LTS-546AJG 0.52-Inchi Seven-Segment LED Display Datasheet - Character Height 13.2mm - Green (AlInGaP) - Forward Voltage 2.6V - Power Consumption 70mW - Technical Documentation

1. Product Overview

The LTS-546AJG is a single-digit, seven-segment character display module. Its primary function is to provide clear, legible numeric or limited character readouts in electronic devices. Its core technology is based on Aluminum Indium Gallium Phosphide (AlInGaP) semiconductor material grown on a Gallium Arsenide (GaAs) substrate, engineered to emit green light. This material choice is significant, as AlInGaP LEDs are renowned for their high efficiency and brightness in the red to yellow-green portion of the spectrum. The device features a gray face with white segment outlines, enhancing contrast and improving character appearance under various lighting conditions. It is binned for luminous intensity, meaning devices are sorted and classified based on their measured light output to ensure consistency in applications where multiple displays are used side-by-side.

1.1 Key Features and Core Advantages

• Ukubwa wa Nambari:Urefu wa herufi wa inchi 0.52 (milimita 13.2) unapatikana usawa kati ya uwezo wa kusomeka na ukubwa mdogo, unaofaa kwa paneli za kipima, vifaa vya kupima na vya umeme vya watumiaji.
• Ubora wa Kioo:Onyesho hutoa sehemu zinazofuatana na zenye usawa, zenye mwangaza wa juu na tofauti ya juu, na hivyo kufanikisha muonekano bora wa herufi.
• Pembe ya Kuona:Ina pembe pana ya kuona, ikihakikisha kuwa onyesho bado linasomeka wazi hata linapotazamwa kutoka nafasi isiyo kwenye mhimili.
• Ufanisi wa nishati:Matumizi ya nishati ya chini, inafaa kwa vifaa vinavyotumia betri au vinavyozingatia matumizi ya nishati.
• Uthabiti:Kama kifaa thabiti, ina uaminifu wa juu na maisha marefu ya matumizi ikilinganishwa na vionyeshi vya mitambo au tupu.
• Uzingatiaji wa mazingira:Ufungaji umebuniwa bila risasi, unakidhi maagizo ya RoHS (Vizuizi vya Vitu Hatari).

1.2 Utambulishaji na Usanidi wa Kifaa

Nambari ya Sehemu LTS-546AJG inabainisha kifaa cha Chip cha LED ya Kijani cha AlInGaP kilichosanidiwa kwa usanidi wa anodi ya pamoja. Alama ya "Rt. Hand Decimal" inaonyesha uwepo wa nukta ya desimali ya mkono wa kulia. Katika onyesho la anodi ya pamoja, anodi (vituo vyema) vya sehemu zote za LED zimeunganishwa ndani. Ili kuwashe sehemu maalum, ni lazima pini yake inayolingana ya katodi (kituo hasi) isukumwe kwa kiwango cha chini (kutegemea ardhi au voltage ya chini), huku anodi ya pamoja ikibaki na voltage chanya. Usanidi huu ni wa kawaida na kwa kawaida unaweza kurahisisha muundo wa saketi wakati wa kutumia kidhibiti kidogo au kisukuma cha mkondo cha transistor.

2. Vigezo vya Kiufundi: Ufafanuzi wa kina na usio na upendeleo

2.1 Absolute Maximum Ratings

These ratings define the stress limits that may cause permanent damage to the device. Operation at or beyond these limits is not guaranteed.

• Power dissipation per segment:Maximum 70 mW. Exceeding this value may cause overheating and catastrophic failure.
• Peak forward current per segment:60 mA under pulse conditions (1/10 duty cycle, 0.1 ms pulse width). This rating applies to short, high-current pulses used during multiplexing.
• Kila sehemu ya mkondo endelevu wa mbele:Ni 25 mA kwenye 25°C. Mkondo huu lazima upunguzwe kwa mstari kwa kiwango cha 0.33 mA/°C wakati joto la mazingira (Ta) linazidi 25°C. Kwa mfano, kwenye 50°C, mkondo endelevu wa juu zaidi ni takriban 25 mA - (0.33 mA/°C * 25°C) = 16.75 mA.
• Safu ya joto:Operating and storage temperature range is -35°C to +85°C.
• Soldering conditions:Wave soldering or reflow soldering should be performed with the solder joint located 1/16 inch (≈1.6 mm) below the mounting plane, for up to 3 seconds at a maximum of 260°C.

