MS6864_1

MOSA MS6864 Dual 2W Power Amplifiers with Volume Control Dual 2W Power Amplifier, I2C interface Stereo Input with Volume Control FEATURES •Operation range: 2.4V ~ 6.5V •Volume control range Gain: 0 to 21dB, 3dB/step Attenuation: 0 to -77.5dB, 1.25dB/step •Output mode : Speaker( BTL)/Headphone(SE) •BTL Output power RL=4 , 2W at 5V, 0.8W at 3.3V, 360mW at 2.4V RL=8 , 1.3W at 5V, 0.53W at 3.3V, 250mW at 2.4V •SE Output power RL=32 , 93mW at 5V, 35mW at 3.3V, 15mW at 2.4V •Control interface : I2C •Excellent Power Supply Rejection Ratio(PSRR) •Flexibility power management •Component less •Reduce pop noise circuit •Housed in TSSOP16(enhanced thermal PAD) , SSOP20(209mils) package APPLICATIONS Multimedia system, Portable Digital Audio. DESCRIPTION The MS6864 is low distortion stereo power amplifier (SE/BTL) integrated volume control. It can drive 2W of continuous average power into a dual 4 bridged-tied (BTL) speaker or 2 * 90mW into stereo 32 single ended (SE) headphone. The volume control offers wide range of gain and attenuation for stereo input. All of the functions are easy setting that can be set by I2C interface. The MS6864 has good features for portable equipment, including wide voltage operation 2.4V~6.5V, low power consumption, power management, component less, make the MS6864 ideally suitable for use in the portable digital audio equipments. BLOCK DIAGRAM REV 2 1/21 www.mosanalog.com MOSA PIN CONFIGURATION Symbol VSS CAP RIN AVSS OUTRPVDDR OUTR+ PVSSR PVSSL OUTL+ PVDDL OUTLAVDD LIN SDA Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Description Connected to ground Capacitor connected Right channel input Negative supply voltage SE right channel output or negative output of BTL right channel Positive supply voltage for right channel of power amplifier Positive output of BTL right channel Negative supply voltage for right channel of power amplifier Negative supply voltage for left channel of power amplifier Positive output of BTL left channel Positive supply voltage for left channel of power amplifier SE left channel output or negative output of BTL left channel Positive supply voltage Left channel input I2C data input MS6864 Dual 2W Power Amplifiers with Volume Control VSS 1 CAP 2 RIN 3 AVSS 4 OUTR- 5 PVDDR 6 OUTR+ 7 PVSSR 8 Thermal Pad 16 SCL 15 SDA 14 LIN 13 AVDD 12 OUTL11 PVDDL 10 OUTL+ 9 PVSSL MS6864, TSSOP16 SCL 16 I2C clock input Note: 1. SE: Single Ended. BTL: Bridged-Tied Load Symbol VSS NC CAP RIN AVSS OUTRPVDDR OUTR+ PVSSR PVSSL OUTL+ PVDDL OUTLAVDD LIN SDA Pin 9,12 3 4 5 6 7 8 10 11 13 14 15 16 17 18 No Connect Capacitor connected Right channel input Negative supply voltage SE right channel output or negative output of BTL right channel Positive supply voltage for right channel of power amplifier Positive output of BTL right channel Negative supply voltage for right channel of power amplifier Negative supply