STEVAL-IHM012V1 STMicroelectronics, STEVAL-IHM012V1 Datasheet - Page 12

• Manufacturer Part Number: STEVAL-IHM012V1
• Description: EVAL BRD POWER MOSFET/8PIN MCU
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of STEVAL-IHM012V1

• Design Resources: STEVAL-IHM012V1 Gerber Files STEVAL-IHM012V1 Schematic STEVAL-IHM012V1 Bill of Materials
• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ST7FLITEUS5
• Primary Attributes: Brush DC Motors
• Secondary Attributes: DC Chopper
• Product: Power Management Modules
• Kit Application Type: Power Management - Motor Control
• Application Sub Type: BLDC Motor
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ST7FLiteUS5
• Other names: 497-5861

Software
Note:
5.1
Note:
12/18
The working principle of using a Power MOSFET to drive DC brush motor is to change the
duty cycle of the PWM control signal generated by the 12-bit autoreload timer (AT) inside the
software.
Before downloading firmware in the microcontroller, ensure that jumpers J1 and J2 are NOT
present before the input voltage is connected. Thus under normal conditions these jumpers
must be present before the input voltage is connected. See
Main.c
The battery voltage check function and the "Speed Pot" reading are implemented in this
module as described above. The reading of the "Speed Pot" and Safe Battery routine are
synchronized on the Overflow event (OVF interrupt) of the Auto-reload timer through the
"enable" flag.
Enable is true at the end of each OVF interrrupt.
The "Speed Pot" is read every 5 cycles (look at variable "count") of the Auto-reload timer.
The voltage battery is read every (10000 +1) cycles (look at the variable "counter") in
standard mode, and it will be read every (2000+1) cycles in battery safe mode.
in this way the "Speed Pot" reading and voltage battery reading won't be done in the same
PWM period.
The value of duty cycle is updated in the PWM AT OVF routine. See flowchart in
Figure 6.
Main programming flowchart
Disable Motor control
Safe_Batt = 1
System Reset
Fast Flashing
Can’t work
Waiting for
routine:
Motor
LED
<88%
Speed pot position
AR timer init
Variables init
Battery Level
Safe Batt = 0
full
While (on)
Enable = 0
ADC init
Ports init
Reading
Turn off
Voltage
Battery
MAIN
Enable
1
LED
0
<90%
Figure
Slow Flashing
LED
2.
Figure
UM0291
6.