STLED316SMTR - 6-Digit LED Controller w/ Key Scan, SO-24 | STMicroelectronics
MPN: STLED316SMTR ✓ Hoạt độngSTLED316SMTR Tóm tắt
What is an LED display controller? An LED display controller (sometimes called an LED driver or display bias IC) is an interface device that sits between a microcontroller and a multiplexed 7-segment or dot-matrix LED panel. It receives display data over a low-pin-count serial bus (SPI, I2C, or proprietary) and re-drives each segment at the correct duty cycle, freeing the host MCU from software multiplexing. In the broader taxonomy, LED display controllers sit beneath LED Drivers -> Power Management -> Power & Interface ICs, and they are distinct from simple LED current sinks because they integrate the timing, brightness, and key-scan logic required for human-machine interface (HMI) panels.
Key features of the STLED316SMTR include 14 open-drain segment/digit outputs rated at 40 mA continuous, integrated 3-wire serial interface (clock, data, strobe) compatible with SPI mode 0, hardware key-scan with on-chip debounce, low standby current to support battery-backed panels, and a wide industrial operating temperature range. The device is also designed for minimum external BOM - only the segment current-setting resistor and decoupling caps are required, allowing very compact front-panel PCBs.
Typical applications include white-good front panels (washing machines, microwaves, ovens), industrial control HMIs, point-of-sale (POS) terminals, audio equipment displays, instrument cluster readouts, and any 6-digit or smaller 7-segment user interface requiring keypad scanning. With 8 segment + 6 digit outputs the controller can drive a 6-digit 7-segment display plus decimal points, or up to 8 separate status LEDs.
When designing with the STLED316SMTR, observe the absolute maximum segment current rating and choose the external RSET resistor accordingly. Ensure the 3-wire interface timing matches SPI mode 0 (CPOL=0, CPHA=0) of the host MCU, and place the decoupling capacitor as close as possible to VDD to suppress key-scan glitches during display multiplexing.
This page synthesises distributor pricing, parametric comparison with same-brand and cross-brand drop-in alternatives, and practical design notes that complement - but do not replace - the official STMicroelectronics datasheet.
Bộ thay thế dễ dàng lắp đặt cho STLED316SMTR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
STLED316S
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STLED316M
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TM1637
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TM1638
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STLED316SMTR Tỷ lệ tối đa & tính chất điện
| Product Type | Serial-interfaced 6-digit LED controller with key scan |
| Number of Segments | 8 (plus 6 digit drivers, 14 outputs total) |
| Number of Digits Supported | Up to 6 digits |
| Maximum Segment Output Current | 40 mA per segment |
| Cấu hình đầu ra | Open-drain segment/digit drivers |
| Key-Scan Matrix | 2 x 2 (supports up to 4 keys) |
| Serial Interface | 3-wire SPI-compatible (clock, data, strobe) |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| LED Forward Voltage Range | up to 3 V (LED front-panel drive) |
| Standby Current | Low (microamp-level standby mode) |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Hộp | 24-pin SO (SO-24, 7.5 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (MTR suffix) |
| RoHS Compliance | Compliant (Pb-free) |
Cấu hình chân STLED316SMTR
| Chân 1 | STB — Strobe / chip-select (active high) for 3-wire serial interface |
| Chân 2 | CLK — Serial clock input |
| Chân 3 | DIN — Serial data input |
| Chân 4 | GND — Ground |
| Chân 5 | SEG0 — Segment A driver output (open-drain) |
| Chân 6 | SEG1 — Segment B driver output (open-drain) |
| Chân 7 | SEG2 — Segment C driver output (open-drain) |
| Chân 8 | SEG3 — Segment D driver output (open-drain) |
| Chân 9 | SEG4 — Segment E driver output (open-drain) |
| Chân 10 | SEG5 — Segment F driver output (open-drain) |
| Chân 11 | SEG6 — Segment G driver output (open-drain) |
| Chân 12 | SEG7 — Decimal-point driver output (open-drain) |
| Chân 13 | DIG0 — Digit 0 common driver (open-drain) |
| Chân 14 | DIG1 — Digit 1 common driver (open-drain) |
| Chân 15 | DIG2 — Digit 2 common driver (open-drain) |
| Chân 16 | DIG3 — Digit 3 common driver (open-drain) |
| Chân 17 | DIG4 — Digit 4 common driver (open-drain) |
| Chân 18 | DIG5 — Digit 5 common driver (open-drain) |
| Chân 19 | KS0 — Key-scan row 0 |
| Chân 20 | KS1 — Key-scan row 1 |
| Chân 21 | KI0 — Key-scan input 0 |
| Chân 22 | KI1 — Key-scan input 1 |
| Chân 23 | VDD — Positive supply (4.5 V to 5.5 V) |
| Chân 24 | TEST — Test pin (leave open or connect to GND in production) |
Ứng dụng tiêu biểu
STLED316SMTR phù hợp cho 6 Áp dụngs: White-Good Front Panels (Washing Machines, Microwaves, Ovens), Industrial Control HMIs and Process Indicators, Point-of-Sale (POS) Terminals, Audio Equipment Displays (Amps, Receivers, Mixers), Instrument Cluster Readouts (Bench Multimeters, Lab PSUs), Status / Counter Panels (Production Line Counters, Timers).
White-Good Front Panels (Washing Machines, Microwaves, Ovens)
The STLED316SMTR is purpose-built for white-good front-panel HMIs where a 6-digit 7-segment display shows time, temperature, or programme status. With 8 segment + 6 digit open-drain outputs at 40 mA per segment, it can directly drive standard red/green 7-segment LEDs without external drivers, while the integrated 2x2 key-scan handles Start/Pause/Reset/Option buttons. The 4.5-5.5 V supply matches the appliance 5 V rail, and the SO-24 package fits behind compact display windows. Compared to a discrete multiplexed solution, this part reduces BOM by ~10 components and frees MCU GPIOs.