I-V (Current-Voltage) Curve: Shows the relationship between forward voltage and forward current. It is nonlinear, featuring a threshold voltage (approximately 1.8-2.0V for AlInGaP) below which little current flows. This curve aids in designing appropriate current-limiting circuitry. Luminous Intensity vs. Forward Current (IV vs. IF): Shows how light output increases with drive current. It is typically linear at lower currents but may saturate at higher currents due to thermal effects and efficiency droop. Luminous Intensity vs. Ambient Temperature: Shows how light output decreases as junction temperature rises. This is critical for designing systems that operate over a wide temperature range. Spectral Distribution Graph: A plot of relative intensity versus wavelength, showing a peak at 571 nanometers and a half-width of 15 nanometers.

Hizi ni vigezo vya kawaida vya utendaji vilivyopimwa chini ya hali maalum za majaribio (Ta=25°C).

• Nguvu ya wastani ya mwanga (I_V):At a forward current (I_F) of 1 mA, the range is from 200 microcandelas (minimum) to 577 microcandelas (typical). The luminous intensity is measured using a filter matching the CIE photopic response curve, with a tolerance of ±15%.
• Wavelength parameters:
  • Peak emission wavelength (λ_p): 571 nanometers (at I_F=20 mA).
  • Dominant wavelength (λ_d): 572 nanometers (at I_F=20 mA), with a tolerance of ±1 nanometer. This is the wavelength of monochromatic light that the human eye perceives as matching the color of the LED.
  • Upana wa nusu ya mstari wa wigo (Δλ): 15 nm (kwa I_F=20 mA). Hii inaonyesha usafi wa wigo; thamani ndogo inamaanisha mwanga uko karibu zaidi na monokromia.
• Voltage ya mbele kwa kila chip (V_F):kwa I_F=20 mA ni 2.1 V hadi 2.6 V, na uvumilivu wa ±0.1 V. Hii ni kigezo muhimu cha kubuni saketi ya kuendesha.
• Reverse current (I_R):At a reverse voltage (V_R) of 5 volts, maximum 100 microamperes. This test is for characterization only; continuous reverse bias operation is prohibited.
• Luminous intensity matching ratio:Uwiano wa mkali zaidi kati ya sehemu ndani ya onyesho moja ni 2:1. Hii inamaanisha chini ya hali sawa za kuendesha, tofauti ya mwangaza kati ya sehemu yenye mwanga zaidi na ile yenye giza zaidi haizidi mara mbili, kuhakikisha usawa.
• Uingiliaji:Imewekwa kuwa ≤2.5%. Hii inarejelea mwanga usiotakiwa wa sehemu unaotokana na uvujaji wa ndani wa umeme au mwanga wakati sehemu zilizo karibu zinakuwa zinaendeshwa.

3. Maelezo ya Mfumo wa Kupanga

The datasheet clearly states that the device is "binned by luminous intensity." This means that during production, LEDs are tested and sorted into different groups (bins) based on their measured light output at a standard test current. This is crucial for applications using multiple display panels, as it prevents noticeable brightness differences between units. Designers should specify or ensure that panels from the same or adjacent bins are obtained to maintain overall visual consistency of the product. Although not detailed in this excerpt, binning may also apply to forward voltage (V_F) and dominant wavelength (λ_d), the latter having a specified tolerance of ±1 nm.