voltage for left channel of power amplifier Positive output of BTL left channel Positive supply voltage for left channel of power amplifier SE left channel output or negative output of BTL left channel Positive supply voltage Left channel input I2C data input Vss Vss CAP RIN AVSS OUTRPVDDR OUTR+ NC 1 2 3 4 5 6 7 8 9 20 19 18 17 16 15 14 13 12 11 Description 1,2,20 Connected to ground Vss SCL SDA LIN AVDD OUTLPVDDL OUTL+ NC PVSSL PVSSR 10 MS6864, SSOP20(209mils) SCL 19 I2C clock input Note: 1. SE: Single Ended. BTL: Bridged-Tied Load REV 2 2/21 www.mosanalog.com MOSA ORDERING INFORMATION Package 16Pin TSSOP (lead free) 16Pin TSSOP (lead free) 20Pin SSOP (lead free) 20Pin SSOP (lead free) RoHS Compliance Part number MS6864TGTR MS6864TGU MS6864SSGTR MS6864SSGU MS6864G MS6864G MS6864G MS6864G MS6864 Dual 2W Power Amplifiers with Volume Control Packaging Marking Transport Media 2.5k Units Tape and Reel 90 Units Tube 2k Units Tape and Reel 66 Units Tube ABSOLUTE MAXIMUM RATINGS Symbol VDD VESD TSTG TA TJ TS RTHJA Supply voltage Electrostatic handling Storage temperature range Operating ambient temperature range Maximum junction temperature Soldering temperature, 10 seconds Thermal resistance from junction to ambient in free air TSSOP16 (enhanced thermal pad) SSOP20 Parameter Rating 6.5 2000 -65 to 150 -40 to 85 150 260 51 110 Unit V V ℃ ℃ ℃ ℃ ℃/W OPERATING RATINGS Symbol VDD Supply voltage Parameter Min 2.4 Typ 5 Max 6.5 Unit V 5V ELECTRICAL CHARACTERISTICS (Ta=25℃, VDD=5V, VSS=0V, f=1kHz; unless otherwise specified) Symbol DC Characteristics VCAP VDC Voltage at CAP Output DC level All devices are active, BTL IQ Quiescent current All devices are active, SE L-ch (R-ch) PD, BTL L-ch (R-ch) PD, SE IPD ATT GARAN REV 2 Parameter Conditions Min 0.5VDD -0.05 0.5VDD -0.05 - Typ Max 0.5VDD +0.05 0.5VDD +0.05 - Unit 0.5VDD 0.5VDD 10 6.7 5.2 3.4 V V mA Power down current Mute attenuation Gain/Attenuation range All devices power down All devices power down, except CAP=1/2 VDD Gain Attenuation 3/21 - 12 0.3 uA -90 dB dB dB 0 -77.5 - 21 0 www.mosanalog.com MOSA GSTEP ASTEP EGA VI2CH VI2CL Gain step Attenuation step Gain/Attenuation step error Serial interface high input level Serial interface low input level BTL Mode , RL=8Ω CAP=1uF, f=200Hz SE Mode , RL=32Ω CAP=1uF, f=200Hz BTL Mode, RL=8Ω Po=1W SE Mode, RL=32Ω Po=60mW MS6864 Dual 2W Power Amplifiers with Volume Control 2 3 1.25 0.3 0.8 dB dB dB V V AC Characteristics 61 65 78 81 -65 0.0562 93 2 1.3 93m dB dB dB dB dB % dB W W W PSRR Power supply rejection ratio CS Channel separation THD+N S/N Total harmonic distortion plus Noise Signal-to-noise ratio SE mode, RL=32Ω, 75mW SE mode, A-weighting, 75mW BTL Mode, RL = 4Ω THD+N = 1% BTL Mode, RL = 8Ω THD+N = 1% SE Mode, RL = 32Ω THD+N = 0.1% Po Maximum output power PD: Power Down 3.3V ELECTRICAL CHARACTERISTICS (Ta=25℃, VDD=3.3V, VSS=0V, f=1kHz; unless