MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor 4 Stereo Inputs and 1 Stereo Output Volume, Tone, Balance, Loudness and Selectable Input Gain FEATURES APPLICATIONS •Operation range : 2.7V~6.5V •4 stereo inputs with selectable input gain •2 independent speaker controls for balance •Tone controls (treble and bass) •Loudness and independent mute function •Volume control in 1.25 dB/step •I2C interface •Components less and good PSRR •Housed in SOP28, SSOP28 package •Portable audio device •Car stereo audio •Hi-Fi audio system DESCRIPTION The MS6714 is a 4 stereo inputs/2-channel outputs digital control audio processor for the low voltage operation. Volume, tone (bass and treble), and balance (left/right) processor are incorporated into a single chip. The MS6714 also has the loudness function and selectable input gain. These functions can be built a Hi-Fi audio system easily. All functions are programmable via the serial I2C bus. The default states of the chip as the power is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage, the bass and the treble are 0dB. BLOCK DIAGRAM LOUT 18 LIN LOUD_L BOUT_L BIN_L 17 12 20 19 TREB_L 3 RB LIN1 LIN2 LIN3 LIN4 RIN4 RIN3 RIN2 RIN1 16 15 14 13 Volume & Londness Input Selector & Gain Control 8 9 10 11 Mute 24 OUT_L Bass Treble Speaker ATT 27 SCL 26 SDA 25 DGND Serial Bus Decoder and Latches Volume & Londness Bass Treble Speaker ATT 23 OUT_R Mute RB Supply 1 2 28 6 AVDD AGND REF ROUT REV 3 5 7 22 21 RIN LOUD_R BOUT_R BIN_R 1/18 4 TREB_R www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor PIN CONFIGURATION Symbol VDD Pin 1 AGND TREB_L 2 3 Description Supply Input Voltage Analog Ground Left Channel Input for Treble Controller TREB_R 4 Right Channel Input for Treble Controller RIN ROUT 5 6 Audio Processor Right Channel Input Gain Output and Input Selector for Right Channel LOUD_R RIN4 7 8 Right Channel Loudness Input Right Channel Input 4 RIN3 RIN2 9 10 Right Channel Input 3 Right Channel Input 2 RIN1 11 Right Channel Input 1 LOUD_L LIN4 12 13 Left Channel Loudness Input Left Channel Input 4 LIN3 LIN2 14 15 Left Channel Input 3 Left Channel Input 2 LIN1 16 LIN LOUT VDD 1 28 REF AGND 2 27 SCL TREB_L 3 26 SDA TREB_R 4 25 DGND RIN 5 24 OUT_L ROUT 6 23 OUT_R LOUD_R 7 MS6714 22 BOUT_R RIN4 8 21 BIN_R RIN3 9 20 BOUT_L Left Channel Input 1 RIN2 10 19 BIN_L 17 18 Audio Processor Left Channel Input Gain Output and Input Selector for Left Channel RIN1 11 18 LOUT BIN_L BOUT_L 19 20 Left Bass Controller Input Channel Left Bass Controller Output Channel BIN_R BOUT_R 21 22 Right Bass Controller Input Channel Right Bass Controller Output Channel OUT_R 23 Right Speaker Output OUT_L DGND 24 25 Left Speaker Output Digital Ground SDA 26 I2C Data Input SCL 27 REF 28 I2C Clock Input Analog Reference Voltage（1/2VDD） REV 3 2/18 LOUD_L 12 17 LIN LIN4 13 16 LIN1 LIN3 14 15 LIN2 SOP28 / SSOP28 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor ORDERING INFORMATION Package Part number Packaging Marking Transport Media 28-Pin SOP (lead