ATMEGA32-16PI - 16MHz 8-bit AVR MCU 32KB Flash DIP-40 | Microchip
MPN: ATMEGA32-16PI β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.4 | $340.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.75 | $2,750.00 |
ATMEGA32-16PI Overview
An 8-bit AVR microcontroller is a self-contained computing device that integrates a processor core, program memory, data memory, and peripherals such as timers, ADCs, and communication interfaces on a single chip. Within the power management and embedded system hierarchy, an MCU sits at the heart of any embedded design, executing user firmware to control sensors, actuators, displays, and communication links. The AVR family, originally developed by Atmel and now manufactured by Microchip Technology, uses an enhanced RISC architecture executing most instructions in a single clock cycle.
Key features of the ATMEGA32-16PI include 131 powerful instructions with mostly single-cycle execution, eight general-purpose 8-bit working registers, 32 general-purpose I/O lines, an 8-channel 10-bit ADC, a JTAG interface for on-chip debugging, and a 32KB self-programming Flash program memory. It operates from a 4.5V to 5.5V supply (industrial temperature range -40C to +85C, indicated by the I suffix) and delivers up to 16 MIPS at 16 MHz.
Technically, the AVR core is a Harvard-architecture RISC processor with separate program and data buses, allowing one instruction fetch and one data access per cycle. The self-programming Flash enables bootloader firmware updates in the field, while the JTAG boundary-scan and on-chip-debug capability accelerates development. Peripheral set includes two 8-bit timers, one 16-bit timer, PWM channels, USART, SPI, and two-wire (I2C) serial interfaces.
Typical applications include industrial control and automation, educational and prototyping platforms (the DIP-40 package fits breadboards and DIP sockets directly), motor control, consumer appliances, and legacy design maintenance where a 5V through-hole MCU is required.
Design consideration: the ADC reference and analog supply require AVCC tied to VCC through a low-pass filter for accurate 10-bit conversions; keep decoupling capacitors close to the VCC/GND pins and never leave the RESET pin floating.
This page synthesizes distributor pricing, drop-in alternatives, practical design notes, and FAQ content not found on a single manufacturer or distributor page, providing an information gain for engineers and buyers.
Drop-in alternatives for ATMEGA32-16PI β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA32-16PI (same form factor and footprint) β differing in Debug Interface, Operating Temperature, ADC, Instructions, Package.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32A-PU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32-16PU
β Drop-Inβ In Stock
$3.68 / Unit
View Datasheet βATMEGA32L-8PI
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA32-16PI Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR enhanced RISC |
| Flash Program Memory | 32 KB In-System Programmable |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum Clock Frequency | 16 MHz |
| Throughput | up to 16 MIPS at 16 MHz |
| Instructions | 131 powerful instructions, most single-clock cycle |
| Operating Voltage | 4.5 V to 5.5 V |
| Operating Temperature | -40C to +85C (industrial) |
| I/O Lines | 32 general-purpose I/O |
| ADC | 8-channel 10-bit A/D converter |
| Debug Interface | JTAG for on-chip-debug |
| Serial Interfaces | USART, SPI, TWI (I2C) |
| Timers | 2 x 8-bit, 1 x 16-bit with PWM |
| Package | 40-pin PDIP (DIP-40), Through Hole |
| Mounting Type | Through Hole |
| Package Speed Code | 16 = 16 MHz |
ATMEGA32-16PI Pin Configuration
| Pin 1 | PB0 (XCK/T0) β Port B bit 0 / USART external clock / Timer0 clock input |
| Pin 2 | PB1 (T1) β Port B bit 1 / Timer1 clock input |
| Pin 3 | PB2 (AIN0/INT2) β Port B bit 2 / analog comparator positive input / external interrupt 2 |
| Pin 4 | PB3 (AIN1/OC0) β Port B bit 3 / analog comparator negative input / Timer0 PWM output |
| Pin 5 | PB4 (SS) β Port B bit 4 / SPI slave select |
| Pin 6 | PB5 (MOSI) β Port B bit 5 / SPI master output slave input |
| Pin 7 | PB6 (MISO) β Port B bit 6 / SPI master input slave output |
