AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 31
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
Available stocks
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Manufacturer
Quantity
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Part Number:
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Manufacturer:
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5.2.2.1
5.2.3
5.2.4
7734P–AVR–08/10
128 KHz Internal Oscillator
Crystal Oscillator
RC Oscillator calibration at Factory
The RC oscillator is calibrated at 3V, 25°C for an 8MHz target frequency with an Accuracy +/- 1%.
The corresponding value OSCAL (@Amb.) is stored in the signature row and automatically loaded in the
OSCAL register at reset.
The RC oscillator is monitored at 105°C or 125°C (versus Product version) with an accuracy within
+/- 5% limits.
The 128 KHz internal Oscillator is a low power Oscillator providing a clock of 128 KHz. The frequency is
nominal at 3V and 25°C. This clock may be select as the system clock by programming CKSEL Fuses or
CSEL field as shown in
When this clock source is selected, start-up times are determined by the SUT Fuses or by CSUT field as
shown in
Table 5-5.
Notes:
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured
for use as an On-chip Oscillator, as shown in
may be used.
C1 and C2 should always be equal for both crystals and resonators. The optimal value of the capacitors
depends on the crystal or resonator in use, the amount of stray capacitance, and the electromagnetic noise
of the environment. Some initial guidelines for choosing capacitors for use with crystals are given in
Table
Figure 5-2.
CSUT1..0
SUT1..0
5-6. For ceramic resonators, the capacitor values given by the manufacturer should be used.
00
01
10
11
1. Flash Fuse bits
2. CLKSELR register bits
Table
(1)
(4)
5-5.
Start-up Times for the 128 kHz Internal Oscillator
Crystal Oscillator Connections
Start-up Time from Power-down
Table 5-1 on page
6 CK
6 CK
6 CK
28.
C2
C1
Figure
5-2. Either a quartz crystal or a ceramic resonator
Additional Delay
Reserved
14CK + 64 ms
14CK + 4 ms
from Reset
XTAL2
XTAL1
GND
14CK
AT90PWM81
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
31
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