free) MS6714GTR MS6714G 1k Units Tape and Reel 28-Pin SOP (lead free) MS6714GU MS6714G 25 Units Tube 28-Pin SSOP (lead free) MS6714SSGTR MS6714G 2.5k Units Tape and Reel 28-Pin SSOP (lead free) RoHS Compliance MS6714SSGU MS6714G 50 Units Tube ABSOLUTE MAXIMUM RATINGS Symbol Parameter VDD Supply Voltage VESD Electrostatic Handling TSTG Rating Unit 6.5 V -3000 to 3000 V Storage Temperature Range -65 to 150 ℃ TA Operating Ambient Temperature Range -40 to 85 ℃ TJ Maximum Junction Temperature 150 ℃ TS Soldering Temperature, 10 seconds 260 ℃ RTHJA Thermal Resistance from Junction to Ambient in Free Air SOP28 SSOP28 210 210 ℃/W OPERATING RATINGS Symbol VDD REV 3 Parameter Supply Voltage 3/18 Min Typ Max Unit 2.7 - 6.5 V www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor 5V ELECTRICAL CHARACTERISTICS (Ta=25℃, All stages 0dB, f=1kHz, CREF =22uF, refer to the application circuit; unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit Supply IQ Quiescent Current VIN=0V - 12.2 12.5 mA PSRR Power Supply Rejection Ratio CREF = 22uF, f = 100Hz 55 60 - dB Input Selectors RIN Input Resistance Input 1,2,3,4 35 50 70 kΩ GIN Input Gain Range Gain 0 - 11.25 dB GSTEP Step Resolution - 3.75 - dB ERRG Gain Setting error -0.2 0 0.2 dB LOUD Loudness 19 20 - dB -78.75 - 0 dB - 1.25 - dB -0.5 0 1 dB -1 0 5 dB -37.5 - 0 dB - 1.25 - dB -0.2 0 0.1 dB - -65 -60 dB Boost/Cut -14 - 14 dB - 2 - dB f =100Hz -0.3 0 0.1 dB 34 44 58 kΩ Boost/Cut -14 - 14 dB CLoud=100nF, f =20Hz Volume=-40dB Volume control CRVOL Volume Control Range RESVOL Volume Step Resolution ERRVOL Volume Setting Error Attenuation Av = 0 to -40dB Av = -40 to -60dB Speaker Attenuators CRSPK Speaker Control Range RESSPK Speaker Step Resolution ERRSPK Speaker Setting Error MUTE Output Mute Attenuation Attenuation Bass Control CRBAS Bass Control Range RESBAS Bass Step Resolution ERRBAS Speaker Setting Error RB Internal Feedback Resistance Treble Control CRBAS Treble Control Range RESBAS Treble Step Resolution - 2 - dB ERRBAS Treble Setting Error f =20kHz -0.3 0 0.1 dB VOMAX Maximum Output Voltage Swing (THD+N)/S <0.3% 4.3 - - Vpp THD+N Total Harmonic Distortion Plus Noise VOUT=2Vpp - -75 0.0177 - dB % S/N Signal-to-Noise Ratio VOUT=4Vpp - 97 - dB CS Channel Separation Left/Right 93 97 - dB VIH Bus High Input Level 2 - - V VIL Bus Low Input Level - - 0.8 V General Bus Input Notes: Bass and Treble response see to curve. The center frequency and quality of the response behavior can be chosen by the external. REV 3 4/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor 2.7V ELECTRICAL CHARACTERISTICS (Ta=25℃, All stages 0dB, f=1kHz, CREF =22uF, refer to the application circuit; unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit Supply IQ Quiescent Current VIN=0V PSRR Power Supply Rejection Ratio CREF = 22uF, f = 100Hz VOMAX Maximum Output Voltage Swing (THD+N)/S <0.3% THD+N Total Harmonic Distortion Plus Noise VOUT=2Vpp S/N Signal-to-Noise Ratio VOUT=2.5Vpp CS Channel Separation Left/Right - 8.7 9 mA 53 58 - dB - 2.5 - Vpp - -50 - dB General - 0.3 - % 90 94 - dB 90 94 - dB TYPICAL PERFORMANCE CHARACTERISTICS (Ta=25℃, All stages 0dB, f=1kHz, CREF =22uF, refer to the application circuit; unless otherwise specified) VDD=5V Volume=-40dB VDD=5V Loud (dB) Loud (dB) Loud (dB) 100nF OPEN 33nF 10nF 220nF Loudness OFF 56nF VDD=5V CLOUD = 100nF Loudness vs. Volume Loudness vs. Frequency vs. Volume Loudness vs. External Capacitors VDD=5V Treble=Bass= -14~14dB REV 3 VDD=2.7V VIN=-3dBV VDD=5V VIN=0dBV QUIESCENT CURRENT (mA) FREQUENCY (Hz) CHANNEL SEPARATION (dB) FREQUENCY (Hz) Tone (dB) FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) SUPPLY VOLTAGE (V) Typical Tone Response Channel Separation vs. Frequency Quiescent Current vs. Supply Voltage 5/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor VDD=2.7V VO=2Vpp THD+N (%) THD+N (%) THD+N (%) f=1kHz f=20kHz f=20Hz VDD=5V VO=2Vpp f=20kHz f=1kHz VDD=5V VDD=2.7V FREQUENCY (Hz) OUTPUT VOLTAGE (dBV) OUTPUT VOLTAGE (dBV) THD+N vs. Frequency THD+N vs. Output Voltage THD+N vs. Output Voltage CAP=22uF CAP=10uF VDD=5V VRR=-20dBV PSRR (dB) PSRR (dB) CAP=22uF REV 3 f=20Hz CAP=10uF VDD=2.7V VRR=-20dBV FREQUENCY (Hz) FREQUENCY (Hz) PSRR vs. Frequency PSRR vs. Frequency 6/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor I2C BUS DESCRIPTION Start and Stop Conditions A start condition is activated when the SCL is set to HIGH and SDA shifts from HIGH to LOW state. The stop condition is activated when SCL is set to HIGH and SDA shifts from LOW to HIGH state. Please refer to the timing diagram below. SCL SDA Stop Start SCL : Serial Clock Line, SDA : Serial Data Line Data Validity A data on the SDA line is considered valid and stable only when the SCL signal is in HIGH state. The HIGH and LOW states of the SDA line can only change when the SCL signal is LOW. Please refer to the figure below. SDA SCL Data line stable, Data valid Data change allowed Byte Format Every byte transmitted to the SDA line consists of 8 bits. Each byte must be followed by an acknowledge bit. The MSB is transmitted first. Acknowledge During the Acknowledge clock pulse, the master (up) put a resistive HIGH level on the SDA line. The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during the Acknowledge clock pulse so that the SDA line is in a stable LOW state during this clock pulse. Please refer to the diagram below. SCL 1 2 3 7 8 9 SDA MSB Acknowledge Start The audio processor that has been addressed has to generate an Acknowledge after receiving each byte, otherwise, the SDA line will remain at the HIGH level during the ninth (9th) clock pulse. In this case, the master transmitter can generate the STOP information in order to abort the transfer. REV 3 7/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor Timing of SDA and SCL Bus Lines SDA tf tLOW SCL S tHD;STA tSU;DAT tr tHD;DAT Standard Mode Symbol fSCL tHD;STA tf tHIGH tSU;STA tSP tSU;STO Sr Parameter tBUF tr P S Min Max Unit 0 100 kHz 4.0 - us tLOW SCL clock frequency Hold time (repeated) START condition. After