MTCH108-I/SS - 8-Channel Capacitive Touch Controller | Microchip
料号： MTCH108-I/SS ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.86 | $1.86 |
| 10 | $1.69 | $16.90 |
| 100 | $1.48 | $148.00 |
| 500 | $1.31 | $655.00 |
| 1,000 | $1.18 | $1,180.00 |
MTCH108-I/SS 概述
What is a capacitive touch controller? A capacitive touch controller is an integrated circuit that detects changes in capacitance caused by finger proximity or touch and converts them into digital signals for the host MCU. Capacitive touch ICs are sub-categories of human-machine interface (HMI) sensor ICs, sitting within signal conditioning and sensor interface semiconductor blocks. Compared to mechanical buttons they deliver hermetic, low-power, wear-free user inputs.
Key features of the MTCH108-I/SS include: 8 independent proximity/touch channels, 8 dedicated digital outputs that mirror touch state, an advanced optimization algorithm that actively suppresses conducted and radiated noise from the touch signal, configurable low-power and smart-scheduling scan modes selectable through the MTPM pin, plus host-side sensitivity trimming through the MTSA pin. The active guarding feature drives a shield signal onto the sensing electrode to suppress water-drop and hover-induced false triggers.
The architecture combines a charge-transfer analog front end with a digital state machine that runs Microchip's mTouch noise-immunity sequence. Each channel is processed independently, allowing simultaneous proximity and direct-touch detection. The device communicates touch state purely through GPIO-level logic, removing the need for an I2C/SPI host transaction on every press and reducing host firmware complexity.
Typical applications include white-goods control panels (induction cooktops, washing machines, refrigerators), door-entry keypads, automotive interior lighting touch pads, IoT product vending, and consumer-electronics front panels. The SSOP-20 footprint supports hand-soldered prototypes as well as high-density SMT production lines.
When designing with the MTCH108-I/SS, lay out the MTPM pin resistor network first to lock down scan interval and current consumption before PCB fabrication. Bypass VDD with a 100 nF ceramic close to the IC, and route sensor traces with a ground fill at least 0.5 mm away to minimize parasitic capacitance.
This page synthesizes verified distributor pricing, drop-in SSOP-20 alternatives from the same MTCH family, and practical design notes that go beyond what the Microchip datasheet alone provides for engineers selecting an 8-channel capacitive touch controller.
直接替换替代料： MTCH108-I/SS ——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： MTCH108-I/SS （相同外形与封装尺寸） ——差异在于 Noise Suppression, Package, Number of Digital Outputs, Operating Temperature Range, Sensitivity Configuration.
快速对比工具——选择替代料号进行并排对比：
MTCH108-I/SSG
✅ 直接替换📋 参考替代料（不在目录中）
MTCH108-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
MTCH108T-I/SS
✅ 直接替换📋 参考替代料（不在目录中）
MTCH108/SS
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.96 / 个
查看数据手册 →MTCH108-I/GZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.41 / 个
查看数据手册 →MTCH108-I/SS 最大额定值与电气特性
| Touch Channels | 8 |
| Digital Outputs | 8 (one per channel) |
| Operating Voltage (VDD) | 2.05 V to 3.6 V |
| Scan Modes | Continuous, Low-Power (256 ms), Smart-Scheduling (32/64 ms) |
| Configuration Pins | MTSA (sensitivity), MTPM (power mode) |
| Noise Suppression | Active optimization algorithm + active guarding |
| Output Interface | CMOS digital GPIO (logic-level) |
| 工作温度 | -40 C to +85 C (industrial) |
| 封装 | 20-pin SSOP (5.30 mm body width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| Family | mTouch MTCH102 / MTCH105 / MTCH108 |
| Technology | Charge-transfer capacitive sensing |
MTCH108-I/SS 引脚配置
| 引脚 1 | VDD — Power supply input, 2.05 V to 3.6 V |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | MTSA — Multi-Time-Sensitivity Adjustment input; external resistor sets touch sensitivity |
| 引脚 4 | MTPM — Power Mode select; low=continuous, mid=256 ms low-power, high=32/64 ms smart-scheduling |
| 引脚 5 | O1 — Channel 1 digital output (CMOS, active high) |
| 引脚 6 | C1 — Channel 1 capacitive sensor input |
| 引脚 7 | O2 — Channel 2 digital output |
| 引脚 8 | C2 — Channel 2 capacitive sensor input |
| 引脚 9 | O3 — Channel 3 digital output |
| 引脚 10 | C3 — Channel 3 capacitive sensor input |
| 引脚 11 | O4 — Channel 4 digital output |
| 引脚 12 | C4 — Channel 4 capacitive sensor input |
| 引脚 13 | O5 — Channel 5 digital output |
| 引脚 14 | C5 — Channel 5 capacitive sensor input |
| 引脚 15 | O6 — Channel 6 digital output |
| 引脚 16 | C6 — Channel 6 capacitive sensor input |
| 引脚 17 | O7 — Channel 7 digital output |
| 引脚 18 | C7 — Channel 7 capacitive sensor input |
| 引脚 19 | O8 — Channel 8 digital output |
| 引脚 20 | C8 — Channel 8 capacitive sensor input |
典型应用
MTCH108-I/SS 适用于 7 应用s: White-Goods Control Panels, Door-Entry Keypads and Access Control, Automotive Interior Lighting Touch Pads, IoT Smart-Home Touch Panels, Industrial Operator Panels and HMIs, Consumer Electronics Front Panels, Medical Touch User Interfaces.
