ATMEGA640V-8CUR - 8MHz AVR 64KB MCU 100-CBGA | Microchip
N.º de pieza: ATMEGA640V-8CUR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.75 | $4,75 |
| 10 | $4.45 | $44,50 |
| 100 | $4.3 | $430,00 |
| 500 | $4.15 | $2.075,00 |
| 1.000 | $4.02 | $4.020,00 |
ATMEGA640V-8CUR Descripción general
An 8-bit microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and peripherals on a single die, executing one instruction per clock cycle in the AVR RISC architecture. MCUs sit at the lowest level of the embedded system hierarchy - above discrete logic and below application processors - and are the workhorse of industrial control, instrumentation, and consumer electronics. The ATmega640 belongs to the megaAVR family, the large-pin-count branch of the AVR product line.
Key features include 64 KB of self-programmable ISP Flash, 86 general purpose I/O lines, 32 general purpose working registers, a real-time counter, six flexible timer/counters, and in-circuit serial programming (ICSP) via just two device I/O pins plus reset. The V-suffix device supports the extended low-voltage operating range (1.8 V minimum), enabling battery-powered and low-voltage industrial designs.
Architecturally, the AVR core executes most instructions in a single clock cycle through a Harvard-architecture pipeline with separate program and data buses, giving high code efficiency and deterministic timing. The device integrates JTAG-based on-chip debugging and supports the MPLAB Snap programmer through the 8-pin SIL ICSP connector.
Typical applications include industrial automation controllers, building management nodes, instrumentation front ends, and battery-operated monitoring systems where the wide 1.8 V to 5.5 V supply range and low-power sleep modes are decisive.
Design consideration: clock speed derates with supply voltage - 8 MHz is safe across the full 1.8 V to 5.5 V range, but verify the voltage-frequency curve if migrating to the 16 MHz ATMEGA640 variants.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-18.
Alternativas directas para ATMEGA640V-8CUR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA640V-8CUR (mismo factor de forma y huella) — difiere en Flash Memory, Program Memory Size, Program Memory Type, Package, ADC.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA640-16CUR
✅ Sustitución directa✓ En stock
$6.72 / unidad
Ver hoja de datos →ATMEGA640V-8CU
✅ Sustitución directa✓ En stock
$8.36 / unidad
Ver hoja de datos →ATMEGA1280-16CUR
✅ Sustitución directa✓ En stock
$6.25 / unidad
Ver hoja de datos →ATMEGA2560V-8CUR
✅ Sustitución directa✓ En stock
$6.12 / unidad
Ver hoja de datos →ATMEGA640V-8CUR Valores máximos y características eléctricas
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Program Memory Type | FLASH |
| Program Memory Size | 64 KB (32K x 16) |
| RAM Size | 8 KB |
| EEPROM Size | 4 KB |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Number of I/O | 86 |
| General Purpose Working Registers | 32 |
| Timers/Counters | 6 flexible timer/counters |
| Real-Time Counter | Yes |
| Temperatura de funcionamiento | -40C to +85C (TA) |
| Encapsulado | 100-CBGA (9x9 mm) |
| Tipo de montaje | Surface Mount |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
| Ancho del bus de datos | 8 Bit |
Guía de configuración de pines de ATMEGA640V-8CUR 100-cbga (9x9 mm)
Configuración de pines para ATMEGA640V-8CUR (encapsulado 100-cbga (9x9 mm)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATMEGA640V-8CUR.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATMEGA640V-8CUR es adecuado para 6 aplicacións: Industrial Automation Controllers, Battery-Powered Monitoring Systems, Instrumentation and Test Equipment, Building Management and HVAC Control, Motor Control and Actuation, Legacy Board Redesign and BOM Continuity.
Industrial Automation Controllers
The ATMEGA640V-8CUR fits industrial automation nodes because its 86 general purpose I/O lines and six timer/counters can drive relays, stepper sequences, and encoder inputs without external port expanders, and the AVR single-cycle RISC core provides deterministic 8 MHz timing for control loops. In a PLC expansion module, the MCU typically handles digital I/O scanning and Modbus-style UART communication while a supervisor handles safety. The wide 1.8 V to 5.5 V supply range tolerates noisy industrial rails, and the -40C to +85C temperature rating covers cabinet environments. The trade-off versus a 16 MHz part is halved computation headroom, so reserve the 8 MHz V-grade for designs whose interrupt budget is verified below roughly 50% CPU load.
Recomendado
Battery-Powered Monitoring Systems
The 1.8 V to 5.5 V operating range is the decisive parameter for battery designs: the ATMEGA640V-8CUR runs directly from two NiMH/alkaline cells or a single-cell lithium rail without a boost converter, and AVR power-down sleep modes drop current to microamp levels while the real-time counter keeps timekeeping. A typical sensor logger uses the six timers for periodic sampling, the 4 KB EEPROM for calibration data, and the 8 KB SRAM for ring buffers between radio transmissions. Using the 8 MHz V-grade instead of a 16 MHz standard part reduces dynamic switching current across the whole discharge curve. The engineering trade-off is that at 1.8 V the MCU must remain clocked at or below 8 MHz, so heavy DSP-style processing is not feasible on this grade.
