Si4822/26-DEMO Si4822/26 D EMO B OA RD 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) 86.5–109 MHz FM3 87.3–108.25 MHz FM4 76–90 MHz FM5 64–87 MHz (Demo Board Default) FM2 Worldwide AM band support from 504 to 1750 kHz with 5 default sub-bands: AM1 520–1710 kHz (Demo Board Default) 522–1620 kHz (Demo Board Default) AM3 504–1665 kHz AM4 520–1730 kHz AM5 510–1750 kHz AM2 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 with working voltage down to 2.0 V Economical potentiometer for frequency tuning replaces more expensive variable capacitor (PVC) Potentiometer and/or push button volume control FM 50 µs or 75 µs (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 2×4 matrix keypad interface The frequency range of each band, de-emphasis and AM channel space can be re-configured by host MCU. Rev. 0.1 11/11 Copyright © 2016 by Silicon Laboratories Si4822/26-DEMO Si4822/26-DEMO 2. Overview This manual describes the operation of the Silicon Labs Si4822/26-DEMO Board Rev1.0, October 24, 2011. The Silicon Laboratories Si4822/26-DEMO Board is designed with the 24-pin SSOP-packaged Si4822/26 chip, the revolutionary single chip AM/FM/SW receiver that integrates everything from antenna 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 Si4822/26DEMO is designed with 1-layer 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. 2 Rev. 0.1 Si4822/26-DEMO 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 Rev. 0.1 3 Si4822/26-DEMO 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 1-2: SMA for AM Conductive Test 2-3: AM Ferrite Antenna 1 2 3 J1: BNC connector for FM/ SW conductive testing or FM whip antenna S12: FM antenna selector 1 2 1-2: BNC (J1) 2-3: HP ANT (J5) 3 Radio Band Selection: The demo board provides two methods for selecting the radio band: one is to use the slide switch S2, another is to use the POWER/BAND button. S14 determines which method is in use. S14: 1 2 1-2: Use slide switch to select band 2-3: Use push button to select band 3 4 Rev. 0.1 Si4822/26-DEMO Radio Band Property Setting: S13: 1 2 1-2: Use the keypad to set the band propery via MCU 2-3: Use the tuner default band setting values 3 Audio Output Test Point: For the general specification test, TP3 is the recommended audio signal test point. The audio test instrument should be connected to TP3 to get more accurate test results. J5 can also be used as an audio test point, but the test results may not be entirely accurate under some circumstances. 1 GND 2 AOUT Main Components: U1: Silicon Laboratories Si4822/26 AM/FM/SW ATDD receiver U2: Audio amplifier U3: MCU LCD: The digital display of tuning frequency Rev. 0.1 5 Si4822/26-DEMO Control Interface: VR1: Frequency tuning wheel VR2: Volume control wheel S3~S8, S10: The keypad S2: Band slide switch for FM, AM, and SW 1 2 3 4 5 6 7 8 9 10 11 12 Band definition: 1: FM1 (87–108 MHz), De-emphasis = 75 µs 2: FM5 (64–87 MHz), De-emphasis = 75 µs 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: TREBLE/AL BASS/TMR DE/SPC SETTING DOWN/VOL- UP/VOL+ POWER/BAND 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 works 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. 6 Rev. 0.1 Si4822/26-DEMO Table 1. Key Function Description Button/Mode POWER/BAND Time Mode Tuner Off FM/AM/SW Radio Mode Tuner On 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). None FM mode: Change De-emphasis, between 50 µs and 75 µs. DE/SPC 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. UP/VOL+ DOWN/VOL- SETTING Increase Bass/treble level by 1 step. hold Time < In setting menu, change the 1s 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 radio setting menu, change the current parameter automatically. In radio working mode, increase volume level automatically until to maximum. In setting menu, change the current time/alarm parameter automatically. hold Time < In setting menu, change the 1s 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 radio setting menu, change the current parameter automatically. In radio working mode, decrease volume level automatically until to minimum. In setting menu, change the current time/alarm parameter automatically. hold Time < None 1s In radio setting menu, change the selected item per each press. hold Time > 1s Quickly return to FM working mode. None Rev. 0.1 7 Si4822/26-DEMO 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 µs Default: 75 µs Channel space: 9 or 10 kHz Default: 9 kHz Tone/VOL mode: a-d Default: d Tuning preference: a-d Default: b 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 effect, volume levels from 0 to 63 Mixed mode 1: bass/treble and digital volume coexist, 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. 