8-bit AVR Microcontrollers
ATmega48/V / 88/V / 168/V
DATASHEET SUMMARY
Introduction
The Atmel® ATmega48/V/ 88/V /168/V is a low-power CMOS 8-bit
microcontroller based on the AVR® enhanced RISC architecture. By
executing powerful instructions in a single clock cycle, the ATmega48/V/
88/V /168/V achieves throughputs close to 1MIPS per MHz. This empowers
system designer to optimize the device for power consumption versus
processing speed.
Feature
High Performance, Low Power Atmel®AVR® 8-Bit Microcontroller Family
•Advanced RISC Architecture
–131 Powerful Instructions
–Most Single Clock Cycle Execution
–32 x 8 General Purpose Working Registers
–Fully Static Operation
–Up to 20 MIPS Throughput at 20MHz
–On-chip 2-cycle Multiplier
•High Endurance Non-volatile Memory Segments
–4K/8K/16KBytes of In-System Self-Programmable Flash program
Memory
–256/512/512Bytes EEPROM
–512/1K/1KBytes Internal SRAM
–Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
–Data Retention: 20 years at 85°C/100 years at 25°C(1)
–Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program
• True Read-While-Write Operation
–Programming Lock for Software Security
•Atmel® QTouch® Library Support
–Capacitive Touch Buttons, Sliders and Wheels
–QTouch and QMatrix® Acquisition
–Up to 64 sense channels
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
•Peripheral Features
–Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode
–One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode
–Real Time Counter with Separate Oscillator
–Six PWM Channels
–8-channel 10-bit ADC in TQFP and QFN/MLF package
• Temperature Measurement
–6-channel 10-bit ADC in PDIP Package
• Temperature Measurement
–Two Master/Slave SPI Serial Interface
–One Programmable Serial USART
–One Byte-oriented 2-wire Serial Interface (Philips I2C compatible)
–Programmable Watchdog Timer with Separate On-chip Oscillator
–One On-chip Analog Comparator
–Interrupt and Wake-up on Pin Change
•Special Microcontroller Features
–Power-on Reset and Programmable Brown-out Detection
–Internal Calibrated Oscillator
–External and Internal Interrupt Sources
–Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and
Extended Standby
•I/O and Packages
–23 Programmable I/O Lines
–28-pin PDIP, 32-lead TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF
•Operating Voltage:
–2.7 - 5.5V for ATmega48/88/168
–1.8 - 5.5V for ATmega48V/88V/168V
•Temperature Range:
–-40°C to 85°C
•Speed Grade:
–ATmega48/88/168: 0 - 10MHz @ 2.7V - 5.5V, 0 - 20MHz @ 4.5V - 5.5V
–ATmega48V/88V/168V: 0 - 4MHz @ 1.8V - 5.5V, 0 - 10MHz @ 2.7V - 5.5V
•Power Consumption at 1MHz, 1.8V, 25°C
–Active Mode: 0.3mA
–Power-down Mode: 0.1μA
–Power-save Mode: 0.8μA (Including 32kHz RTC)
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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Table of Contents
Introduction......................................................................................................................1
Feature............................................................................................................................ 1
1. Description.................................................................................................................4
2. Configuration Summary............................................................................................. 5
3. Ordering Information .................................................................................................6
3.1. ATmega48/V.................................................................................................................................6
3.2. ATmega88/V.................................................................................................................................7
3.3. ATmega168/V...............................................................................................................................8
4. Block Diagram........................................................................................................... 9
5. Pin Configurations................................................................................................... 10
5.1. Pin-out........................................................................................................................................ 10
5.2. Pin Descriptions..........................................................................................................................13
6. I/O Multiplexing........................................................................................................15
7. Resources................................................................................................................17
8. Data Retention.........................................................................................................18
9. About Code Examples.............................................................................................19
10. Capacitive Touch Sensing....................................................................................... 20
10.1. QTouch Library........................................................................................................................... 20
11. Packaging Information.............................................................................................21
