, which outputs 3.3 v for use on the motherboard and to power the daughter card. si24xxdc power consumption can be measured by placing a meter between pins 1 and 2 of jp7. the connection between jp7 pins 1 and 2 must be made at all times when power is applied to the evaluation board either through a jumper block or a low-impedance meter to avoid damage to the daughter card. power is supplied to u2 through d5 from the usb. 3.1.2. reset circuitry the si2400 requires a reset pulse to remain low for at least 5.0 ms after the power supply has stabilized during the powerup sequence or for at least 5.0 ms during a power-on reset, then go high with a rise time <100 ns. most production si2400 modem chipset applications require that reset be controlled by the host processor. certain si2400 operation modes, including powerdown, require a hardware reset to recover. the SI2400URT-EVB contains two reset options, an automatic power-on reset device, u3 (ds1818) (default), and a manual reset switch (s1) to permit resetting the chip without removing power. a reset, regardless of the mechanism, causes all modem settings to revert to factory default values. see figure 6 on page 12 and figure 8 on page 14 for the reset circuit schematic. 3.1.3. ds1818 the ds1818 is a small, low-cost device that monitors the voltage on v d and an external reset pushbutton. if v d drops below 3.0 v, the ds1818 provides a 220 ms active-low reset pulse. upon powerup, the ds1818 also outputs an active low reset pulse for 220 ms after v d reaches 90% of the nominal 3.3 v value. the ds1818 outputs a 220 ms reset pulse any time the power supply voltage exceeds the 3.3 v 10% window. 3.1.4. manual reset the manual reset switch, s1, performs a power-on reset. this resets the si2400 to factory defaults without turning off power. if s1 is used in conjunction with u6, pressing s1 activates the reset monitor in the ds1818 and produces a 220 ms active low reset pulse. 3.1.5. interface selection the serial interface of the si2400usb-evb can be connected to a computer terminal, embedded system, or any other data terminal equipment (dte) via a standard rs-232 interface, usb interface, or through a direct ttl serial interface. the si2400 can be tested as a standard data modem by connecting the si2400usb-evb to a person al computer or other dte, power supply, and a phone line. a pc can communicate with the si2400usb-evb using a standard terminal program, such as hyperterm or procomm. jumper settings determine how the si2400usb-evb is
SI2400URT-EVB 6 rev. 0.7 connected to the dte. table 3 lists the interface contro lled by each motherboard jumper. see figure 7 on page 13 and figure 17 on page 23. 3.1.6. rs-232 interface this operation mode uses the standard factory ju mper settings illustrated in fi gure 1 on page 3. the maxim max3237 transceiver interfaces directly with the ttl leve ls available at the serial interface of the si2400 and, using internal charge pumps, makes these signals compat ible with the rs-232 standard. the rs-232 transceiver on the si2400usb-evb can communicate at rates between 300 bps and 1 mbps. this simplifies th e connection to pcs and other data terminal equipm ent (dte). the signals available on the si2400usb-evb serial interface (db9 connector) are listed in table 4. table 3. interface selection jumpers jumper function jp1 daughter card phone line connector. jp2 daughter card digital connector. jp3 direct access header. jp4 not used. jp5 usb enable (rs-232 disable). jp6 options. jp7 3.3 v power for daughter card. jp8 disable both rs-232 and usb. jp9 not used. jp10 not used. jp11 not used. jp12 enable 27 mhz clock option. table 4. db9 pin connections j1 name j1 symbol j1 pin si2400 pin si2400 name carrier detect cd 1 1 received data rxd 2 5 rxd transmit data txd 3 6 txd data terminal ready dtr 4 2 14 esc/gpio3 signal ground sg 5 12 gnd data set ready dsr 6 note 3 ready to send rts 7 nc clear to send cts 8 7 cts ring indicator rd 9 1 nc notes: 1. jp6 + jp5 jumper option. 2. jp6 jumper option. 3. dsr connected to dtr at j1.
