MS6864 MOSA Dual 2W Power Amplifiers with Volume Control Dual 2W Power Amplifier, I2C interface Stereo Input with Volume Control FEATURES •Control interface : I2C •Excellent Power Supply Rejection Ratio(PSRR) •Flexibility power management •Component less •Reduce pop noise circuit •Housed in TSSOP16 package, enhanced thermal PAD •Operation range: 2.4V~5.5V •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=4Ω, 2W at 5V, 0.8W at 3.3V, 360mW at 2.4V RL=8Ω, 1.3W at 5V, 0.53W at 3.3V, 250mW at 2.4V •SE Output power RL=32Ω, 93mW at 5V, 35mW at 3.3V, 15mW at 2.4V 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 4Ω bridged-tied (BTL) speaker or 2 * 90mW into stereo 32Ω 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~5.5V, low power consumption, power management, component less and small package TSSOP16, make the MS6864 ideally suitable for use in the portable digital audio equipments. BLOCK DIAGRAM Gain 0 ~ 21dB LIN Attenuation 0 ~ -78.5dB & Mute -1 OUTR- -1 Gain 0 ~ 21dB RIN Attenuation 0 ~ -78.5dB & Mute -1 OUTL- -1 AVDD REV 1.0 AVSS CAP SCL SDA OUTL+ Power Amplifier Supply I2C Interface Supply OUTR+ VSS 1 PVDDL PVSSL PVDDR PVSSR www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control PIN CONFIGURATION Symbol Pin Description VSS 1 Connected to ground CAP 2 Capacitor connected RIN 3 Right channel input AVSS 4 OUTR- 5 PVDDR 6 OUTR+ 7 PVSSR 8 PVSSL 9 OUTL+ 10 PVDDL 11 OUTL- 12 AVDD 13 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 LIN 14 Left channel input SDA 15 I2C data input VSS 1 16 SCL CAP 2 15 SDA RIN 3 14 LIN AVSS 4 13 AVDD Thermal Pad OUTR- 5 12 OUTL- PVDDR 6 11 PVDDL OUTR+ 7 10 OUTL+ 9 PVSSL PVSSR 8 MS6864, TSSOP16 SCL 16 I2C clock input Note: 1. SE: Single Ended. BTL: Bridged-Tied Load ORDERING INFORMATION Package Part number Packaging Marking Transport Media 16Pin TSSOP (lead free) MS6864TGTR MS6864G 2.5k Units Tape and Reel 16Pin TSSOP (lead free) RoHS Compliance MS6864TGU MS6864G 90 Units Tube ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit 6 V 2000 V VDD Supply voltage VESD Electrostatic handling TSTG 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 TSSOP16 (enhanced thermal pad) 51 ℃/W OPERATING RATINGS Symbol VDD REV 1.0 Parameter Supply voltage 2 Min Typ Max Unit 2.4 5 5.5 V www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control 5V ELECTRICAL CHARACTERISTICS (Ta=25℃, VDD=5V, VSS=0V, f=1kHz; unless otherwise specified) Parameter Symbol Conditions Min All devices are active, BTL 0.5VDD -0.05 0.5VDD -0.05 - Typ Max Unit DC Characteristics VCAP Voltage at CAP VDC Output DC level IQ Quiescent current 0.5VDD 0.5VDD 10 All devices are active, SE 6.7 L-ch (R-ch) PD, BTL 5.2 L-ch (R-ch) PD, SE 3.4 All devices power down All devices power down, except CAP=1/2 VDD - IPD Power down current ATT Mute attenuation GARAN Gain/Attenuation range GSTEP Gain step - ASTEP Attenuation step EGA Gain/Attenuation step error VI2CH Serial interface high input level 2 VI2CL Serial interface low input level Gain V V mA 0.3 uA 12 -90 dB 21 dB 0 dB 3 - dB - 1.25 - dB - 0.3 - dB 0 Attenuation - 0.5VDD +0.05 0.5VDD +0.05 - - -77.5 V 0.8 V AC Characteristics PSRR CS Power supply rejection ratio Channel separation THD+N Total harmonic distortion plus Noise S/N Signal-to-noise ratio Po Maximum output power 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 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% - 61 - dB - 65 - dB - 78 - dB - 81 - dB - -65 - dB - 0.0562 - % - 93 - dB - 2 - W - 1.3 - W - 93m - W PD: Power Down REV 1.0 3 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control 3.3V ELECTRICAL CHARACTERISTICS (Ta=25℃, VDD=3.3V, VSS=0V, f=1kHz; unless otherwise specified) Parameter Symbol Conditions Min Typ Max All devices are active, BTL - 9 - All devices are active, SE - 6 - L-ch (R-ch) PD, BTL - 4.6 - L-ch (R-ch) PD, SE - 3.0 - Unit DC Characteristics IQ Quiescent current mA AC Characteristics THD+N Po - -65 60 dB - 0.0562 0.1 % - 0.8 - W - 0.53 - W - 35m - W Conditions Min Typ Max Unit All devices are active, BTL - 7.6 - All devices are active, SE - 5.1 - L-ch (R-ch) PD, BTL - 4 - L-ch (R-ch) PD, SE - 2.6 - - -65 -60 dB - 0.0562 0.1 % - 0.36 - W - 0.25 - W - 15m - W Total harmonic distortion plus Noise SE mode, RL=32Ω, 35mW Maximum output power BTL Mode, RL = 4Ω THD+N = 1% BTL Mode, RL = 8Ω THD+N = 1% SE Mode, RL = 32Ω THD+N = 0.1% 2.4V ELECTRICAL CHARACTERISTICS (Ta=25℃, VDD=2.4V, VSS=0V, f=1kHz; unless otherwise specified) Parameter Symbol DC Characteristics IQ Quiescent current mA AC Characteristics THD+N Po REV 1.0 Total harmonic distortion plus Noise SE mode, RL=32Ω, 15mW Maximum output power BTL Mode, RL = 4Ω THD+N = 1% BTL Mode, RL = 8Ω THD+N = 1% SE Mode, RL = 32Ω THD+N = 0.1% 4 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control TYPICAL PERFORMANCE CHARACTERISTICS VDD=5V, Po=2W BTL mode, RL=4Ω VDD=3.3V, Po=0.8W BTL mode, RL=4Ω VDD=2.4V, Po=330mW BTL mode, RL=4Ω THD+N (%) FREQUENCY (Hz) THD+N vs. frequency THD+N (%) FREQUENCY (Hz) THD+N vs. frequency THD+N (%) FREQUENCY (Hz) THD+N vs. frequency VDD=5V, Po=1.2W BTL mode, RL=8Ω VDD=3.3V, Po=0.53W BTL mode, RL=8Ω VDD=2.4V, Po=250mW BTL mode, RL=8Ω FREQUENCY (Hz) THD+N vs. frequency THD+N (%) Po=25mW VDD=3.3V, Po=35mW SE mode, RL=32Ω THD+N (%) FREQUENCY (Hz) THD+N vs. frequency THD+N (%) FREQUENCY (Hz) THD+N vs. frequency VDD=5V, Po=90mW SE mode, RL=32Ω REV 1.0 THD+N (%) THD+N (%) THD+N (%) (Ta=25℃; unless otherwise specified) VDD=2.4, Po=15mW SE mode, RL=32Ω FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) THD+N vs. frequency THD+N vs. frequency THD+N vs. frequency 5 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control f=20kHz f=20kHz f=1kHz f=1kHz THD+N (%) THD+N (%) THD+N (%) f=20kHz f=1kHz f=20Hz f=20Hz f=20Hz VDD=3.3V BTL mode RL=4Ω VDD=5V BTL mode RL=4Ω VDD=2.4V BTL mode RL=4Ω 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=1kHz f=1kHz f=1kHz THD+N (%) THD+N (%) THD+N (%) f=20kHz f=20Hz f=20Hz f=20Hz VDD=5V BTL mode RL=8Ω VDD=3.3V BTL mode RL=8Ω VDD=2.4V BTL mode RL=8Ω 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=1kHz VDD=5V SE mode RL=32Ω REV 1.0 f=20Hz f=1kHz VDD=3.3V SE mode RL=32Ω THD+N (%) f=20Hz THD+N (%) THD+N (%) f=20kHz f=20Hz f=1kHz