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rev. 0.1 11/11 copyright ? 2016 by silicon laboratories si4822/26-demo si4822/26-demo si4822/26 d emo b oard u ser ? s g uide 1. features ?? atdd (analog tune and digital display) fm/am/sw radio ?? worldwide fm band support from 64 to 109 mhz with 5 default sub-bands: ?? fm1 87?108 mhz (demo board default) ?? fm2 86.5?109 mhz ?? fm3 87.3?108.25 mhz ?? fm4 76?90 mhz ?? fm5 64?87 mhz (demo board default) ?? worldwide am band support from 504 to 1750 khz with 5 default sub-bands: ?? am1 520?1710 khz (demo board default) ?? am2 522?1620 khz (demo board default) ?? am3 504?1665 khz ?? am4 520?1730 khz ?? am5 510?1750 khz ?? worldwide sw band support from 2.3 to 28.5 mhz with 16 default sub-bands: ?? sw1 5.6?6.4 mhz (demo board default, for si4826 only) ?? sw2 5.95?6.2 mhz ?? sw3 6.8?7.6 mhz (demo board default, for si4826 only) ?? sw4 7.1?7.6 mhz ?? sw5 9.2?10 mhz (demo board default, for si4826 only) ?? sw6 9.2?9.9 mhz ?? sw7 11.45?12.25 mhz (demo board default, for si4826 only) ?? sw8 11.6?12.2 mhz ?? sw9 13.4?14.2 mhz (demo board default, for si4826 only) ?? sw10 13.57?13.87 mhz ?? sw11 15?15.9 mhz (demo board default, for si4826 only) ?? sw12 15.1?15.8 mhz ?? sw13 17.1?18 mhz (demo board default, for si4826 only) ?? sw14 17.48?17.9 mhz ?? sw15 21.2?22 mhz (demo board default, for si4826 only) ?? sw16 21.45?21.85 mhz ?? twelve positions band switch or one push button for selecting different band according to the target application. ?? two aaa battery operations wit h working voltage down to 2.0 v ?? economical potentiometer for frequency tuning re places more expensive variable capacitor (pvc) ?? potentiometer and/or push button volume control ?? fm 50 s or 75 s (default) de-emphasis ?? 9-level bass/treble via push button control for fm ?? 7-level bass/treble via push button control for am/sw ?? fm/am/sw band indicator and frequency display in lcd ?? 24 matrix keypad interface ?? the frequency range of each band, de-emphasis an d am channel space can be re-configured by host mcu.
si4822/26-demo 2 rev. 0.1 2. overview this manual describes the operation of the silicon la bs si4822/26-demo board rev1 .0, october 24, 2011. the silicon laboratories si 4822/26-demo board is designed with the 24 -pin ssop-packaged si4822/26 chip, the revolutionary single chip am/fm/sw receiver that integr ates everything from antenn a input to audio output and allows use of common and economical potentiometers to do the frequency tuning. it provides a complete portable analog tune digital display am/fm/sw radio design. the lcd displays the tuning information. the si4822/26- demo is designed with 1-laye r pcb, allowing the lowest cost without sacrificing the rf performance. the demo board works with two aaa batteries and working voltage down to 2.0 v.
