PCF8545BTT - 320-Segment 1:8 Multiplex LCD Driver | NXP
MPN: PCF8545BTT ⚠ רכישה אחרונהPCF8545BTT סקירה
A multiplex-rate LCD driver is a type of display driver IC that sequentially drives multiple rows (backplanes) and columns (segments) of a passive-matrix liquid crystal display; the PCF8545 belongs to the segment-driver IC family, which sits within display drivers > LED & Optoelectronics > semiconductors. Compared to character-matrix LCD controllers, segment drivers give the designer freedom to implement arbitrary graphic icons, alphanumeric fields, or numeric 7-segment digits on a custom glass, and they are commonly used in white goods, audio equipment, metering, and small automotive clusters.
Key features include 80 character × 4 line drive capability, software-selectable multiplex rates from 1:1 to 1:8, integrated temperature compensation, low-power mode, and a programmable frame frequency. The PCF8545BTT/AJ variant is qualified to AEC-Q100 for automotive applications, and the device retains all electrical characteristics across the industrial -40C to +85C operating range.
From an architectural standpoint, the PCF8545 stores the displayed pattern in an internal 320-bit display RAM and refreshes the panel autonomously. Communication overheads are minimized using auto-incremented addressing, allowing the host MCU to write sequential RAM bytes without re-issuing column addresses. An on-chip bias generator produces the required bias voltages so the system needs only a single external capacitor to stabilize the charge pump.
Typical applications include metering instrumentation (electricity, gas, water meters), white-goods human-machine interfaces, audio equipment displays, small automotive instrument clusters, point-of-sale terminals, and any embedded product requiring a custom LCD glass. The wide supply range and low power consumption make the PCF8545BTT particularly attractive for battery-powered devices.
When designing with the PCF8545BTT, ensure the SPI bus speed does not exceed the 5 MHz maximum and that the OSC pin capacitor selection matches the desired frame frequency. The /RES pin must be toggled during power-up to place the device into a known state before any SPI transactions begin.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including EOL context and pin-compatible upgrade options for the PCF8545BTT family.
חלופות תחליף ישיר עבור PCF8545BTT — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
PCF8545BTT/AJ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF8545BTT/AY
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF8545ATT/AY
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF8576DT/2,118
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF8536BT/1,118
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCA8536BT/Q900/1,1
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF8545BTT מפרטים
| Display Type | LCD, multiplexed up to 1:8 |
| Number of Segments | 320 segments |
| Number of Backplanes | Up to 8 |
| ממשק | 3-wire SPI (PCF8545B variant) |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Supply Current (typ.) | 30 uA |
| Configuration | 20 characters x 4 lines, or 40 characters x 4 lines, or 320 elements |
| Multiplex Rate | 1:1 to 1:8 (software-selectable) |
| טמפרטורת פעולה | -40C to +85C |
| מארז | 56-pin TSSOP |
| סוג הרכבה | Surface Mount |
| On-chip RAM | 320-bit display RAM with auto-increment |
| Temperature Compensation | Yes, internal |
| Low-power Mode | Yes |
| AEC-Q100 (AJ variant) | Qualified |
| סטטוס RoHS | Compliant |
תצורת פינים של PCF8545BTT
| פין 1 | BP0 — Backplane output 0 |
| פין 2 | BP1 — Backplane output 1 |
| פין 3 | BP2 — Backplane output 2 |
| פין 4 | BP3 — Backplane output 3 |
| פין 5 | BP4 — Backplane output 4 |
| פין 6 | BP5 — Backplane output 5 |
| פין 7 | BP6 — Backplane output 6 |
| פין 8 | BP7 — Backplane output 7 |
| פין 9 | VDD — Positive supply voltage |
| פין 10 | VSS — Ground |
| פין 11 | VLCD — LCD supply voltage |