SI2400URT-EVB rev. 0.7 7 3.1.7. usb interface the usb cable connects to j5 on the motherboard and provides both data and power. installing a jumper on jp5 enables the usb interface and disables the rs-232 interface. the usb interface is provided by u5. a usb driver for this chip is av ailable for most pc and mac operating systems on the cd. 3.1.8. direct access interface the motherboard supplies power through j3, j4, or usb, power-on reset, and an rj-11 jack for the modem. the direct access interface, jp3, is used to connect the motherboard to an embedded system. jp3 provides access to all si2400 signals available on the daughter card. it is necessary to install a jumper on jp8 to disable both the rs-232 and usb interface and prevent signal contention. leave the jumper between jp7 pins 1 and 2. figure 3 illustrates the jump er settings required for the direct access mode using the motherboard. figure 3. jumper settings for direct access interface
SI2400URT-EVB 8 rev. 0.7 3.1.9. audio output audio output is provided from the si2400 on the pin, aout. this signal allows the user to monitor call progress signals, such as dial tone, dtmf dialing, ring, busy signals, and modem negotiation. control of this signal is provided by at commands and register settings described in the introduction. the aout signal can be connected to an amplifier, such as the lm386 (the default stuffing option on the SI2400URT-EVB), for high-quality output. aout ca n also be connected to a summing amplifier or mult iplexer in an embedded application as part of an integrated audio system. 3.1.10. amplifier (lm386) the audio amplifier circuit consists of u10 (lm386), c20, r3, r4, c21, c22, c23, r5, c24, and an optional loudspeaker, ls1. the lm386 has an internally-set voltage gain of 20. r3 and r4 provide a voltage divider to reduce the aout signal to prevent overdriving the lm386. c20 provides dc blocking for the input signal and forms a high-pass filter with r3+r4, while r4 and c21 form a low-pass filter. these four components limit the bandwidth of the aout signal. c22 provides high- frequency power supply bypassing for the lm386 and should be connected to a hard ground and located very close to the amplifier?s power supply and ground pins. c23 and r5 form a compensation circuit to prevent oscillation of the high curr ent pnp transistor in the lm386 output stage on negative signal peaks. these oscillations can occur betw een 2?5 mhz and can pose a radiation compliance problem if c23 and r5 are omitted. c24 provides dc bl ocking for the output of the lm386, which is biased at approximately 2.5 v (v cc /2), and forms a high-pass filter with the impedance of the loudspeaker (ls1). the output from the lm386 amplifier circuit is available on the rca jack, j2 (not installed). install jumper jp13 to enable the onboard speaker, ls1. 3.2. modem module operation the SI2400URT-EVB daughter card is a complete modem solution perfectly suited for use in an embedded system. the daughter card requires a 3.3 v supply capable of providing at least 35 ma and communicates with the system via lvcmos/ttl-compatible digital signals on jp1. the rj-11 jack (tip and ring) is connected via jp2. be sure to provide the proper power-on reset pulse to the daughter card if it is used in the stand-alone mode. 3.2.1. reset requirements the si2400 isomodem daughter card must be properly reset at powerup. the reset pin (pin 8) of the si2400, (jp1, pin 13), must be held low for at least 5.0 ms after power is applied and stabilized and returned high with a rise time less than 100 ns to ensure the device is properly reset. 3.2.2. crystal requirements clock accuracy and stability are important in modem applications. to ensure reliable communication between modems, the clock must remain within 100 ppm of the design value over the life of the modem. the crystal selected for use in a modem application must have a frequency tolerance of less than 100 ppm for the combination of initial frequency tolerance, drift over the normal operating temperature range, and five-year aging. other considerations, such as production variations in pc board capacitance and the tolerance of loading capacitors, must also be taken into account. 3.2.3. protection the SI2400URT-EVB meets or exceeds all fcc and international ptt requirements and recommendations for high-voltage surge and isolation testing without any modification. the protection/i solation circuitry includes c1, c2, c8, c9, fb1, fb2, and rv1. the pcb layout is also a key ?component? in the protection circuitry. the SI2400URT-EVB provides isol ation to 3 kv. contact silicon laboratories for info rmation about designing to higher levels of isolation.