si4822/26-demo rev. 0.1 3 3. description figure 1 and figure 2 shows the physical layout of the board with key components indicated. figure 1. si4822/26-demo board top side in time mode figure 2. si4822/26-demo board bottom side
si4822/26-demo 4 rev. 0.1 power: bat1: 2 cells aaa battery compartment audio connectors: j5: stereo audio headphone output antenna selections: am antenna: ferrite stick antenna for am j6: sma connector for am conductive testing s11: am antenna selector j1: bnc connector for fm/ sw conductive testing or fm whip antenna s12: fm antenna selector radio band selection: the demo board provides two methods for selecting the radio band: one is to use the sli de switch s2, another is to use the power/band button. s14 dete rmines which method is in use. s14: 1-2: sma for am conductive test 2-3: am ferrite antenna 3 2 1 1-2: bnc (j1) 2-3: hp ant (j5) 3 2 1 1-2: use slide switch to select band 2-3: use push button to select band 3 2 1
si4822/26-demo rev. 0.1 5 radio band property setting: s13: audio output test point: for the general specification test, tp3 is the recommend ed audio signal test point. the audio test instrument should be connected to tp3 to get more accurate test resu lts. j5 can also be used as an audio test point, but the test results may not be entirely accurate under some circumstances. main components: u1: silicon laboratories si4822/ 26 am/fm/sw atdd receiver u2: audio amplifier u3: mcu lcd: the digital display of tuning frequency 3 2 1 1-2: use the keypad to set the band propery via mcu 2-3: use the tuner default band setting values 2 1gnd aout
si4822/26-demo 6 rev. 0.1 control interface: vr1: frequency tuning wheel vr2: volume control wheel s3~s8, s10: the keypad s2: band slide switch for fm, am, and sw band definition: 1: fm1 (87?108 mhz), de-emphasis = 75 s 2: fm5 (64?87 mhz), de-emphasis = 75 s 3: am1 (520?1710 khz), 10 khz spacing 4: am2 (522?1620 khz), 9 khz spacing 5: sw1 (5.6?6.4 mhz) 6: sw3 (6.8?7.6 mhz) 7: sw5 (9.2?10.0 mhz) 8: sw7 (11.45?12.25 mhz) 9: sw9 (13.4?14.2 mhz) 10: sw11 (15?15.9 mhz) 11: sw13 (17.1?18 mhz) 12: sw15 (21.2? 22 mhz) human interface: there are seven keys for controlling the demo board as shown below: each key can have a different function under each operating condition: ?? time mode: radio function is disabled. lcd displays time. buttons can be used to set time, alarm, etc. ?? fm/am/sw radio mode: tuner ic wor ks in power up mode. radio function is enabled. lcd displays the radio station parameters. buttons are used to adjust radio settings. the functions of the buttons are summarized in table 1. the fm/am/sw radio parameters that can be configured are listed in table 2. 3 2 1 45 6 789 11 10 12 treble/al bass/tmr de/spc setting down/vol- up/vol+ power/band
si4822/26-demo rev. 0.1 7 table 1. key function description button/mode time mode tuner off fm/am/sw radio mode tuner on power/band hold time < 1s none change between fm, am, and sw (1 fm band, 1 am band and 8 sw bands) hold time > 1s enable radio disable radio function and enter time mode (radio parameters will be saved to mcu). de/spc none fm mode: change de-emphasis, between 50 s and 75 s. am mode: change channel space, between 9 khz and 10 khz. bass/tmr enter or quit time setting menu. decrease bass/treble level by 1 step. treble/al enable or disable the alarm function; enter or quit alarm setting menu. increase bass/treble level by 1 step. up/vol+ hold time < 1s in setting menu, change the current time/alarm parameter by one unit per each press. in radio setting menu, change the current parameter by one unit per each press. in radio working mode, increase volume 1 step per each press. hold time > 1s in setting menu, change the current time/alarm parameter automatically. in radio setting menu, change the current parameter automatically. in radio working mode, increase volume level automatically until to maximum. down/vol- hold time < 1s in setting menu, change the current time/alarm parameter by one unit per each press. in radio setting menu, change the current parameter by one unit per each press. in radio working mode, decrease volume 1 step per each press. hold time > 1s in setting menu, change the current time/alarm parameter automatically. in radio setting menu, change the current parameter automatically. in radio working mode, decrease volume level automatically until to minimum. setting hold time < 1s none in radio setting menu, change the selected item per each press. hold time > 1s none quickly return to fm working mode.
