MLX81205_15 Datasheet, PDF (10/18 Pages) Melexis Microelectronic Systems – BLDC Motor Controller

MLX81205/07
VBAT
VCC3
VS
RTG
VDDA
VDDD
LIN / PWM
LIN
VREF
CP2
CP1
CP0
VBAT_S1
VBAT_S2
HS0
U
LS0
VCC3
MLX81205 ^HS1
IO1
V
IO2
LS1
IOHV
OSC1
OSC2
HS2
TI0
W
TI1
TO
LS2
GNDA
VBAT
GNDD
T
GNDDRV
SHUNT
VPROT
U
VPROT
V
VPROT
W
U
V
LOW
W
GND
Figure 2 – Sensor-less BLDC Motor Control with MLX81205
The motor currents are measured by a shunt resistor in battery path. In case current exceeds the programmed threshold,
the bridge can be switched off automatically without software interaction and in addition a software interrupt can be
generated. The motor current can also be measured by the 10 bit ADC.
The patented Melexis TruSense technology combines two methods to determine the rotor position:
-
The measurement of the induced BEMF voltage at medium and high speeds
-
The measurement of position depending on coil inductance variations at stand-still and low speeds
390108120502
Rev. 4.7
Page 10 of 18
Product Abstract
11/2/2015