SI2400URT-EVB rev. 0.7 9 4. design the following pages contain the schematics, bill of materials, and layout for the si2400, includin g the daughter card and motherboard. c30 may be used for reducing emissions. aout gpio3 gpio2 gpio1 clkout rxd txd cts_n gpio4 aout cts_n reset_n rxd vcc txd gpio4 reset_n clkout gpio3 gpio2 gpio1 c1a tip ring vcc c10 c40 d3 1 3 2 y1 1 2 z4 c30 jp2 u1 si2400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 xtali xtalo clkout vd rxd txd cts resetb aout gpio4 c1a gnd isob gpio3 gpio2 gpio1 r27 c3 c26 jp1 header 8x2 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 c27 figure 4. si2400 schematic
SI2400URT-EVB 10 rev. 0.7 unless specified otherwise, capacitors are +/- 20 %, 16v all traces in the daa area (enclosed in box) must be separated from other circuits by 2.5 mm spacing for global saf ety compliance. this spacing applies to the terminals between each isolation capacitor. the isolation capacitors are as follows: c1, c4, c24, c25. refer to appendix b and application note an48 for layout guidelines unless specified otherwise, resistors are +/-5 %, 1 /16 w f1 may not be n eeded. see the sect ion on ul1950 in an17 for details. c41, c42, c43, c44 are provided for different population op tions to allow for surge testing grea ter than 3kv. c41, c42, c43, c44 are provided for different population op tions to allow for surge testing grea ter than 3kv. tip c1a ring r6 z5 q1 c43 r8 c16 d2 r28 c42 c25 r5 l1 r7 c4 c41 c6 r12 c13 q3 r15 r18 c44 c24 r10 l2 d1 f1 1 2 r24 c18 r32 rv1 c9 r2 c39 q4 r25 u2 si3015 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 tsta/qe2 tstb/dct ignd c1b rng1 rng2 qb qe vreg nc/vreg2 nc/ref dct/rext2 rext rx nc/filt tx/filt2 c8 r19 c20 r31 r16 c7 c1 c38 fb1 q2 r17 r26 fb2 c19 r9 r13 + c12 c22 + c14 + c5 d4 1 3 2 z1 r11 figure 5. si3015 daa schematic
SI2400URT-EVB rev. 0.7 11 table 5. si2400 daughter card bill of materials component value supplier* c1,c4 150 pf, 3 kv, x7r, 10% novacap c3,c13 0.22 f, 25 v, x7r, 20% venkel c5 0.1 f, 50 v, tant, 20% venkel c6,c10,c16 0.1 f, 16 v, x7r, 20% venkel c7,c8 560 pf, 250 v, x7r, 10% venkel c9 22 nf, 250 v, x7r, 10% venkel c12 1.0 f, 35 v, tant, 10% venkel c14 0.68 f, 16 v, tant, 10% avx c18,c19 3.9 nf, 16 v, x7r, 10% venkel c20 0.01 f, 16 v, x7r, 10% venkel c22 1800 pf, 50 v, x7r, 10% venkel c24,c25 1000 pf, 3 kv, x7r, 10% novacap c26,c27 33 pf, 16 v, npo, 5% venkel c38,c39 47 pf, 16 v, x7r, 10% venkel d1,d2 dual diode, 225 ma, 300 v central semiconductor d3,d4 bav99, 300 ma, 100 v diodes, inc. fb1,fb2 ferrite bead murata f1 fuse teccor jp1 header 8x2 samtec jp2 4x1 header_0 berg l1,l2 68 h, 150 ma, 4 max, 10% murata q1,q3 npn, 300 v motorola q2 pnp, 300 v motorola q4 npn, 80 v motorola rv1 sidactor, 275 v, 100 a teccor r2 402 , 1/16 w, 1% venkel r5 100 k , 1/16 w, 1% venkel r6 120 k , 1/16 w, 5% venkel r7,r8,r15?17, r19 5.36 k , 1/4 w, 1% venkel r9,r10 56 k , 1/10 w, 5% venkel r11 9.31 k , 1/16 w, 1% venkel r12 78.7 , 1/16 w, 1% venkel r13 215 , 1/16 w, 1% venkel r18 2.2 k , 1/10 w, 1% venkel r24 150 , 1/10 w, 5% venkel r25,r26 10 m , 1/10 w, 5% venkel r27,r28 10 , 1/16 w, 5% venkel r31,r32 470 , 1/16 w, 5% venkel u1 si2400 silicon labs u2 si3015 silicon labs y1 4.9152 mhz, 20 pf load, 150 esr, 50 ppm cts reeves z1 zener, 43 v, 300 mw general semi z4,z5 zener, 5.6 v, 500 mw diodes, inc. *note: many other suppliers are available. see the si2400 data sheet.