otherwise specified) Symbol DC Characteristics All devices are active, BTL IQ Quiescent current All devices are active, SE L-ch (R-ch) PD, BTL L-ch (R-ch) PD, SE AC Characteristics THD+N Total harmonic distortion plus Noise SE mode, RL=32Ω, 35mW BTL Mode, RL = 4Ω THD+N = 1% BTL Mode, RL = 8Ω THD+N = 1% SE Mode, RL = 32Ω THD+N = 0.1% -65 0.0562 0.8 0.53 35m 60 0.1 dB % W W W 9 6 4.6 3.0 mA Parameter Conditions Min Typ Max Unit Po Maximum output power REV 2 4/21 www.mosanalog.com MOSA 2.4V ELECTRICAL CHARACTERISTICS (Ta=25℃, VDD=2.4V, VSS=0V, f=1kHz; unless otherwise specified) Symbol DC Characteristics Parameter Conditions MS6864 Dual 2W Power Amplifiers with Volume Control Min - Typ 7.6 5.1 4 2.6 -65 0.0562 0.36 0.25 15m Max -60 0.1 - Unit All devices are active, BTL IQ Quiescent current All devices are active, SE L-ch (R-ch) PD, BTL L-ch (R-ch) PD, SE AC Characteristics THD+N Total harmonic distortion plus Noise SE mode, RL=32Ω, 15mW BTL Mode, RL = 4Ω THD+N = 1% BTL Mode, RL = 8Ω THD+N = 1% SE Mode, RL = 32Ω THD+N = 0.1% mA dB % W W W Po Maximum output power REV 2 5/21 www.mosanalog.com MOSA TYPICAL PERFORMANCE CHARACTERISTICS (Ta=25℃; unless otherwise specified) MS6864 Dual 2W Power Amplifiers with Volume Control THD+N (%) VDD=5V, Po=2W BTL mode, RL=4 VDD=3.3V, Po=0.8W BTL mode, RL=4 THD+N (%) THD+N (%) VDD=2.4V, Po=330mW BTL mode, RL=4 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) THD+N vs. frequency THD+N vs. frequency THD+N vs. frequency THD+N (%) THD+N (%) VDD=5V, Po=1.2W BTL mode, RL=8 VDD=3.3V, Po=0.53W BTL mode, RL=8 THD+N (%) VDD=2.4V, Po=250mW BTL mode, RL=8 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) THD+N vs. frequency THD+N vs. frequency THD+N vs. frequency THD+N (%) THD+N (%) VDD=5V, Po=90mW SE mode, RL=32 VDD=3.3V, Po=35mW SE mode, RL=32 THD+N (%) Po=25mW VDD=2.4, Po=15mW SE mode, RL=32 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) THD+N vs. frequency THD+N vs. frequency THD+N vs. frequency REV 2 6/21 www.mosanalog.com MOSA f=20kHz f=20kHz MS6864 Dual 2W Power Amplifiers with Volume Control f=20kHz THD+N (%) THD+N (%) f=1kHz f=1kHz THD+N (%) f=1kHz f=20Hz f=20Hz VDD=5V BTL mode RL=4 VDD=3.3V BTL mode RL=4 f=20Hz VDD=2.4V BTL mode RL=4 OUTPUT POWER (W) OUTPUT POWER (W) OUTPUT POWER (W) THD+N vs. output power THD+N vs. output power THD+N vs. output power f=20kHz f=20kHz f=20kHz THD+N (%) THD+N (%) f=1kHz f=20Hz THD+N (%) f=1kHz f=1kHz f=20Hz f=20Hz VDD=5V BTL mode RL=8 VDD=3.3V BTL mode RL=8 VDD=2.4V BTL mode RL=8 OUTPUT POWER (W) OUTPUT POWER (W) OUTPUT POWER (W) THD+N vs. output power THD+N vs. output power THD+N vs. output power f=20kHz f=20kHz f=20kHz THD+N (%) THD+N (%) f=20Hz f=20Hz f=1kHz THD+N (%) f=20Hz f=1kHz f=1kHz VDD=5V SE mode RL=32 VDD=3.3V SE mode RL=32 VDD=2.4V SE mode RL=32 OUTPUT POWER (W) OUTPUT POWER (W) OUTPUT POWER (W) THD+N vs. output power THD+N vs. output power THD+N