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| MLX81100_14 Datasheet, PDF (11/19 Pages) Melexis Microelectronic Systems – DC-Motor Controller | |||
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MLX81100
DC-Motor Controller
3.6 Human Interface Device with DC-Motor
In this sample application the IC can realize the driving of a feedback DC motor via an external power N-FET
bridge. The high side N-FET driver is created with a bootstrap output stage. The current control of the motor
is done via shunt measurement and the reverse polarity protection of the bridge must be realized with an
external power FET connected to the ground line.
Short circuits of the bridge will be detected from fast comparators and in this case the bridge will be switched
off. Weak short circuits are monitored with an external temperature sensor. Detecting rotation direction and
positions of a rotating encoder can be easy done via the timer capture inputs. The 6 high voltage pins SW[n]
make it possible to implement a switch matrix up to 3x3 or 6 single switches.
VBAT
4.7 ..10uF
47uF
1uF
100nF
VS
RTG
VDD5V
100nF
V1V8
100nF
PS
SW0
SW1
SW3
SW4
SW5
VCC
Temperature
sensor
VCC
VCC
Rotation-
encoder
SW6
SW7
IO0
IO1
IO2
IO3
IO4
IO5
10
LIN
180p
LIN
GND
GND
VDRV
CLKO
HSBC2
HS2
BRMID2
100nF
VBAT
100nF
HSBC1
HS1
BRMID1
100nF
M
LS1
LS2
SW2
GND
SHNT_L
CWD
TI0
CWD
TI1
TO
GND
GND
Shunt
VBAT
Reverse
Polarity
Protection
Figure 7 - Application circuitry for human interface device with DC-motor
MLX81100 â Product Abstract
Page 11 of 19
June 2012
Rev 021
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