8 Rev. 0.1 Si4822/26-DEMO 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 battery compartment. The board will automatically 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 set 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 setting 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 enable 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 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 the alarm 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 enabled and the alarm setting time is matched, the radio 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 operation on the push buttons, the autosleep function will be disabled. The radio keeps working throughout this time. Rev. 0.1 9 Si4822/26-DEMO 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 band: 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 value via the MCU. S13 determines which method is in use. If you use the tuner default values, the band property is fixed 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 method, set S14 to use the slide switch or push button. 2. According to the desired radio band property, set S13 to use tuner default values or reconfigure the band property. 3. Hold the POWER/BAND push button (hold time > 1s) or when the alarm time is reached, the device will enter FM/AM/SW mode. 4. Use slide switch S2 or press the POWER/BAND push button to select the desired band. 5. Refer to section "4.2.1. MCU Setting 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. Press 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 connected 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. 10 Rev. 0.1 Si4822/26-DEMO 4.2.1. MCU Setting Band Property The demo board provides the function that the band property can be set by the MCU. The band property includes: Band top bottom De-emphasis (only for FM) Channel Space (only for AM) The setting menu is illustrated in Figure 4. Band 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 automatically 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 automatically 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 µs or 75 µs. 6. In AM working mode, press the DE/SPC button to set the Channel Space 9 kHz or 10 kHz. S E T T IN G M E N U : 1 BAND TO P 2 BAND BO TTO M 3 T O N E /V O L M O D E a B a s s /T re b le M O D E 4 T u n in g p re fe re n c e b D ig -V o l M O D E c M IX M O D E 1 d M IX M O D E 2 a p re fe re n c e 1 b p re fe re n c e 2 Figure 4. Setting Menu Rev. 0.1 11 Si4822/26-DEMO 4.2.2. MCU Setting Radio Working Mode The host MCU can set the radio working mode. The working mode includes: Tone/volume mode (only for FM mode), item 3 in setting menu preference (only for FM and SW), item 4 in setting menu To set radio working mode, follow these steps: Tuning 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 automatically quits the setting menu if there is no operation within 3 seconds. 12 Rev. 0.1 Si4822/26-DEMO 5. Bill of Materials ATDD AM/FM/SW receiver IC Si4822/26 with external 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 1 12 C1-2 C6 C19 C24 C37-42 C44 CAP,SM,0603,X7R 0.1 µ 2 2 C5 C36 CAP,SM,0603,X7R 0.47 µ 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 µ 10 2 C4 C12 CAP,SM,0603,X7R 10 µ 11 1 C13 CAP,SM,1210,X7R 47 µ 12 1 C18 CAP,SM,0603,X7R 820 p 13 2 C23 C27 CAP,SM,1210,X7R 220 µ 14 2 C14 C25 Electrolytic capacitor 100 µ/4 V 15 1 C3 Electrolytic capacitor 220 µ/4 V 16 2 R5-6 RES,SM,0603 2k 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 1M 24 2 R4 R31 RES,SM,0603 1k 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% Rev. 0.1 Value 13 Si4822/26-DEMO Table 