vs. output power REV 2 7/21 www.mosanalog.com MOSA MS6864 Dual 2W Power Amplifiers with Volume Control CHANNEL SEPARATION (dB) VDD=5V, Po=1W BTL, RL=8 CHANNEL SEPARATION (dB) VDD=5V, Po=60mW SE, RL=32 FREQUENCY (Hz) FREQUENCY (Hz) Channel separation vs. frequency Channel separation vs. frequency CAP=10uF CAP=10uF CAP=1uF CAP=1uF PSRR (dB) VDD=5V, VRR=200mVrms, BTL RL=8 PSRR (dB) VDD=5V, VRR=200mVrms, SE RL=32 FREQUENCY (Hz) FREQUENCY (Hz) PSRR vs. frequency PSRR vs. frequency All Devices activate. LPD or RPD BTL SE QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) BTL SE SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Quiescent current vs. supply voltage Quiescent current vs. supply voltage REV 2 8/21 www.mosanalog.com MOSA I2C CONTROL INTERFACE MS6864 Dual 2W Power Amplifiers with Volume Control Data are transmitted to and from the MCU and MS6864 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 MS6864 I2C interface protocol The format consists of the following: •A START condition •A chip address byte including the chip address. (7bits) •The 8th bit of the byte must be “0”.(write=0, read=1) •The chip must always acknowledge the end of each transmitted byte. •A data sequence (N-bytes + Acknowledge) •A STOP condition SDA SCL S START CONDITION 1-7 8 9 1-7 8 9 1-7 8 9 P ADDRESS R/W ACK DATA ACK DATA ACK STOP CONDITION I2C chip address 88H 1 0 0 0 1 0 0 0 W 7 bits address REV 2 9/21 www.mosanalog.com MOSA I2C data bytes description MSB 0 0 1 1 1 0 1 0 0 1 B2 B2 0 1 0 B1 B1 G2 G2 1 B0 B0 G1 G1 RPD A2 A2 G0 G0 LPD A1 A1 0 0 PDPR 0 MS6864 Dual 2W Power Amplifiers with Volume Control LSB A0 A0 0 0 CAP PD 0 Function L-ch, Attenuation and Mute R-ch, Attenuation and Mute L-ch, Input Gain R-ch, Input Gain Power Down Mode Output mode (SE/BTL) S/B 0 0 1 1 1 Where Ax = 1.25dB/step; Bx = 10dB/step; Gx = 3dB/step Attenuation and Mute MSB 0 0 0 1 B2 B1 B0 A2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 1 1 A1 0 0 1 1 0 0 1 1 LSB A0 0 1 0 1 0 1 0 1 Function L-ch, Attenuation and Mute R-ch, Attenuation and Mute 0 dB -1.25 dB -2.5 dB -3.75 dB -5 dB -6.25 dB -7.5 dB -8.75 dB 0 dB -10 dB -20 dB -30 dB -40 dB -50 dB -60 dB -70 dB Mute 1 1 1 1 Initial state: Both L-ch and R-ch are mute-on. REV 2 10/21 www.mosanalog.com MOSA Input Gain MSB 1 1 0 0 0 1 G2 0 0 0 0 1 1 1 G1 0 0 1 1 0 0 1 G0 0 1 0 1 0 1 0 0 LSB 0 MS6864 Dual 2W Power Amplifiers with Volume Control Function L-ch, Input Gain R-ch, Input Gain 0 dB 3 dB 6 dB 9 dB 12 dB 15 dB 18 dB 21 dB 1 1 1 Initial state: Both L-ch and R-ch are 0dB gain. Power Down Mode MSB 1 1 0 1 RPD 0 1 0 1 0 1 0 1 LSB CAP LPD PDPR PD Function Power mode selection and power management R-ch PA output is active mode R-ch PA output is power down mode L-ch PA output is active mode L-ch PA output is power down mode Disable preparation for power off Enable preparation for power off Set the voltage of CAP to middle