si4822/26-demo 8 rev. 0.1 notes: tone/vol mode has four selections: ?? bass/treble mode: no digital volume control, fixed volume level at 59 ?? digital volume mode: no bass/treble ef fect, volume levels from 0 to 63 ?? mixed mode 1: bass/treble and digital volume coexis t, volume levels from 0 to 63, scale to 0~59 ?? mixed mode 2: bass/treble and digital volume coexist, volume levels from 0 to 63 the tuning preference of fm has two selections: ?? preference1: when tuning to adjacent channels, the volume level decreases by 2 db ?? preference2: when tuning to adjacent channels, the volume level remains unchanged the tuning preference of sw has two selections: ?? preference1: when tuning to adjacent channels, the volume level decreases by 2 db ?? preference2: when tuning to adjacent channels, the volume level remains unchanged there is no tuning preference selection for am mode. table 2. radio configuration parameters fm parameter am parameter sw parameter bass/treble: 0-8 default: 4 bass/treble: 1-7 default: 3 bass/treble: 1-7 default: 3 digital volume: 0-63 default: 63 digital volume: 0-63 default: 63 digital volume: 0-63 default: 63 band top: max 109 mhz default: 108 mhz band top: max 1750 khz default: 1710 khz band top: max 28.5 mhz default: 6.4/7.6/10/12. 25/14.2/15.9/18/22 mhz for sw1 to sw8 respectively band bottom: min 64 mhz default: 87.5 mhz band bottom: min 504 khz default: 522 khz band bottom: min 2.3 mhz default: 5.6/6.8/9.2/11 .45/13.4/15/17.121.2 mhz for sw1 to sw8 respectively band range: max 22 mhz band range: max 2.2 mhz band range: max 1.1 mhz de-emphasis: 50 or 75 s default: 75 s channel space: 9 or 10 khz default: 9 khz tone/vol mode: a-d default: d tuning preference: a-d default: b
si4822/26-demo rev. 0.1 9 4. operation the si4822/26-demo board, a complete analog tune and digital display radio, provides two major modes of operation: time mode and fm/am/sw radio mode. 4.1. time mode place two aaa batteries into the batt ery compartment. the board will automati cally enter time mode and display the time. the demo board display in time mode is illustrated in figure 1. 4.1.1. time setting the time default value is 00:00 and can be se t to the correct time manually when needed. 1. in time mode, press the bass/tmr button to enter the setting menu. the default is to set the minute item first. press this button again to select the hour item. the selected item flashes. 2. while the selected item is flashing, press the down/vol- and up/vol+ button to set the desired time. 3. when you have finished settin g the time, press bass/tmr button to quit the setting menu. the mcu will automatically quit the setting menu if there is no operation within 2 seconds. 4.1.2. alarm setting 1. in time mode, press the treble/al button to enabl e or disable the alarm function and to enter the setting menu automatically when the alarm is enabled. once you have entered the setting menu, the default is to set the minute item first. pressing this button again will select the ho ur item. the select ed item flashes. 2. while the selected item is flashing, press the down/vol- and up/vol+ button to set the desired time. 3. when you have finished the al arm setting, press treble/al button to quit the set menu. the mcu will automatically quit the setting menu if there is no operation within 2 seconds. 4. if the alarm is enabl ed and the alarm setting time is matched, the radi o will be automatically turned on after the buzzer sounds for 5 seconds. 5. the radio will be turned off and the demo board will go into sleep mode automatically if there is no operation on the push buttons within 15 minutes; if there is any operat ion on the push buttons, the auto- sleep function will be disabled . the radio keeps working throughout this time.
si4822/26-demo 10 rev. 0.1 4.2. fm/am/sw radio mode in time mode, the device will enter fm/am/sw mode after a long press (hold time > 1s) of the power/band button or when the alarm time is reached. the lcd displays the following information: band indicator, band frequency indicator, and sleep indicator in case the radio is automatically turned on by the alarm. the demo board display in fm/am/sw mode is illustrated in figure 3. figure 3. lcd display in fm radio mode the demo board provides two methods to select the radio ba nd: one is to use the slide switch (s2), the other is to use the power/band push button. s14 determines which method is in use. the demo board also provides two methods to set the band property: one is to use tuner default values, the other is to use the keypad to reconfigure band property valu e via the mcu. s13 determines which method is in use. if you use the tuner default values, the band property is fixe d and cannot be re-configured. refer to section "4.2.1. mcu setting band property? for the operation details for setting the band property using the keypad. to operate the demo board, follow these procedures: 1. according to the desired radio band selection meth od, set s14 to use the slide switch or push button. 2. according to the desired radio band property, set s 13 to use tuner default values or reconfigure the band property. 3. hold the power/band push button (hold time > 1s) or when the ala rm time is reached, the device will enter fm/am/sw mode. 4. use slide switch s2 or press the powe r/band push button to select the desired band. 5. refer to section "4.2.1. mcu se tting band property? or section "4.2.2. mcu setting radio working mode? to reconfigure the band property or radio working mode if necessary. 6. rotate the tuning wheel and find the desired radio station with the help of the lcd display and/or tuning indicator d1. 7. rotate the volume control wheel vr2 and/or press the down/vol- or up/vol+ button to get a comfortable volume. pre ss the bass/tmr or treble/al button to get the desired bass/treble level. notes: ?? for fm listening, the earphone cable must be connected to the board when s12 is set to hp ant or an external antenna must be co nnected to the bnc connector when s12 is set to bnc. ?? for am listening, the ferrite antenna must be connected to the board and the s11 is set to ferrite before turning on the radio or switching the band to am.