SI2400URT-EVB 12 rev. 0.7 txclk_h resetb dcd_h aout_h dcd_h eesd_h txclk_h resetb resetb eesd_h aout_h vd +3.3v +3.3v vcc vcc vd +3.3v usb rs-232 "7-12v ac or dc" "reset" jp7 for measuring current to modem (i.e. vd goes to modem only) "mux off" "usb" info info ctrl ctrl info gpio4 or aout int or aout nc or gpio4 table on silkscreen for jp6 rs-232 si2400 only si2456/57 si2401 c n r o 2 o i p g o i e e r o d c d 2 o i p g r o c n d c ri gpio3 or nc ri or txclk nc or gpio5 c n r o 3 o i p g x r o c s e r t d rts clkout or nc rts or rxclk nc or gpio1 dsr function "rxd" "txd" "ctsb" "resetb" "rtsb" "dcdb" "int" "aout" "rib" "esc" place white dot silkscreen near pin 1 "clkout" "txclk" "rxclk" "eesd" gpio1 or gpio3 "si2401: 1-2, 5-6, 7-8, 11-12, 14-15" "si2400: 2-3, 4-5, 8-9, 11-12, 13-14" "si24xx: 1-2, 4-5, 7-8, 10-11, 13-14" "si24xx alt: 1-2, 5-6, 7-8, 11-12, 14-15" "jp6: recommended settings" place white dot silkscreen near pin 1 right a ngle connector on board edge si24xx reset options "autobaud" "eeprom" "27mhz clk" "ring" "tip" "pcm" "eeprom" "si2401 27mhz clk" si2401 reset options jp7 jp5 r9 0 b4 uart mux txd_t rts_t dtr_t txd_u rts_u dtr_u rxd_m cts_m dsr_m cd_m ri_m rxd_t cts_t dsr_t cd_t ri_t rxd_u cts_u dsr_u cd_u ri_u txd_m dtr_m rts_m oe s jp11 r6 0 r11 10k jp3 header 8x2 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 r1 0 ni jp13 jp6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 r2 ls1 speaker b1 rs-232 rxd_t cts_t rts_t dtr_t dsr_t cd_t ri_t txd_r dtr_r dsr_r rxd_r rd_r cd_r cts_r txd_t rts_r c32 j3 power connector 1 2 j5 usb type b 1 2 3 4 5 r7 0 b2 usb rxd_u cts_u dsr_u cd_u ri_u txd_u rts_r dtr_u usb- usb+ r12 10k tp7 r8 1.3k j4 2.1 mm power jack 1 2 b5 daughter card socket rxd_h cts_h reset_h ri_h dcd_h aout_h ring tip txd_h esc_h rts_h clkout_h int_h eesd_h txclk_h rxclk_h eesd_h eecs_h eeclk_h r10 10k s1 sw pushbutton b6 speaker aout speaker j1 db9-rs232_1 cd(o) 1 rxd(o) 2 txd(i) 3 dtr(i) 4 sg 5 dsr(o) 6 rts(i) 7 cts(o) 8 rd(o) 9 m2 11 m1 10 j2 rca jack ni r27 0 jp4 header 5x2 1 2 3 4 5 6 7 8 9 10 r28 10k jp9 jp8 u9 cs 1 sdo 2 sdi 5 hold 7 sclk 6 wp 3 vcc 8 tp8 b3 powerblock v1 v2 usb_+5 reset rj11 1 2 3 4 5 6 7 8 9 10 11 12 jp10 jp12 figure 6. motherboard top-level schematic
SI2400URT-EVB rev. 0.7 13 reset_h ri_h dcd_h aout_h ring tip txd_h clkout_h int_h eesd_h txclk_h rxclk_h esc_h rxd_h cts_h rts_h eecs_h eeclk_h vd vd place white dot silk screen near pin 1 tip and ring minimum 20 mils wide and as far as possible from ground. connec tors for isomodem module. txd gpio3 rxd nc cts nc reset gnd nc vd gpio4 gpio5 nc nc si2401 gpio2 gpio1 txd/wr esc/d3 rxd/rd eesd/d2 cts/cs ri/d1 reset gnd int/d0 vd aout/int alt_rib/txclk/d6 rts/d7 clkout/a0/eecs si24xx dcd/d4 eeclk/d5/rxclk txd gpio1 rxd gpio2 cts gpio3 reset gnd gpio4 vd aout 15 16 13 14 11 12 9 10 7 8 6 nc nc clkout si2400 1 nc 3 4 5 net names correspond to si24 xx. see table for si2400 equivalents 2 table not on silkscreen nc jp1/3 r17 10k jp2 jp1 socket 8x2 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 r26 1.3k + c3 1.0 uf c4 470 pf fb2 + c1 1.0 uf c2 470 pf figure 7. daughter card interface schematic
