LTF-2502KR LED Display Datasheet - 0.26-inch Digit Height - AlInGaP Super Red - 2.6V Forward Voltage - Takardar Fasaha ta Hausa

1. Bayyani Game da Samfur

LTF-2502KR na'urar nuni ce mai lambobi biyar da sassa bakwai don nuna lambobi da haruffa. Babban aikinta shine samar da bayanin lambobi mai haske da tsabta don kayan aikin lantarki. Fasahar cibiyar ta amfani da guntu LED na AlInGaP (Aluminum Indium Gallium Phosphide) da aka girma akan GaAs substrate, wanda aka sani da samar da hasken ja mai inganci. Na'urar tana da fuskar baƙi tare da alamomin sassa fari, wanda ke haifar da bayyanar da ya bambanta wanda ya dace da yanayi daban-daban na haske. An tsara shi azaman nuni mai haɗaɗɗiyar anode (multiplex common anode), ma'ana an haɗa anodes na kowane lamba a ciki, yana buƙatar tsarin tuƙi mai rarraba lokaci (time-division multiplexing) don haskaka kowane lamba a jere.

1.1 Siffofi da Fa'idodi Masu Muhimmanci

• Girman Lamba Mai Ƙarami:Yana da tsayin lamba 0.26-inch (6.8 mm), yana ba da ma'auni tsakanin karantawa da ingantaccen amfani da sarari.
• Ingancin Gani:Yana ba da sassa masu ci gaba daidai, kyakkyawan bayyanar haruffa, haske mai ƙarfi, bambanci mai girma, da kallon faɗi.
• Ingantaccen Amfani da Wutar Lantarki:An tsara shi da ƙarancin buƙatun wutar lantarki, yana ba da gudummawa ga ceton wutar lantarki na tsarin gaba ɗaya.
• Amincewa:Yana amfana da amintaccen ingancin ƙwaƙƙwaran fasahar LED.
• Daidaito:Ana rarraba na'urori (binned) don ƙarfin haske, yana ba da damar daidaita haske a cikin aikace-aikacen nuni da yawa.
• Yin Biyayya da Muhalli:Kunshin ba shi da gubar kuma ya bi umarnin RoHS.

1.2 Gane Na'ura

Lambar sashi LTF-2502KR ta musamman tana nuna nuni mai haɗaɗɗiyar anode (multiplex common anode) ta amfani da guntu LED na AlInGaP Super Red, wanda aka saita tare da maki goma na hannun dama.

2. Zurfin Bincike na Ƙayyadaddun Fasaha

Wannan sashe yana ba da cikakken bincike na haƙiƙa game da iyakokin aiki da halayen aiki na na'urar a ƙarƙashin yanayin gwaji na yau da kullun (Ta=25°C).

2.1 Matsakaicin Matsakaicin Ƙimar

Waɗannan ƙimar suna ayyana iyakokin damuwa waɗanda sama da su lalacewa na dindindin na iya faruwa ga na'urar. Ba a ba da garantin aiki a ƙarƙashin ko a waɗannan iyakokin ba.

• Rushewar Wutar Lantarki a Kowane Bangare:70 mW matsakaici.
• Matsakaicin Halin Gaba na Kowane Bangare:90 mA matsakaici, ana iya yarda da shi kawai a ƙarƙashin yanayin bugun jini (1/10 aikin alhaki, 0.1ms faɗin bugun jini).
• Ci gaba da Halin Gaba na Kowane Bangare:25 mA matsakaici. Wannan ƙimar tana raguwa a layi sama da 25°C a ƙimar 0.33 mA/°C.
• Kewayon Yanayin Zafin Aiki:-35°C zuwa +85°C.
• Kewayon Yanayin Zafin Ajiya:-35°C zuwa +105°C.
• Yanayin Solder Reflow:Na'urar na iya jure zafin gyaɗa na 260°C na tsawon dakika 3 a wani batu 1/16 inch (kusan 1.6 mm) a ƙasa da filin zama.

