MLX81100
LIN Slave for FET Control
3.5 Dual DC-Motor Drive
In this sample application the IC can realize the driving of two DC-motors via an external power N-FET
bridge. The high side N-FET driving is done 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. 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 switchable battery voltage
output. If it is necessary to synchronize the motor movement via longer distances it can be done via the
UART interface connected to an external high speed can transceiver. Via this interface together with a
proprietary protocol it is possible that both motor-driver exchange real-time position information. Optional it is
possible to connect an external serial EEPROM via a SPI interface, if it isn’t allowed to use the integrated
EEPROM because of security reasons.
100nF
100nF
VDRV
100nF
VS
RTG
VDD5V
47uF
4.7 ..10uF
V
BAT
V
BAT
4.7 ..10uF
VS
RTG
VDD5V
47uF
100nF
VDRV
CLKO
HSBC2
100nF
100nF
CLKO
HSBC2
100nF
HS2
BRMID2
V
BAT
PS
V1V8
100nF
HS2
V1V8
BRMID2
V
BAT
PS
1uF
100nF
1uF
100nF
V
CC
V
CC
V
CC
Hall
sensor
V
CC
V
CC
HSBC1
HS1
IO4
IO4
V
CC
HSBC1
HS1
MLX81100
MLX81100
Hall
sensor
100nF
M
IO5
SW3
SW4
SW5
SW6
SW7
SW0
SW1
IO0
IO1
IO2
IO3
LIN
INH
STB
TxD
HS-CAN
Transceiver
(TJA1041)
VBAT VCC
BRMID1
Temperature
sensor
Temperature
sensor
IO5
SW3
100nF
BRMID1
M
LS1
High speed
comunication Interface
with propietary protocol
CANH
CANL
CANH
CANL
VCC VBAT
SW4
SW5
SW6
STB
RxD
TxD
LS1
LS2
SW2
V
BAT
Reverse
Polarity
Protection
C
WD
RxD
HS-CAN
Transceiver
(TJA1041)
SW7
SW0
SW1
LS2
SW2
GND
Shunt
V
BAT
Reverse
Polarity
Protection
C
WD
Shunt
GND
EN
VCC
VCC
Optional
serial EEPROM
if needed for
security reason
Serial
EEPROM
CS
SCLK
SDOUT
SDIN
SHNT_L
CWD
TI0
TI1
TO
GND
GND
IO0
IO1
IO2
IO3
LIN
SHNT_L
CWD
TI0
TI1
TO
GND
GND
10
LIN
180p
GND
GND
GND
GND
Application example for Dual DC motor driver
Figure 6 - Application circuitry for a dual DC-motor system
MLX81100 – Product Abstract
Page 8 of 15
July 2007
Rev 015
MELEXIS [ Melexis Microelectronic Systems ]
