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| MLX81100_14 Datasheet, PDF (7/19 Pages) Melexis Microelectronic Systems – DC-Motor Controller | |||
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MLX81100
DC-Motor Controller
3. Application Circuitry
3.1 Single DC-Motor Drive
In this sample application the IC can drive a DC motor via an external power N- FET's bridge. The high side
N-FET drive is done by a bootstrap output stage. Current control of the motor is done via shunt
measurement; the reverse polarity protection of the bridge has to 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 should be monitored with the help of an external
temperature sensor.
The actual position can be read with hall sensors, which are connected to the timer capture inputs. The hall
sensors are switched off during standby mode via a switch-able battery voltage output PS. Optional it is
possible to connect an external serial EEPROM via serial interface in case the usage of an integrated
MEMORY is forbidden by safety reasons.
VBAT
4.7â¦10uF
47uF
1uF
100nF
VS
RTG
VDD5V
100n
V1V8
100n
PS
VCC
Hall
sensor
IO4
VCC
IO5
VDRV
CLKO
HSBC2
HS2
BRMID2
HSBC1
HS1
BRMID1
100nF
VBAT
100nF
100nF
M
VCC
Temperature
sensor
SPI Interface
MLX
90316
10
LIN
SW0
SW1
SW3
SW4
SW5
SW6
SW7
IO0
IO1
IO2
IO3
LIN
180p
GND_LIN
GND_D
LS1
LS2
SW2
GND
SHNT_L
CWD
TI0
TI1
TO
GND_DRV
GND_A
Shunt
CWD
Figure 2 - Application circuitry for single DC-motor control
VBAT
Reverse
Polarity
Protection
MLX81100 â Product Abstract
Page 7 of 19
June 2012
Rev 021
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