AN1905 ST Microelectronics, Inc., AN1905 Datasheet - Page 21

• Manufacturer Part Number: AN1905
• Description: St7mc Three-phase BLDC Motor Control Software Library
• Manufacturer: ST Microelectronics, Inc.

3.5 USING YOUR OWN POWER STAGE
In order to configure the standalone library to match any kind of power stage, care should be
taken to observe the logic input diagrams of the drivers. The starter kit uses three L6386 high-
voltage high and low side drivers; other devices may require adjustments, depending on
whether their logical inputs are active low or high. The ‘MPOL’ register has then to be set man-
ually in the firmware. Modifications can be done in the ‘MTC_InitPeripheral’ routine (see
Figure
output states during reset).
Figure 9. MPOL register configuration
The starter kit can also be connected directly to an external power stage using the socket J6
(26 pins).
3.6 CHECKING THE CURRENT SENSOR RESISTOR VALUE
The starter kit comes with a current sensor resistor of 0.047 Ohm (R21 on the schematic, see
Figure
when the voltage on this resistor has reached a limit (see
mode
figured as a non-inverter amplifier (see R66 and R67 values).
void MTC_InitPeripheral(void)
{
device characteristics
for more details). This voltage is amplified by a factor of 11 by the internal OPAMP con-
10). The current limiter of the MTC cell relies on a comparator that turns off the PWM
9). It has to be noted also that the option byte has to be updated accordingly (MCO
MTC_ResetPeripheral();
// Initialize registers in page 1 first
SET_MTC_PAGE(1);
MCONF = mem_MCONF;
MPWME = (u8)(mem_MPWME | DG_MSK); //Force output of debug signal
MPOL = ALL_ACTIVE_HIGH;
ST7MC THREE-PHASE BLDC MOTOR CONTROL SOFTWARE LIBRARY
// (L6386D) <-- to be updated according to your own
// ZVD bit=0; Z and D have opposite edge
Section 7.2.1 Voltage versus current
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