SI2400URT-EVB 14 rev. 0.7 v1 v2 usb_+5 reset vcc vd +3.3v usb_vcc optional "gnd" "gnd" stando ffs in each corner of board. "+5v" "+3.3v" "gnd" + c6 470 uf 1 2 fb1 tp16 tp1 u3 ds1818 vcc 2 gnd 3 rst 1 c5 10 nf d4 c10 10 uf tp2 d1 c7 0.1 uf c9 0.1 uf tp6 c11 470 pf d3 u1 7805 in 1 out 3 gnd 2 r14 196k tp4 u2 tps77601dr gnd 1 en 2 in(1) 3 in(2) 4 reset/pg 8 fb/nc 7 out(1) 6 out(2) 5 tp18 tp3 c8 10 uf r13 1.6 r16 110k r15 0 d2 d5 bat54c tp17 tp5 figure 8. power supply schematic
SI2400URT-EVB rev. 0.7 15 rxd_t cts_t dsr_t cd_t ri_t txd_t rts_t dtr_t rxd_r cts_r cd_r rd_r dsr_r dtr_r rts_r txd_r vcc vcc c18 + c15 1.0 uf c17 + c12 1.0 uf d12 mmbz15vdc r33 10k c14 0.1 uf d13 mmbz15vdc c13 470 pf d11 mmbz15vdc d8 mmbz15vdc d9 mmbz15vdc d7 mmbz15vdc u4 max3237 c2+ 1 c2- 3 c1+ 28 c1- 25 v+ 27 v- 4 t1in 24 t2in 23 t3in 22 t4in 19 t5in 17 r1outb 16 r1out 21 r2out 20 r3out 18 en 13 gnd 2 t1out 5 t2out 6 t3out 7 t4out 10 t5out 12 vcc 26 r1in 8 r2in 9 r3in 11 mbaud 15 shdn 14 d6 mmbz15vdc r30 10k r29 10k c19 r32 10k ni c16 fb3 tp11 d10 mmbz15vdc tp10 r31 10k ni figure 9. rs-232 interface schematic
SI2400URT-EVB 16 rev. 0.7 figure 10. audio amplifier schematic figure 11. uart mux schematic speaker aout vcc c21 820 pf r3 47 k r4 3 k + c24 100 uf 1 2 r5 10 c22 0.1 uf c23 0.1 uf c20 0.1 uf + - u10 lm386m-1 3 2 5 6 1 4 8 7 txd_t rts_t dtr_t txd_u rts_u dtr_u o\e\ s dsr_m rxd_m cd_m ri_m cts_m rxd_t cts_t dsr_t cd_t ri_t rxd_u cts_u dsr_u cd_u ri_u dtr_m rts_m txd_m vcc "cts_t" "rxd_t" "rxd_u" "cts_u" tp13 tp14 tp15 u8 74cbt3257/so 1b1 2 2b1 5 3b1 11 4b1 14 1a 4 2a 7 3a 9 4a 12 1b2 3 2b2 6 3b2 10 4b2 13 oe 15 s 1 r19 10k u7 74cbt3257/so 1b1 2 2b1 5 3b1 11 4b1 14 1a 4 2a 7 3a 9 4a 12 1b2 3 2b2 6 3b2 10 4b2 13 oe 15 s 1 tp12 r18 10k
SI2400URT-EVB rev. 0.7 17 figure 12. usb interface schematic txd_u rts_r dtr_u usb- usb+ rxd_u cts_u dsr_u cd_u ri_u usb_vcc u11 gms05f 5 4 1 2 3 tp19 + c29 1.0 uf c31 r20 4.7 k u5 cp2101 /02 regin 7 vdd 6 gnd 3 vbus 8 d- 5 d+ 4 cts 23 rts 24 rxd 25 txd 26 dsr 27 dtr 28 dcd 1 ri 2 suspend 11 suspend 12 rst 9
SI2400URT-EVB 18 rev. 0.7 5. si24xx motherboard bill of materials value rating tolerance foot print dielectric manufacturer number manufacturer 1 5 c1,c3,c12,c15,c29 1.0 uf 10 v 10% 3216_eiaa tant ta010tcm105-kal venkel 2 4 c2,c4,c11,c13 470 pf 25v 5% cc0805 x7r c0805c471j5gactu tti 3 1 c5 10 nf 16 v 10% cc0603 x7r c0603x7r160-103kne venkel 4 1 c6 470 uf 25 v 20% c5x10mm-rad electrolytic uvx1e471mpa nic components 5 2 c7,c9 0.1 uf 25 v 10% cc0805 x7r c0805x7r250-104kne venkel 6 2 c10,c8 10 uf 16v 10% cc1206 x7r c1206x7r100-106kne