3. Si4822/26-DEMO Board Bill of Materials Rev 1.0 (Continued) Item Qty 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 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 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 54 1 LCD1 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 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 14 Reference Description Value Si4822/26 LED CONN,TH,1x2,HDR LCD Rev. 0.1 220 µH 2.5k/100M B6 LNA_EN [1] R34 100k 33n C30 R41 120k C31 33n R32 10R 10p R31 1k C33 S11 Q1 2SC9018 VCC D2 BAV99 RESET [2] 0.47u C5 J6 12 Rev. 0.1 11 2k R6 C34 33p 47u C13 100R R27 0.1u C1 VR1 100k 10% C28 22p 32.768KHz Y1 C15 C29 22p R21 NC 0.1u 4.7u C6 2 U1 1 3 [2] IRQ [1] LNA_EN 10k R42 [2] XTALI TP1 Si4822/26-A S13 [1] TUNE1 VCC C4 10u C39 0.1u VCC L3 120nH C14 100u/4V 10u C12 2-1 MCU Setting 2-3 Tuner default S13: Band property BAT1 AAA*2 R16 2k2 820p C18 12k R22 R5 2k 4 3 2 1 U2 C11 LM4910MA GND SHUTDOWN IN2 IN1 R20 C25 100u/6.3V VDD VO3 VO2 VO1 330p 6k8 5 6 7 8 C24 0.1u C27 220u C23 220u C10 100p Aout GND C8 100p B4 2k5/100M B5 2k5/100M Test point TP3 NC B1 1 2 3 [1] FMI Audio output J5 BAND [1] 2-1 push button 2-3 slide switch S14 2 S14: Band Selection Figure 5. Si4822/26-DEMO Board Rev 1.0 Schematic—Radio and Audio Portions 10k R3 C19 0.1u S12 [1] FMI 9 L1 0R/120nH 2 IRQ C36 0.47u MW VCC 10 AMI GND 13 NC GND 14 NC 8 FMI RFGND 7 SDIO 17 SCLK [2] RST 15 6 SCLK 16 SDIO [2] 1 LNA_EN [1] BAND 5 NC 18 XTALO 4 NC 19 XTALI 3 BAND VDD1 20 TUNE2 VDD2 21 TUNE1 DBYP 22 NC 23 AOUT 24 ANT1 MW ferrite antenna VCC J1 VR2-A D4 BAV99 [2] SHUTDOWN VCC FM/SW 3 1 VCC 1 S2 2 3 4 5 6 7 8 9 10 11 12 13 TUNE1 [1] R44 47k 1% R33 20k 1% R29 160k 1% 20k 1% R28 10k 1% R7 40k 1% R8 R9 20k 1% R14 20k 1% R11 20k 1% R12 20k 1% R10 20k 1% R15 20k 1% R35 20k 1% R43 30k 1% R36 33k 1% FM1 (87MHz - 108MHz) FM5 (64MHz - 87MHz) AM1 (520kHz - 1710kHz) 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) Si4822/26-DEMO 6. Schematics and Gerber 15 Rev. 0.1 [2] [2] [2] [2] [2] [2] KEY_C0 KEY_C1 KEY_C2 KEY_C3 KEY_R0 KEY_R1 XTALI [1] Y2 32.768KHz C42 0.1u RESET VCC C40 0.1u LCD_C1 [2] LCD_C2 [2] C37 0.1u VCC C35 22p C32 22p VCC S1 S7 11 10 9 8 7 6 5 4 3 2 1 S3 S10 DE/SPC DOWN/VOL- KEY TREBLE/AL S6 BASS/TMR R24 [1] SHUTDOWN [2] LCD_S13 23 24 25 26 27 28 29 30 31 32 1 BAND TOP 2 BAND BOTTOM 3 TONE/VOL MODE 4 Tuning preference SETTING MENU: SEG9(K9) SEG10(K10) SEG11(K11) SEG12(K12) SEG21 SEG22 SEG23 SEG24/IOA1 SEG25/IOA2 SEG26/IOA3 33 200R SEG27/IOA4 D1 Tuning indicator [1] [2] [2] [2] [2] [2] [2] [2] [1] [1] SCLK a preference1 b preference2 a Bass/Treble MODE b Dig-Vol MODE c MIX MODE1 d MIX MODE2 LCD_S6 LCD_S7 LCD_S8 LCD_S9 LCD_S10 LCD_S11 LCD_S12 SDIO RESET BZ [2] C2 0.1u 1k R4 C3 220u/4V Q2 2N3904 BZ1 BUZZER D6 1N4148 R13 22R VCC [2] LCD_S2 [2] LCD_S1 FM MW SW [2] LCD_S5 [2] LCD_S4 [2] LCD_S3 VCC [2] KEY_C0 LCD Figure 6. Si4822/26-DEMO Board Gerber Rev 1.0 Schematic—MCU Portion SETTING [2] KEY_C3 POWER/BAND S5 [2] KEY_C1 MCU S4 COM2 COM1 CUP2 CUP1 VDD3 VDD2 VDD1 GND XOUT XIN BAK U3 IRQ [1] Q3 2N3906 S8 UP/VOL+ C38 0.1u C44 0.1u R2 1M 12 [2] KEY_C2 [2] 37 R1 1M 44 TEST 43 13 COM3 42 INT COM4 14 RESET COM5 LCD_C3 15 40 SEG34/IOC3/KI3 41 SEG35/IOC4/KI4 SEG1(K1) 38 SEG32/IOC1/KI1 SEG4(K4) 39 SEG33/IOC2/KI2 SEG3(K3) 17 SEG2(K2) [2] 18 [2] LCD_S0 19 [2] LCD_S1 16 [2] KEY_R1 KEY_R0 [2] BZ SEG31/IOB4/BZ SEG5(K5) 35 SEG29/IOB2/ELP SEG7(K7) 34 SEG28/IOB1/ELC SEG8(K8) 36 SEG30/IOB3/BZB SEG6(K6) [2] 21 [2] 22 [2] LCD_S5 20 [2] LCD_S3 LCD_S2 [2] LCD_C1 1 COM1 [2] LCD_C2 2 COM2 [2] LCD_C3 3 COM3 [2] LCD_S0 4 SEG0 5 SEG1 6 SEG2 7 SEG3 8 SEG4 9 SEG5 [2] LCD_S6 10 SEG6 [2] LCD_S7 11 SEG7 [2] LCD_S8 APPD DRAWN MODEL NO SLEEP 12 SEG8 [2] LCD_S9 13 SEG9 [2] LCD_S10 14 SEG10 [2] LCD_S11 15 [2] LCD_S12 LCD1 DATE DATE DIVISION SI4822/26-DEMO Jing Wang MHz KHz MHz PM SEG11 [2] LCD_S13 17 SEG13 16 SEG12 16 LCD_S4 C41 0.1u October.24.20 Si4822/26-DEMO Figure 7. Si4822/26-DEMO Board Gerber Rev 1.0 Si4822/26-DEMO Rev. 0.1 17 Smart. Connected. Energy-Friendly Products Quality Support and Community www.silabs.com/products www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. 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