si4822/26-demo rev. 0.1 11 4.2.1. mcu setting band property the demo board provides the function that the band prop erty can be set by the mcu. the band property includes: ?? band top ?? band bottom ?? de-emphasis (only for fm) ?? channel space (only for am) the setting menu is illustrated in figure 4. to set the band properties, follow these steps: 1. press the setting button to enter the setting menu and select the item to be set. the selected item flashes for 1 second, then automatica lly switches to its current value. 2. while the value is flashing, press the down/vol- or up/vol+ button to set the desired value within 3 seconds. 3. repeat step 1 and 2 to finish setting the band properties. 4. when the band properties are set, the mcu automatica lly quits setting menu if there is no operation within 3 seconds. 5. in fm working mode, press the de/spc button to set the de-emphasis 50 s or 75 s. 6. in am working mode, press the de/spc bu tton to set the channel space 9 khz or 10 khz. figure 4. setting menu setting menu: 1 band top 2 band bottom 3 tone/vol mode 4 tuning preference a preference1 b preference2 a bass/treble mode b dig-vol mode c mix mode1 d mix mode2
si4822/26-demo 12 rev. 0.1 4.2.2. mcu setting radio working mode the host mcu can set the radio work ing mode. the working mode includes: ?? tone/volume mode (only for fm mode), item 3 in setting menu ?? tuning preference (only for fm and sw), item 4 in setting menu to set radio working mo de, follow these steps: 1. press the setting button to enter the item 3. the lcd displays the item number st3 for 1 second, then automatically switches to its mode indication. 2. press the down/vol- or up/vol+ button to select the desired mode within 3 seconds. 3. repeat step 1 and 2 to set the tuning preference by setting the item 4. 4. when the radio working mode is set, the mcu automa tically quits the setting menu if there is no operation within 3 seconds.
si4822/26-demo rev. 0.1 13 5. bill of materials ?? atdd am/fm/sw receiver ic si4822/26 with extern al 32.768 khz crystal oscillator support ?? lm4910ma audio amplifier ic ?? tm8795 mcu ?? see table 3 for details table 3. si4822/26-demo board bill of materials rev 1.0 item qty reference description value 1 12 c1-2 c6 c19 c24 c37-42 c44 cap,sm,0603,x7r 0.1 2 2 c5 c36 cap,sm,0603,x7r 0.47 3 2 c8 10 cap,sm,0603,cog 100 p 4 1 c33 cap,sm,0603,cog 10 p 5 4 c28-29 c32 c35 cap,sm,0603,cog 22 p 6 1 c11 cap,sm,0603,x7r 330 p 7 2 c30-31 cap,sm,0603,x7r 33 n 8 1 c34 cap,sm,0603,cog 33 p 9 1 c15 cap,sm,0603,x7r 4.7 10 2 c4 c12 cap,sm,0603,x7r 10 11 1 c13 cap,sm,1210,x7r 47 12 1 c18 cap,sm,0603,x7r 820 p 13 2 c23 c27 cap,sm,1210,x7r 220 14 2 c14 c25 electrolytic capacitor 100 /4 v 15 1 c3 electrolytic capacitor 