STEVAL-IHM012V1 STMicroelectronics, STEVAL-IHM012V1 Datasheet - Page 13

• 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

UM0291
5.2
pwm_ar_timer_12bit.c
The AT timer in OF mode is used as the main time counter. This interrupt is handled in the
AR_TIMER_OF_Interrupt routine in the pwm_ar_timer_12bit module. This module
generates the PWM control signal to the frequency of 15 kHz, implements the high current
protection routine, and software counter incrementing (time base 68 µsec). See
Figure 7.
In the high current protection routine two reading operations in the same PWM OVF
interrupt are performed to detect an eventual over current event through the ADC analog
input. If the current signal is higher than threshold (Imax) the PWM output will be set to zero
and the LED will be turned ON.
Flowchart of the pwm_ar_timer_12bit module
1
Update DCRO register
Sensing Reading
pwm_ar_timer
<Imax
2
Counter++
Safe_batt
Enable=1
nd
RETURN
Isens
Current
Imax
0
<Imax
Sensing Reading
Set Duty Cycle
1
Count++
st
Isens
Current
Imax
High current protection
Zero PWM Signal
LED Turn ON
mode
Figure
Software
13/18
7.