PIC18F8490-E/PT - 8-bit LCD MCU, 16KB Flash, 80-TQFP | Microchip
料号： PIC18F8490-E/PT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.12 | $11.12 |
| 10 | $9.95 | $99.50 |
| 100 | $8.62 | $862.00 |
| 500 | $7.4 | $3,700.00 |
| 1,000 | $6.55 | $6,550.00 |
PIC18F8490-E/PT 概述
Background knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), working memory (RAM), and peripheral interfaces. The PIC18 family uses an enhanced RISC architecture with 16-bit instructions and 8-bit data path, delivering up to 16 MIPS (10 MIPS for E-spec extended-temperature parts) at 40 MHz. The 'LCD' suffix denotes an on-chip LCD segment driver, eliminating the need for an external driver IC in products with glass displays such as meters and thermostats.
Key features include a wide operating voltage range of 2.0 V to 5.5 V (typical 4.5 V application supply), nanoWatt power management with multiple idle/sleep modes, an internal oscillator block, an LCD driver capable of driving a multiplexed segment display, and up to 66 general-purpose I/O. The 'E' suffix denotes the Extended temperature grade (-40C to +125C), while the '-/PT' suffix denotes the 80-pin TQFP industrial package.
Technically, the PIC18F8490 uses a 16-bit modified Harvard bus architecture with separate program and data paths, an 8-level hardware stack, and an enhanced instruction set that adds direct, indirect, and relative addressing modes. The integrated LCD controller supports static, 1/2, 1/3, and 1/4 multiplexed displays and can be tied to one of multiple clock sources for bias generation.
Typical applications include handheld meters, thermostats, home security panels, power/gas/water metering, medical instruments, and any portable product combining a segment LCD with low-power 8-bit control. The PIC18F8490-E is especially suited to industrial environments thanks to its extended temperature grade.
When designing with this part, allocate sufficient PCB area for the 12 x 12 mm TQFP footprint and ensure your in-circuit programmer (ICD 2/3, PICkit 3/4, or MPLAB Snap) can access the ICSP pins. Use Microchip's MPLAB X IDE and XC8 compiler for firmware development.
This page synthesizes distributor pricing, pin-compatible alternatives, and practical design considerations beyond the manufacturer datasheet to help engineers select, source, and integrate the PIC18F8490-E/PT quickly.
直接替换替代料： PIC18F8490-E/PT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC18F8490-E/PT （相同外形与封装尺寸） ——差异在于 Package, ADC, Operating Temperature, Core Architecture, Timers.
快速对比工具——选择替代料号进行并排对比：
PIC18F8490-I/PT
✅ 直接替换✓ 有现货
$5.55 / 个
查看数据手册 →PIC18F8490T-I/PT
✅ 直接替换✓ 有现货
$6.05 / 个
查看数据手册 →PIC18LF8490-I/PT
✅ 直接替换✓ 有现货
$5.18 / 个
查看数据手册 →PIC18F8410-I/PT
✅ 直接替换✓ 有现货
$6.85 / 个
查看数据手册 →PIC18F8410-E/PT
✅ 直接替换✓ 有现货
$2.15 / 个
查看数据手册 →PIC18F8490-E/PT 最大额定值与电气特性
| Core Architecture | PIC 8-bit RISC (PIC18 enhanced) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM Size | 768 bytes |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage | 2.0 V to 5.5 V (typical 4.5 V application) |
| I/O Pins | 66 |
| 封装 / 外壳 | 80-TQFP (12x12 mm) |
| 安装类型 | Surface Mount |
| Temperature Grade (E suffix) | -40 C to +125 C (Extended) |
| Integrated LCD Driver | Yes (segment LCD, static to 1/4 mux) |
| nanoWatt Power Management | Yes (multiple idle/sleep modes) |
| Internal Oscillator | Yes |
| Packaging | Tray |
| RoHS 状态 | Compliant |
PIC18F8490-E/PT 80-tqfp (12x12 mm) 引脚配置指南
PIC18F8490-E/PT（80-tqfp (12x12 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： PIC18F8490-E/PT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PIC18F8490-E/PT 适用于 6 应用s: Handheld Digital Meters, Programmable Thermostats, Home Security Control Panels, Power, Gas, and Water Metering, Medical Monitoring Devices (Non-Critical), Industrial Control HMIs.
Handheld Digital Meters
The PIC18F8490-E/PT is purpose-built for handheld digital meters, integrating a segment LCD controller, nanoWatt power management, and 16 KB Flash in an 80-TQFP. Its Extended -40 C to +125 C temperature rating and 2.0-5.5 V operating range support battery-powered multimeters and clamp meters in outdoor or industrial settings. The integrated LCD driver eliminates an external driver IC, reducing BOM cost and PCB area, while 66 I/O pins allow multi-function rotary switches, mode buttons, and analog front-end sampling. The MCU's 40 MHz / 10 MIPS throughput easily handles RMS calculation, auto-ranging, and display refresh without taxing the CPU. Compared with discrete MCU+LCD-driver solutions, this single-chip approach simplifies layout and lowers quiescent current through nanoWatt sleep modes for multi-year battery life.
推荐
Programmable Thermostats
For programmable thermostats, the PIC18F8490-E/PT delivers an integrated segment LCD interface, ample Flash for schedule/UI logic, and nanoWatt sleep modes that keep idle current at microamp levels. The 66 I/O pins map cleanly to temperature sensor inputs (NTC or digital), relay drivers for HVAC control, keypad scan lines, and the segment LCD. Its 2.0-5.5 V operating range supports both 3.3 V and 5 V sensor rails, while Extended temperature grade ensures reliable operation in wall-mounted enclosures near heat sources. Engineers value the rich peripheral set including timers for PWM-based relay control and the on-chip LCD controller that drives 7-segment and icon LCDs without an external charge pump IC, keeping total BOM under tight cost targets.
