ATMEGA169-16MI - 16MHz 16KB Flash AVR MCU | Microchip Technology
MPN: ATMEGA169-16MI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.64 | $1,820.00 |
| 1,000 | $3.12 | $3,120.00 |
ATMEGA169-16MI Overview
An 8-bit AVR microcontroller is a reduced-instruction-set (RISC) single-chip computer belonging to the broader microcontroller hierarchy: MCU -> 8-bit MCU -> AVR ATmega family -> ATmega169 device. MCUs integrate a processor core, program memory, data memory, and peripherals on one die, making them the control heart of embedded systems such as consumer appliances, industrial sensors, and LCD-based human-machine interfaces.
Key features include 130 powerful instructions with mostly single-cycle execution, an 8-channel 10-bit analog-to-digital converter, a JTAG interface for on-chip debugging, and a built-in 4x25 segment LCD driver with dual-power operation, which is the ATmega169's defining peripheral compared with generic ATmega parts. Connectivity comprises SPI and UART/USART serial interfaces plus a Universal Serial Interface (USI).
Architecturally, the AVR core uses a Harvard structure with separate program and data buses, allowing one instruction per clock cycle while the next instruction is being fetched. The self-programming Flash enables field firmware updates through the boot loader section, and JTAG boundary scan supports production test per IEEE 1149.1 practices commonly used on ATmega 64-pin parts.
Typical applications include battery-powered devices with segment LCDs such as utility meters, handheld controllers, coffee machines and household appliances, as well as sensor nodes using the 10-bit ADC and low-power idle/power-down modes.
Design consideration: at 16 MHz operation the device is typically specified at a 4.5V to 5.5V supply; verify the voltage-versus-frequency curve in the datasheet before designing at reduced supply rails, and decouple AVCC separately for ADC accuracy.
This page synthesizes distributor stock signals, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATMEGA169-16MI — 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 ATMEGA169-16MI (same form factor and footprint) — differing in Package, Speed, Debug Interface, Instruction Set, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA169PA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →ATMEGA169PV-8MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA169-16MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$11.08 / Unit
View Datasheet →ATMEGA165V-8MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.65 / Unit
View Datasheet →ATMEGA325-16MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA169-16MI Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-Bit |
| Series | AVR ATmega |
| Maximum Clock Frequency | 16 MHz |
| Throughput | Up to 16 MIPS at 16 MHz |
| Flash Program Memory | 16 KB (8K x 16) |
| Flash Type | In-System Programmable, self-programming |
| SRAM | 1 KB |
| EEPROM | 512 Bytes |
| Instruction Set | 130 instructions, most single-cycle |
| ADC | 8-channel, 10-bit |
| LCD Driver | 4x25 segment |
| Debug Interface | JTAG for on-chip debug |
| Communication Interfaces | SPI, UART/USART, USI |
| Operating Temperature | -40C to +85C (I grade) |
| Package | 64-QFN (9x9 mm) with exposed pad (64-VFQFN EP) |
| Mounting Type | Surface Mount |
ATMEGA169-16MI 64-qfn (9x9 mm) with exposed pad (64-vfqfn ep) Pin Configuration Guide
Pin configuration for ATMEGA169-16MI (64-qfn (9x9 mm) with exposed pad (64-vfqfn ep) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA169-16MI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA169-16MI is suitable for 6 applications: Segment LCD Utility Meters, Handheld Controllers and Remote Keys, White Goods and Home Appliances, Industrial Sensor Nodes, Consumer Audio and Remote Display Panels, Automotive-Adjacent Body Electronics (Non-AEC-Q100).
Segment LCD Utility Meters
The ATMEGA169-16MI fits electricity, water, and gas meter front ends because its integrated 4x25 segment LCD driver directly drives the display with no external LCD controller, while the 8-channel 10-bit ADC digitizes current shunt or bridge sensor inputs at 10-bit resolution. In a typical metering design the MCU runs from a mains-derived supply with a battery-backed RTC domain, using power-down mode between measurement bursts. The 16 MHz clock gives headroom for pulse-counting and CRC-checked communication over the UART, while EEPROM stores calibration constants across power cycles. The 64-QFN exposed-pad package provides good thermal and ground bonding on low-cost two-layer PCBs.
Recommended
Handheld Controllers and Remote Keys
Battery-operated handheld controllers benefit from the ATMEGA169-16MI combination of LCD drive, low-power modes, and a small single-chip footprint. The 4x25 LCD driver renders menu text on segment displays, the USI and SPI ports scan keypads and drive peripherals, and the 1KB SRAM comfortably holds state machines plus small display buffers. Typical usage places the device in idle mode between keypresses, waking via external interrupts from the key matrix; the AVR interrupt structure wakes in one clock cycle. With the 16 KB self-programming Flash, field firmware updates can be delivered over the UART boot loader, reducing service cost in the field. Choose the PA revision for improved deep-sleep consumption in coin-cell designs.
