AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 152

• Manufacturer Part Number: AT90PWM81-16MF
• Description: IC MCU AVR 8K FLASH ISP 32QFN
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16MF

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 32-MLF®, QFN
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.5.2.1
152
AT90PWM81
Four Ramp Mode
The waveform frequency is defined by the following equation:
In Four Ramp mode, each time in a cycle has its own definition
Figure 13-4.
The input clock of PSCR is given by CLKPSC.
PSCOUTr0 and PSCOUTr1 signals are defined by On-Time 0, Dead-Time 0, On-Time 1 and Dead-Time
1 values with :
On-Time 0 = OCRrRAH/L * 1/Fclkpsc
On-Time 1 = OCRrRBH/L * 1/Fclkpsc
Dead-Time 0 = (OCRrSAH/L + 2) * 1/Fclkpsc
Dead-Time 1 = (OCRrSBH/L + 2) * 1/Fclkpsc
Note:
PSC Counter
PSCOUTn0
PSCOUTn1
Minimal value for Dead-Time 0 and Dead-Time 1 = 2 * 1/Fclkpsc
OCRnSA
0
PSCr0 & PSCr1 Basic Waveforms in Four Ramp mode
Dead-Time 0
f
PSCn
=
On-Time 0
----------------------------- -
PSCnCycle
PSC Cycle
1
OCRnRA
=
-------------------------------------------------------------------- -
(
0
OT0
OCRnSB
Dead-Time 1
+
OT1
f
CLK_PSCn
+
DT0
On-Time 1
OCRnRB
+
DT1
)
7734P–AVR–08/10