11.1. 32-pin 32A.................................................................................................................................. 21
11.2. 32-pin 32M1-A............................................................................................................................22
11.3. 28-pin 28M1................................................................................................................................23
11.4. 28-pin 28P3................................................................................................................................ 24
1. Description
The Atmel AVR® core combines a rich instruction set with 32 general purpose working registers. All the
32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers
to be accessed in a single instruction executed in one clock cycle. The resulting architecture is more code
efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The ATmega48/V/ 88/V /168/V provides the following features: 4K/8K/16Kbytes of In-System
Programmable Flash with Read-While-Write capabilities, 256/512/512bytes EEPROM, 512/1K/1Kbytes
SRAM, 23 general purpose I/O lines, 32 general purpose working registers, Real Time Counter (RTC),
three flexible Timer/Counters with compare modes and PWM, 1 serial programmable USARTs , 1 byte-
oriented 2-wire Serial Interface (I2C), a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF
packages) , a programmable Watchdog Timer with internal Oscillator, an SPI serial port, and six software
selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters,
SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents
but freezes the Oscillator, disabling all other chip functions until the next interrupt or hardware reset. In
Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base
while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O
modules except asynchronous timer and ADC to minimize switching noise during ADC conversions. In
Standby mode, the crystal/resonator oscillator is running while the rest of the device is sleeping. This
allows very fast start-up combined with low power consumption. In Extended Standby mode, both the
main oscillator and the asynchronous timer continue to run.
Atmel offers the QTouch® library for embedding capacitive touch buttons, sliders and wheels functionality
into AVR microcontrollers. The patented charge-transfer signal acquisition offers robust sensing and
includes fully debounced reporting of touch keys and includes Adjacent Key Suppression® (AKS™)
technology for unambiguous detection of key events. The easy-to-use QTouch Suite toolchain allows you
to explore, develop and debug your own touch applications.
The device is manufactured using Atmel’s high density non-volatile memory technology. The On-chip ISP
Flash allows the program memory to be reprogrammed In-System through an SPI serial interface, by a
conventional nonvolatile memory programmer, or by an On-chip Boot program running on the AVR core.
The Boot program can use any interface to download the application program in the Application Flash
memory. Software in the Boot Flash section will continue to run while the Application Flash section is
updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System
Self-Programmable Flash on a monolithic chip, the Atmel ATmega48/V/ 88/V /168/V is a powerful
microcontroller that provides a highly flexible and cost effective solution to many embedded control
applications.
The ATmega48/V/ 88/V /168/V is supported with a full suite of program and system development tools
including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit Emulators, and
Evaluation kits.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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2. Configuration Summary
Features ATmega48/V/ 88/V /168/V
Pin Count 28/32
Flash (Bytes) 4K/8K/16K
SRAM (Bytes) 512/1K/1K
EEPROM (Bytes) 256/512/512
Interrupt Vector Size (instruction word/vector) 1/1/2
General Purpose I/O Lines 23
SPI 2
TWI (I2C) 1
USART 1
ADC 10-bit 15kSPS
ADC Channels 8
8-bit Timer/Counters 2
16-bit Timer/Counters 1
ATmega88/V and ATmega168/V support a real Read-While-Write Self-Programming mechanism. There is
a separate Boot Loader Section, and the SPM instruction can only execute from there. In ATmega48/V,
there is no Read-While-Write support and no separate Boot Loader Section. The SPM instruction can
execute from the entire Flash.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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3. Ordering Information
3.1. ATmega48/V
Speed [MHz](3) Power Supply [V] Ordering Code(2) Package(1) Operational Range
10 1.8V - 5.5V ATmega48V-10AUR(5)
ATmega48V-10MUR(5)
ATmega48V-10AU
ATmega48V-10MMU
ATmega48V-10MMUR(5)
ATmega48V-10MMH(4)
ATmega48V-10MMHR(4)(5)
ATmega48V-10MU
ATmega48V-10PU
32A
32M1-A
32A
28M1
28M1
28M1
28M1
32M1-A
28P3
Industrial
(-40°C to 85°C)
20 2.7 - 5.5 ATmega48-20AUR(5)
ATmega48-20MUR(5)
ATmega48-20AU
ATmega48-20MMU
ATmega48-20MMUR(5)
ATmega48-20MMH(4)
ATmega48-20MMHR(4)(5)
ATmega48-20MU
ATmega48-20PU
32A
32M1-A
32A
28M1
28M1
28M1
28M1
32M1-A
28P3
Industrial
(-40°C to 85°C)
Note: 
1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for
detailed ordering information and minimum quantities.