of supply voltage Pull down CAP pin to ground Initial state: All are the power down modes. Enable the power down preparation before the chip will be shut down. Output mode (SE/BTL) MSB 1 1 1 S/B 0 0 0 LSB 0 Function Output mode, mixer control and audio format Output mode is BTL Output mode is SE 0 1 Initial state: Output mode is BTL mode. REV 2 11/21 www.mosanalog.com MOSA I2C Initial code and status MSB 0 0 1 1 1 1 0 1 0 0 1 1 1 1 0 1 0 1 1 1 0 0 1 0 MS6864 Dual 2W Power Amplifiers with Volume Control LSB 1 1 0 0 1 0 Function L-ch, Attenuation and Mute R-ch, Attenuation and Mute L-ch, Input Gain R-ch, Input Gain Power Down Mode Output mode (SE/BTL) Initial status Mute On Mute On 0dB 0dB All devices are power down BTL 1 1 0 0 1 0 1 1 0 0 1 0 1 1 0 0 1 0 I2C CODE EXAMPLE Input gain Set the left channel gain to be 3dB and the right channel gain to be 3dB Gain Start MS6864 Address ACK 1 0 0 0 0 1 0 0 ACK 1 0 1 0 0 1 0 0 ACK Stop L-ch, G = 3dB R-ch, G = 3dB The left and right input channels are independent. Input Attenuation Set the left channel to be -15dB and the right channel to be -30dB -10dB Start MS6864 Address ACK 0 0 0 0 1 1 -5dB 0 0 ACK 0 1 0 -30dB 1 1 0 0dB 0 0 ACK Stop L-ch, Att = -15dB R-ch, Att = -30dB Power down mode Set the L-ch PA output to be active mode. L-ch Start MS6864 Address ACK 1 1 0 1 1 0 1 1 ACK Stop Left PA is active mode Output mode Set the output mode to be BTL mode Output mode Start MS6864 Address ACK 1 1 1 0 0 0 0 0 ACK Stop BTL mode REV 2 12/21 www.mosanalog.com MOSA OPERATION PROCEDURE MS6864 Dual 2W Power Amplifiers with Volume Control The sequence of operation: power on→ active → power down → active → power off. The basic flowcharts are as follows: For HP mode and HP/BTL mode Power On Activating Power Down (Shut Down) Power Off All the Digital Interface Signals Pull Low I2C pull low VDD = GND Setting Input Gain Is Fixed [ Enable Input & Input Gain ] Code: Lch 100xxx00 Rch 101xxx00 Volume Down To Mute Input Channels Mute On [ Attenuation and Mute ] Code: Lch 00111111 (3Fh) Rch 01111111 (7Fh) Volume Down To Mute Input Channels Mute On [ Attenuation and Mute ] Code: Lch 00111111 (3Fh) Rch 01111111 (7Fh) Power On VDD = Supply voltage Disable Power Down Power Down Preparation [ Power Down Mode ] Code: 11010011 (D3h) Wait 0.5 sec [ Power Down Mode ] Code: 11010010 (D2h) [ Disable Input & Gain = 0dB] Code: Lch 10000011 (83h) Rch 10100011 (a3h) wait 7 sec Power Down Preparation [ Power Down Mode ] Code: 11010010 (D2h) [ Disable Input & Gain = 0dB] Code: Lch 10000011 (83h) Rch 10100011 (a3h) wait 7 sec Default Status [Attenuation & Mute] Mute on (max attenuation) [ Input Gain ] 0dB [ Power Down Mode ] All are power down status [ Output Mode] BTL mode PDPR = 0 [ Power Down Mode ] Code: 11010000 (D0h) Wait 0.5 sec CAPPD = 0 [ Power Down Mode ] Code: 11010010 (D2h) Wait 0.5 sec Power Down All The Devices Only CAPPD