Atmel ATtiny13, ATtiny13A Migrating from ATtiny13 to ATtiny13A

AVR520: Migrating from ATtiny13 to ATtiny13A

1 Introduction

In order to optimize the manufacturing process and to further reduce current
consumption, an optimized version of ATtiny13 has been introduced.

The ATtiny13A is a functionally identical, drop-in replacement for the ATtiny13. All
devices are subject to the same qualification process and same set of production
tests but since the manufacturing process is not the same, some electrical
characteristics differ. In addition, the performance of some analogue modules such
as the Brown-Out Detector (BOD) and Power-On Rest (POR) has been improved.
Some new features have also been added to the ATtiny13A.

ATtiny13 and ATtiny13A have separate data sheets. This application note aims to
outline the differences between the two devices and the data sheets, but there is
also a detailed change log to assist the user at the end of the ATtiny13A data
sheet. Remember to always use the latest revision of the device data sheet.

Minor differences in typical characteristics are not discussed in this document as
long as the low and high limits remain the same. For detailed information about the
typical characteristics, see sections “Electrical Characteristics” and “Typical
Characteristics” of the device datasheets.

8-bit
Microcontrollers

Application Note

Note: This application note serves as a guide to ease migration. For complete
device details, always refer to the most recent version of the ATtiny13A data
sheet.

Rev. 8157B-AVR-12/08

2 Changes in Characteristics

This section outlines such differences in characteristics that may have an effect on
the application in which the device is used. For detailed information, refer to the most
recent version of the device data sheets.

2.1 Current Consumption

Active and Idle mode current consumption of the device have been reduced. The
tables below present typical current consumption figures at room temperature. All
values are taken from device data sheets, unless otherwise noted.

Table 2-1. Typical Current Consumption of Device at Room Temperature

Mode Condition ATtiny13 ATtiny13A Change

Active

Idle

Reset

VCC=1.8V, f=1 MHz 240 µA 190 µA - 20%

VCC=5.5V , f=20 MHz 13 mA 8.8 mA - 30%

VCC=1.8V, f=1 MHz 220 µA 24 µA - 90%

=5.5V , f=20 MHz 4.0 mA 1.7 mA - 60%

V

CC

VCC=1.8V, f=1 MHz 7 µA 5 µA - 30%

=5.5V , f=20 MHz 2.9 mA 1.25 mA - 60%

V

CC

2.2 VOL/VOH Levels

Table 2-2. Typical Current Consumption of Peripherals at Room Temperature

Peripheral Condition ATtiny13 ATtiny13A Change

Analogue
Comparator

Analogue-to-Digital
Converter

Brown-Out Detector

VCC=1.8V 60 µA 60 µA ± 0%

=5.5V 130 µA 80 µA - 40%

V

CC

VCC=1.8V 180 µA

=5.5V 400 µA

V

CC

(1)

170 µA - 5%

(1)

360 µA - 10%

VCC=1.8V 21 µA 16 µA - 25%

VCC=5.5V 28 µA 23 µA - 20%

Notes: 1. These values were obtained using the same device configuration and test

bench as with ATtiny13A. Values in ATtiny13 data sheet were obtained using a
different set up.

In Table 2-3 are listed differences in output low and high voltage levels.

Table 2-3. Changes to VOL and VOH Levels

Symbol Parameter Condition

VOL Pins PB0:4

VOH Pins PB0:1

IOL=20mA, VCC=5V - 0.7 - 0.8 V

=10mA, VCC=3V - 0.5 - 0.6 V

I

OL

IOH=-20mA, VCC=5V 4.2 - 4.0 - V

=-10mA, VCC=3V 2.5 - 2.3 - V

I

OH

ATtiny13 ATtiny13A

Min Max Min Max

Unit

2

AVR520

8157B-AVR-12/08

2.3 Reset

Table 2-4 summarizes the differences between the reset circuitry of ATtiny13 and that
of ATtiny13A.

Table 2-4. Power-On Reset

Symbol

V

POR

V

POA

SRON - - - 0.01 - - V/ms

3 New Bits and Registers

In Table 3-1 are listed registers and bits that have been added to the device as a
result of functional enhancements. In ATtiny13 these bits and registers were marked
as reserved.

Table 3-1. New Bits and Registers

Addr. Name Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7 Bit 7

0x30 BODCR - - - - - - BODS BODSE

0x25 PRR - - - - - - PRTIM0 PRADC

ATtiny13 ATtiny13A

Min Typ Max Min Typ Max

- 1.2 - 1.1 1.4 1.6 V

- 1.1 - 0.6 1.3 1.6 V

AVR520

Unit

For more details on the functional enhancements, see ATtiny13A data sheet.

4 Summary of Changes

For a summary of changes, see the revision history at the end of the ATtiny13A data
sheet.

8157B-AVR-12/08

3

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8157B-AVR-12/08