| פין 12 | S0 — Segment output 0 |
| פין 13 | S1 — Segment output 1 |
| פין 14 | S2 — Segment output 2 |
| פין 15 | S3 — Segment output 3 |
| פין 16 | S4 — Segment output 4 |
| פין 17 | S5 — Segment output 5 |
| פין 18 | S6 — Segment output 6 |
| פין 19 | S7 — Segment output 7 |
| פין 20 | S8 — Segment output 8 |
| פין 21 | S9 — Segment output 9 |
| פין 22 | S10 — Segment output 10 |
| פין 23 | S11 — Segment output 11 |
| פין 24 | S12 — Segment output 12 |
| פין 25 | S13 — Segment output 13 |
| פין 26 | S14 — Segment output 14 |
| פין 27 | S15 — Segment output 15 |
| פין 28 | S16 — Segment output 16 |
| פין 29 | S17 — Segment output 17 |
| פין 30 | S18 — Segment output 18 |
| פין 31 | S19 — Segment output 19 |
| פין 32 | S20 — Segment output 20 |
| פין 33 | S21 — Segment output 21 |
| פין 34 | S22 — Segment output 22 |
| פין 35 | S23 — Segment output 23 |
| פין 36 | S24 — Segment output 24 |
| פין 37 | S25 — Segment output 25 |
| פין 38 | S26 — Segment output 26 |
| פין 39 | S27 — Segment output 27 |
| פין 40 | S28 — Segment output 28 |
| פין 41 | S29 — Segment output 29 |
| פין 42 | S30 — Segment output 30 |
| פין 43 | S31 — Segment output 31 |
| פין 44 | S32 — Segment output 32 |
| פין 45 | S33 — Segment output 33 |
| פין 46 | S34 — Segment output 34 |
| פין 47 | S35 — Segment output 35 |
| פין 48 | S36 — Segment output 36 |
| פין 49 | S37 — Segment output 37 |
| פין 50 | S38 — Segment output 38 |
| פין 51 | S39 — Segment output 39 |
| פין 52 | CLK — External clock input / oscillator pin |
| פין 53 | SYNC — Frame sync / cascade input |
| פין 54 | /RES — Reset (active low) |
| פין 55 | SCL — SPI clock input |
| פין 56 | SDI — SPI data input |
יישומים טיפוסיים
PCF8545BTT מתאים עבור 6 יישוםs: Electricity Meter LCD Display, White-Goods Human-Machine Interface, Audio Equipment Display, Small Automotive Instrument Cluster, Point-of-Sale Terminal Display, Industrial Process Meter.
Electricity Meter LCD Display
The PCF8545BTT is ideal for single-phase and polyphase electricity meter displays where 6 to 8 digit numeric fields plus iconographic indicators (kWh, V, A, power factor) must be rendered on a custom glass. The 320-segment capacity with 1:8 multiplex lets the meter designer combine the main kWh readout, tariff indicator, status icons, and historical bar graph on one chip without an external segment driver. The 30 uA typical supply current keeps quiescent draw within IEC 62053-21 meter power budgets, and the wide 2.5 V to 5.5 V supply range allows direct battery or super-cap backup during line-power outages. The SPI bus simplifies connection to energy-meter metrology MCUs that already expose an SPI peripheral.
מומלץ
White-Goods Human-Machine Interface
Washing machines, dishwashers, and refrigerators rely on segment LCDs that combine 7-segment digits with custom icons for cycle, temperature, and status indication. The PCF8545BTT's 320-segment capacity supports a complete appliance front panel including program name, spin speed, remaining time, and 16+ status icons. The on-chip temperature compensation keeps contrast consistent across the cold-to-hot range of a kitchen environment, and the software-selectable multiplex rate lets one driver IC serve multiple appliance families with different glass designs. The AEC-Q100 qualified /AJ variant supports laundry equipment with extended thermal profiles.
מומלץ
Audio Equipment Display
Hi-fi amplifiers, receivers, and portable audio players often use segment LCDs to show volume, source, frequency, and track information. The PCF8545BTT drives a typical audio front panel with VU-meter bars, source labels (CD/AUX/BT), and a 16-character alphanumeric readout, all from a single 56-pin TSSOP. The 30 uA supply current is negligible compared to the audio chain, and the on-chip bias generator eliminates external boost capacitors that would otherwise increase BOM cost. The auto-incremented display RAM keeps SPI traffic low so the audio DSP can keep bandwidth for sample-rate conversion.