2.2 Halayen Lantarki & Na Gani

Waɗannan sune sigogin aiki na yau da kullun a ƙarƙashin yanayin aiki na al'ada.

• Matsakaicin Ƙarfin Hasken (I_V):Ya bambanta daga 320 µcd (ƙarami) zuwa 900 µcd (na al'ada) a I_F=1mA. A I_F=10mA, ƙarfin na al'ada shine 11700 µcd. Ma'auni yana bin lanƙwasa amsawar ido na CIE tare da jurewar 15%.
• Matsakaicin Tsawon Tsawon Watsawa (λ_p):639 nm (na al'ada) a I_F=20mA.
• Rabin Faɗin Layin Bakan (Δλ):20 nm (na al'ada) a I_F=20mA, yana nuna tsaftar bakan hasken ja.
• Matsakaicin Tsawon Tsawon (λ_d):631 nm (na al'ada) a I_F=20mA, tare da jurewar ±1 nm.
• Ƙarfin Gaba a Kowane Guntu (V_F):2.0V (ƙarami) zuwa 2.6V (matsakaici) a I_F=20mA, tare da jurewar ±0.1V.
• Halin Baya a Kowane Bangare (I_R):100 µA matsakaici a V_R=5V. Lura: Wannan yanayin gwaji ne; an haramta ci gaba da aikin karkatar da baya.
• Matsakaicin Daidaitawar Ƙarfin Hasken:2:1 matsakaici don sassan da ke cikin yanki mai haske iri ɗaya a I_F=1mA.
• Ƙayyadaddun Magana:≤ 2.5%, yana nuna matakin hasken da ba a so a cikin sassan da ba a zaɓa ba.

3. Bayanin Tsarin Binning

LTF-2502KR yana amfani da tsarin binning na ƙarfin haske don tabbatar da daidaito. Ana rarraba na'urori zuwa kwandon shara (F, G, H, J, K) dangane da fitowar hasken da aka auna a takamaiman gwajin halin yanzu. Wannan yana ba masu zane damar zaɓar nunin daga kwandon shara ɗaya don cimma daidaiton haske a cikin raka'a da yawa a cikin taro, yana hana bambancewar launi ko haske da ake iya gani. Ana ayyana kewayon kwandon shara ta mafi ƙarancin da matsakaicin ƙimar ƙarfin haske a cikin microcandelas (µcd).

4. Bincike na Lanƙwasa Aiki

Takardar bayanan ta haɗa da lanƙwasa halaye na al'ada (bayanan hoto) waɗanda ke da mahimmanci don cikakken binciken ƙira. Waɗannan lanƙwasan suna wakiltar alaƙar tsakanin maɓuɓɓuka masu mahimmanci a zahiri, suna taimaka wa injiniyoyi inganta aiki.

• Halin Gaba da Ƙarfin Gaba (Lanƙwasa I-V):Wannan lanƙwasa yana nuna alaƙar da ba ta layi tsakanin halin yanzu da ke gudana ta LED da faɗuwar ƙarfin lantarki a cikinta. Yana da mahimmanci don ƙirar daidaitaccen kewayen iyakance halin yanzu.
• Ƙarfin Hasken da Halin Gaba:Wannan jadawalin yana kwatanta yadda fitowar haske ke ƙaruwa tare da halin tuƙi, yawanci yana nuna yanki na alaƙar layi kafin yuwuwar jikewa ko raguwar inganci a cikin halin yanzu masu yawa.
• Ƙarfin Hasken da Yanayin Yanayi:Wannan lanƙwasa yana nuna raguwar zafin jiki na fitowar haske. Yayin da yanayin yanayi ya tashi, ƙarfin haske gabaɗaya yana raguwa, wanda dole ne a yi la'akari da shi a cikin sarrafa zafin jiki da zaɓin halin tuƙi.
• Rarraba Bakan:Wani makircin da ke nuna ƙarfin hasken da aka fitar a cikin tsayin raƙuman ruwa daban-daban, wanda ya ta'allaka ne a kusa da matsakaicin tsayin raƙuman ruwa da mafi girma.

