ST7FMC2R6T6 STMicroelectronics, ST7FMC2R6T6 Datasheet - Page 180

• Manufacturer Part Number: ST7FMC2R6T6
• Description: MCU 8BIT 32K FLASH 64TQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FMC2R6T6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: LINSCI, SPI
• Peripherals: LVD, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 44
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Processor Series: ST7FMC2x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 60
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7MC-KIT/BLDC, ST7MDT50-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• For Use With: 497-8402 - BOARD EVAL COMPLETE INVERTER497-8400 - KIT IGBT PWR MODULE CTRL ST7MC497-6408 - BOARD EVAL BLDC SENSORLESS MOTOR497-4734 - EVAL KIT 3KW POWER DRIVER BOARD497-4733 - EVAL KIT 1KW POWER DRIVER BOARD497-4732 - EVAL KIT 300W POWER DRIVER BOARD497-4731 - EVAL KIT PWR DRIVER CONTROL BRD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-4868

ST7MC1xx/ST7MC2xx
MOTOR CONTROLLER (Cont’d)
10.6.7.5 Speed Measurement Mode
Motor speed can be measured using two methods
depending on sensor type: period measurement or
pulse counting. Typical sensor handling is de-
scribed here.
Incremental encoders allows accurate speed
measurement by providing a large number of puls-
es per revolution (ppr) with ppr rates up to several
thousands; the higher the ppr rate, the higher the
resolution. The proposed method consists of
Figure 99. Tachogenerator period acquisition using MTIM timer
Figure 100. Encoder Clock frequency measure using MTIM timer
180/309
1
(triggered by software
C
C
or Real-time Clock)
MTIM Counter
Comparator
Capture
MTIM Counter
Interrupts
Compare
Capture
Output
Tacho
Value
Value
Interrupts
Encoder
Value
Clock
To interrupt generator
To interrupt generator
(Capture Event)
(Capture Event)
C
C
C
C
C
S
C
To interrupt generator
(Speed Error Event)
Decreasing Speed
C
Decreasing Speed
C
counting the number of clock cycles issued by the
Incremental Encoder Interface (Encoder Clock)
during a fixed time window (refer to
The tachogenerator has a much lower ppr rate
than the encoder (typically factor 10). In this con-
text, it is more meaningful to measure the period
between Tacho Captures (i.e. relevant transitions
of the incoming signals). Accuracy is imposed by
the reference clock, i.e. the CPU clock (refer to
Figure
C
99).
C
C
C
S
Figure
C
100).
C