Keep Activating [ Power Down Mode ] Code: 11011110 (DEh) Power Down All The Devices Pull Down CAP Pin To Ground [ Power Down Mode ] Code: 11011111 (DFh) Keep All The Digital Interface Signals Unchanged All The Digital Interface Signals Pull Low I2C pull low Mute Off And Volume Up/Down Step By Step Power Off [ Attenuation and Mute ] Code: Lch 00xxxxxx Rch 01xxxxxx Disconnect VDD VDD will be fell down to 0V REV 2 13/21 www.mosanalog.com MOSA For BTL mode only MS6864 Dual 2W Power Amplifiers with Volume Control REV 2 14/21 www.mosanalog.com MOSA APPLICATION INFORMATION A base application circuit MS6864 2.4~6.5V Supply 13 MS6864 Dual 2W Power Amplifiers with Volume Control AVDD AVSS CAP SCL SDA VSS PVDDL PVSSL PVSSR PVDDR 11 9 8 1uF 0.1uF 1uF 4 1uF 2.4~6.5V Power Amplifier Supply 2 16 1uF 6 MCU 15 1 VDD 100k 100k HP_sense 1uF 10uF R channel 14 MCU 100uF RIN OUTROUTR+ 12 10 RL 8Ω 100uF 1k 10uF L channel 3 Headphone Jack LIN OUTLOUTL+ 5 7 RL 8Ω 1k REV 2 15/21 www.mosanalog.com MOSA Output mode operation -- SE mode and BTL mode MS6864 Dual 2W Power Amplifiers with Volume Control The output has two modes, SE mode and BTL mode. The mode is selected by I2C code via MCU. In BTL mode, the outputs of A1(B1) and A2(B2) are then used to drive the speakers(4Ω/8Ω). A1 -1 A2 -1 B1 -1 B2 -1 OUTL+ OUTLRL 4Ω / 8Ω OUTR+ OUTRRL 4Ω / 8Ω I2C Interface SCL SDA In the SE mode, the amplifiers A2 and B2 are shutdown, and become the high output impedance states. A1 -1 A2 -1 Shutdown B1 -1 OUTL100uF 1k B2 -1 Shutdown OUTR100uF 1k Headphone Jack RL 16Ω / 32Ω I2C Interface SCL SDA Headphone sense The output mode is SE or BTL that is decided by a headphone. It has to be set SE mode when a headphone is plug-in status. The output mode is selected by I2C command code by MCU. Please note that the MS6864 don’t detect a headphone automatically. Thus a detect function is executed via MCU. An operation diagram is shown as follows: The HP_sense pin is high when a headphone is plug-in. The HP_sense pin is low when a headphone is not plug-in. REV 2 16/21 www.mosanalog.com MOSA EXTERNAL DIMENSIONS TSSOP16 (Thermal Pad) MS6864 Dual 2W Power Amplifiers with Volume Control D D2 Detail A E2 E1 E C A2 A A1 B L L1 e y Dimension in mm Symbol Dimension in inches Min 0.000 0.031 0.007 0.004 0.193 0.094 0.252 BSC 0.169 0.094 0.0256 BSC 0.018 0.035 0 o Min A A1 A2 b C D D2 E E1 E2 4.30 2.4 0.00 0.80 0.19 0.09 4.90 2.4 Nom 1.00 5.00 6.4 BSC 4.40 0.65 BSC Max 1.2 0.15 1.05 0.30 0.20 5.10 3 4.50 3 Nom 0.039 0.197 Max 0.047 0.006 0.041 0.012 0.008 0.201 0.118 0.173 0.177 0.118 e L L1 θ y 0.45 0.90 0 o 0.60 1.00 - 0.75 1.10 8 o 0.024 0.039 - 0.030 0.043 8 o - 0.10 - 0.004 REV 2 17/21 www.mosanalog.com MOSA SSOP20 (209mil) MS6864 Dual 2W Power Amplifiers with Volume Control Dimension in mm Symbol Dimension in inches Min 0.002 0.065 0.009 0.004 0.272 0.291 0.197 0.022 0.004 0 Min A A1 A2 b C D