5. Bayanin Injiniya & Kunshin

5.1 Girman Kunshin

Nunin ya yi daidai da takamaiman ƙirar injiniya. An ba da duk manyan girma a cikin milimita tare da jurewar daidaitaccen ±0.25 mm sai dai idan an faɗi akasin haka. 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.2 Pin Connection and Circuit Diagram

The device has a 16-pin configuration, though not all pins are active. The internal circuit diagram reveals a multiplexed common anode structure. The pinout is as follows:

• Pins 1, 2, 3, 6, 8, 12, 13, 15: Connect to the cathodes of specific segments (A-G and DP).
• Pins 4, 10, 11, 14, 16: Are the common anode pins for digits 1 through 5, respectively.
• Pins 5, 7, 9: Are marked as "No Connection" (N/C).

This arrangement requires an external driver circuit to sequentially enable each common anode (digit) while driving the appropriate segment cathode lines to form the desired number.

. Soldering, Assembly & Storage Guidelines

.1 Soldering and Assembly

• Adhere strictly to the recommended solder reflow profile (260°C for 3 seconds).
• Avoid applying abnormal mechanical force to the display body during assembly.
• If using a pressure-sensitive pattern film on the display surface, avoid letting it make close contact with the front panel/cover, as external force may shift the film.

.2 Storage Conditions

Proper storage is critical to prevent oxidation of the pins and maintain performance.

• Recommended Standard Conditions:Temperature between 5°C and 30°C with relative humidity below 60% RH, while the product remains in its original moisture-barrier packaging.
• Long-term Storage:Avoid large, long-term inventories. Consume stock promptly.
• Exposure Mitigation:If the moisture-barrier bag is opened or absent for more than 6 months, it is recommended to bake the devices at 60°C for 48 hours and complete assembly within one week to remove absorbed moisture and prevent "popcorning" during reflow.

. Application Recommendations

.1 Intended Use and Design Considerations

The display is designed for ordinary electronic equipment in office, communication, and household applications. For safety-critical applications (aviation, medical, etc.), consultation with the manufacturer is required prior to use. Key design considerations include:

• Drive Circuit Design:Constant current driving is recommended for consistent brightness. The circuit must be designed to accommodate the full V_Frange (2.0V-2.6V). It must also incorporate protection against reverse voltages and transient spikes during power cycling.
• Current and Thermal Management:Do not exceed the absolute maximum ratings for current and power. The operating current should be chosen based on the maximum ambient temperature, considering the derating specified. Excess current or temperature leads to rapid light degradation or failure.
• Multi-Display Applications:When assembling two or more displays in one set, select units from the same luminous intensity bin (see Section 3) to avoid uneven brightness (hue unevenness).
• Environmental Considerations:Avoid rapid temperature changes in humid environments to prevent condensation on the display.

.2 Typical Application Scenarios

Due to its multiplexed design, medium brightness, and clear red digits, the LTF-2502KR is well-suited for:

• Consumer appliance displays (e.g., microwave ovens, coffee makers).
• Test and measurement equipment readouts.
• Industrial control panel indicators.
• Point-of-sale terminal displays.
• Any application requiring a compact, reliable, multi-digit numeric display.

. Technical Comparison & Differentiation

Compared to older technologies like standard GaAsP (Gallium Arsenide Phosphide) red LEDs, the AlInGaP technology used in the LTF-2502KR offers significant advantages:

• Higher Efficiency and Brightness:AlInGaP provides superior luminous efficacy, resulting in brighter output for the same drive current or lower power consumption for the same brightness.
• Better Color Purity:The spectral characteristics (dominant wavelength of ~631nm) produce a more saturated, "true" red compared to the often orange-tinted red of GaAsP.
• Improved Thermal Stability:AlInGaP LEDs generally exhibit less performance degradation with temperature increases compared to older technologies.

. Frequently Asked Questions (Based on Technical Parameters)

Q1: Why is a multiplexed drive scheme used?

