BA8270F/BA8270FV
Audio ICS
BUS Interface for car audio
BA8270F/BA8270FV
The BA8270F/BA8270FV is bus interface IC (master side) developed for car audio applications. When used with the
BA827F/BA8272FV (slave side), it is possible to communication system for the deck and components such as power
amplifiers, CD and MD changers, tuners and TVs using BUS ON, DATA, CLOCK and RESET signals.
Applications
Car audio systems
Features
1) Allows construction of communication system with BUS ON, DATA, CLOCK and RESET signals with used with the
BA8272F/ 8272FV (slave side).
2) Ideal for car audio systems.
Absolute maximum ratings
(Ta=25°C)
Parameter
Symbol
V
CC
Pd
Topr
Tstg
V
IN
V
BATT
Limits
7.0
450
400
∗1
∗2
Unit
V
mW
Power supply voltege
Power dissipation
BA8270F
BA8270FV
Operating temperature
Storage temperature
Voltage range for input
Voltage range for BATT
−40
to
+85
−55
to
+125
−0.3
to
+7.0
−0.3
to
+18.0
C
C
V
V
Operating temperautre range is for I
L
1=50mA, and I
L
2=5mA.
∗1
Reduced by 4.5mW for each increase in Ta of 1 C over 25 C.
∗2
Reduced by 4.0mW for each increase in Ta of 1 C over 25 C.
Recommendable operating voltage range
(Ta=25°C)
Parameter
Symbol
V
CC
Min.
4.0
Typ.
−
Max.
7.0
Unit
V
Power supply voltage
1/5
BA8270F/BA8270FV
Audio ICS
Electrical characteristic curves
BATT CHECK
BUS ON IN
12
CLK IN
11
DATA IN
9
DATA OUT
8
10
RESET OUT
13
V
CC
14
R9
100k
R22
1k
R14
1k
22k
R10
4.7k
R20
100k
R15
100k
R35
100k
R10 47k
3k
R20
22k
R34
47k
R32
3.9k
56k
10k
7
GND
1
BUS ON OUT
4
CLK OUT
6
5
Vref
3
BATT
2
RESET OUT
DATA IN / OUT
Electrical characteristics
(Unless otherwise noted, Ta=25°C, V
CC
=5.5V)
Parameter
Symbol
I
CC1
I
CC2
I
CC3
V
LOSS1
V
LOSS2
I
IN1
I
IN2
I
IN3
I
IN4
R
14
R
22
R
29
I
DATA
V
SAT
V
6ON
V
10ON
Min.
Typ.
Max.
300
8.5
17
0.25
0.15
48
220
190
48
1k
1k
100k
1.1
0.2
0.1
15.0
30
0.35
0.2
70
300
300
70
1.25k
1.25k
125k
1.45
0.4
0.25
0.4
Unit
µA
mA
mA
V
V
µA
µA
µA
µA
Ω
Ω
Ω
mA
V
V
V
Conditions
Circuit current 1
Circuit current 2
Circuit current 3
Voltage 1 between
VCC and BUS ON OUT
Voltage 2 between
VCC and BUS ON OUT
Input pin current 1
Input pin current 2
Input pin current 3
Input pin current 4
Output internal resistor 1
Output internal resistor 2
Output internal resistor 3
DATA OUT pin output current
ON output voltage for each
DATA IN / OUT ON output voltage
BATTCHECK output voltage
Not designed for raduation resistance.
−
−
−
−
−
32
175
150
38
0.75k
0.75k
75k
0.75
No load and BATT pin (pin 3)=5.5V.