4. Performance Curve Analysis

The datasheet references "Typical Electrical/Optical Characteristic Curves," which are essential for understanding the device's behavior beyond single-point specifications. These curves typically include:

• I-V (Current-Voltage) Curve:It shows the relationship between forward voltage and forward current. It is nonlinear, with a threshold voltage (approximately 1.8-2.0 volts for AlInGaP) below which almost no current flows. This curve aids in designing appropriate current-limiting circuits.
• Luminous Intensity vs. Forward Current (I_Vvs. I_F):Inaonyesha jinsi pato la mwanga linavyoongezeka kwa kuongezeka kwa mkondo wa kuendesha. Kwa mikondo ya chini kwa kawaida ni laini, lakini kwa mikondo ya juu inaweza kujaa kutokana na athari za joto na kupungua kwa ufanisi.
• Nguvu ya mwanga vs. Joto la mazingira:Inaonyesha jinsi pato la mwanga linavyopungua kwa kuongezeka kwa joto la kiungo. Hii ni muhimu sana kwa kubuni mifumo inayofanya kazi katika anuwai pana ya joto.
• Mchoro wa Usambazaji wa Wigo:Mchoro wa Uhusiano wa Nguvu ya Jamaa na Urefu wa Wimba, unaonyesha kilele cha 571 nm na upana wa nusu ya 15 nm.

Mikondo hii inawawezesha wahandisi kuboresha hali ya kuendesha kwa lengo maalum la mwangaza, ufanisi na maisha ya huduma.

5. Mechanical and Packaging Information

4. Uchambuzi wa Mviringo wa Utendaji

This display complies with the standard through-hole DIP (Dual In-line Package) style. Key dimensional descriptions include:

• All dimensions are in millimeters, and unless otherwise specified, the general tolerance is ±0.25 mm.
• The pin tip offset tolerance is ±0.4 mm.
• Quality control limits are set for foreign objects (≤10 mils), ink contamination (≤20 mils), and bubbles within segments (≤10 mils).
• Kikomo cha kupinda kifuatacho ni ≤1% ya urefu wake.

Mchoro halisi wa vipimo (ambao haujaelezewa kikamilifu katika maandishi) utafafanua urefu wa jumla, upana, kina, vipimo vya nambari, vipimo vya sehemu za sehemu, pamoja na nafasi halisi na kipenyo cha pini 10.

5.2 Muunganisho wa Pini na Utambuzi wa Upekee

The device employs a 10-pin configuration (Pin 1 is marked as "No Connect"). The internal circuit diagram and pin definition table indicate a common-anode design, with two common anode pins (3 and 8). Segment cathodes are assigned to specific pins: E(1), D(2), C(4), DP(5), B(6), A(7), F(9), G(10). Correct identification of Pin 1 (typically indicated on the package by a notch, bevel, or dot) is crucial for proper orientation during PCB assembly.

6. Soldering, Assembly, and Storage Guidelines

6.1 Ushirikiano na Usanikishaji

Inabainisha hali ya juu zaidi ya uchimbaji. Kwa uchimbaji wa mikono, chuma cha kuchomea chenye udhibiti wa joto kinapaswa kutumiwa, ili kuepuka kuzidi kikomo cha 260°C kwenye pini. Tahadhari inaonya dhidi ya kutumia zana au mbinu zisizofaa kutumia nguvu isiyo ya kawaida kwenye kiini cha onyesho. Zaidi ya hayo, ikiwa filamu ya mapambo imewekwa kwenye uso wa onyesho, haipaswi kubanwa kwa nguvu dhidi ya paneli ya mbele, kwani nguvu za nje zinaweza kusababisha kuhamishwa kwake.

6.2 Masharti ya Uhifadhi

Proper storage is crucial to prevent pin oxidation and moisture absorption.

• For LED displays (through-hole type):Hifadhi kwenye mfuko wa asili, halijoto kati ya 5°C hadi 30°C, unyevunyevu wa jamaa chini ya 60%. Ikiwa imehifadhiwa nje ya mfuko wa kuzuia unyevu au mfuko umefunguliwa kwa zaidi ya miezi 6, inashauriwa kuokwa kwenye 60°C kwa masaa 48 kabla ya matumizi, na kukamilisha usakinishaji ndani ya wiki moja.
• Kanuni za Jumla:Epuka kuhifadhi kwa muda mrefu. Tumia hisa kwa wakati. Uhifadhi usiofaa unaweza kuhitaji upakuaji tena wa pini zilizooza kabla ya matumizi.