Recommended
White Goods and Home Appliances
Appliance control boards - coffee machines, ovens, and washing machine user panels - use the ATMEGA169-16MI where a segment LCD, keypad, relay drive, and sensor input must coexist on one controller. The five GPIO ports (A through G, 64-pin allocation) provide enough lines to drive relays, triacs via optocouplers, and buzzer outputs while retaining the LCD segment lines. The 10-bit ADC reads NTC temperature sensors with ratiometric accuracy when AVCC is decoupled separately, and the industrial -40C to +85C temperature grade handles environments near heat sources. The JTAG interface supports on-chip debugging of the state-machine firmware directly on the populated production board, shortening appliance certification cycles.
Recommended
Industrial Sensor Nodes
In industrial monitoring nodes, the ATMEGA169-16MI samples up to eight analog channels through its 10-bit ADC at clock rates up to 16 MHz, while the SPI bus interfaces external Flash for data logging and the UART/USART links to RS-485 transceivers for Modbus-style networks. The 512-byte EEPROM retains node address and calibration data through power loss. Industrial temperature rating (-40C to +85C) matches unconditioned cabinets. The JTAG port enables boundary-scan production test of the populated PCB per common ATmega 64-pin practice, and power-down mode between polling windows keeps average consumption low on 24V-derived supplies. Keep ADC reference routing short and decouple AREF for noise immunity near switching loads.
Recommended
Consumer Audio and Remote Display Panels
Consumer products with simple numeric or bar-graph displays - radios, clock radios, chargers, and small instrument panels - use the ATMEGA169-16MI's LCD driver to render 4x25 segment content directly, avoiding an extra display driver IC and its I2C traffic. The 16 MHz core handles button debounce, tone generation, and UART communication to a host board, and 16 KB Flash accommodates feature-rich firmware with multiple language tables. The USI provides a lightweight serial link to front-panel daughter boards. Because the same QFN-64 footprint serves the whole ATmega169 family, one PCB supports commercial, industrial, and picoPower grades, letting product lines address multiple markets with a single validated layout.
Recommended
Automotive-Adjacent Body Electronics (Non-AEC-Q100)
For aftermarket and auxiliary body modules - seat controllers, gauge clusters, and accessory panels outside the core ECU - the ATMEGA169-16MI offers the industrial -40C to +85C grade and an LCD driver for simple cluster indicators. The 10-bit ADC reads potentiometer position sensors and battery-sense dividers, while the UART supports LIN-style master polling over a transceiver. Note that this part is not AEC-Q100 qualified; for certified automotive positions use a qualified automotive MCU family instead. The JTAG interface and 16 KB self-programming Flash allow diagnostics firmware and parameter sets to be updated in service, and the 64-QFN package withstands standard reflow soldering of body-electronics assemblies.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA169-16MI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA169PA-MU | ATMEGA169PV-8MU | ATMEGA169-16MU | ATMEGA165V-8MU | ATMEGA325-16MU |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) exposed pad | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Program Memory | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 32 KB |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 8 MHz | 16 MHz | 8 MHz | 16 MHz |
| SRAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB |
| JTAG Debug | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated 4x25 segment LCD driver removes external display controller (vs ATMEGA168PB-MU)
- 64-pin GPIO expansion across ports A-G (vs ATMEGA168-20MU)
- Same footprint path to picoPower efficiency (vs ATMEGA169PA-MU)
- Full 16 MHz operation vs low-voltage variants (vs ATMEGA169PV-8MU)
Design Notes
The 16 MHz speed grade of classic ATmega devices is tied to the upper supply range; operating near 5V with a 16 MHz clock is the safe envelope, while lower rails require reduced clock speeds. Verify the voltage-versus-frequency curve in the official ATmega169 datasheet electrical characteristics before fixing the regulator output, and if the board shares a 3.3V bus consider the V-variant (ATMEGA169PV-8MU) instead of under-clocking this grade.
Decouple each VCC pin with 100 nF ceramic capacitors placed within 2 mm of the pins, plus one bulk 4.7 uF to 10 uF per supply domain. Connect AVCC to VCC through a low-pass filter (ferrite bead plus 100 nF and 10 uF) for ADC accuracy, and route AREF with its own decoupling capacitor per datasheet recommendation. The exposed pad on the 64-QFN should be soldered to a grounded array of vias for mechanical strength and ground return, not left floating.
JTAG pins double as general-purpose I/O port C pins; if your firmware uses port C fully, disable JTAG via the fuse bit, otherwise input buffers on TCK/TMS/TDO/TDI stay active and consume extra current. Also remember that EEPROM writes wear at finite endurance - rate-limit calibration saves in metering applications. For low-power designs, configure unused port pins as inputs with pull-ups or driven outputs, never floating, to minimize leakage.
Keep the crystal (XTAL1/XTAL2) traces under 10 mm with guard ground and place the crystal load capacitors close to the pins to ensure reliable 16 MHz start-up. Segment LCD lines should be routed away from the ADC input traces; LCD drive waveform coupling into high-impedance analog inputs appears as ADC noise. When SPI runs to external Flash on a shared bus, use series 22 to 33 ohm resistors on SCK to tame ringing on longer traces.
Compliance Information
Compliance details were not present in the retrieved web data; confirm RoHS/REACH status on the official Microchip product page. This part is a general-purpose industrial MCU and is not marketed as AEC-Q100 automotive qualified.