VDD=2.4V SE mode RL=32Ω OUTPUT POWER (W) OUTPUT POWER (W) OUTPUT POWER (W) THD+N vs. output power THD+N vs. output power THD+N vs. output power 6 www.mosanalog.com MS6864 Dual 2W Power Amplifiers with Volume Control CHANNEL SEPARATION (dB) CHANNEL SEPARATION (dB) MOSA VDD=5V, Po=1W BTL, RL=8Ω VDD=5V, Po=60mW SE, RL=32Ω FREQUENCY (Hz) FREQUENCY (Hz) Channel separation vs. frequency Channel separation vs. frequency CAP=10uF CAP=10uF CAP=1uF PSRR (dB) PSRR (dB) CAP=1uF VDD=5V, VRR=200mVrms, BTL RL=8Ω VDD=5V, VRR=200mVrms, SE RL=32Ω FREQUENCY (Hz) FREQUENCY (Hz) PSRR vs. frequency PSRR vs. frequency LPD or RPD BTL SE QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) All Devices activate. BTL SE SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Quiescent current vs. supply voltage Quiescent current vs. supply voltage REV 1.0 7 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control I2C CONTROL INTERFACE 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 1-7 8 9 R/W ACK 1-7 8 9 1-7 8 9 S P ADDRESS START CONDITION DATA ACK DATA ACK STOP CONDITION I2C chip address 88H 1 0 0 0 1 7 bits address REV 1.0 0 0 0 W 8 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control I2C data bytes description MSB LSB Function 0 0 B2 B1 B0 A2 A1 A0 L-ch, Attenuation and Mute 0 1 B2 B1 B0 A2 A1 A0 R-ch, Attenuation and Mute 1 0 0 G2 G1 G0 0 0 L-ch, Input Gain 1 0 1 G2 G1 G0 0 R-ch, Input Gain 1 1 0 1 RPD LPD PDPR 0 CAP PD S/B 0 0 1 1 1 Where Ax = 1.25dB/step; Bx = 10dB/step; Gx = 3dB/step 0 0 Power Down Mode Output mode (SE/BTL) Attenuation and Mute MSB LSB 0 0 0 1 B2 B1 B0 L-ch, Attenuation and Mute A2 A1 A0 0 0 0 0 dB 0 0 1 -1.25 dB 0 1 0 -2.5 dB 0 1 1 -3.75 dB 1 0 0 -5 dB 1 0 1 -6.25 dB 1 1 0 -7.5 dB 1 1 1 -8.75 dB R-ch, Attenuation and Mute 0 0 0 0 dB 0 0 1 -10 dB 0 1 0 -20 dB 0 1 1 -30 dB 1 0 0 -40 dB 1 0 1 -50 dB 1 1 0 -60 dB 1 1 1 -70 dB 1 1 1 1 Initial state: Both L-ch and R-ch are mute-on. REV 1.0 Function 1 1 Mute 9 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control Input Gain LSB MSB 1 0 0 1 0 1 0 Function L-ch, Input Gain 0 G2 G1 G0 0 0 0 0 dB 0 0 1 3 dB 0 1 0 6 dB 0 1 1 9 dB 1 0 0 12 dB 1 0 1 15 dB 1 1 0 18 dB R-ch, Input Gain 1 1 1 Initial state: Both L-ch and R-ch are 0dB gain. 21 dB Power Down Mode MSB 1 1 0 1 RPD LSB CAP LPD PDPR PD Function Power mode selection and power management 0 R-ch PA output is active mode 1 R-ch PA output is power down mode 0 L-ch PA output is active mode 1 L-ch PA output is power down mode 0 Disable preparation for power off 1 Enable preparation for power off 0 Set the voltage of CAP to middle of supply voltage 1 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. LPD -1 -1 RPD -1 -1 Output mode (SE/BTL) MSB 1 LSB 1 1 S/B 0 0 0 Output mode, mixer control and audio format 0 0 Output mode is BTL 1 Initial state: Output mode is BTL mode. REV 1.0 Function Output mode is SE 10 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control I2C Initial code and status MSB LSB Function Initial status 0 0 1 1 1 1 1 1 L-ch, Attenuation and Mute Mute On 0 1 1 1 1 1 1 1 R-ch, Attenuation and Mute Mute On 