AT91FR4042-CI - ARM7 75MHz MCU 512KB Flash 121-BGA | Microchip
料号： AT91FR4042-CI ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.85 | $168.50 |
| 100 | $14.95 | $1,495.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.5 | $11,500.00 |
AT91FR4042-CI 概述
An ARM7TDMI microcontroller is a 32-bit RISC processor core licensed by Arm Ltd., combining a 32-bit data path with the 16-bit Thumb instruction set to balance performance and code density. Devices in this family are widely used as general-purpose embedded controllers because they pair deterministic interrupt handling with mature tool support (GCC, IAR, Keil). The AT91 sub-line from Microchip/Atmel extends the core with peripheral blocks such as USARTs, timers, and an external bus interface, placing it in the broader category of embedded microcontrollers -> microprocessors -> semiconductors.
Key features of the AT91FR4042-CI include 512 KB (4 Mbits) of reprogrammable program storage, 256 KB (2 Mbits) of SRAM, an external bus interface for off-chip memory or peripherals, two USARTs, a 3-channel timer/counter, a watchdog timer, embedded ICE (in-circuit emulation) debug, and advanced power-saving modes. The combination of large on-chip memory and an external bus removes the need for external SRAM or Flash in many designs, reducing board complexity and BOM cost.
The device is fabricated on a low-power CMOS process and runs from a 1.8 V core supply, with separate I/O domain rails. Its MIPS/Watt figure is competitive for the era and the architecture remains popular for legacy industrial and POS designs that need deterministic real-time performance. The embedded ICE block provides non-intrusive debug and Flash programming without external hardware beyond a standard JTAG probe.
Typical applications include industrial control, point-of-sale terminals, secure access controllers, HMI panels, and other embedded designs that require 32-bit performance with rich on-chip memory. The 121-BGA package makes it suitable for compact, high-density boards.
When designing with the AT91FR4042-CI, ensure the core supply is decoupled with low-ESR ceramic capacitors placed as close as possible to the power balls. The external bus interface requires careful impedance-controlled routing to avoid signal integrity issues at higher bus speeds.
This page synthesizes distributor stock, replacement alternatives, and practical design notes not found in the standalone manufacturer datasheet.
直接替换替代料： AT91FR4042-CI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
AT91FR4081-33CI
✅ 直接替换📋 参考替代料（不在目录中）
AT91FR40162-CI
✅ 直接替换📋 参考替代料（不在目录中）
AT91F40816-33CI
✅ 直接替换📋 参考替代料（不在目录中）
AT91FR4081-33CI-T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AT91FR4042-CI-T
✅ 直接替换📋 参考替代料（不在目录中）
AT91FR4042-CI 最大额定值与电气特性
| Core Architecture | ARM7TDMI 16/32-bit RISC |
| Maximum CPU Clock | 75 MHz |
| Program Flash Memory | 512 KB (256K x 16) |
| SRAM | 256 KB (2 Mbits) |
| 封装 | 121-ball BGA (10x10 mm) |
| Core Supply Voltage | 1.8 V |
| 安装类型 | Surface Mount |
| External Bus Interface | Yes |
| USART Channels | 2 |
| Timer/Counter Channels | 3 |
| Watchdog Timer | Yes |
| Embedded ICE Debug | Yes |
| Power-Saving Features | Advanced power-saving modes |
AT91FR4042-CI 121-ball bga (10x10 mm) 引脚配置指南
AT91FR4042-CI（121-ball bga (10x10 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： AT91FR4042-CI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AT91FR4042-CI 适用于 6 应用s: Industrial Control and PLC Modules, Point-of-Sale Terminals and Payment Devices, Human-Machine Interface (HMI) Panels, Secure Access Controllers and Gateways, Embedded Data Acquisition Systems, Legacy Medical and Lab Instruments.
Industrial Control and PLC Modules
The AT91FR4042-CI fits industrial control applications that require deterministic real-time response from the ARM7TDMI core at 75 MHz, combined with the 512 KB Flash and 256 KB SRAM that remove the need for external program memory in mid-complexity PLC or motion-control firmware. The external bus interface allows expansion to additional peripheral ICs or external SRAM when firmware exceeds on-chip memory. Its two USARTs support RS-232/RS-485 field-bus transceivers for sensor data collection. The 121-BGA package supports compact module form factors typical of DIN-rail-mounted industrial controllers, while the embedded ICE interface enables in-system firmware updates and production JTAG programming without external debug hardware beyond a standard probe.
推荐
Point-of-Sale Terminals and Payment Devices
The AT91FR4042-CI is well suited to point-of-sale terminals that need secure firmware handling, rich connectivity, and a compact 121-BGA footprint for slim terminal enclosures. The 512 KB Flash hosts secure boot, encryption routines, and the terminal application, while the 256 KB SRAM supports transaction processing buffers and display framebuffers. The two USARTs connect to mag-stripe readers, smart-card interfaces, or external modems, and the external bus interface allows direct attachment of TFT LCD controllers for graphical receipts and touch interfaces.