220 /4 v 16 2 r5-6 res,sm,0603 2 k 17 1 r27 res,sm,0603 100 r 18 1 r34 res,sm,0603 100 k 19 1 r32 res,sm,0603 10 r 20 2 r3 r42 res,sm,0603 10 k 21 1 r41 res,sm,0603 120 k 22 1 r22 res,sm,0603 12 k 23 2 r1-2 res,sm,0603 1 m 24 2 r4 r31 res,sm,0603 1 k 25 1 r24 res,sm,0603 200 r 26 1 r13 res,sm,0603 22 r 27 1 r16 res,sm,0603 2.2 k 28 1 r20 res,sm,0603 6.8 k 29 1 r21 res,sm,0603 np 30 1 r7 res,sm,0603,tolerance 1% 10 k 1% 31 1 r29 res,sm,0603,tolerance 1% 160 k 1%
si4822/26-demo 14 rev. 0.1 32 9 r9-12 r14-15 r28 r33 r35 res,sm,0603,tolerance 1% 20 k 1% 33 1 r43 res,sm,0603,tolerance 1% 30 k 1% 34 1 r36 res,sm,0603,tolerance 1% 33 k 1% 35 1 r8 res,sm,0603,tolerance 1% 40 k 1% 36 1 r44 res,sm,0603,tolerance 1% 47 k 1% 37 1 u1 si4822/26 ssop24 si4822/26 38 1 u2 lm4910ma,so8 lm4910ma 39 1 u3 tm8795 44 pin tm8795 44 pin 40 1 q2 transistor npn sot23 2n3904 41 1 q1 transistor npn sot23 2sc9018 42 1 q3 transistor npn sot23 2n3906 43 2 d2 d4 diode,sm,esd,sot23 bav99 44 3 b4 b5 b6 ferrite bead,sm,0603 2.5 k/100 m 45 1 b1 ferrite bead,sm,0603 np 46 1 bz1 buzzer buzzer 47 2 y1-2 crystal 32.768 khz 48 1 d1 led led 49 1 d6 1n4148 1n4148 50 1 j5 stereo earphone jack with switch 3.5 mm 51 1 l1 res,sm,0603 0r 52 1 l3 ind,sm,0603 120 nh 53 1 tp3 conn,th,1x2,hdr conn,th,1x2,hdr 54 1 lcd1 lcd lcd 55 1 j1 bnc vertical bnc for fm testing 56 1 j6 sma vertical sma for am testing 57 1 ant1 aw ferrite stick antenna 220 h 58 1 bat1 battery box ,aaa*2 size 59 4 s11-14 one pole two throw switch 60 1 s2 single pole twelve throw switch 61 8 s1 s3-8 s10 push button 62 1 vr1 100 k, 10%,variable resistor(pot) 100 k 63 1 vr2 10k,20%,variable resistor(pot) 10 k table 3. si4822/26-demo board bill of materials rev 1.0 (continued) item qty reference description value
si4822/26-demo rev. 0.1 15 6. schematics and gerber fm1 (87mhz - 108mhz) fm5 (64mhz - 87mhz) am1 (520khz - 1710khz) fm/sw mw si4822/26-a am2 (522khz - 1620khz) sw1 (5.6mhz - 6.4mhz) sw3(6.8mhz - 7.6mhz) sw5(9.2mhz - 10.0mhz) sw7(11.45mhz - 12.25mhz) sw9 (13.4mhz - 14.2mhz) sw11 (15mhz - 15.9mhz) sw13 (17.1mhz - 18mhz) sw15 (21.2mhz - 22mhz) audio output s13: band property 2-3 tuner default 2-1 mcu setting s14: band selection 2-3 slide switch 2-1 push button test point aout gnd c39 0.1u ba t1 aaa*2 12 3 4 5 6 7 8 9 10 11 12 13 s2 r15 20k 1% r10 20k 1% r12 20k 1% r11 20k 1% r14 20k 1% r9 20k 1% r7 10k 1% r8 40k 1% r28 20k 1% r29 160k 1% j1 c19 0.1u c15 4.7u vr1 100k 10% c6 0.1u d4 ba v99 c5 0.47u q1 2sc9018 r31 1k r32 10r c30 33n c33 10p r41 120k c31 33n b6 2.5k/100m c36 0.47u ant1 mw ferrite antenna j6 d2 ba v99 r34 100k c34 33p 1 lna_en 2 irq 3 tune1 4 tune2 5 ba nd 6 nc 7 nc 8 fmi 9 rfgnd 10 nc 11 nc 12 ami 13 gnd 14 gnd 15 rst 16 sdio 17 sclk 18 xtalo 19 xtali 20 vdd1 21 