7. Mapendekezo ya Matumizi na Mambo ya Kuzingatia katika Ubunifu

7.1 Matumizi Lengwa na Tahadhari

This display is suitable for general electronic equipment: office equipment, communication equipment, and household appliances. It is explicitly stated that consultation is required for applications demanding extremely high reliability where failure could endanger life or health (e.g., aviation, medical systems). Designers must adhere to the absolute maximum ratings.

7.2 Key Design Considerations

• Njia ya Kuendesha:Inashauriwa kikamilifu kutumia udhibiti wa mkondo wa mara kwa mara badala ya udhibiti wa voltage ya mara kwa mara, ili kuhakikisha mwangaza thabiti na maisha marefu, kwani mwangaza wa LED unategemea mkondo, sio voltage.
• Kikomo cha Mkondo:Saketi ya kuendesha lazima itengenezwe kwa kukabiliana na anuwai kamili ya voltage chanya (2.1V hadi 2.6V) ili kutoa mkondo unaotarajiwa kwa vifaa vyote.
• Usimamizi wa Joto:Mkondo salama wa uendeshaji lazima upunguzwe kulingana na hali ya juu zaidi ya joto la mazingira. Mkondo mkubwa kupita kiasi au joto la juu linaweza kusababisha kupungua kwa mwanga kwa kasi au kushindwa mapema.
• Reverse Bias Protection:The circuit must prevent reverse voltage and voltage spikes during power cycling to avoid metal migration and increased leakage current.
• Environmental Protection:Epuka mabadiliko ya ghafla ya joto katika mazingira yenye unyevunyevu ili kuzuia umajimaji wa mvuke kwenye skrini.
• Uthabiti wa usanidi wa skrini nyingi:Tumia daima skrini kutoka kwa safu sawa ya ukali wa mwanga ili kuepuka usawa wa mwangaza (tone) katika usomaji wa tarakimu nyingi.

8. Ulinganisho wa Kiufundi na Tofauti

Ikilinganisha na teknolojia za zamani kama vile taa za incandescent au onyesho la fluorescent ya utupu (VFD), LTS-546AJG inatoa uaminifu bora wa hali thabiti, matumizi ya nguvu ya chini, na uwezo wa juu wa kukabiliana na mshtuko na mtikisiko. Katika soko la mabomba ya tarakimu za LED, inatumia teknolojia ya AlInGaP kutoa mwanga wa kijani, ambayo ni bora zaidi kuliko LED ya kijani ya zamani ya GaP (gallium phosphide), na inaweza kuwa mkali zaidi. Usanidi wa anode ya pamoja ni moja ya aina mbili za kawaida (nyingine ni cathode ya pamoja), na uchaguzi kati ya hizo mbili hutegemea hasa usanidi wa pato la IC ya kuendesha au microcontroller (mkondo wa chanzo dhidi ya mkondo wa kufyonza).

9. Maswali Yanayoulizwa Mara kwa Mara (Kulingana na Vigezo vya Kiufundi)

1. Swali: Kuna tofauti gani kati ya urefu wa wimbi la kilele na urefu wa wimbi kuu?Jibu: Urefu wa wimbi wa kilele ni urefu wa wimbi mmoja katika sehemu ya juu zaidi ya wigo wa utoaji. Urefu wa wimbi mkuu ni urefu wa wimbi wa mwanga wa rangi moja ambao jicho la mwanadamu linaona kulingana na rangi ya LED. Kwa kawaida, hizi thamani ziko karibu lakini si sawa kabisa, hasa kwa wigo mpana.
2. Swali: Kwa nini inashauriwa kutumia kiendeshi cha mkondo wa mara kwa mara?Jibu: Mwanga unaotolewa na LED unalingana moja kwa moja na mkondo wa mbele. Chanzo cha mkondo wa mara kwa mara kinaweza kusawazisha tofauti za voltage ya mbele (V_F) kati ya vifaa tofauti na pia kutokana na mabadiliko ya joto, na kuhakikisha mwangaza unaoendelea na sawa.
3. Je: Naweza kutumia pini ya microcontroller ya 5V kuendesha skrini hii moja kwa moja?Jibu: Hapana. Ni lazima utumie upinzani wa kudhibiti mkondo au saketi maalum ya kuendesha. Kuunganisha moja kwa moja kunaweza kuzidi mkondo wa juu unaoruhusiwa unaoendelea, na kuharibu LED. Fomula ya kuhesabu thamani ya upinzani ni R = (V_{Power supply}- V_F) / I_F.
4. Q: What does "binned by luminous intensity" mean for my design?A: This means you should specify to the supplier that you need units from the same bin code, especially when using multiple displays in one product, to ensure uniform brightness across all digits.

