ATTINY45-20XU Atmel, ATTINY45-20XU Datasheet - Page 20
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ATTINY45-20XU
Manufacturer Part Number
ATTINY45-20XU
Description
IC MCU AVR 4K FLASH 20MHZ 8TSSOP
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY45-20XU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
6
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-TSSOP
Processor Series
ATTINY4x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
256 B
Maximum Operating Temperature
+ 85 C
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
For Use With
ATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIPATAVRBC100 - REF DESIGN KIT BATTERY CHARGER770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
8.2
8.2.1
8.2.2
8.2.3
20
Errata ATtiny45
ATtiny25/45/85
Rev F and G
Rev D and E
Rev B and C
The revision letter in this section refers to the revision of the ATtiny45 device.
No known errata
•
1. EEPROM read may fail at low supply voltage / low clock frequency
•
•
•
•
1. PLL not locking
2. EEPROM read from application code does not work in Lock Bit Mode 3
3. EEPROM read may fail at low supply voltage / low clock frequency
EEPROM read may fail at low supply voltage / low clock frequency
PLL not locking
EEPROM read from application code does not work in Lock Bit Mode 3
EEPROM read may fail at low supply voltage / low clock frequency
Timer Counter 1 PWM output generation on OC1B- XOC1B does not work correctly
Trying to read EEPROM at low clock frequencies and/or low supply voltage may result in
invalid data.
Problem Fix/Workaround
Do not use the EEPROM when clock frequency is below 1 MHz and supply voltage is below
2V. If operating frequency can not be raised above 1 MHz then supply voltage should be
more than 3V. Similarly, if supply voltage can not be raised above 2V then operating fre-
quency should be more than 2 MHz.
This feature is known to be temperature dependent but it has not been characterised.
Guidelines are given for room temperature, only.
When at frequencies below 6.0 MHz, the PLL will not lock
Problem fix / Workaround
When using the PLL, run at 6.0 MHz or higher.
When the Memory Lock Bits LB2 and LB1 are programmed to mode 3, EEPROM read does
not work from the application code.
Problem Fix/Work around
Do not set Lock Bit Protection Mode 3 when the application code needs to read from
EEPROM.
Trying to read EEPROM at low clock frequencies and/or low supply voltage may result in
invalid data.
Problem Fix/Workaround
Do not use the EEPROM when clock frequency is below 1 MHz and supply voltage is below
2V. If operating frequency can not be raised above 1 MHz then supply voltage should be
2586M–AVR–07/10