ATTINY261-20MU Atmel, ATTINY261-20MU Datasheet - Page 29
![IC MCU AVR 2K FLASH 20MHZ 32-QFN](/photos/12/13/121309/313-32-qfn_sml.jpg)
ATTINY261-20MU
Manufacturer Part Number
ATTINY261-20MU
Description
IC MCU AVR 2K FLASH 20MHZ 32-QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY261-20MU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Processor Series
ATTINY2x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
2-Wire, SPI, USI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
16
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 11 Channel
Package
32MLF EP
Device Core
AVR
Family Name
ATtiny
Maximum Speed
20 MHz
Operating Supply Voltage
3.3|5 V
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRBC100 - REF DESIGN KIT BATTERY CHARGER770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATSTK505 - ADAPTER KIT FOR 14PIN AVR MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY261-20MU
Manufacturer:
AVNET
Quantity:
20 000
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6.2.4
6.2.5
2588E–AVR–08/10
Internal 128 kHz Oscillator
Low-Frequency Crystal Oscillator
It is possible to reach a higher accuracy than factory calibration by changing the OSCCAL regis-
ter from software. See
this calibration is shown as User calibration in
When this oscillator is used as device clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see section
The 128 kHz internal oscillator is a low power oscillator providing a clock of 128 kHz. The fre-
quency depends on supply voltage, temperature and batch variations. This clock may be select
as the system clock by programming the CKSEL Fuses to “0011”.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 6-8.
Note:
To use a 32.768 kHz watch crystal as the clock source for the device, the low-frequency crystal
oscillator must be selected by setting CKSEL fuses to ‘0100’. The crystal should be connected
as shown in
When this oscillator is selected, start-up times are determined by the SUT fuses as shown in
Table
Table 6-9.
Notes:
The Low-frequency Crystal Oscillator provides an internal load capacitance, see
each TOSC pin.
Table 6-10.
SUT1:0
SUT1:0
ATtiny261/461/861
00
01
10
11
00
01
10
11
6-8.
6-9.
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
1. These options should be used only if frequency stability at start-up is not important.
Device
ensure programming mode can be entered.
Figure
Start-up Time from Power-
Start-up Times for the 128 kHz Internal Oscillator
Start-up Times for the Low Frequency Crystal Oscillator Clock Selection
Capacitance for Low-Frequency Crystal Oscillator
from Power Down
32K (32768) CK
down and Power-save
1K (1024) CK
1K (1024) CK
Start-up Time
6-4. To find suitable capacitors please consult the manufacturer’s datasheet.
“OSCCAL – Oscillator Calibration Register” on page
6 CK
6 CK
6 CK
“Calibration Byte” on page
(1)
(1)
32 kHz Osc. Type
System Osc.
Additional Delay
from Reset
Additional Delay from
64 ms
64 ms
Table 19-2 on page
4 ms
Reserved
Reserved
14CK + 64 ms
14CK + 4 ms
14CK
173.
Reset
Cap (Xtal1/Tosc1)
(1)
16 pF
Recommended usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
189.
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
32. The accuracy of
Cap (Xtal2/Tosc2)
Table 6-10
6 pF
29
at
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