10. Mfano wa Matumizi Halisi

Tukio: Kubuni Onyesho Rahisi la Kipimajio cha Umeme cha Nambari.Kipaza sauti cha kidhibiti kidogo husoma voltage. Firmware hubadilisha thamani hii kuwa nambari ya desimali. Ili kuonyesha kwenye LTS-546AJG, kidhibiti kidogo kitatumia IC ya kuendesha (kama kiwango cha kuhama cha 74HC595 chenye upinzani wa kudhibiti mkondo au kiendesha maalum cha LED kama MAX7219). Pini ya anode ya kawaida itaunganishwa kwenye usambazaji chanya wa umeme (mfano, kupitia transistor kwa 5V ikiwa inatumia multiplexing). Kidhibiti kidogo kitaweka mfululizo pini za cathode za sehemu zinazofanana kwenye ardhi (kiwango cha chini) ili kuunda tarakimu inayohitajika. Saketi ya kuendesha itabuniwa kutoa mkondo wa mara kwa mara wa 15-20 milliamperes kwa kila sehemu, chini sana kuliko kiwango cha mfululizo cha 25 milliamperes, thamani ya upinzani ikikokotolewa kulingana na V ya hali mbaya zaidi_F(2.6 volts). Kwa mita yenye tarakimu nyingi, onyesho kutoka kwa safu sawa ya nguvu ya mwanga litatumika.

11. Kanuni ya Uendeshaji

LTS-546AJG hufanya kazi kulingana na kanuni ya umeme-inayosababisha mwanga ya makutano ya nusu-uwazi p-n. Unapotumia voltage chanya (anodi chanya kuhusiana na katodi) inayozidi voltage ya kizingiti ya diode, elektroni kutoka kwa nyenzo za n-aina AlInGaP/GaAs hushirikiana na mashimo kutoka kwa nyenzo za p-aina. Tukio hili la ushirikiano hutoa nishati kwa njia ya fotoni (mwanga). Muundo maalum wa aloi ya AlInGaP huamua nishati ya pengo la bendi, na kwa hivyo hufafanua urefu wa wimbi la mwanga unaotolewa (rangi) — katika mfano huu, takriban nanomita 572 ya mwanga wa kijani. Kila moja ya sehemu saba (pamoja na nukta ya desimali) ina chip moja au zaidi za LED ndogo. Usanidi wa anodi ya pamoja unaunganisha anodi zote ndani, na unahitaji udhibiti wa nje kwa kila katodi.

12. Mwelekeo wa Teknolojia

Ingawa maonyesho ya sehemu saba bado ni msingi wa usomaji wa tarakimu, uwanja mpana wa teknolojia ya maonyesho ya LED unaendelea kubadilika. Mwelekeo ni pamoja na:Miniaturization and Integration:Develop displays with finer pitch and Chip-on-Board (COB) technology.Advanced Materials:Endelea kuchunguza vifaa vyenye ufanisi zaidi, kama vile Gallium Nitride (GaN), ili kufikia anuwai ya rangi pana na ufanisi wa juu zaidi, ingawa AlInGaP bado inatawala katika uwanja wa mwanga mwekundu-ambarini-manjano-kijani wenye ufanisi wa juu.Skrini Zenye Akili:Unganisha moja kwa moja kichocheo cha IC, kumbukumbu, na kiingilio cha mawasiliano (I2C, SPI) kwenye moduli ya kuonyesha, ili kurahisisha muundo wa mfumo.Uwezo wa Kubadilika na Umbo Lisilo la Kawaida:Kukuza skrini zinazopindika au zenye sehemu zilizopinda kwa muundo mpya wa bidhaa.