BA8272AFV Audio ICs BUS Interface for car audio BA8272AFV BA8272AFV is a BUS interface IC (slave side) developed for car audio systems. Communication system of BUS ON, DATA, CLOCK, and RESET can be constructed in combination with BA8270F / BA8270FV (master side). This IC can be used for communication between the audio system and other applications such as power amplifier, CD, MD changer, navigation and TV. !Applications Car audio !Features 1) It can be used for 3V Interface system. 2) It can build up the communication system of BUS ON, DATA, CLOCK and RESET in combination with BA8270FV (IC at a master side) in pairs. 3) Suitable for car audio. !Absolute maximum ratings (Ta=25°C) Parameter Supply voltage Power dissipation Symbol Limits Unit VCC 7.0 V Pd 400 ∗ mW Operating temperature range Topr −40~+85 °C Storage temperature range Tstg −55~+125 °C Range of voltage applied to an inter terminal − −0.3~+7.0 V ∗ Reduced by 4mW for each increase in Ta of 1°C over 25°C. (Board size 50×50×1.6mm) The operating temperature range shall be within IL=50mA. !Recommended operating conditions (Ta=25°C) Parameter Supply voltage Symbol Min. Typ. Max. Unit VCC 2.8 − 7.0 V 1/8 BA8272AFV Audio ICs !Block diagram LINK OFF BUS ON 12 13 CLK OUT DATA IN 11 DATA OUT RESET 10 8 9 VCC 14 R3 47k R14 22k R32 27k R16 4.7k R21 4.7k Q42 R26 12.3k R2 47k R10 47k R5 3.9k R9 26k R22 1k R1 26k 1 2 BUS ON OUT BUS ON IN R24 19.7k R23 47k 4 5 6 7 BUS CLK VREF BUS DATA BUS RESET 3 GND 2/8 BA8272AFV Audio ICs !Electrical characteristics _ (unless otherwise noted, Ta=25°C, Vcc=5.5V) Parameter Symbol Min. Typ. Max. Unit Conditions Circuit current 1 ICC1 − − 10 µA Circuit current 2 ICC2 − 1.1 3.0 mA Upon no load LINK OFF=5.5V Circuit current 3 ICC3 − 5.0 13.0 mA IL=50mA VCC-BUS ON OUT voltage 1 VLOSS1 − 0.15 0.35 V IL=100mA VCC-BUS ON OUT voltage 2 Upon no load, all the terminals turn OFF. VLOSS2 − 0.09 0.2 V IL=40mA Input terminal current 1 IIN1 75 100 140 µA BUS ON input terminal 5.5V input Input terminal current 2 IIN2 75 100 140 µA LINK OFF terminal 5.5V input Input terminal current 3 IIN3 10 25 40 µA BUS CLK terminal 5.5V input Input terminal current 4 IIN4 10 25 40 µA BUS DATA terminal 5.5V input Input terminal current 5 IIN5 330 395 500 µA DATA IN terminal 5.5V input Input terminal current 6 IIN6 3.5 4.8 6.4 mA BUS RESET terminal 5.5V input Output internal resistor 1 R3 35.2 47 58.8 kΩ BUS ON terminal Output internal resistor 2 R21 3.52 4.7 5.88 kΩ DATA OUT terminal Output saturation voltage 1 VSAT1 − 0.2 0.4 V BUS ON, CLK OUT, DATA OUT Output saturation voltage 2 VSAT2 − 0.1 0.25 V BUS DATA pull up resistance 1kΩ Reset output voltage VBON − 0.2 0.4 V I8=1mA, BUS RESET terminal 5.5V CLK OUT output "H" level VHBA VHI −0.3 VHI −0.5 VHI −0.7 V 0V inputted into the BUS CLOCK terminal. "H" level of the BUS ON OUT terminal shall be VH1. VHBA=VH1−VH3 BUS CLK input threshold level VTH 0.75 0.80 0.85 V BUS CLK input hysteresis width VHYS 300 400 500 mV CLK OUT