2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances
(RoHS directive). Also Halide free and fully Green.
3. Please refer to Speed Grades for Speed vs. VCC
4. Tape & Reel.
5. NiPdAu Lead Finish.
Package Type
28M1 28-pad, 4 x 4 x 1.0 body, Lead Pitch 0.45mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/
MLF)
28P3 28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)
32M1-A 32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/
MLF)
32A 32-lead, Thin (1.0mm) Plastic Quad Flat Package (TQFP)
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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3.2. ATmega88/V
Speed [MHz](3) Power Supply [V] Ordering Code(2) Package(1) Operational Range
10 1.8V - 5.5V ATmega88V-10AUR(4)
ATmega88V-10MUR(4)
ATmega88V-10AU
ATmega88V-10MU
ATmega88V-10PU
32A
32M1-A
32A
32M1-A
28P3
Industrial
(-40°C to 85°C)
20 2.7 - 5.5 ATmega88-20AUR(4)
ATmega88-20MUR(4)
ATmega88-20AU
ATmega88-20MU
ATmega88-20PU
32A
32M1-A
32A
32M1-A
28P3
Industrial
(-40°C to 85°C)
Note: 
1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for
detailed ordering information and minimum quantities.
2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances
(RoHS directive). Also Halide free and fully Green.
3. Please refer to Speed Grades for Speed vs. VCC
4. Tape & Reel.
Package Type
28P3 28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)
32M1-A 32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/
MLF)
32A 32-lead, Thin (1.0mm) Plastic Quad Flat Package (TQFP)
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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3.3. ATmega168/V
Speed [MHz](3) Power Supply [V] Ordering Code(2) Package(1) Operational Range
10 1.8V - 5.5V ATmega168V-10AUR(4)
ATmega168V-10MUR(4)
ATmega168V-10AU
ATmega168V-10MU
ATmega168V-10PU
32A
32M1-A
32A
32M1-A
28P3
Industrial
(-40°C to 85°C)
20 2.7 - 5.5 ATmega168-20AUR(4)
ATmega168-20MUR(4)
ATmega168-20AU
ATmega168-20MU
ATmega168-20PU
32A
32M1-A
32A
32M1-A
28P3
Industrial
(-40°C to 85°C)
Note: 
1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for
detailed ordering information and minimum quantities.
2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances
(RoHS directive). Also Halide free and fully Green.
3. Please refer to Speed Grades for Speed vs. VCC
4. Tape & Reel.
Package Type
28P3 28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP)
32M1-A 32-pad, 5 x 5 x 1.0 body, Lead Pitch 0.50mm Quad Flat No-Lead/Micro Lead Frame Package (QFN/
MLF)
32A 32-lead, Thin (1.0mm) Plastic Quad Flat Package (TQFP)
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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4. Block Diagram
Figure 4-1. Block Diagram
CPU
USART 0
ADC
ADC[7:0]
AREF
RxD0
TxD0
XCK0
I/O
PORTS
D
A
T
A
B
U
S
GPIOR[2:0]
SRAM
OCD
EXTINT
FLASH
NVM
programming
debugWire
I
N
/
O
U
T
D
A
T
A
B
U
S
TC 0
(8-bit)
SPI 0
AC
AIN0
AIN1
ADCMUX
EEPROM
EEPROMIF
TC 1
(16-bit)
OC1A/B
T1
ICP1
TC 2
(8-bit async)
TWI 0 SDA0
SCL0
Internal
Reference
Watchdog
Timer
Power
management
and clock
control
VCC
GND
Clock generation
8MHz