推荐
Human-Machine Interface (HMI) Panels
The AT91FR4042-CI's combination of ARM7TDMI throughput, 256 KB SRAM, and an external bus interface makes it a strong fit for HMI panels that drive small-to-medium TFT LCDs with touch input. The SRAM holds display framebuffers while the EBI connects to external LCD controllers and touch-screen ADCs. The two USARTs and three timer/counter blocks handle keypad scanning, backlight PWM, and communication with remote PLCs. The 121-BGA package enables the compact board outline required behind slim touch panels, and embedded ICE allows field firmware revisions across the product lifetime.
推荐
Secure Access Controllers and Gateways
Building access controllers and small office gateways benefit from the AT91FR4042-CI's 512 KB Flash, which fits encrypted firmware plus Wiegand reader stacks, and the embedded ICE that supports secure debug during development. The external bus interface accommodates additional secure-element chips, and the two USARTs handle Wiegand or OSDP reader links. The 1.8 V core supply draws low quiescent current in power-saving modes, supporting battery-backed installations. The 121-BGA package keeps the controller compact inside enclosure-mounted readers and gateways.
推荐
Embedded Data Acquisition Systems
Data acquisition front-ends in industrial test equipment and process monitoring use the AT91FR4042-CI for its deterministic 32-bit performance and rich timer channels. The three timer/counter blocks can timestamp events, generate PWM for sensor excitation, and trigger ADC sampling sequences. The external bus interface supports parallel ADCs for high-channel-count analog front-ends, while the 256 KB SRAM buffers sample frames before forwarding over the USARTs or external Ethernet. Embedded ICE speeds firmware iteration during prototype characterization.
推荐
Legacy Medical and Lab Instruments
Medical device designers maintaining long-life instruments (patient monitors, infusion controllers, lab analyzers) often keep the AT91FR4042-CI for its proven ARM7 firmware base and reliable long-term availability through franchised distributors. The 512 KB Flash accommodates firmware that has accumulated regulatory-validated code over years of service, and the 256 KB SRAM supports real-time waveform buffers in monitoring instruments. Embedded ICE enables secure firmware updates that preserve regulatory traceability. The 121-BLT F-BGA footprint suits the compact form factors required for bedside or handheld medical devices.
推荐
推荐产品汇总
工程参考数据： AT91FR4042-CI ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AT91FR4081-33CI | AT91FR40162-CI | AT91F40816-33CI | AT91FR4081-33CI-T | AT91FR4042-CI-T |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 121-BGA (10x10 mm) | 121-BGA (10x10 mm) - same | 121-BGA (10x10 mm) - same | 121-BGA (10x10 mm) - same | 121-BGA (10x10 mm) - same | 121-BGA (10x10 mm) - same |
| Core Architecture | ARM7TDMI 16/32-bit | ARM7TDMI 16/32-bit | ARM7TDMI 16/32-bit | ARM7TDMI 16/32-bit | ARM7TDMI 16/32-bit | ARM7TDMI 16/32-bit |
| Maximum CPU Clock | 75 MHz | 75 MHz | 75 MHz | 33 MHz | 75 MHz | 75 MHz |
| Flash Memory | 512 KB | 1024 KB | 2048 KB | 1024 KB | 1024 KB | 512 KB |
| External Bus Interface | Yes | Yes | Yes | Yes | Yes | Yes |
| Packaging Format | Tray | Tray | Tray | Tray | Tape & Reel | Tape & Reel |
关键差异点
- Balanced on-chip memory footprint at the lowest price in the AT91FR404x family （对比 AT91FR4081-33CI)
- Same 121-BGA footprint enables PCB reuse across AT91FR-family scaling （对比 AT91FR40162-CI)
- 75 MHz operation outperforms the 33 MHz AT91F40816 alternative （对比 AT91F40816-33CI)
设计说明
Estimated: With a 121-ball BGA on a 10x10 mm footprint, the ball pitch is roughly 0.8 mm. Use a 4-layer stackup (signal-ground-power-signal) with microvia-in-pad (VIPPO) for inner balls. Each power/ground ball should be paired with at least one via-in-pad to minimize inductance. Fanout the outer row first to break-out vias, and route the inner balls to inner layers.
Estimated: The 1.8 V core supply should be decoupled with at least one 10 uF bulk capacitor and four 100 nF ceramic capacitors placed within 5 mm of the respective power balls. Place a ferrite bead between any external regulator and the MCU supply balls if the regulator sits more than 25 mm away, to attenuate switching noise from the upstream supply.
The external bus interface (EBI) operates at the CPU clock frequency or a fraction of it. When the EBI runs above 50 MHz, route address, data, and control lines on inner layers with controlled impedance (typically 50 ohm to ground) and match trace lengths within 2 cm to avoid setup/hold violations. Add source-series termination on data lines driven by the MCU.
Estimated: Do not connect the JTAG TCK pin to a slow edge-rate signal source, because TCK edges are used by the embedded ICE to latch TMS/TDI/TDO and a noisy TCK will prevent boundary-scan or Flash programming. Always insert a 100 ohm series resistor near TCK, and route TCK and TMS as short traces away from switching power or clock signals.
合规信息
RoHS, REACH, lead-free, and halogen-free status were not stated in the verified web data; consult the manufacturer datasheet before committing to a regulated design. AEC-Q100 does not apply to this commercial/industrial-grade ARM7 MCU.
