AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 110
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AT90PWM81-16MF
Manufacturer Part Number
AT90PWM81-16MF
Description
IC MCU AVR 8K FLASH ISP 32QFN
Manufacturer
Atmel
Series
AVR® 90PWM Lightingr
Datasheet
1.AT90PWM81-16MN.pdf
(325 pages)
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
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Manufacturer
Quantity
Price
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Part Number:
AT90PWM81-16MF
Manufacturer:
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12.7
110
Enhanced Resolution
AT90PWM81
Lamp Ballast applications need an enhanced resolution down to 50Hz. The method to improve the normal
resolution is based on Flank Width Modulation (also called Fractional Divider). Cycles are grouped into
frames of 16 cycles. Cycles are modulated by a sequence given by the fractional divider number. The
resulting output frequency is the average of the frequencies in the frame. The fractional divider (d) is
given by OCRnRB[15:12].
The PSC output period is directly equal to the PSCOUTn0 On Time + Dead Time (OT0+DT0) and
PSCOUTn1 On Time + Dead Time (OT1+DT1) values. These values are 12 bits numbers. The frequency
adjustment can only be done in steps like the dedicated counters. The step width is defined as the fre-
quency difference between two neighboring PSC frequencies.
It is possible to apply the Flank Width Modulation (FWM) on RB, RB+RA, SB, SB+SA. The selection is
done bit the bits PBFMn0 and PBFMn.
According to the ramp mode and the enhanced resolution mode (defined by PBFMn1:0), the frequency
difference Δf can take three different values:
with k is the number of CLK
with f
Example, in normal mode, with maximum operating frequency 160 kHz and f
The resulting resolution is Delta F equals 64MHz / 400 / 401 = 400 Hz.
In enhanced mode, the output frequency is the average of the frame formed by the 16 consecutive cycles.
f
Then the frequency resolution is divided by 16. In the example above, the resolution equals 25 Hz.
b1
and f
OP
b2
is the output operating frequency.
are two neighboring base frequencies.
PSC
Δf1
Δf2
period in a PSC cycle and is given by the following formula:
=
=
f
AVERAGE
f
f1 f2
f1 f2
AVERAGE
–
–
=
=
=
=
f
----------
f
----------
16 d
-------------- -
PSC
PSC
k
k
k
16 d
-------------- -
16
Δf
–
=
16
–
–
–
=
f
----------
f
×
----------- -
k
----------- -
k
PSC
f
f
OP
PSC
PSC
0
+
+
×
f
--------- -
PLL
k
1
2
f
b1
=
=
+
+
----- -
16
----- -
16
f
f
d
d
PSC
PSC
×
×
----------- -
k
f
f
×
×
b2
PLL
+
-------------------
k k
-------------------
k k
1
(
(
1
2
+
+
1
2
)
)
PLL
= 64 Mhz, k equals 400.
7734P–AVR–08/10
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