Calib RC
128kHz int
osc
32.768kHz
XOSC
External
clock
Power
Supervision
POR/BOD &
RESET
XTAL2 /
TOSC2
RESET
XTAL1 /
TOSC1
16MHz LP
XOSC
PCINT[23:0]
INT[1:0]
T0
OC0A
OC0B
MISO0
MOSI0
SCK0
SS0
OC2A
OC2B
PB[7:0]
PC[6:0]
PD[7:0]
ADC6,ADC7,PC[5:0]
AREF
PD[7:0], PC[6:0], PB[7:0]
PD3, PD2
PB1, PB2
PD5
PB0
PB3
PD3
PD4
PD6
PD5
PB4
PB3
PB5
PB2
PD6
PD7
ADC6, ADC7
PC[5:0]
PD0
PD1
PD4
PC4
PC5
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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5. Pin Configurations
5.1. Pin-out
Figure 5-1. 28-pin PDIP
Power
Ground
Programming/debug
Digital
Analog
Crystal/Osc
(PCINT14/RESET) PC6
(PCINT16/RXD) PD0
(PCINT17/TXD) PD1
(PCINT18/INT0) PD2
(PCINT19/OC2B/INT1) PD3
(PCINT20/XCK/T0) PD4
VCC
GND
(PCINT6/XTAL1/TOSC1) PB6
(PCINT7/XTAL2/TOSC2) PB7
(PCINT21/OC0B/T1) PD5
(PCINT22/OC0A/AIN0) PD6
(PCINT23/AIN1) PD7
(PCINT0/CLKO/ICP1) PB0
PC5 (ADC5/SCL/PCINT13)
PC4 (ADC4/SDA/PCINT12)
PC3 (ADC3/PCINT11)
PC2 (ADC2/PCINT10)
PC1 (ADC1/PCINT9)
PC0 (ADC0/PCINT8)
GND
AREF
AVCC
PB5 (SCK/PCINT5)
PB4 (MISO/PCINT4)
PB3 (MOSI/OC2A/PCINT3)
PB2 (SS/OC1B/PCINT2)
PB1 (OC1A/PCINT1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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Figure 5-2. 28-pin MLF Top View
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PD2 (INT0/PCINT18)
PD1 (TXD/PCINT17)
PD0 (RXD/PCINT16)
PC6 (RESET/PCINT14)
PC5 (ADC5/SCL/PCINT13)
PC4 (ADC4/SDA/PCINT12)
PC3 (ADC3/PCINT11)
PC2 (ADC2/PCINT10)
PC1 (ADC1/PCINT9)
PC0 (ADC0/PCINT8)
GND
AREF
AVCC
PB5 (SCK/PCINT5)
(PCINT22/OC0A/AIN0) PD6
(PCINT23/AIN1) PD7
(PCINT0/CLKO/ICP1) PB0
(PCINT1/OC1A) PB1
(PCINT2/SS/OC1B) PB2
(PCINT3/OC2A/MOSI) PB3
(PCINT4/MISO) PB4
(PCINT19/OC2B/INT1) PD3
(PCINT20/XCK/T0) PD4
VCC
GND
(PCINT6/XTAL1/TOSC1) PB6
(PCINT7/XTAL2/TOSC2) PB7
(PCINT21/OC0B/T1) PD5
Bottom pad should be
soldered to ground
Power
Ground
Programming/debug
Digital
Analog
Crystal/CLK
21
20
19
18
17
16
15
28
27
26
25
24
23
22
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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Figure 5-3. 32-pin TQFP Top View
1
2
3
4
32
31
30
29
28
27
26
5
6
7
8
24
23
22
21
20
19
18
17
25
9
10
11
12
13
14
15
16
Power
Ground
Programming/debug
Digital
Analog
Crystal/CLK
(PCINT19/OC2B/INT1) PD3
(PCINT20/XCK/T0) PD4
GND
VCC
GND
VCC
(PCINT6/XTAL1/TOSC1) PB6
(PCINT7/XTAL2/TOSC2) PB7
PD2 (INT0/PCINT18)
PD1 (TXD/PCINT17)
PD0 (RXD/PCINT16)
PC6 (RESET/PCINT14)
PC5 (ADC5/SCL/PCINT13)
PC4 (ADC4/SDA/PCINT12)
PC3 (ADC3/PCINT11)
PC2 (ADC2/PCINT10)
PC1 (ADC1/PCINT9)
PC0 (ADC0/PCINT8)
ADC7
GND
AREF
ADC6
AVCC
PB5 (SCK/PCINT5)
(PCINT21/OC0B/T1) PD5
(PCINT22/OC0A/AIN0) PD6
(PCINT23/AIN1) PD7
(PCINT0/CLKO/ICP1) PB0
(PCINT1/OC1A) PB1
(PCINT2/SS/OC1B) PB2
(PCINT3/OC2A/MOSI) PB3
(PCINT4/MISO) PB4
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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Figure 5-4. 32-pin MLF Top View
1
2
3
4
32
31
30
29
28
27
26
5
6
7
8
24
23
22
21
20
19
18
17
25
9
10
11
12
13
14
15
16
PD2 (INT0/PCINT18)
PD1 (TXD/PCINT17)
PD0 (RXD/PCINT16)
PC6 (RESET/PCINT14)
PC5 (ADC5/SCL/PCINT13)
PC4 (ADC4/SDA/PCINT12)