1 0 0 0 0 0 0 0 L-ch, Input Gain 0dB 1 0 1 0 0 0 0 0 R-ch, Input Gain 1 1 0 1 1 1 1 1 Power Down Mode 1 1 1 0 0 0 0 0 Output mode (SE/BTL) 0dB All devices are power down BTL 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 L-ch, G = 3dB 1 0 0 1 0 0 ACK Stop 0 ACK Stop 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 -5dB 1 1 0 -30dB 0 ACK 0 1 L-ch, Att = -15dB 0 1 0dB 1 0 0 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 0 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 BTL mode REV 1.0 11 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control OPERATION PROCEDURE 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 Setting Input Gain IsFixed Volume Down To Mute Input Channels Mute On Volume Down To Mute Input Channels Mute On I2C pull low V DD = GND Power On [ Enable Input & Input Gain ] Code: Lch 100xxx00 Rch 101xxx00 [ Attenuation and Mute ] Code: Lch 00111111 (3Fh) Rch 01111111 (7Fh) Disable Power Down Power Down Preparation V DD = Supply voltage [ 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 Default Status [Attenuation & Mute] Mute on (max attenuation) [ Input Gain ] 0dB Power Down Preparation [ Power Down Mode ] Code: 11010010 (D2h) [ Disable Input & Gain = 0dB] Code: Lch 10000011 (83h) Rch 10100011 (a3h) wait 7 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 ] All are power down status [ Output Mode] BTL mode [ Attenuation and Mute ] Code: Lch 00111111 (3Fh) Rch 01111111 (7Fh) [ Power Down Mode ] Code: 11011110 (DEh) Power Down All The Devices Pull Down CAP Pin To Ground [ Power Down Mode ] Code: 11011111 (DFh) PDPR = 0 [ Power Down Mode ] Code: 11010000 (D0h) Wait 0.5 sec 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 REV 1.0 Disconnect V DD VDD will be fell down to 0V 12 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control For BTL mode only Power On Activating Power Down (Shut Down) Power Off All the Digital Interface Signals Pull Low Setting Input Gain IsFixed Volume Down To Mute Input Channels Mute On Volume Down To Mute Input Channels Mute On I2C pull low V DD = GND Power On [ Input Gain ] Code: Lch 100xxx00 Rch 101xxx00 [ Attenuation and Mute ] Code: Lch 00111111 (3Fh) Rch 01111111 (7Fh) Disable Power Down Pull Down CAP Pin To Ground V DD = Supply voltage [ Power Down Mode ] Code: 11010000 (D0h) Wait 0.5 sec [ Power Down Mode ] Code: 11010001 (D1h) Wait 0.1 sec [ Attenuation and Mute ] Code: Lch 00111111 (3Fh) Rch 01111111 (7Fh) Pull Down CAP Pin To Ground [ Power Down Mode ] Code: 11010001 (D1h) Wait 0.1 sec Default Status [Attenuation & Mute] Mute on (max attenuation) Mute Off And Volume Up/Down Step By Step [ Input Gain ] 0dB [ Attenuation and Mute ] Code: Lch 00xxxxxx Rch 01xxxxxx Power Down All The Devices [ Power Down Mode ] Code: 11011111 (DFh) Power Down All The Devices [ Power Down Mode ] Code: 11011111 (DFh) [ Power Down Mode ] All are power down status [ Output Mode] BTL mode Keep All The Digital Interface Signals Unchanged All The Digital Interface Signals Pull Low I2C pull low Power Off Disconnect V DD VDD will be fell down to 0V REV 1.0 13 