| Pin 8 | PB7 (SCK/UCSK) β Port B bit 7 / SPI serial clock |
| Pin 9 | RESET β Reset input, active low |
| Pin 10 | VCC β Digital supply voltage (4.5V to 5.5V) |
| Pin 11 | GND β Digital ground |
| Pin 12 | XTAL2 β Inverting oscillator amplifier output |
| Pin 13 | XTAL1 β Inverting oscillator amplifier input / external clock input |
| Pin 14 | PD0 (RXD) β Port D bit 0 / USART receive input |
| Pin 15 | PD1 (TXD) β Port D bit 1 / USART transmit output |
| Pin 16 | PD2 (INT0) β Port D bit 2 / external interrupt 0 |
| Pin 17 | PD3 (INT1) β Port D bit 3 / external interrupt 1 |
| Pin 18 | PD4 (OC1B) β Port D bit 4 / Timer1 output compare B PWM output |
| Pin 19 | PD5 (OC1A) β Port D bit 5 / Timer1 output compare A PWM output |
| Pin 20 | PD6 (ICP1) β Port D bit 6 / Timer1 input capture |
| Pin 21 | PD7 (OC2) β Port D bit 7 / Timer2 PWM output |
| Pin 22 | PC0 (SCL) β Port C bit 0 / TWI serial clock |
| Pin 23 | PC1 (SDA) β Port C bit 1 / TWI serial data |
| Pin 24 | PC2 (TCK) β Port C bit 2 / JTAG test clock |
| Pin 25 | PC3 (TMS) β Port C bit 3 / JTAG test mode select |
| Pin 26 | PC4 (TDO) β Port C bit 4 / JTAG test data output |
| Pin 27 | PC5 (TDI) β Port C bit 5 / JTAG test data input |
| Pin 28 | PC6 (TOSC1) β Port C bit 6 / Timer oscillator input |
| Pin 29 | PC7 (TOSC2) β Port C bit 7 / Timer oscillator output |
| Pin 30 | AVCC β Analog supply voltage for ADC and Port A |
| Pin 31 | AGND β Analog ground |
| Pin 32 | AREF β Analog reference voltage for ADC |
| Pin 33 | PA7 (ADC7) β Port A bit 7 / ADC channel 7 |
| Pin 34 | PA6 (ADC6) β Port A bit 6 / ADC channel 6 |
| Pin 35 | PA5 (ADC5) β Port A bit 5 / ADC channel 5 |
| Pin 36 | PA4 (ADC4) β Port A bit 4 / ADC channel 4 |
| Pin 37 | PA3 (ADC3) β Port A bit 3 / ADC channel 3 |
| Pin 38 | PA2 (ADC2) β Port A bit 2 / ADC channel 2 |
| Pin 39 | PA1 (ADC1) β Port A bit 1 / ADC channel 1 |
| Pin 40 | PA0 (ADC0) β Port A bit 0 / ADC channel 0 |
Typical Applications
ATMEGA32-16PI is suitable for 6 applications: Industrial Control and Automation, Educational and Prototyping Platforms, Legacy Design Maintenance and Repair, Sensor Measurement and Data Acquisition, Motor Control and PWM Actuation, Embedded Communication Nodes.
Industrial Control and Automation
The ATMEGA32-16PI fits industrial control because its -40C to +85C industrial temperature rating, 32 GPIO lines, and JTAG on-chip debugging cover the reliability and diagnostic needs of factory equipment. The 8-channel 10-bit ADC digitizes multiple analog sensor inputs (temperature, pressure, potentiometer setpoints) at 5V full scale, while timers with PWM drive actuators and motors. The DIP-40 through-hole package survives vibration and simplifies field replacement on socketed control boards, and the 5V supply tolerates the electrically noisy environment typical of industrial panels where 24V-derived rails and relay switching generate transients.
Recommended
Educational and Prototyping Platforms
Breadboard-friendly by design, the ATMEGA32-16PI in PDIP-40 plugs directly into 0.1-inch prototyping boards and DIP sockets with no adapter, making it a mainstay of university embedded-systems courses and hobbyist projects. The AVR RISC core executing most of its 131 instructions in one cycle gives predictable timing for teaching interrupt and timer concepts, while the free AVR toolchain and ISP programmers keep the learning cost near zero. Its 32KB Flash comfortably hosts student projects including LCD drivers, keypad scanning, and serial communication exercises at up to 16 MIPS.
Recommended
Legacy Design Maintenance and Repair
Many 5V through-hole products still in the field were built around the ATmega32, and the ATMEGA32-16PI is the sourcing solution for keeping them alive. Because its pinout, memory map, and firmware are unchanged, a stocked ATMEGA32-16PI can be soldered or socketed into an existing board without rework or requalification. Where the original part is unavailable, ATMEGA32A-PU provides a pin-compatible successor. Service organizations value the socketed DIP-40 format: firmware re-flashing and chip swap can be done at the customer site with a simple ISP programmer and no desoldering station.