this period, the first clock pulse is generated LOW period of the SCL clock 4.7 - us tHIGH HIGH period of the SCL clock 4.0 - us tSU:STA 4.7 - us 0 3.45 us tSU:DAT Set-up time for a repeated START condition Data hold time: For I2C-bus devices Data-set-up time 250 - ns tr Rise time of both SDA and SCL signals - 1000 ns tf Fall time of both SDA and SCL signals - 300 ns tSU:STO Set-up time for STOP condition 4.0 - us tBUF Bus free time between a STOP and START condition 4.7 - us Cb Capacitive load for each bus line - 400 pF VnL Noise margin at the LOW level for each connected device (including 0.1VDD hysteresis) - V VnH Noise margin at the HIGH level for each connected device (including 0.2VDD hysteresis) - V tHD:STA tHD:DAT BUS INTERFACE Data are transmitted to and from the MCU to the MS6714 via the SDA and SCL. The SDA and SCL make up the BUS interface. It should be noted that pull-up resistors must be connected to the positive supply voltage. VDD Rp Rp Pull up resistors SDA (Serial Data Line) SCL (Serial Clock Line) MCU REV 3 MS6714 8/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor Interface Protocol The format consists of the following •A START condition •A chip address byte including the MS6714 address. (7bits) •The 8th bit of the byte must be “0”.(write=0, read=1) •MS6714 must always acknowledge the end of each transmitted byte. •A data sequence (N-bytes + Acknowledge) •A STOP condition SDA SCL 1-7 8 ADDRESS W R / -- 9 1-7 8 9 1-7 8 9 S P START CONDITION ACK DATA ACK DATA ACK STOP CONDITION Address Code The chip address of the MS6714 is 88H. 1 0 0 0 1 0 0 0 7 bits address W MS6714 address Data Bytes Description The default states of the chip as the power is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage, the bass and the treble are 0dB. MSB LSB Function Volume Control 0 0 B2 B1 B0 A2 A1 A0 1 1 0 B1 B0 A2 A1 A0 Speaker ATT L 1 1 1 B1 B0 A2 A1 A0 Speaker ATT R 0 1 0 G1 G0 S2 S1 S0 Audio Switch 0 1 1 0 C3 C2 C1 C0 Bass Control 0 1 1 1 C3 C2 C1 C0 Treble Control Where Ax = 1.25dB steps; Bx = 10dB steps; Cx = 2dB steps; Gx = 3.75dB steps REV 3 9/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor Volume MSB 0 0 0 0 B2 B1 B0 LSB Function A2 A1 A0 Volume 1.25 dB steps 0 0 0 0 0 0 1 -1.25 0 1 0 -2.5 0 1 1 -3.75 1 0 0 -5 1 0 1 -6.25 1 1 0 -7.5 1 1 1 -8.75 A2 A1 A0 Volume 10dB steps B2 B1 B0 0 0 0 0 0 0 1 -10 0 1 0 -20 0 1 1 -30 1 0 0 -40 1 0 1 -50 1 1 0 -60 1 1 1 -70 The default volume is –78.75dB. Speaker Attenuator MSB LSB Function（ （dB） ） 1 1 0 B1 B0 A2 A1 A0 Speaker ATT L 1 1 1 B1 B0 A2 A1 A0 Speaker ATT R 0 0 0 0 0 0 1 -1.25 0 1 0 -2.5 0 1 1 -3.75 1 0 0 -5 1 0 1 -6.25 1 1 0 -7.5 1 1 1 -8.75 0 0 0 0 1 -10 1 0 -20 1 1 -30 1 1 1 1 1 Mute LF: Left Front, RF: Right Front, LR: Left Rear, RR: Right Rear The default state is mute. REV 3 10/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor Audio Switch LSB Function S1 S0 Audio Switch 0 0 Stereo 1 0 1 Stereo 2 1 0 Stereo 3 1 1 Stereo 4 MSB 0 1 0 G1 G0 S2 0 Loudness ON 1 Loudness OFF 0 0 +11.25dB 