venkel 7 10 c14,c16,c17,c18,c19,c2 0,c22,c23,c31,c32 0.1 uf 16 v 20% cc0603 x7r c0603x7r160-104mne venkel 8 1 c21 820 pf 50 v 5% cc0805 npo c0805cog500-821jne venkel 9 1 c24 100 uf 16 v 10% c2.5x6.3mm-rad electrolytic uvx1c101mea1td nichicon 10 4 d1,d2,d3,d4 diode 30 v 0.5 a sod123 mbr0530t1 motorola 11 1 d5 bat54c sot-23 bat54c diodes inc. 12 8 d6,d7,d8,d9,d10,d11,d1 2,d13 mmbz15vdc sot-23 mmbz15vdc general semiconductor 13 3 fb1,fb2,fb3 ferrite bead rc0805 blm21a601s murata 14 1 jp1 socket 8x2 conn2x8 ssw-108-01-t-d samtec 15 1 jp2 4x1 socket conn4[6238] ssw-104-01-t-s samtec 16 1 jp3 header 8x2 conn2x8 517-6121tn samtec 17 1 jp4 header 5x2 conn2x5[6238]ra tsw-105-25-t-d-ra samtec 18 8 jp5,jp7,jp8,jp9,jp10,jp 11,jp12,jp13 2x1 header conn2[6040] 517-611tn berg 19 1 jp6 3x5 header conn3x5 20 1 j1 db9-rs232_1 conn9[6543]dbf k22-e9s-030 kycon 21 1 j2 rca jack conn2[12090]rc a 16pj097 mouser 22 1 j3 power connector tb2[12065]tsa 506-5uld02 mouser 23 1 j4 2.1 mm power jack conn3[175120]p wr adc-002-1 adam tech 24 1 j5 usb type b conn-usb-b 897-30-004-90-000000 mill-max 25 1 ls1 speaker hcm12a[9052] hcm1206a jl world 26 1 rj11 mtjg-2-64-2-2-1 rj11[6238]dual mtjg-2-64-2-2-1 adam tech 27 6 r2,r6,r7,r9,r15,r27 0 1/10 w rc0603 cr0603-10w-000jt venkel 28 1 r3 47 k 1/10 w 5% rc0805 nrc10j473tr nic components 29 1 r4 3 k 1/10 w 5% rc0805 nrc10j302tr nic components 30 1 r5 10 1/10 w 1% rc0805 nrc10f10r0tr nic components 31 2 r26,r8 1.3k 1/16 w 5% rc0603 cr0603-16w-132jt venkel 32 10 r10,r11,r12,r17,r18,r1 9,r28,r29,r30,r33 10k 1/16 w 5% rc0603 cr0603-16w-103jt venkel 33 1 r13 1.6 1/8 w -0.05 rc1206 cr1206-8w-1r6jt venkel 34 1 r14 196k rc0805 mchridezhfx1963e classic comp 35 1 r16 110k rc0805 cr21-114j-t classic comp 36 1 r20 4.7 k 1/10 w 5% rc0805 nrc10j472tr nic components 37 1 s1 sw pushbutton sw4[6240]pb 101-0161 mouser 38 3 tp1,tp2,tp18 black test point conn1[6040] 151-203 mouser 39 4 tp3,tp4,tp5,tp6 stand off mh-125 40 8 tp7,tp8,tp10,tp11,tp12, tp13,tp14,tp15 blue test point conn1[6040] 151-205 mouser 41 2 tp16,tp17 red test point conn1[6040] 151-207 mouser 42 1 tp19 blue test point conn1[6040] 151-207 mouser 43 1 u1 7805 to-220-ld ua7805ckc texas instruments 44 1 u2 tps77601dr so8 tps77601dr texas instruments 45 1 u3 ds1818 sot-23 ds1818-10 dallas semiconductor 46 1 u4 max3237 sop65x780-28n max3237e (sipex sp3238e 2nd source) maxim 47 1 u5 cp210 1/02 28-pin mlp cp210 1/02 silicon laboratories 48 2 u8,u7 74cbt3257/so sop65x780-16n sn74cbt3257dbr texas instruments 49 1 u9 pdip socket dip8-skt 210-93-308-41-001000 mill-max 50 1 u10 op-amp so8 lm386m-1 national semi 51 1 u11 gms05f sot-23-5n gms05f vishay item quantit y reference
SI2400URT-EVB rev. 0.7 19 6. pcb layers figure 13. daughter card component side silkscreen
SI2400URT-EVB 20 rev. 0.7 figure 14. daughter card solder side silkscreen