vdd2 22 dbyp 23 nc 24 aout u1 c1 0.1u r27 100r r33 20k 1% r35 20k 1% r36 33k 1% c13 47u r43 30k 1% r44 47k 1% c14 100u/4v l1 0r/120nh c4 10u c12 10u vr2-a 1 2 3 j5 c24 0.1u r20 6k8 r22 12k b4 2k5/100m b5 2k5/100m 1 in1 2 in2 3 shutdown 4 gnd 5 vdd 6 vo3 7 vo2 8 vo1 u2 lm4910ma c10 100p c11 330p r16 2k2 c18 820p c23 220u c27 220u c8 100p b1 nc c25 100u/6.3v y1 32.768khz c28 22p c29 22p r3 10k r21 nc r42 10k s11 1 2 3 s13 1 2 3 s14 r5 2k r6 2k l3 120nh tp1 s12 tp3 vcc ba nd [1] lna_en [1] lna_en [1] ba nd [1] tune1 [1] tune1 [1] reset [2] vcc vcc vcc fmi [1] irq [2] sclk [2] sdio [2] vcc xtali [2] fmi [1] vcc shutdown [2] vcc figure 5. si4822/26-demo board rev 1.0 schematic?radio and audio portions
si4822/26-demo 16 rev. 0.1 division drawn appd date model no date october.24.20 si4822/26-demo mcu lcd key buzzer jing wang 1 band top 2 ba nd bottom 3 tone/vol mode d mix mode2 c mix mode1 b dig-vol mode a bass/treble mode setting menu: b preference2 a preference1 4 tuning preference s5 bass/tmr s3 power/band s4 de/spc s6 treble/al s7 up/vol+ s8 down/vol- s10 setting bz1 q2 2n3904 r4 1k d6 1n4148 c2 0.1u c3 220u/4v r13 22r mhz sw mw fm sleep khz mhz pm 1 com1 2 com2 3 com3 4 seg0 5 seg1 6 seg2 7 seg3 8 seg4 9 seg5 10 seg6 11 seg7 12 seg8 13 seg9 14 seg10 15 seg11 16 seg12 17 seg13 lcd1 1 ba k 2 xin 3 xout 4 gnd 5 vdd1 6 vdd2 7 vdd3 8 cup1 9 cup2 10 com1 11 com2 12 com3 13 com4 14 com5 15 seg1(k1) 16 seg2(k2) 17 seg3(k3) 18 seg4(k4) 19 seg5(k5) 20 seg6(k6) 21 seg7(k7) 22 seg8(k8) 23 seg9(k9) 24 seg10(k10) 25 seg11(k11) 26 seg12(k12) 27 seg21 28 seg22 29 seg23 30 seg24/ioa1 31 seg25/ioa2 32 seg26/ioa3 33 seg27/ioa4 34 seg28/iob1/elc 35 seg29/iob2/elp 36 seg30/iob3/bzb 37 seg31/iob4/bz 38 seg32/ioc1/ki1 39 seg33/ioc2/ki2 40 seg34/ioc3/ki3 41 seg35/ioc4/ki4 42 reset 43 int 44 test u3 y2 32.768khz c32 22p c35 22p c37 0.1u c38 0.1u c40 0.1u q3 2n3906 r1 1m r2 1m c41 0.1u s1 reset c42 0.1u c44 0.1u d1 tuning indicator r24 200r key_r1 [2] key_c3 [2] key_c1 [2] key_c0 [2] key_c2 [2] key_r0 [2] bz [2] vcc lcd_c1 [2] lcd_c2 [2] lcd_c3 [2] lcd_s0 [2] lcd_s1 [2] lcd_s2 [2] lcd_s3 [2] lcd_s4 [2] lcd_s5 [2] lcd_s6 [2] lcd_s7 [2] lcd_s8 [2] lcd_s9 [2] lcd_s10 [2] lcd_s11 [2] lcd_s12 [2] lcd_s13 [2] lcd_c1 [2] lcd_c2 [2] lcd_c3 [2] key_r0 [2] key_r1 [2] lcd_s0 [2] lcd_s1 [2] lcd_s2 [2] lcd_s3 [2] lcd_s4 [2] lcd_s5 [2] lcd_s6 [2] lcd_s7 [2] lcd_s8 [2] lcd_s9 [2] lcd_s10 [2] lcd_s11 [2] lcd_s12 [2] sdio [1] reset [1] sclk [1] lcd_s13 [2] bz [2] key_c0 [2] key_c1 [2] key_c2 [2] key_c3 [2] irq [1] vcc vcc vcc xtali [1] vcc shutdown [1] figure 6. si4822/26-demo board gerber rev 1.0 schematic?mcu portion
si4822/26-demo rev. 0.1 17 figure 7. si4822/26-demo board gerber rev 1.0
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