ATTINY24A-MMH Atmel, ATTINY24A-MMH Datasheet - Page 28
ATTINY24A-MMH
Manufacturer Part Number
ATTINY24A-MMH
Description
MCU AVR 2K FLASH 20MHZ 20VQFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY24A-MMH
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
12
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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-MLF®, QFN
Processor Series
ATTINY2x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
SPI, USI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
12
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, 20 Channel
For Use With
ATSTK505 - ADAPTER KIT FOR 14PIN AVR MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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6.2.4
6.2.5
28
ATtiny24A/44A/84A
Low-Frequency Crystal Oscillator
Crystal Oscillator / Ceramic Resonator
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 ‘0110’. The crystal should be connected
as shown in
For this oscillator start-up times can be set with the SUT fuses, as shown in
Table 6-7.
Notes:
The Low-frequency Crystal Oscillator provides an internal load capacitance, see
each TOSC pin.
Table 6-8.
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be con-
figured for use as an On-chip Oscillator, as shown in
ceramic resonator may be used.
Figure 6-3.
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
SUT[1:0]
ATtiny24A/44A/84A
00
01
10
11
1. These options should be used only if frequency stability at start-up is not important.
Device
Figure
Start-up Times for the Low Frequency Crystal Oscillator Clock Selection
Capacitance of Low-Frequency Crystal Oscillator
from Power Down
Crystal Oscillator Connections
Start-up Time
6-3. To find suitable capacitors please consult the manufacturer’s datasheet.
1K CK
1K CK
32K CK
(1)
(1)
32 kHz Osc. Type
System Osc.
C2
C1
Additional Delay
from Reset
64 ms
64 ms
4 ms
Reserved
Cap (Xtal1/Tosc1)
XTAL2
XTAL1
GND
Figure 6-3
16 pF
Slowly rising power
Recommended usage
Fast rising power or BOD enabled
Stable frequency at start-up
Either a quartz crystal or a
Table
Cap (Xtal2/Tosc2)
8183C–AVR–03/11
6-7.
6 pF
Table 6-8
at
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