SI2400URT-EVB rev. 0.7 21 figure 15. daughter card component side layout
SI2400URT-EVB 22 rev. 0.7 figure 16. daughter card solder side layout
SI2400URT-EVB rev. 0.7 23 figure 17. motherboard silkscreen (front side)
SI2400URT-EVB 24 rev. 0.7 figure 18. motherboard silkscreen (back side)
SI2400URT-EVB rev. 0.7 25 figure 19. motherboard component side layout
SI2400URT-EVB 26 rev. 0.7 figure 20. motherboard solder side layout
SI2400URT-EVB rev. 0.7 27 figure 21. motherboard ground plane layout
SI2400URT-EVB 28 rev. 0.7 figure 22. motherboard power plane layout
SI2400URT-EVB rev. 0.7 29 7. complete design package on cd (see sales representative for details) silicon laboratories can provide a complete design package of the SI2400URT-EVB including the following: orcad schematics gerber files bom documentation contact your local sales representati ve or silicon laborato ries headquarter sales for ordering information.
SI2400URT-EVB 30 rev. 0.7 d ocument c hange l ist revision 0.6 to revision 0.7 updated from rev 1.0 motherboard to rev 3.2 motherboard. updated the following figures and tables: figures 1,3,5,6,7,8,9,10,11, and 12 table 6 added the following figures: figures 2,19,20,21,22,23,24 updated "2. SI2400URT-EVB setup and evaluation?" on page 2.
SI2400URT-EVB rev. 0.7 31 n otes :
SI2400URT-EVB 32 rev. 0.7 c ontact i nformation silicon laboratories inc. 4635 boston lane austin, tx 78735 tel: 1+(512) 416-8500 fax: 1+(512) 416-9669 toll free: 1+(877) 444-3032 email: sidaainfo@silabs.com internet: www.silabs.com silicon laboratories, silicon labs, and isomodem are trademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. the information in this document is believed to be accurate in all respects at the time of publ ication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and om issions, and disclaims responsibi lity for any consequences resu lting from the use of information included herein. ad ditionally, silicon laboratorie s assumes no responsibility for the functioning of und escribed features or parameters. silicon laboratories reserves the right to make changes without further notice . silicon laboratories makes no wa rranty, rep- resentation or guarantee regarding the suitability of its products for any particular purpose, nor does silicon laboratories as sume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any and all liability, including wi thout limitation conse- quential or incidental damages. silicon laborat ories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of t he silicon laboratories product could create a s ituation where per- sonal injury or death may occur. should buyer purchase or us e silicon laboratories products for any such unintended or unauthor ized ap- plication, buyer shall indemnify and hold silicon laboratories harmles s against all claims and damages.

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