Other pins off
(excluding the BATT input current)
No load, BUS ON IN＝1.0V
IL1=50mA, IL2=50mA
IL1=100mA
IL2=40mA
BUS ON IN pin, 0V input
DATA IN pin，5.5V input
BATT pin，5.5V input
RESET OUT pin，0V input
CLK OUT
DATA IN / OUT
BATT CHECK
5.5V applied to DATA IN
0V input to BUS ON IN
CLK OUT，DATA OUT
DATA IN / OUT
−
−
−
−
−
2/5
BA8270F/BA8270FV
Audio ICS
Measurement current
I
LN1
A
5.5V
E11
E9
1
2
1
1
2
A
2
I
LN2
I
LN4
A
2
5.5V
1
I
CC
S9
S8
S7
S6
S5
1
2
A
S12
1
R29
2
V11
V
V10
Ω
13
RESET
OUT
12
BUS ON
IN
11
CLK IN
10
BATT
CHECK
9
DATA
IN
8
DATA
OUT
V
V8
14
V
CC
A
I
DATA
1
S1
2
BA8270F / BA8270FV
V
CC
5.5V
V
LOSS2
V
V
LOSS1
V
BUS ON
OUT
1
RESET
OUT
2
DATA
IN / OUT
6
BATT
3
CLK OUT
4
Vref
5
GND
7
V6
S11
1
2
1
S10
2
2
S2
1
2
S3
1 1
S4
2
V
V
Ω
R22
R14
Ω
I
L1
I
L2
A
I
IN3
5.5V
E3
Fig.1
3/5
BA8270F/BA8270FV
Audio ICS
Measurement circuit switch operation table
Parameter
Circuit current 1
Circuit current 2
Circuit current 3
Voltage 1 between V
CC
and BUS ON OUT
Voltage 2 between V
CC
and BUS ON OUT
Input pin current 1
Input pin current 2
Input pin current 3
Input pin current 4
Output internal resistor 1
Output internal resistor 2
Output internal resistor 3
DATA OUT pin output
current
CLK OUT pin output
voltage
DATA IN / OUT ON
output voltage
DATA IN / OUT ON
output volotage
BATT CHRCK
output voltage
Symbol
I
CC1
I
CC2
I
CC3
V
LOSS1
V
LOSS2
I
IN1
I
IN2
I
IN3
I
IN4
R
14
R
22
R
29
I
DATA
V
4ON
V
8ON
V
6ON
V
1ON
2
1
2
2
1
2
1
2
2
1
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
2
1
1
2
1
S
1
2
S
2
1
S
3
1
S
4
2
1
S
5
1
S
6
1
S
7
1
S
8
1
2
2
1
2
1
S
9
1
S S S
10 11 12
1
1
1
Measured pin
pin14
pin14
pin14
pin1-pin14
pin1-pin14
pin12
pin9
pin3
pin13
pin1-pin14
pin6-pin4
pin10-pin14
pin8
pin4
pin8
pin6
pin10
E
9
=5.5
E
11
=5.5
E
9
=5.5
E
9
=5.5
E
3
=5.5
E
9
=5.5
E
3
=5.5
−
−
−
−
Conditions
3pin=5.5V
12pin=0V
I
L1
=50mA, I
L2
=50mA
I
L1
=100mA
I
L1
=40mA
−
Application example
To slave unit
8
DATA
OUT
DATA
IN
BATT
CHECK
CLK IN
BUS ON
IN
RESET
OUT
V
CC
GND
DATA
IN / OUT
Vref
CLK
OUT
BATT
RESET
OUT
BUS ON
OUT
7
A
GND
9
10
6
5
B
BUS DATA
11
4
C
BUS CLK
BATT
(power supply)
RESET
12
3
D
13
2
E
14
1
F
BUS ON
Construct Zener diode circuits to provide over-voltage protection for DATA.
Fig.2
4/5
BA8270F/BA8270FV
Audio ICS
Operation notes
(1) We guarantee the application circuit design, but recommend that you thoroughly check its characteristics in actual
use. If you change any of the external component values, check both the static and transient characteristics of the circuit,
and allow sufficient margin in your selection to take into account variations in the components and ICs.
Note that Rohm has not fully investigated patent tights regarding this product.
(2) Based on the EIAJ static electric destruction voltage measurement (C=200pF and R0Ω), the withstanding voltage of
pins 9 and 11 has been determined to be 200V or less. Take due care.
Note that Rohm has not fullyinvestigated patent rights regarding this product.
External dimensions
(Unit : mm)
BA8270F
BA8270FV
8.7
+
0.2
−
14
8
5.0
+
0.2
−
14
8
6.2
+
0.3
−
6.4
+
0.3
−
4.4
+
0.2
−
4.4
+
0.2
−
0.15
+
0.1
−
1.5
+
0.1
−
1.15
+
0.1
−
1
7
1
7
0.22
+
0.1
−
0.11
0.1
1.27
0.4
+
0.1
−
0.65
0.3Min.
0.1
0.3Min.
0.15
SOP14
SSOP-B14
0.15
+
0.1
−
5/5
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