Được đề xuất
Industrial Control HMIs and Process Indicators
Industrial control panels often need to show 6-digit process values (flow rate, RPM, temperature) plus 4 function keys. The STLED316SMTR's industrial -40 C to +85 C operating range, 5 V supply tolerance, and built-in ESD protection on segment outputs suit 24 V cabinet environments when paired with appropriate isolation. The 3-wire SPI interface reduces wiring back to the main controller, and the low standby current supports battery-backed panel memory retention. Galvanic isolation on SPI is recommended when the panel sits >1 m from the controller.
Được đề xuất
Point-of-Sale (POS) Terminals
POS terminals require a 6-digit price/total display plus 4 cashier keys (Clear, Subtotal, Cash, Enter). The STLED316SMTR directly drives the 7-segment price display and scans the 4 keypad buttons, removing the need for a dedicated keypad controller IC. Its SO-24 package is small enough for compact handheld POS housings, and the low standby current (~1 uA) extends battery life during card-payment wait states. Anti-tamper key matrices can be implemented by combining STLED316SMTR key-scan with the host MCU interrupt logic.
Được đề xuất
Audio Equipment Displays (Amps, Receivers, Mixers)
Hi-Fi amplifiers and AV receivers traditionally use 6-digit volume/frequency readouts. The STLED316SMTR's clean 40 mA per-segment drive produces even brightness across the display without the LED-matching issues seen with discrete matrix designs. The 3-wire SPI bus shares the same pins as other front-panel ICs, simplifying the MCU pin budget. The -40 to +85 C range ensures stable operation inside warm amplifier chassis. Optional external PWM brightness control can be added via a digital potentiometer on VDD.
Được đề xuất
Instrument Cluster Readouts (Bench Multimeters, Lab PSUs)
Bench instruments such as programmable lab power supplies show precise 6-digit voltage/current readouts and frequently include 4 front-panel keys. The STLED316SMTR drives the 6-digit display and scans the keys in a single IC, freeing the main measurement DSP/MCU to focus on ADC acquisition and control loops. Its 5 V supply is compatible with most bench-instrument rails, and the 24-pin SO package fits even the most compact 1/4-rack housings. Pair with a 24-bit ADC for full 6.5-digit bench-DMM accuracy.
Được đề xuất
Status / Counter Panels (Production Line Counters, Timers)
Production-line counters and event timers often need a 6-digit count plus 4 function keys (Reset, Start, Stop, Mode). The STLED316SMTR combines the display driver and keypad interface in one SO-24 chip, dramatically simplifying the panel BOM. Its low standby current is ideal for battery-backed counters that retain count during mains interruptions. Multiple STLED316SMTRs can be cascaded on the same 3-wire SPI bus by using independent STB (strobe) lines to address each panel separately.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho STLED316SMTR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | STLED316S | STLED316M | TM1637 | TM1638 |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Titan Micro Electronics | Titan Micro Electronics |
| Package | SO-24 | SO-24 | SO-24 | SO-24 | SO-28 |
| Number of Digits | 6 | 6 | 6 | 6 | 10 |
| Number of Segments | 8 (7-seg + DP) | 8 | 8 | 8 | 10 |
| Segment Output Current | 40 mA | 40 mA | 35 mA | 40 mA | 40 mA |
| Serial Interface | 3-wire SPI | 3-wire SPI | 3-wire SPI | 2-wire proprietary | 2-wire proprietary |
| Key-Scan Matrix | 2 x 2 (4 keys) | 2 x 2 | 2 x 2 | 2 x 1 (2 keys) | 3 x 8 (24 keys) |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.3 V to 5.5 V | 3.3 V to 5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- True 4-key scanning with hardware debounce (vsTM1637)
- Industry-standard 3-wire SPI-compatible interface (vsTM1637)
- STMicroelectronics industrial-grade -40 to +85 C qualification (vsTM1638)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 23) and a 10 uF bulk capacitor within 5 mm. Keep the 3-wire SPI traces (CLK, DIN, STB) short and routed away from the segment/digit outputs to avoid capacitive coupling that may inject display noise into the serial data. The TEST pin (pin 24) should be tied to GND or left open in production - never drive it high.
Estimated: at full 6-digit multiplex with all segments ON and 40 mA per segment, the worst-case instantaneous supply current can reach 8 x 40 mA x 6 / 6 (duty) = 320 mA peak. Select a 5 V regulator rated for at least 500 mA to avoid dropout during digit transitions. The average current is much lower (~50-80 mA) due to multiplexing duty cycle, but the peak demand dictates regulator sizing.
Do not exceed the 40 mA per-segment absolute maximum - sustained overcurrent will degrade the open-drain output FETs. Always use a current-setting resistor (RSET) if LED forward voltage is below 3 V to limit inrush. For common-anode displays, ensure the digit commons are switched appropriately; STLED316SMTR drives commons as open-drain so they must be pulled up externally for common-anode topology.
The 3-wire SPI interface is SPI-mode-0 compatible (CPOL=0, CPHA=0). Maximum clock rate per the datasheet is typically 1 MHz - exceeding this can corrupt display data. For long PCB traces (>50 mm) add a 33 ohm series resistor on CLK to dampen reflections. When cascading multiple STLED316SMTRs, give each device a unique STB line; CLK and DIN can be shared.
Thông tin tuân thủ
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified - this is an industrial/consumer-grade part. Halogen-free per ST green-compliance statement.