E E1 0.05 1.65 0.22 0.09 6.9 7.4 5 0.55 0.09 0 Nom 1.75 0.3 0.15 7.2 7.8 5.3 0.650 BASIC 0.75 1.25 REF. 4 Max 2 1.85 0.33 0.21 7.5 8.2 5.6 0.95 8 Nom 0.069 0.012 0.006 0.283 0.307 0.209 0.026 BASIC 0.03 0.049 REF. 4 Max 0.079 0.073 0.013 0.008 0.295 0.323 0.220 0.038 8 e L L1 R1 θ REV 2 18/21 www.mosanalog.com MOSA DEMO BOARD MS6864 Dual 2W Power Amplifiers with Volume Control 3 1 6 4 2 5 Function description Label 1: Supply Input Supply voltage range is 2.4V to 6.5V. Label 2: Reset All I/O pins are reset to default values. Label 3: Headphone Jack Used 3.5mm diameter of headphone with 32ohm Label 4: Speaker Output Connected to speaker with 8ohm or 4 ohm Label 5: Signal Input Connected to audio signals. Label 6: LED Indicator The LEDs indicate the chip status and IR received status. Power ON status, it is green-dark blink twice and then keeps on a light state. Power OFF status, it is green-dark blink four times and then keeps on a dark state. It is green-dark blink once when the MCU has received the function code correctly. SE mode and BTL mode operation The headphone controls operational mode. System enters SE mode when headphone jack is empty. When a set of headphone plugged into the jack, the system switched to BTL mode. REV 2 19/21 www.mosanalog.com MOSA IR Controller MS6864 Dual 2W Power Amplifiers with Volume Control Power ON/OFF : The power key. Press the key once to set power-on or power-off for MS6864. The default values are GAIN 0dB, ATTENUATION –20dB and MUTE-ON. VOL+, VOL- : The volume control keys. The volume control in 1.25dB/step as the switch is pressed once, the range is -77.5dB to 0dB. Gain+, Gain- : The gain control keys. The gain control in 3dB/step as the switch is pressed once, the range is 0dB to 21dB. Mute : The mute key Press the key once to set mute-on or mute-off. PD/Active : The power down key. Press the key once to set power-down or activation for MS6864. REV 2 20/21 www.mosanalog.com MOSA Circuit J1 1 2 DVDD + C3 0.1u DVDD + C4 1u R4 10K C6 20P 2 Y1 24M C7 20P + 1 + RST 1 2 3 4 5 IR_IN 6 SCL 7 8 SDA HP_IN 9 10 3 1 R5 + 1u C10 C9 1u AGND J6 1 2 INR J3 L1INL R L G 1 2 3 C12 C13 R8 R7 1K 1K C11 1u U2 10u + 10u + SP1 SPK_R C14 100u + + C16 1u 1 2 3 4 5 6 7 8 Vss SCL CAP SDA RIN LIN AVss AVDD -OUTR -OUTL PVDDR PVDDL +OUTR +OUTL PVSSR PVSSL MS6864 16 SCL 15 SDA 14 13 AVCC 12 11 10 9 + + + S1 + C2 10u U1 RST P3.0 P3.1 XTAL2 XTAL1 P3.2 P3.3 P3.4 P3.5 GND Vcc P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 P3.7 MS6864 Dual 2W Power Amplifiers with Volume Control R1 R2 10K 220 C1 + 47u Q1 1 2 3 VS GND IR IR + C5 470P R3 1K 20 19 18 17 16 15 14 13 12 11 IR_IN D1 POWER W1 JUMP DGND J2 1 2 AVCC AVCC + C8 0.1u + DGND Q2 NMOS 2 AT89C4051 100K R6 100K INPUT SP2 SPK_L + C15 100u 1 2 3 4 5 6 HP-IN HP-R R HP-L L G HEADPHONE J5 1 2 3 OUT C17 C18 1u 1u R10 1K R9 1K W2 Jumper AGND AGND DGND REV 2 21/21 www.mosanalog.com