PC3 (ADC3/PCINT11)
PC2 (ADC2/PCINT10)
PC1 (ADC1/PCINT9)
PC0 (ADC0/PCINT8)
ADC7
GND
AREF
ADC6
AVCC
PB5 (SCK/PCINT5)
(PCINT21/OC0B/T1) PD5
(PCINT22/OC0A/AIN0) PD6
(PCINT23/AIN1) PD7
(PCINT0/CLKO/ICP1) PB0
(PCINT1/OC1A) PB1
(PCINT2/SS/OC1B) PB2
(PCINT3/OC2A/MOSI) PB3
(PCINT4/MISO) PB4
(PCINT19/OC2B/INT1) PD3
(PCINT20/XCK/T0) PD4
GND
VCC
GND
VCC
(PCINT6/XTAL1/TOSC1) PB6
(PCINT7/XTAL2/TOSC2) PB7
Bottom pad should be
soldered to ground
Power
Ground
Programming/debug
Digital
Analog
Crystal/CLK
5.2. Pin Descriptions
5.2.1. VCC
Digital supply voltage.
5.2.2. GND
Ground.
5.2.3. Port B (PB[7:0]) XTAL1/XTAL2/TOSC1/TOSC2
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
B pins are tri-stated when a reset condition becomes active, even if the clock is not running.
Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscillator
amplifier and input to the internal clock operating circuit.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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Depending on the clock selection fuse settings, PB7 can be used as output from the inverting Oscillator
amplifier.
If the Internal Calibrated RC Oscillator is used as chip clock source, PB[7:6] is used as TOSC[2:1] input
for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set.
5.2.4. Port C (PC[5:0])
Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The PC[5:0]
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
C pins are tri-stated when a reset condition becomes active, even if the clock is not running.
5.2.5. PC6/RESET
If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical characteristics
of PC6 differ from those of the other pins of Port C.
If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low level on this pin for longer
than the minimum pulse length will generate a Reset, even if the clock is not running. Shorter pulses are
not guaranteed to generate a Reset.
The various special features of Port C are elaborated in the Alternate Functions of Port C section.
5.2.6. Port D (PD[7:0])
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
D pins are tri-stated when a reset condition becomes active, even if the clock is not running.
5.2.7. AVCC
AVCC is the supply voltage pin for the A/D Converter, PC[3:0], and PE[3:2]. It should be externally
connected to VCC, even if the ADC is not used. If the ADC is used, it should be connected to VCC through
a low-pass filter. Note that PC[6:4] use digital supply voltage, VCC.
5.2.8. AREF
AREF is the analog reference pin for the A/D Converter.
5.2.9. ADC[7:6] (TQFP and VFQFN Package Only)
In the TQFP and VFQFN package, ADC[7:6] serve as analog inputs to the A/D converter. These pins are
powered from the analog supply and serve as 10-bit ADC channels.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
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6. I/O Multiplexing
Each pin is by default controlled by the PORT as a general purpose I/O and alternatively it can be
assigned to one of the peripheral functions.
The following table describes the peripheral signals multiplexed to the PORT I/O pins.
