AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 32

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• 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 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Timers: 1
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Height: 2.35 mm
• Length: 13 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7.6 mm
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

32
AT90PWM81
The Oscillator can operate in three different modes, each optimized for a specific frequency range. The
operating mode is selected by CKSEL3..1 fuses or by CSEL3..1 field as shown in
Table 5-6.
Notes:
The CKSEL0 Fuse together with the SUT1..0 Fuses or CSEL0 together with CSUT1..0 field select the
start-up times as shown in
Table 5-7.
Notes:
CKSEL0
CSEL0
CKSEL3..1
CSEL3..1
0
0
0
0
1
1
1
1
100
101
110
111
1. Flash Fuse bits.
2. CLKSELR register bits.
3. This option should not be used with crystals, only with ceramic resonators.
1. Flash Fuse bits.
2. CLKSELR register bits.
3. These options should only be used when not operating close to the maximum frequency of the device,
4. These options are intended for use with ceramic resonators and will ensure frequency stability at start-
(2)
(1)
(3)
and only if frequency stability at start-up is not important for the application. These options are not suit-
able for crystals.
up. They can also be used with crystals when not operating close to the maximum frequency of the
device, and if frequency stability at start-up is not important for the application.
(2)
(1)
Crystal Oscillator Operating Modes
Start-up Times for the Crystal Oscillator Clock Selection
CSUT1..0
SUT1..0
00
01
10
00
01
10
11
11
Frequency Range (MHz)
(1)
(2)
Table
8.0 - 16.0
5-7.
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
Start-up Time from
Power-down and
16K (16384) CK
16K (16384) CK
16K (16384) CK
1K (1024) CK
1K (1024)CK
1K (1024)CK
Power-save
258 CK
258 CK
(3)
(3)
(4)
(4)
(4)
Additional Delay
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 4.1 ms
14CK + 65 ms
14CK + 65 ms
14CK + 65 ms
(Vcc = 5.0V)
from Reset
C1 and C2 for Use with Crystals (pF)
Recommended Range for Capacitors
14CK
14CK
12 - 22
12 - 22
12 - 22
Recommended Usage
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
Ceramic resonator, BOD
enabled
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
Crystal Oscillator, BOD
enabled
Crystal Oscillator, fast
rising power
Crystal Oscillator, slowly
rising power
–
Table
5-6.
7734P–AVR–08/10