MLX81100_14 Datasheet, PDF (10/19 Pages) Melexis Microelectronic Systems – DC-Motor Controller

MLX81100
DC-Motor Controller
3.5 Dual DC-Motor Drive
In this sample application the IC realizes driving of 2 DC motor via an external power N-FETs 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; the reverse polarity protection of the bridge must be realized with an external power
FET connected to ground. Short circuit of the bridge will be detected with internal 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 switch-able battery voltage output VS. If there is a need to synchronize the motor
movement via longer distances it can be done via the serial interface connected to an external high speed
CAN transceiver as a physical layer.
Via this interface together with a proprietary protocol it
is possible that both motor drivers exchange real time position information. Optional it is possible to connect
an external EEPROM via serial interface, if the application can not use internal memories. This external
memory will be completely stay under API control by using pins of a digital port to create needed signal
waveforms for EEPROM.
100nF
100nF
VBAT
M
VBAT
Reverse
Polarity
Protection
Shunt
VDRV
CLKO
HSBC2
HS2
BRMID2
HSBC1
HS1
100nF
BRMID1
LS1
LS2
SW2
GND
SHNT_L
CWD
CWD
TI0
TI1
TO
GND
GND
VS
RTG
100nF
VDD5V
V1V8
100nF
100nF
PS
VCC
IO4
VCC
IO5
SW3
VBAT
4.7 ..10uF
47uF
1uF
VCC
Hall
sensor
Temperature
sensor
VBAT
4.7 ..10uF
47uF
1uF
VCC
Hall
sensor
100nF
VS
RTG
VDD5V
100nF
V1V8
100nF
PS
VCC
IO4
VCC
Temperature
sensor
IO5
SW3
SW4
SW5
SW6
SW7
SW0
SW1
IO0
IO1
IO2
IO3
LIN
GND
GND
VBAT VCC
INH
STB
TxD
RxD
HS-CAN
Transceiver
(TJA1041)
High speed
comunication Interface
with propietary protocol
CANH
CANL
CANH
CANL
VCC VBAT
HS-CAN
Transceiver
(TJA1041)
STB
RxD
TxD
EN
VCC
VCC
Optional
serial EEPROM
if needed for
security reason
Serial
EEPROM
CS
SCLK
SDOUT
SDIN
10
LIN
180p
SW4
SW5
SW6
SW7
SW0
SW1
IO0
IO1
IO2
IO3
LIN
GND
GND
VDRV
CLKO
HSBC2
HS2
BRMID2
HSBC1
HS1
BRMID1
LS1
LS2
SW2
GND
SHNT_L
CWD
TI0
TI1
TO
GND
GND
Application example for Dual DC motor driver
Figure 6 - Application circuitry for a dual DC-motor system
100nF
VBAT
100nF
100nF
M
Shunt
VBAT
Reverse
Polarity
Protection
CWD
MLX81100 – Product Abstract
Page 10 of 19
June 2012
Rev 021