terminal observation CLK OUT terminal observation This product is not designed for protection against radio active rays. 3/8 BA8272AFV Audio ICs !Measurement circuit IIN2 Ω R3 A + E12 1 2 ICC + 1mA E9 5.5V 1 2 S10 5.5V 2 S9 S8 1 2 S7 A + 1 I8 IIN5 A V13 + V V V11 + + V V10 + V 1 14 13 12 11 10 9 8 VCC BUS ON LINK OFF CLK OUT DATA OUT DATA IN RESET BUS ON OUT BUS ON IN GND BUS CLK VREF BUS DATA BUS RESET 1 2 3 4 5 6 7 V8 on 2 S1 VCC 5.5V + V VLOSS Ω VHB + 2 + 1 S11 S6 V S2 2 S3 1 1 2 A IL E2 V6 1kΩ 2 1 A IIN1 + 5.5V 5.5V + V S4 ∼ R21 V S5 A IIN3 + IIN4 + 5.5V E4 0V 2 1 1 2 1 2 A + IIN6 5.5V E7 E6 S12 Fig.1 4/8 BA8272AFV Audio ICs SW operation table of measurement circuit diagram Symbol S 1 S 2 S 3 S 4 S 5 S 6 S 7 S 8 S 9 S 10 S 11 S 12 Mesurement terminal Circuit current 1 ICC1 2 1 1 1 1 1 1 1 1 1 1 1 Pin14 Circuit current 2 ICC2 2 1 1 1 1 1 1 1 2 1 1 1 Pin14 Circuit current 3 ICC3 2 2 1 1 1 1 1 1 2 1 1 1 Pin14 E12=5.5V, IL=50mA VCC-BUS ON OUT voltage 1 VLOSS1 2 2 1 1 1 1 1 1 2 1 1 1 Pin1−Pin14 E12=5.5V, IL=100mA VCC-BUS ON OUT voltage 2 Parameter Conditions E12=5.5V E12=5.5V, IL=40mA VLOSS2 2 2 1 1 1 1 1 1 2 1 1 1 Pin1−Pin14 Input terminal current 1 IIN1 2 1 2 1 1 1 1 1 1 1 1 1 Pin2 Input terminal current 2 IIN2 2 1 1 1 1 1 1 1 2 1 1 1 Pin12 E12=5.5V Input terminal current 3 IIN3 2 1 1 2 1 1 1 1 1 1 1 1 Pin4 E4=5.5V Input terminal current 4 IIN4 2 1 1 1 2 1 1 1 1 1 1 1 Pin6 E6=5.5V Input terminal current 5 IIN5 2 1 1 1 1 1 1 2 1 1 1 1 Pin9 E9=5.5V Input terminal current 6 IIN6 2 1 1 1 1 2 1 1 1 1 1 1 Pin7 E7=5.5V Output internal resistor 1 R3 1 1 1 1 1 1 1 1 1 2 1 1 Pin13−Pin14 E2=5.5V R21 1 1 1 1 1 1 1 1 1 1 2 1 Pin1−Pin10 Output saturation voltage 1 VSAT1 2 1 2 1 1 1 1 1 1 1 1 1 Pin13 E2=5.5V, BUS ON terminal Output saturation voltage 1 VSAT1 2 1 1 2 2 1 1 1 2 1 1 1 Pin11 E4=5.5V, CLK OUT terminal, E12=5.5V Output saturation voltage 1 VSAT1 2 1 1 1 1 1 1 1 2 1 1 1 Pin10 E6=5.5V, DATA OUT terminal, E12=5.5V Output saturation voltage 2 VSAT2 2 1 1 1 1 1 1 1 1 1 1 2 Pin6 E9=5.5V, BUS DATA terminal Reset output voltage VBON 2 1 1 1 1 2 2 1 2 1 1 1 Pin8 E7=5.5V, RESET terminal CLK OUT output "H" level VHBA 2 1 1 2 2 1 1 1 2 1 1 1 Pin1−Pin11 BUS CLK input threshold level VTH 2 1 1 2 2 1 1 1 2 1 1 1 Pin4 E4=0~3V, sweep, E12=5.5V BUS CLK input hysteresis width VHYS 2 1 1 2 2 1 1 1 2 1 1 1 Pin4 E4=0~3V, sweep, E12=5.5V Output internal resistor 2 E4=0V, E12=5.5V !Application example To master unit To next slave unit BUS RESET 7 E RESET E RESET BUS DATA 6 B BUS. DATA B BUS.DATA VREF 5 11 CLK OUT BUS CLK 4 C BUS. CLK C BUS. CLK 12 LINK OFF GND 3 A GND A GND BUS ON IN 2 F BUS ON F BUS ON BUS ON OUT 1 8 RESET 9 DATA IN Schottky 10 DATA OUT 13 BUS ON 14 VCC Slave micon LINK OFF • Establish a protection circuit woth Schottky diode to prevent an error in operation due to noise of GND potential or less of BUS ON and BUS CLK. • Establish a protection circuit with Zener diode to prevent over-voltage. Fig.2 5/8 BA8272AFV Audio ICs !Operation notes 1. About operation voltage supply range Within operation voltage supply range, basic circuit function operation is guaranteed within operation ambient temp. But please confirm set up of constant and element, voltage set up and temp set up on use. 2. About operation temp range If it within recommended operation voltage range, circuit function operation is guaranteed within operation temp. It corralled to conditions of power dissipation to temp. Please watch out except condition stipulated by electrical characteristics within the range, it cannot guarantee standard value of electrical characteristics. But it retains original function. 3. About application circuit Example of application circuit drawing is convinced as recommendable, but please confirm characteristic including above mentioned noticed. At use with modification of external constant, please decide with enough margin considering distribution, ETC of this IC, external parts including quiescence characteristics and excessive characteristics. Please note that we have not yet confirmed any concerned patent rights completely. 4. In this model, the resistance R24 and R26 shown into Block diagram were changed from previous model (BA8272FV) as follows. BA8272FV : R24=10kΩ, R26=22kΩ BA8272AFV : R24=19.7kΩ, R26=12.3kΩ 5. Electrostatic destruction withstanding voltage of Pin4, Pin5 and Pin12 must be 200V or less according to EIAJ stand (C=200pF, R=0Ω). Take above into consideration when in use. 6/8 BA8272AFV Audio ICs 6. When supply voltage is changed then the threshold voltage is also changed. Please refer to the standard value (reference) of threshold voltage of each input terminal as shown below. Make sure to confirm the characteristics adequately and leave an adequate margin for noise. Unless specified particularly, switches of MEASUREMENT CIRCUIT DIAGRAM shown Fig.1 are switched the side of 1. The threshold voltage is value at room temperature. Input terminal Pin2 Pin4 Pin6 Pin7 Pin9 Pin12 Measurement conditions Standard value of threshold voltage (reference) [V] Supplu voltage [v] 1.9 2.8 1.9 3.3 2.0 5.5 2.1 7.0 0.5 2.8 0.7 3.3 1.2 5.5 1.6 7.0 0.5 2.8 0.7 3.3 1.2 5.5 1.6 7.0 0.8 − 1.3 2.8 1.4 3.3 1.6 5.5 1.8 7.0 1.8 − SW operation and circuit conditions Definition of the threshold voltage S1=2, S3=2, S9=2, E12=VCC Value of E2 when the output voltage of Pin13 becomes 0.1 VCC. S1=2, S9=2, S4=2, E12=VCC Value of E4 when the output voltage of Pin11 becomes 0.1 VCC. S1=2, S5=2, S9=2, E12=VCC Value of E6 when the output voltage of Pin10 becomes 0.1 VCC. S1=2, S6=2, S8=2, I8=1mA Value of E7 when the output voltage of Pin8 becomes 0.1 VCC. S1=2, S8=2, S9=2, S12=2, E12=VCC Value of E9 when the output voltage of Pin6 becomes 0.1 VCC. S1=2, S9=2 Value of E12 when the output voltage of Pin1 becomes 0.9 VCC. 7/8 BA8272AFV Audio ICs !External dimensions (Units : mm) 5.0±0.2 8 1 7 1.15±0.1 0.1 6.4±0.3 4.4±0.2 0.3Min. 14 0.65 0.15±0.1 0.1 0.22±0.1 SSOP-B14 8/8