0 1 +7.5dB 1 0 +3.75dB 1 1 0dB The default state is stereo 4, loudness off and gain 0dB. Bass and Treble MSB LSB Function（ （dB） ） 0 1 1 0 C3 C2 C1 C0 Bass 0 1 1 1 C3 C2 C1 C0 Treble 0 0 0 0 -14 0 0 0 1 -12 0 0 1 0 -10 0 0 1 1 -8 0 1 0 0 -6 0 1 0 1 -4 0 1 1 0 -2 0 1 1 1 0 1 0 0 0 0 1 0 0 1 2 1 0 1 0 4 1 0 1 1 6 1 1 0 0 8 1 1 0 1 10 1 1 1 0 12 1 1 1 1 14 The default state is bass 0dB and treble 0dB. REV 3 11/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor Examples Set Volume at –37.5dB. MSB Start Data byte LSB MS6714 Address ACK 0 0 0 1 1 1 -30dB 1 0 ACK Stop 0 ACK Stop 1 1 ACK Stop 0 1 ACK Stop ACK Stop -7.5dB Set Speaker Right at –30dB. MSB Start Data byte LSB MS6714 Address ACK 1 1 1 1 Speaker R 1 0 -30dB 0 0dB Set Speaker Left in mute-on. MSB Start Data byte LSB MS6714 Address ACK 1 1 0 1 1 Speaker L 1 Mute Set Stereo 2 Input with gain of +7.5 dB and Loudness on. MSB Start Data byte LSB MS6714 Address ACK 0 1 0 0 1 0 +7.5dB Stereo 2 Loudness ON Set treble at -10dB. MSB Start MS6714 Address Data byte LSB ACK 0 1 1 Treble REV 3 1 0 0 1 0 -10dB 12/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor APPLICATION INFORMATION Basic Application Example 5.6K 2.2u MCU 100n 100n 25 13 8 2.7n 3 TREB_L 9 100n 19 BIN_L 14 20 BOUT_L INPUT 12 LOUD_L 10 17 LIN 15 18 LOUT 11 27 SCL 16 SDA DGND 2.2u 26 LIN1 RIN1 LIN2 RIN2 10u OUT_L MS6714 LIN3 RIN3 24 10u OUT_R OUTPUT 23 LIN4 RIN4 7 AVDD 22 100n TREB_R 5 22u BIN_R 6 BOUT_R 28 RIN ROUT 2 REF AGND AVDD 1 LOUD_R 2.2u 21 100n 100n 4 2.7n 2.2u 5.6K REV 3 13/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor EXTERNAL DIMENSIONS SOP28 (300mil) D Detail A E H h x45 C A e B A1 0.25mm θ Detail A Dimension in mm L Dimension in inch Symbol Min Min Max A 2.35 2.65 0.0926 0.1043 A1 0.10 0.30 0.0040 0.0118 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.0091 0.0125 e REV 3 Max 1.27 BASIC 0.050 BASIC E 7.40 7.60 0.2914 0.2992 H 10.00 10.65 0.394 0.419 L 0.40 1.27 0.016 0.050 D 17.70 18.10 0.6969 0.7125 h θ 0.25 0.75 0.010 0.029 0 o 8 o 14/18 0 o 8o www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor SSOP28 D Detail A E1 E H x45 c ZD θ2 θ1 A2 A R1 e L1 b R A1 θ L Detail A Dimension in mm Dimension in inch Symbol Min Min NOM Max A 1.35 1.63 1.75 0.053 0.064 0.069 A1 0.10 0.15 0.25 0.004 0.006 0.010 A2 - - 1.50 - - 0.059 b 0.20 - 0.30 0.008 - 0.012 c 0.18 - 0.25 0.007 - 0.010 e 0.635 BASIC 0.025 BASIC D 9.8 9.91 10.01 0.388 0.390 0.394 E 5.79 5.99 6.20 0.228 0.236 0.244 E1 3.81 3.91 3.99 0.150 0.154 0.157 L 0.41 0.635 1.27 0.016 0.025 0.050 h 0.25 - 0.50 0.010 - 0.020 ZD REV 3 Max NOM 0.838REF 0.033REF R1 0.20 - 0.33 0.008 - R 0.20 - - 0.008 - - θ 0o - 8o 0o - 8o θ1 0o - -0o - θ2 o 5 10 o 15 15/18 o 5 o 10 0.013 o 15o www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor DEMO BOARD The demo board used IR technique controller to control the MS6714. The default states of demo board are Stereo 4, Input Gain 0dB, Volume –20dB, Attenuator Speakers 0dB, Loudness Off, Bass 0dB and Treble 0dB. 5 2 3 1 1 4 Label 1: Supply