推荐
Home Security Control Panels
The PIC18F8490-E/PT fits home security control panels by combining segment LCD display, multiple I/O for zone wiring, and ample Flash for state-machine and communication logic. Its on-chip LCD driver displays system status, fault codes, and menu navigation on a glass segment display typical of mid-tier alarm panels. The 66 I/O pins accept wired zone loops, keypads, sirens, and PSTN/dialer interfaces, while the 40 MHz CPU handles sensor debouncing, code matching, and event logging. NanoWatt modes reduce quiescent draw during armed standby so the panel can run from a backup battery for many hours after AC loss. Extended temperature operation ensures reliability in basement and attic installations.
推荐
Power, Gas, and Water Metering
Utility metering products rely on the PIC18F8490-E/PT for its integrated LCD, low power, and extended temperature performance. The MCU reads pulse outputs from flow sensors or energy-measurement ICs, accumulates usage, and drives the segment LCD showing kWh, m3, or gallons. The 16 KB Flash stores tariff tables, calibration constants, and tamper logs; 768 bytes RAM is sufficient for hourly/daily rollups. NanoWatt sleep modes between sensor pulses extend battery life to 10+ years in gas and water meters where replacement is impractical. The Extended -40 C to +125 C rating handles outdoor meter enclosures exposed to direct sunlight and freezing winters. Compared with higher-end Cortex-M solutions, the PIC18F8490-E/PT offers lower cost and simpler toolchain for cost-sensitive metering deployments.
推荐
Medical Monitoring Devices (Non-Critical)
For non-critical medical monitoring devices such as digital thermometers, body-weight scales with BMI calculation, and blood-pressure cuffs, the PIC18F8490-E/PT delivers the segment LCD interface, extended temperature tolerance for clinical environments, and reliable 8-bit processing in a familiar Microchip toolchain. The integrated LCD displays systolic/diastolic readings, pulse rate, or temperature in a high-contrast format readable in low-light conditions. Its low-power operation supports battery-powered devices that may sit on a shelf for months between uses, and the 16 KB Flash accommodates calibration curves and unit-of-measure conversions. Designers value the predictability and longevity of the PIC18 platform for medical-grade reliability.
推荐
Industrial Control HMIs
Industrial control HMIs with segment LCD keypads benefit from the PIC18F8490-E/PT's Extended temperature grade, large I/O count, and integrated LCD driver. The 66 I/O lines handle keypad scanning (up to 8x8 matrix), LED indicators, discrete outputs, and serial links to a host PLC or inverter. The 16 KB Flash holds menu structures, parameter sets, and PID tuning data; 768 bytes RAM supports runtime buffering. Operating from -40 C to +125 C means the HMI module can be co-located with motor drives and power electronics without thermal margin concerns. The MCU's robust PIC18 instruction set and mature MPLAB X IDE / XC8 compiler ecosystem shorten development cycles for industrial OEMs.
推荐
推荐产品汇总
工程参考数据： PIC18F8490-E/PT ——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 | PIC18F8490-I/PT | PIC18F8490T-I/PT | PIC18LF8490-I/PT | PIC18F8410-I/PT | PIC18F8410-E/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP (12x12 mm) | 80-TQFP - same | 80-TQFP - same | 80-TQFP - same | 80-TQFP - same | 80-TQFP - same |
| Maximum CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 66 | 66 | 66 | 66 | 66 | 66 |
| Temperature Grade | Extended (-40C to +125C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended (-40C to +125C) |
| Integrated LCD Driver | Yes (segment LCD) | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Extended temperature grade in same LCD-driver family （对比 PIC18F8490-I/PT)
- Integrated segment LCD controller （对比 PIC18F8410-I/PT)
- Low-power nanoWatt technology （对比 PIC18LF8490-I/PT)
设计说明
The PIC18F8490-E/PT is specified for -40C to +125C junction temperature (Extended grade). At 40 MHz with all peripherals active, typical core current is on the order of 10-15 mA at 5 V. Estimated: at 40 MHz, 5 V, IO load 20 mA, total power ~100 mW gives a junction rise well within the 80-TQFP thermal resistance (~50 C/W on a 4-layer JEDEC PCB). Ensure your enclosure does not trap heat near the IC.
The 80-TQFP (12x12 mm) has 0.5 mm pitch leads. Use a PCB land pattern that meets IPC-7351 nominal dimensions with a 0.30 mm land width and 0.40 mm pitch extension. Add a 5x5 grid of 0.3 mm thermal vias under the center pad if used (this package variant does not have an exposed pad, but good ground pour helps EMI). Keep ICSP pins (PGC/PGD) accessible for in-circuit programming and debugging.
Decouple VDD with a 100 nF ceramic capacitor placed within 3 mm of each VDD pin, plus a bulk 10 uF tantalum or aluminum polymer at the package supply entry. Use the nanoWatt sleep modes (Sleep, Idle, and the peripheral-specific low-power states) to drop quiescent current to single-digit microamps. Tie unused I/O to defined logic levels (do not leave them floating) to minimize shoot-through current.
Avoid selecting the wrong temperature grade: 'E' is Extended (-40 to +125C) while 'I' is Industrial (-40 to +85C). Mixing them in outdoor metering or industrial HMIs causes field failures. Verify the device marking matches the datasheet ordering code before placing parts on the PCB. Also confirm the LCD bias voltage and segment count are within the on-chip driver's capability for your chosen glass.
合规信息
RoHS compliant per Microchip product page. Not AEC-Q100 qualified (industrial Extended grade only). Refer to PIC18F8490 datasheet for full compliance documentation.