Table 6-1. PORT Function Multiplexing
(32-pin
MLF/TQFP)
Pin#
(28-pin
MLF) Pin#
(28-pin
PIPD) Pin#
PAD EXTINT PCINT ADC/AC OSC T/C #0 T/C
#1
USART 0 I2C 0 SPI 0
1 1 5 PD[3] INT1 PCINT19 OC2B
2 2 6 PD[4] PCINT20 T0 XCK0
4 3 7 VCC
3 4 8 GND
6 - - VCC
5 - - GND
7 5 9 PB[6] PCINT6 XTAL1/
TOSC1
8 6 10 PB[7] PCINT7 XTAL2/
TOSC2
9 7 11 PD[5] PCINT21 OC0B T1
10 8 12 PD[6] PCINT22 AIN0 OC0A
11 9 13 PD[7] PCINT23 AIN1
12 10 14 PB[0] PCINT0 CLKO ICP1
13 11 15 PB[1] PCINT1 OC1A
14 12 16 PB[2] PCINT2 OC1B SS0
15 13 17 PB[3] PCINT3 OC2A MOSI0
16 14 18 PB[4] PCINT4 MISO0
17 15 19 PB[5] PCINT5 SCK0
18 16 20 AVCC
19 - - ADC6 ADC6
20 17 21 AREF
21 18 22 GND
22 - - ADC7 ADC7
23 19 13 PC[0] PCINT8 ADC0
24 20 24 PC[1] PCINT9 ADC1
25 21 25 PC[2] PCINT10 ADC2
26 22 26 PC[3] PCINT11 ADC3
27 23 27 PC[4] PCINT12 ADC4 SDA0
28 24 28 PC[5] PCINT13 ADC5 SCL0
29 25 1 PC[6]/
RESET
PCINT14
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
Atmel-2545W-ATmega48/V/88/V/168/V_Datasheet_Summary-11/2016
15
(32-pin
MLF/TQFP)
Pin#
(28-pin
MLF) Pin#
(28-pin
PIPD) Pin#
PAD EXTINT PCINT ADC/AC OSC T/C #0 T/C
#1
USART 0 I2C 0 SPI 0
30 26 2 PD[0] PCINT16 RXD0
31 27 3 PD[1] PCINT17 TXD0
32 28 4 PD[2] INT0 PCINT18
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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7. Resources
A comprehensive set of development tools, application notes, and datasheets are available for download
on http://www.atmel.com/avr.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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8. Data Retention
Reliability Qualification results show that the projected data retention failure rate is much less than 1 PPM
over 20 years at 85°C.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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9. About Code Examples
This documentation contains simple code examples that briefly show how to use various parts of the
device. These code examples assume that the part specific header file is included before compilation. Be
aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C
is compiler dependent. Confirm with the C compiler documentation for more details.
For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI” instructions
must be replaced with instructions that allow access to extended I/O. Typically “LDS” and “STS”
combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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19
10. Capacitive Touch Sensing
10.1. QTouch Library
The Atmel® QTouch® Library provides a simple to use solution to realize touch sensitive interfaces on
most Atmel AVR® microcontrollers. The QTouch Library includes support for the Atmel QTouch and Atmel
QMatrix® acquisition methods.
Touch sensing can be added to any application by linking the appropriate Atmel QTouch Library for the
AVR Microcontroller. This is done by using a simple set of APIs to define the touch channels and sensors,
and then calling the touch sensing API’s to retrieve the channel information and determine the touch
sensor states.
The QTouch Library is FREE and downloadable from the Atmel website at the following location: http://
www.atmel.com/technologies/touch/. For implementation details and other information, refer to the Atmel
QTouch Library User Guide - also available for download from the Atmel website.
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11. Packaging Information
11.1. 32-pin 32A
TITLE DRAWING NO. REV.
32A, 32-lead, 7 x 7mm body size, 1.0mm body thickness,
0.8mm lead pitch, thin profile plastic quad flat package (TQFP) C
32A
2010-10-20
PIN 1 IDENTIFIER
0°~7°
PIN 1
L
C
A1 A2 A
D1
D
eE1 E
B
Notes:
1. This package conforms to JEDEC reference MS-026, Variation ABA.
2. Dimensions D1 and E1 do not include mold protrusion. Allowable
protrusion is 0.25mm per side. Dimensions D1 and E1 are maximum
plastic body size dimensions including mold mismatch.