Voltage The AVDD and DVDD should be the same supply voltage, the supply range is 2.7 ~ 6.5 VDC. Label 2: LED Indicator The LED indicates the power status and the IR received status. It is red-dark blink once when the MCU has received the function code correctly. Label 3: Output Section Please connected to a post-power-amplifier, as active speaker. Label 4: Input Section There are four stereo inputs in the section. Please input stereo audio signal, as music or sine wave. Label 5: MCU Reset The MS6714 will be loaded the default values by MCU. The default states of demo board are Stereo 4, Input Gain 0dB, Volume –20dB, Attenuator Speakers 0dB, Loudness Off, Bass 0dB and Treble 0dB. REV 3 16/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor IR Controller IN1, IN2, IN3, IN4 : Select Stereo Input. IN1, 2, 3, 4 represents Stereo Input 1, 2, 3, 4. VOL+, VOL- : The volume control keys. The volume control in 1.5dB/step as the switch is pressed once, the range is –79dB to 0dB. Gain+, Gain- : The gain control keys for stereo input. The gain control in 3.75dB/step as the switch is pressed once, the range is 0dB to 11.25dB. ATTL+, ATTL- : The attenuation control keys for left speaker output. The attenuation in 1.25dB/step as the switch is pressed once, the range is -37.5dB to 0dB. ATTR+, ATTR- : The attenuation control keys for right speaker output. The attenuation in 1.25dB/step as the switch is pressed once, the range is -37.5dB to 0dB. TRE+, TRE- : The treble control keys. The treble control in 2dB/step as the switch is pressed once, the range is –14dB to 14dB. BAS+, BAS- : The bass control keys. The bass control in 2dB/step as the switch is pressed once, the range is -14dB to 14dB. Loud : The loudness key Press the key once to set loudness on or loudness off. Mute : The mute key controls all speaker outputs Press the key once to set mute-on or mute-off. REV 3 17/18 www.mosanalog.com MS6714 MOSA 4 Stereo Inputs / 1 Stereo Output Audio Processor Circuit J1 + DVCC C4 0.1u RX TX + C3 10u S1 R2 1K RST R4 1 2 3 4 5 6 7 8 9 10 + IR_IN Y1 12M SCL SDA C7 2 1 + 20P 1 2 3 4 5 6 7 8 9 INPUT AVDD 20 19 18 17 16 15 14 13 12 11 IR_IN GND 1 IR + C5 470p IR D1 Power J4 C19 + C12 2.2u + 10u C14 + J9 10u C15 VDD AGND TREB_L TREB_R RIN ROUT LOUD_R RIN4 RIN3 RIN2 RIN1 LOUD_L LIN4 LIN3 + MS6714 + + + C28 C29 2.7n 2.7n + + C30 0.1u C31 0.1u OUT REF SCL SDA DGND OUT_L OUT_R BOUT_R BIN_R BOUT_L BIN_L LOUT LIN LIN1 LIN2 C27 28 27 R22 R21 26 25 24 23 22 21 20 19 18 C26 2.2u 17 16 15 22u 10K 10K SCL SDA 10u 10u C8 J6 C11 FRONT_OUT + 1 2 3 4 5 6 7 8 9 10 11 12 13 14 10u + 10u C13 10u C16 Vcc P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 P3.7 AT89X51 U2 J8 IN3 RST P3.0 P3.1 XTAL2 XTAL1 P3.2 P3.3 P3.4 P3.5 GND 1 2 3 J5 AVDD(6V) IN4 VS U1 RX TX 10K 20P 0.1u J2 3 + C6 C9 + + 2 LCD J7 C2 47u R3 10K + 1 2 3 220 + C1 10u + J3 R1 DVCC(3V) 1 2 C20 C21 + + C22 + C23 + 0.1u 0.1u 0.1u 0.1u R5 5.6K R6 5.6K J10 10u C17 + 10u C18 + IN2 J11 10u C24 + 10u C25 + IN1 W1 Jumper REV 3 18/18 www.mosanalog.com