A1: Multiplexing significantly reduces the number of required driver pins. A non-multiplexed 5-digit, 7-segment display would need 5x8=40 pins (including decimal). This multiplexed version requires only 5 (anodes) + 8 (cathodes) = 13 active pins, simplifying PCB design and reducing cost.

Q2: What does "common anode" mean for my driver circuit?

A2: In a common anode configuration, you supply a positive voltage (through a current-limiting element or switch) to the anode of the digit you wish to illuminate. You then sink current to ground by pulling the cathodes of the desired segments low. The driver IC must be configured to source current for the anodes.

Q3: How do I select the appropriate current-limiting resistor?

A3: Use the formula R = (V_supply- V_F) / I_F. Use the maximum V_F(2.6V) from the datasheet to ensure sufficient current at the lower end of the tolerance range. Choose I_Fbased on your desired brightness, ensuring it does not exceed the continuous current rating (25 mA, derated for temperature).

Q4: Why is binning important?

A4: Manufacturing variations cause slight differences in light output between individual LEDs. Binning sorts them into groups with similar performance. Using displays from the same bin guarantees visual consistency in your product, which is critical for user perception of quality.

. Design and Usage Case Study

Scenario:Designing a digital timer for a kitchen appliance requiring a 5-digit display (MM:SS or HH:MM format).

Design Steps:

1. Component Selection:The LTF-2502KR is chosen for its appropriate digit size, red color for good visibility, and multiplexed interface to save microcontroller pins.
2. Driver Circuit:A dedicated LED driver IC with multiplexing support is selected. The design uses constant current drivers set to 10 mA per segment to achieve good brightness (typ. 11700 µcd) while staying well within the 25 mA limit.
3. Thermal Consideration:The appliance's internal ambient temperature is estimated to reach 50°C. Using the derating factor (0.33 mA/°C above 25°C), the maximum allowable continuous current per segment is calculated: 25 mA - [0.33 mA/°C * (50°C-25°C)] = 25 mA - 8.25 mA = 16.75 mA. The chosen 10 mA is safe.
4. PCB Layout:The display is placed on the PCB with careful attention to the pinout. Decoupling capacitors are placed near the driver IC. Traces for the common anode lines are sized to handle the peak current of all segments in one digit (up to 8 segments * 10 mA = 80 mA).
5. Software:The microcontroller firmware implements a timer interrupt routine to refresh the display. It cycles through each digit (common anode), turning on the corresponding segments for that digit's value with a duty cycle that prevents flicker.
6. Procurement Note:The Bill of Materials (BOM) specifies "LTF-2502KR, Bin H" to ensure all displays for production have matched brightness.

. Operating Principle

The fundamental principle is based on electroluminescence in a semiconductor p-n junction. When a forward voltage exceeding the diode's turn-on threshold is applied, electrons from the n-type AlInGaP layer recombine with holes from the p-type layer. This recombination event releases energy in the form of photons (light). The specific composition of the AlInGaP alloy determines the bandgap energy, which directly defines the wavelength (color) of the emitted light—in this case, red at approximately 631 nm. The seven-segment structure is formed by arranging multiple individual LED chips (or chip segments) in the classic "8" pattern, with each segment electrically isolated and independently addressable.

. Technology Trends

While discrete seven-segment displays like the LTF-2502KR remain vital for specific applications, broader display technology trends are relevant:

• Integration:There is a trend towards integrating the LED driver, microcontroller, and sometimes even the display into more compact modules or smart displays.
• Materials Evolution:While AlInGaP is efficient for red/orange/yellow, InGaN (Indium Gallium Nitride) technology dominates the blue/green/white spectrum and continues to improve in efficiency and cost.
• Alternative Technologies:For more complex graphics or alphanumerics, dot-matrix LED displays, OLEDs, or LCDs are often preferred. However, seven-segment LEDs retain advantages in sunlight readability, ruggedness, simplicity, and cost for pure numeric applications.
• Smart Control:Drive schemes are increasingly leveraging advanced microcontrollers with PWM capabilities for dimming and intensity control, enhancing functionality beyond simple on/off.