White-Goods Control Panels
The MTCH108-I/SS fits white-goods control panels because its 8 independent capacitive touch channels and 8 CMOS digital outputs directly mirror the multi-button layouts typical of induction cooktops, washing machines, and refrigerator user interfaces. Each channel drives a logic-level output, so the host MCU reads button presses through GPIO polling without any I2C or SPI register traffic. The advanced noise-optimization algorithm and active guarding suppress 50 Hz / 60 Hz line interference and water-film false triggers common on kitchen and laundry surfaces. Designers can configure low-power 256 ms scan mode via MTPM to meet appliance standby regulations, and MTSA lets the factory calibrate sensitivity to glass, acrylic, or stainless overlays up to 5 mm thick without firmware changes.
推荐
Door-Entry Keypads and Access Control
The MTCH108-I/SS suits door-entry and access-control keypads because its 8 channels directly drive an 8-button numeric or function keypad while running on a 2.05 V to 3.6 V supply compatible with 3 V lithium battery packs. Each touch channel mirrors to a CMOS digital output, so the access controller can poll inputs without waking the main MCU I2C stack. The active-guarding feature suppresses water and condensation false triggers on outdoor-mounted keypads. The 256 ms low-power scan mode via MTPM pin lets battery-powered locks idle at microamp current while still waking on touch. Industrial -40 C to +85 C temperature grade ensures operation in unheated vestibules and metal gate boxes across continental climates.
推荐
Automotive Interior Lighting Touch Pads
The MTCH108-I/SS fits automotive interior lighting touch pads because each of its 8 channels can replace a mechanical rocker or pushbutton for reading light, dome light, and ambient lighting controls. The industrial -40 C to +85 C temperature grade handles cabin temperatures from cold-start to summer sun-load, and the 3.3 V supply rail is compatible with post-regulator automotive power trees. The advanced noise-optimization algorithm suppresses EMI from the vehicle's CAN bus, LED driver switching, and motor control inverters that would otherwise couple into capacitive traces. Direct GPIO outputs eliminate I2C interrupt latency, providing instantaneous lighting response. The SSOP-20 package supports the high-density PCB layouts typical of overhead console and door-trim modules.
推荐
IoT Smart-Home Touch Panels
The MTCH108-I/SS is well suited to IoT smart-home touch panels where 8 GPIO-style outputs let a low-cost Wi-Fi or BLE host MCU poll buttons without any I2C transaction overhead. The 2.05 V to 3.6 V supply range operates directly from a single Li-ion cell or 3.3 V regulated rail, simplifying power tree design in compact wall-mount form factors. Active guarding and the noise-optimization algorithm reject false triggers from 2.4 GHz Wi-Fi and BLE transmissions radiated into the touch sensor area. Low-power 256 ms scan mode set by the MTPM pin enables months of battery life on a thermostat or wall-switch running on two AAA cells. Designers can scale up to 16 channels by cascading two MTCH108 devices on separate GPIO banks.
推荐
Industrial Operator Panels and HMIs
The MTCH108-I/SS is ideal for industrial operator panels and HMIs because its industrial -40 C to +85 C rating tolerates factory floor temperature swings while the 8 channels drive the start, stop, mode, jog, fault-reset, and override buttons typical of machine control pendants. Active guarding suppresses electromagnetic interference from variable-frequency drives and motor contactors that couple through long cable harnesses in industrial cabinets. CMOS digital outputs interface directly to industrial MCU GPIO at 3.3 V logic, eliminating level shifters on the touch-input path. The MTPM low-power mode lets the panel enter energy-saving sleep between operator interactions while waking instantly on touch, supporting energy-aware Industry 4.0 dashboards. The SSOP-20 footprint survives hand-soldered prototype rework and high-volume SMT assembly.
推荐
Consumer Electronics Front Panels
The MTCH108-I/SS supports consumer electronics front panels from audio amplifiers to smart speakers because its 8 channels replace 8 mechanical buttons (volume up/down, source, mute, power, presets, EQ, play) while the GPIO-style outputs read directly into a low-cost host MCU. The 2.05 V to 3.6 V supply supports USB-powered and battery-powered consumer devices, including those powered by a single 18650 Li-ion cell. Active guarding prevents water splashes and oily fingerprints on kitchen-counter audio gear from causing false triggers. The smart-scheduling 32 / 64 ms scan mode set via MTPM balances touch responsiveness against battery drain during music playback. The SSOP-20 package fits within sub-50 mm front-panel PCBs where every square millimeter matters.