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control APPLICATION INFORMATION A base application circuit MS6864 2.4~5.5V Supply 13 1uF 0.1uF 1uF MCU 4 2 AVDD AVSS CAP 16 SCL 15 SDA 1 VSS PVDDL PVSSL 11 9 PVSSR 8 PVDDR 6 2.4~5.5V Power Amplifier Supply 1uF 1uF VDD 100k 100k MCU HP_sense 1uF 10uF 100uF 14 L channel LIN OUTL- 12 OUTL + 10 OUTR- 5 OUTR+ 7 RL 8Ω 10uF R channel REV 1.0 3 1k Headphone Jack 100uF RIN RL 8Ω 14 1k www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control Output mode operation -- SE mode and BTL mode 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 OUTR- -1 RL 4Ω / 8Ω A2 OUTR+ -1 B1 OUTL- -1 RL 4Ω / 8Ω B2 OUTL+ -1 I2C Interface SCL SDA In the SE mode, the amplifiers A2 and B2 are shutdown, and become the high output impedance states. Headphone Jack A1 OUTR- -1 100uF RL 16Ω / 32Ω 1k A2 Shutdown -1 B1 100uF OUTL- -1 1k B2 Shutdown -1 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: VDD MS6864 100k SCL 100k MCU SDA 1uF HP_sense 100uF OUTLOUTL+ RL 8Ω 1k Headphone Jack 100uF OUTROUTR+ RL 8Ω 1k 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 1.0 15 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control EXTERNAL DIMENSIONS TSSOP16 (Thermal Pad) D D2 Detail A E2 E1 E C A2 A θ A1 B e L y L1 Dimension in mm Dimension in inches Symbol Min REV 1.0 Nom Max Min Nom Max A - - 1.15 - - 0.045 A1 0.00 - 0.10 0.000 - 0.004 A2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 - 0.30 0.007 - 0.012 C 0.09 - 0.20 0.004 - 0.008 D 4.90 5.00 5.10 0.193 0.197 0.201 D2 3.7 3.8 3.9 0.146 0.150 0.154 E 6.20 6.4 6.60 0.244 0.252 0.260 E1 4.30 4.40 4.50 0.169 0.173 0.177 E2 2.7 2.8 2.9 0.106 0.110 0.114 e - 0.65 - - 0.026 - L 0.45 0.60 0.75 0.018 0.024 0.030 L1 0.90 1.00 1.10 0.035 0.039 0.043 θ 0 - 8 0 - 8 y - - 0.10 - - 0.004 o o o 16 o www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control DEMO BOARD 3 1 4 6 2 5 Function description Label 1: Supply Input Supply voltage range is 2.4V to 5.5V. 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 1.0 17 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control IR Controller 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 1.0 18 www.mosanalog.com MS6864 MOSA Dual 2W Power Amplifiers with Volume Control Circuit J1 DVDD R1 1 2 + + DVDD C3 0.1u S1 + C2 10u C4 1u U1 RST R4 1 2 3 4 5 IR_IN 6 SCL 7 8 SDA HP_IN 9 10 10K 20P 2 + C6 20P 3 + C7 1 Y1 24M W1 JUMP DGND Q2 J2 AVCC RST P3.0 P3.1 XTAL2 XTAL1 P3.2 P3.3 P3.4 P3.5 GND + AVCC C8 0.1u Q1 C1 + 1 47u 2 3 IR_IN 20 19 18 17 16 15 14 13 12 11 Vcc P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 P3.7 R2 10K VS GND IR IR D1 POWER + C5 470P DGND AT89C4051 1 R5 NMOS 2 1 2 R3 1K 220 100K + 1u + C10 C9 1u AGND J6 1 2 R6 C11 INR R L G C12 1 2 3 4 5 6 7 8 10u + C13 10u + INPUT L1INL 1 2 3 U2 + J3 R8 R7 1K 1K 100K 1u SP1 SPK_R C14 100u + + Vss SCL CAP SDA RIN LIN AVss AVDD -OUTR -OUTL PVDDR PVDDL +OUTR +OUTL PVSSR PVSSL 16 SCL 15 SDA 14 13 AVCC 12 11 10 9 + MS6864 C16 1u SP2 SPK_L + C17 C18 1u 1u + C15 100u 1 2 3 4 5 6 R9 1K R10 1K HP-IN HP-R R HP-L L G HEADPHONE J5 1 2 3 OUT W2 Jumper AGND REV 1.0 AGND DGND 19 www.mosanalog.com