Datasheet

LT6109-1/LT6109-2
23
610912fa
TYPICAL APPLICATIONS
MCU Interfacing with Hardware Interupts
SENSEHI SENSELO
OUTA
0.1Ω
V
+
100Ω
LT6109-1
V
–
TO LOAD
V
OUT
ADC IN
2k
6.65k
INC2
1.33k
INC1
V
+
EN/RST
OUTC1
8
1
7
6
5
OUTC2
10
9
10k
2
5V
4
3
RESET
6109 TA03
10k
5V
V
OUT
/ADC IN
AtMega1280
PB0
PB1
PCINT2
PCINT3
ADC2
PB5
5
6
7
2
3
1
UNDERCURRENT ROUTINE
RESET COMPARATORS
MCU INTERUPT
OUTC2 GOES LOW
5V
0V
610912 TA03b
Example:
The comparators are set to have a 50mA undercurrent
threshold and a 300mA overcurrent threshold. The MCU
will receive the comparator outputs as hardware interrupts
and immediately run an appropriate fault routine.
Simplified DC Motor Torque Control
The figure shows a simplified DC motor control circuit.
The circuit controls motor current, which is proportional
to motor torque; the LT6109 is used to provide current
feedback to a difference amplifier that controls the current
in the motor. The LTC
®
6992 is used to convert the output
of the difference amp to the motors PWM control signal.
SENSEHI SENSELO
OUTA
LT6109
V
–
5.62k
100k
2
3
7
LTC6246
1µF
4
6
1
3
6
IRF640
5V
1N5818
0.1Ω
V
MOTOR
5
4
2
0.47µF
V
OUT
CURRENT SET POINT (0V TO 5V)
3.4k
1k
INC2
1M
610912 TA04
1k
78.7k
100k
280k
INC1
V
+
EN/RST
OUTC1
OUTC2
RESET
100µF
+
–
LTC6992-1
V
+
GND
5V
BRUSHED
DC MOTOR
(0A TO 5A)
MABUCHI
RS-540SH
MOD
SET
OUT
DIV