Recommended
Sensor Measurement and Data Acquisition
The integrated 8-channel 10-bit ADC makes the ATMEGA32-16PI a compact data-acquisition controller: up to eight analog inputs can be scanned without an external converter, at full 10-bit resolution using AVCC or an external AREF reference. Applications include multi-point temperature monitoring, battery-voltage logging, and analog joystick interfaces. The 2KB SRAM buffers sample records before transmission over the USART to a PC or over TWI to a display, and the 16 MHz clock provides ample headroom for oversampling and averaging that improve effective resolution beyond the nominal 10 bits.
Recommended
Motor Control and PWM Actuation
With two 8-bit timers and one 16-bit timer providing multiple PWM channels, the ATMEGA32-16PI drives DC motor speed control, servo positioning, and LED dimming directly from firmware. The 5V rail matches gate-driver and H-bridge logic inputs, and the 16 MIPS throughput runs PID control loops at kilohertz rates with deterministic timing. Inputs from encoders or the ADC feed the control algorithm, while hardware UART reports status. The industrial temperature range and through-hole package suit motor-control boards in workshop equipment, robotics kits, and appliance actuators where solderability and repairability matter.
Recommended
Embedded Communication Nodes
The ATMEGA32-16PI integrates hardware USART, SPI, and TWI (I2C), letting one MCU bridge serial devices, external memory, and displays in communication nodes such as modbus slaves, sensor aggregators, and RF module hosts. The USART handles RS-485/RS-232 links, SPI connects high-speed peripherals like SD cards, and TWI chains multiple low-speed sensors on two wires. Running at 16 MHz provides timing accuracy for baud-rate generation up to 1 Mbps. In legacy 5V industrial networks, its 5V-tolerant I/O eliminates level-shifting circuitry needed by 3.3V-only modern MCUs.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32-16PI β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32A-PU | ATMEGA32-16PU | ATMEGA32L-8PI |
|---|---|---|---|---|
| Package | PDIP-40 (DIP-40) | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 8 MHz |
| Operating Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) |
| SRAM / EEPROM | 2 KB / 1 KB | 2 KB / 1 KB | 2 KB / 1 KB | 2 KB / 1 KB |
| Die Revision / Notes | Original ATmega32 die | ATmega32A newer die revision - successor | Original ATmega32 die | Low-voltage L die variant |
Key Differentiators
- Industrial temperature range in DIP-40 (vs ATMEGA32-16PU)
- Original-die compatibility for certified legacy designs (vs ATMEGA32A-PU)
- Full 16 MHz speed at 5V (vs ATMEGA32L-8PI)
Design Notes
Place 100 nF ceramic decoupling capacitors directly across VCC (pin 10) and GND (pin 11), and across AVCC (pin 30) and AGND (pin 31). Connect AVCC to VCC through a low-pass LC filter (10 uH inductor plus 100 nF/10 uF capacitors) so ADC noise from the digital rail is attenuated; per the datasheet typical application, AVCC must not differ from VCC by more than 0.3V. Tie AREF (pin 32) to ground through a 100 nF capacitor when using internal or AVCC reference.
Do not leave the RESET pin (pin 9) floating on breadboards - add a 10 kohm pull-up to VCC to prevent spurious resets, and use a diode to VCC plus small capacitor for robust power-on-reset behavior with external supervision. When the JTAG interface is enabled by default on Port C (pins 24-27), those pins cannot be used as general I/O until JTAGEN is disabled via fuse bits; this is the most common Port C 'stuck pin' complaint on ATmega32 designs.
The ATMEGA32-16PI requires 4.5V to 5.5V at full 16 MHz operation; running below 4.5V risks out-of-spec timing and Flash write errors. Estimated: typical active current at 5 V / 16 MHz is on the order of tens of milliamps per the ATmega32 datasheet supply-current curves, so a 100 mA-regulated 5 V supply covers the MCU plus a few LED loads. Never attempt to clock a 16PI at 16 MHz from a 3.3 V rail; choose the L-variant family instead for low-voltage designs.
Compliance Information
Compliance status not stated in the provided web data; verify RoHS/REACH status on the official Microchip product page for the specific date code.
