Technical Note
BA6859AFP-Y,BA6664FM,BD6671FM
2)BA6664FM
Torque limit current and I/O gain settings are made by
the RNF resistance value.
Output to the motor will be opened at a chip tempe
175°C (Typ.). Do not use the IC in excess of a chip
rature of temperature of 150°C.
Resistance of 0.4 to 1.0Ωis recommended.
0.5Ω
RNF
Capacitor for noise level mitigation.
The recommended value is 0.47 µF to 10 µF.
28
27
26
RNF
VM
DRIVER
GSW
+
-
1µF
A3
A2
TSD
VM
GAIN
SWITCH
2
VCC
I/O gain
GAIN
CONTROL
25
+
-
VCC
1µF
4
CURRENT
SENSE AMP
Speed detection is attained by FG signal output.
A1
+
-
FG
PS
TL
24
23
7
8
The power saving mode is turned ON by low-level voltage,
and the circuit current and motor output will stop.
HALL AMP
PS
GND
+
-
TORQUE
SENSE AMP
EC
SERVO
SIGNAL
22
H1+
The motor torque current is controllable.
+
-
ECR
FR
9
21
20
If the ECR voltage is set between 1.6 and 2.2V, the
maximum torque limit current will be obtained.
-
H1
Hall1
Hall1
VCC
VCC
+
-
10
H2+
The detection of motor rotation direction is possible.
FG2
SB
+
-
11
19
18
R
H2-
D
Q
-
Q
The short brake is operated regardless of brake mode settings.
SHORT BRAKE
CK
+
-
12
H3+
CNF
Connect a capacitor for phase compensation.
The recommended value is 0.1µF.
17
+
-
13
0.1µF
BR
VH
Hall1
-
H3
BRAKE MODE
Hall Bias
FIN
16
15
14
Short brake and reversed brake settings are possible.
500Ω
500Ω
Resistor for setting Hall input level
.
The recommended value is 200 Ωto 1k Ω.
Output will be open when the reverse rotation of the motor is
detected.
Fig.6 BA6664FM Block Diagram
BA6664FM Pin Function Table
Pin No. Pin name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
N.C.
A3
N.C.
A2
N.C
N.C.
A1
GND
H1+
H1-
H2+
H2-
H3+
H3-
VH
N.C.
Output pin
N.C.
Output pin
N.C.
N.C.
Output pin
GND pin
Pd[W]
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall signal input pin
Hall bias input pin
Hall bias input pin
2.2
2.0
BR
Brake mode pin
Capacitor connection pin for phase
compensation
17
CNF
18
19
20
21
22
23
24
25
26
27
SB
FG2
FR
ECR
EC
PS
FG
VCC
GSW
VM
Short brake pin
1.0
FG 3-phase component output pin
Rotation detection pin
Output voltage control reference pin
Output voltage control pin
Power-saving pin
FG signal output pin
Power supply pin
Gain switching pin
0
25
50
75 85 100
125
150
Ta(℃)
Fig.7 Power Dissipation Reduction (BA6664FM、BD6671FM)
*Reduced by 11.6 mW/℃over 25℃, when mounted on a glass epoxy board
(70 mm x 70 mm x 1.6 mm).
Motor power supply pin
Resistance connection pin for output
current detection
28
RNF
FIN
FIN
GND
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2010.06 - Rev.A
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