3. Lead coplanarity is 0.10mm maximum.
A – – 1.20
A1 0.05 – 0.15
A2 0.95 1.00 1.05
D 8.75 9.00 9.25
D1 6.90 7.00 7.10 Note 2
E 8.75 9.00 9.25
E1 6.90 7.00 7.10 Note 2
B 0.30 – 0.45
C 0.09 – 0.20
L 0.45 – 0.75
e 0.80 TYP
COMMON DIMENSIONS
(Unit of measure = mm)
SYMBOL MIN NOM MAX NOTE
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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11.2. 32-pin 32M1-A
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
D1
D
E1 E
e
b
A3
A2
A1
A
D2
E2
0.08 C
L
1
2
3
P
P
0
1
2
3
A 0.80 0.90 1.00
A1 – 0.02 0.05
A2 – 0.65 1.00
A3 0.20 REF
b 0.18 0.23 0.30
D
D1
D2 2.95 3.10 3.25
4.90 5.00 5.10
4.70 4.75 4.80
4.70 4.75 4.80
4.90 5.00 5.10
E
E1
E2 2.95 3.10 3.25
e 0.50 BSC
L 0.30 0.40 0.50
P – – 0.60
– – 12 o
Note : JEDEC Standard MO-220, Fig . 2 (Anvil Singulation), VHHD-2 .
TOP VIEW
SIDE VIEW
BOTTOM VIEW
0
Pin 1 ID
Pin #1 Notch
(0.20 R)
K 0.20 – –
K
K
32M1-A , 32-pad, 5 x 5 x 1.0mm Bod y, Lead Pitch 0.50mm ,
3.10mm Exposed P ad, Micro Lead Frame P a ckage (MLF) 32M1-A
03/14/2014
F
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11.3. 28-pin 28M1
TITLE DRAWING NO.GPC REV.
Package Drawing Contact:
packagedrawings@atmel.com 28M1ZBV B
28M1,28-pad, 4 x 4 x 1.0mm Body, Lead Pitch 0.45mm,
2.4 x 2.4mm Exposed Pad, Thermally Enhanced
Plastic Very Thin Quad Flat No Lead Package (VQFN)
10/24/08
SIDE VIEW
Pin 1 ID
BOTTOM VIEW
TOP VIEW
Note: The ter mi na l #1 ID is a Las er -ma r ked Feat ur e .
D
E
e
K
A1
C
A
D2
E2
y
L
1
2
3
b
1
2
3
0.45 COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
R 0.20
0.4 Ref
(4x)
A
A1
b
C
D
D2
E
E2
e
L
y
K
0.80 0.90 1.00
0.00 0.02 0.05
0.17 0.22 0.27
0.20 REF
3.95 4.00 4.05
2.35 2.40 2.45
3.95 4.00 4.05
2.35 2.40 2.45
0.45
0.35 0.40 0.45
0.00 – 0.08
0.20 – –
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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11.4. 28-pin 28P3
2325 Orchard Parkway
San Jose, CA 95131
TITLE DRAWING NO. REV.
28P3 , 28-lead (0.300"/7.62mm Wide) Plastic Dual
Inline Package (PDIP) B
28P3
09/28/01
0º ~ 15º
D
e
eB
B2
(4 PLACES)
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
A – – 4.5724
A1 0.508 – –
D 34.544 – 34.798 Note 1
E 7.620 – 8.255
E1 7.112 – 7.493 Note 1
B 0.381 – 0.533
B1 1.143 – 1.397
B2 0.762 – 1.143
L 3.175 – 3.429
C 0.203 – 0.356
eB – – 10.160
e 2.540 TYP
Note: 1. Dimensions D and E1 do not include mold Flash or Protrusion.
Mold Flash or Protrusion shall not exceed 0.25mm (0.010").
Atmel ATmega48/V / 88/V / 168/V [DATASHEET]
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