推荐
Medical Touch User Interfaces
The MTCH108-I/SS is suitable for non-critical medical touch interfaces such as hospital-bed control pendants, infusion-pump secondary keypads, and diagnostic-equipment front panels. The industrial -40 C to +85 C rating supports continuous operation in climate-controlled clinical environments. The active guarding feature prevents fluids and disinfectants (isopropyl alcohol, hydrogen peroxide wipes) from creating false triggers on sealed overlays, which is essential for infection-control protocols. The GPIO-style outputs allow direct MCU polling without I2C latency, providing instant tactile feedback when clinicians adjust settings. The RoHS and REACH compliance simplifies regulatory submissions for IEC 60601-1 medical electrical equipment designs.
推荐
推荐产品汇总
工程参考数据： MTCH108-I/SS ——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 | MTCH108-I/SSG | MTCH108-I/SN | MTCH108T-I/SS | MTCH108/SS | MTCH108-I/GZ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP (same) | 20-SOIC (different body width) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) |
| Touch Channels | 8 | 8 | 8 | 8 | 8 | 8 |
| Digital Outputs | 8 (GPIO-style) | 8 (GPIO-style) | 8 (GPIO-style) | 8 (GPIO-style) | 8 (GPIO-style) | 8 (GPIO-style) |
| Operating Voltage | 2.05 V to 3.6 V | 2.05 V to 3.6 V | 2.05 V to 3.6 V | 2.05 V to 3.6 V | 2.05 V to 3.6 V | 2.05 V to 3.6 V |
| Temperature Grade | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Commercial 0 C to +70 C | Industrial -40 C to +85 C |
| MTSA / MTPM Pins | Yes | Yes | Yes | Yes | Yes | Yes |
| Active Guarding | Yes | Yes | Yes | Yes | Yes | Yes |
关键差异点
- GPIO-style digital outputs eliminate I2C/SPI register overhead （对比 Microchip CAP1208 (8-channel I2C touch controller))
- Active guarding plus advanced noise-optimization algorithm in a charge-transfer architecture （对比 Generic 8-channel capacitive touch controllers from other vendors)
- Configurable power modes via single MTPM pin without firmware （对比 Firmware-only power-mode controllers)
- Wide 2.05 V to 3.6 V supply range supports battery and regulated rails （对比 5 V-only capacitive touch controllers)
设计说明
Lay out the MTSA resistor network first to fix touch sensitivity before PCB fabrication. Place the MTPM mode-select resistor close to pin 4 to avoid stray capacitance picking up switching noise from adjacent traces. Route each Cx sensor trace with a ground fill at least 0.5 mm away and keep trace length under 100 mm to minimize parasitic loading. Add a 100 nF ceramic bypass capacitor within 3 mm of the VDD pin, and provide a solid ground pour under the IC to reference the active guarding shield. For multilayer boards, dedicate an inner layer as a ground reference plane for the entire touch sensor area.
Do not exceed VDD = 3.6 V; the MTCH108-I/SS does not include 5 V tolerance on sensor inputs and will permanently damage the analog front end if over-driven. Avoid placing the IC directly under noisy switch-mode power inductors, since capacitive traces can couple switching ripple into the touch signal even with active guarding. When running at the 256 ms low-power scan mode, ensure the host MCU wake time is shorter than the scan period to avoid missed touches. Do not connect sensor traces to the host MCU debug header, since the 10-20 pF probe loading can shift calibration outside the MTSA tuning range.
Estimated: at VDD = 3.3 V and continuous scan mode, the MTCH108-I/SS draws approximately 50 uA per active channel during conversion, so 8-channel continuous scanning pulls roughly 400 uA. In 256 ms low-power scan mode the average supply current drops to under 10 uA, suitable for coin-cell battery applications over multi-year lifetimes. For battery-life calculation, use the formula: I_avg = (I_active * t_scan) / t_period + I_idle, where I_active is the per-channel active current, t_scan is the conversion duration (typically 1-2 ms per channel), t_period is the scan interval, and I_idle is the sleep current (typically 1-2 uA). Confirm the actual active current with the Microchip MTCH108 datasheet before committing to a battery-life budget.
Implement a guard ring or hatched ground fill around each sensor pad to define the touch electric-field boundary and reduce side-triggering. Use 0.2 mm minimum trace spacing and avoid 90-degree bends; use 45-degree or curved traces for sensor routing. When overlaying the touch sensor with a 2-5 mm glass or acrylic panel, calibrate the MTSA resistor empirically on the production overlay material; sensitivity scales inversely with overlay thickness. For water-resistance, route the guard trace as a separate driven shield electrode 1-2 mm surrounding each sensor pad and connect to the MTCH108 active-guarding output. Avoid placing LEDs, motors, or transformer cores within 10 mm of any sensor trace.
合规信息
RoHS and lead-free compliance confirmed by DigiKey, LCSC, and JLCPCB distributor listings. Halogen-free per Microchip environmental compliance documentation. Not AEC-Q100 qualified; for AEC-Q100 automotive applications use Microchip's dedicated automotive-grade touch controllers. REACH and conflict-minerals compliance per Microchip quality page.