Recomendado
Instrumentation and Test Equipment
Bench instruments benefit from the ATmega640's combination of 64 KB self-programmable Flash for field-updatable firmware, 4 KB EEPROM for calibration constants, and JTAG on-chip debugging for deterministic bring-up. The 86 I/O lines interface front-panel keys, displays, and relay-switched signal paths, while hardware USARTs handle remote control protocols. In a data-acquisition front end, the MCU sequences an external ADC and streams results over UART or SPI; the 8 MHz clock limits sample-rate coordination but is ample for human-interface-class instruments. The CBGA-100 footprint gives a compact 9x9 mm replacement for older TQFP-based boards when re-spinning for area savings, and the V-grade's wide supply range simplifies dual-rail analog designs.
Recomendado
Building Management and HVAC Control
HVAC controllers use the ATMEGA640V-8CUR for fan staging, damper actuation, and temperature network integration, exploiting the 86 I/O lines to drive triacs and read NTC sensor dividers directly. The real-time counter plus a 32.768 kHz crystal supports time-of-use scheduling, and the 4 KB EEPROM holds setpoints and fault logs through power cycles. The -40C to +85C rating covers rooftop unit enclosures, and the 1.8 V minimum supply allows the same PCB to be reused across 3.3 V and 5 V product variants. Communication over TWI or USART links to room units keeps the BOM single-chip. The design consideration is watchdog supervision: the megaAVR watchdog timer must be enabled in field units to recover from EMI-induced lockups in motor-switching environments.
Recomendado
Motor Control and Actuation
With six flexible timer/counters, the ATmega640 generates multiple PWM channels with hardware phase/frequency control suitable for DC motor and stepper actuation, while quadrature encoder inputs are handled in interrupt-driven firmware at 8 MHz. The 86 GPIO lines drive H-bridge enable, direction, and current-sense multiplexing, and the CBGA-100 package places motor interface pins with short return paths to the ground ball array. The wide supply range lets the same controller serve 3.3 V logic and 5 V gate-driver domains. For brushed DC drives under 24 V, the single-chip approach replaces discrete logic and reduces EMI redesign cycles. The key constraint is CPU bandwidth: PWM plus commutation interrupts at 8 MHz must be profiled, and higher-speed motor control should migrate to the ATMEGA640-16CUR drop-in.
Recomendado
Legacy Board Redesign and BOM Continuity
Many legacy products specify the ATmega640 family in TQFP-100 or CBGA-100; the ATMEGA640V-8CUR serves as the low-voltage CBGA continuity part when the original speed grade was 8 MHz. Because the ATmega640/1280/2560 die shares one datasheet and one footprint across memory sizes, a single PCB can be populated with 64 KB, 128 KB, or 256 KB variants to serve multiple SKUs - a common sourcing hedge against allocation. Firmware written for earlier megaAVR parts ports with minimal changes, and the ICSP programming interface (two I/O pins plus reset, per Microchip documentation) is compatible with MPLAB Snap and third-party ISP programmers. Verifying the 9x9 mm CBGA land pattern against the datasheet mechanical drawing is the main re-spin task.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA640V-8CUR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA640-16CUR | ATMEGA640V-8CU | ATMEGA1280-16CUR | ATMEGA2560V-8CUR |
|---|---|---|---|---|---|
| Package | 100-CBGA (9x9 mm) | 100-CBGA (9x9 mm) - same | 100-CBGA (9x9 mm) - same | 100-CBGA (9x9 mm) - same | 100-CBGA (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 128 KB | 256 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Max Clock Speed | 8 MHz | 16 MHz | 8 MHz | 16 MHz | 8 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V | approx 2.7 V to 5.5 V | 1.8 V to 5.5 V | approx 2.7 V to 5.5 V | 1.8 V to 5.5 V |
| General Purpose I/O | 86 | 86 | 86 | 86 | 86 |
Diferenciadores clave
- Lowest supply voltage in the CBGA-100 ATmega640 family (frente a ATMEGA640-16CUR)
- Same-footprint Flash headroom upgrade path (frente a ATMEGA2560V-8CUR)
- Cost-optimized 64 KB entry point (frente a ATMEGA1280-16CUR)
Notas de diseño
Respect the AVR voltage-frequency derating curve: the ATMEGA640V-8CUR is guaranteed to 8 MHz across 1.8 V to 5.5 V, but this is also its ceiling. If the design later needs a crystal above 8 MHz, migrate to the ATMEGA640-16CUR and verify the minimum supply rises to roughly 2.7 V. Add 100 nF decoupling on each VCC/AVCC ball pair plus bulk 10 uF, and keep the analog supply filtered through an LC or ferrite bead when using the ADC.
CBGA-100 (9x9 mm) requires an accurate 1.0 mm-pitch ball land pattern taken directly from the datasheet mechanical drawing; do not scale from a TQFP-100 footprint. Because balls are hidden after reflow, plan AOI or X-ray inspection and use a solder-mask-defined pad per the drawing to control ball collapse. Fill unused area between ball fields with ground plane and stitch vias to reduce ground bounce on the 86 I/O lines during simultaneous switching.
The UR suffix denotes reel packing and the C suffix the CBGA temperature package - do not substitute TQFP variants (e.g., ATMEGA640V-8AU) on the same footprint; they are not pin-compatible. Enable the watchdog timer in production firmware, since the megaAVR has no brown-out-driven latch protection by default unless the BOD fuse is programmed. Fuse settings for clock source and JTAGEN are the most common cause of field programming failures - dump and archive fuses from a known-good board before reflowing replacements.
Información de cumplimiento
Compliance data not present in the provided web data; verify on the Microchip product page for the specific top marking and date code.