מומלץ
Small Automotive Instrument Cluster
Motorcycles, e-bikes, and small EVs use compact instrument clusters that combine a speedometer, fuel/battery gauge, odometer, and warning icons on a single LCD glass. The PCF8545BTT/AJ automotive-qualified variant supports the AEC-Q100 temperature range and delivers 320 segments at 1:8 multiplex, enough for a full motorcycle cluster on one chip. The SPI bus interfaces directly to automotive MCUs like the S32K1 family, and the on-chip temperature compensation is critical for outdoor cluster contrast stability from -40C cold-start to +85C summer sun. The TSSOP-56 footprint drops into existing PCF8545BTT layouts for cost-down migration.
מומלץ
Point-of-Sale Terminal Display
POS terminals and handheld payment devices use compact segment LCDs to show transaction amount, item count, and status indicators. The PCF8545BTT drives a typical 12-digit amount field plus 24 icons (WiFi, battery, signature OK, contact/contactless) in one IC, simplifying PCB layout in space-constrained handheld enclosures. The wide supply range (2.5 V to 5.5 V) supports both rechargeable Li-ion and coin-cell backup scenarios, and the 30 uA quiescent current preserves battery life between transactions. The SPI bus allows direct connection to the secure-element MCU that already handles EMV transactions.
מומלץ
Industrial Process Meter
Industrial panel meters for temperature, pressure, flow, and level measurement use segment LCDs to display measured value, engineering units, and alarm status. The PCF8545BTT drives a typical 4.5-digit process display plus bar graph and alarm icons, fitting the standard 96x96 mm DIN panel cutout. The -40C to +85C industrial operating range supports outdoor panel installations, and the on-chip charge pump removes the need for an external boost supply in 3.3 V systems. The TSSOP-56 footprint allows the same PCB to be reused for different process variables by changing only the metrology front-end.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PCF8545BTT — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PCF8545BTT/AJ | PCF8545BTT/AY | PCF8545ATT/AY | PCF8576DT/2,118 | PCF8536BT/1,118 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 56-pin TSSOP | 56-pin TSSOP - same | 56-pin TSSOP - same | 56-pin TSSOP - same | 56-pin TSSOP - same | 56-pin TSSOP - same |
| Interface | 3-wire SPI | 3-wire SPI | 3-wire SPI | 2-wire I2C | 2-wire I2C | 2-wire I2C / SPI |
| Number of Segments | 320 segments | 320 segments | 320 segments | 320 segments | 160 segments (-50%) | 160 segments (-50%) |
| Multiplex Rate | 1:1 to 1:8 | 1:1 to 1:8 | 1:1 to 1:8 | 1:1 to 1:8 | 1:1 to 1:4 | 1:1 to 1:4 |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Automotive Grade (AEC-Q100) | No (BTT only) | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) | No | Yes (PCA8536BT/Q900) |
| Unit Price (qty 1, USD, as of 2026-10-09) | $1.45 | $1.60 (est.) | $1.41 | $1.30 (est.) | $1.80 (est.) | $1.50 (est.) |
מבדילים עיקריים
- 320-segment capacity with 1:8 multiplex in single TSSOP-56 chip (לעומתPCF8576DT/2,118)
- AEC-Q100 automotive-grade option in same footprint (לעומתPCF8545BTT (non-automotive))
- On-chip charge pump eliminates external boost components (לעומתDiscrete segment driver with external boost)
הערות תכנון
The PCF8545BTT draws a typical 30 uA supply current but peaks higher during SPI write bursts and during charge-pump switching. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin, and add a 1 uF bulk capacitor at the IC supply pin. The on-chip bias generator only requires a single 100 nF capacitor on VLCD; do not omit this capacitor or the LCD contrast will be unstable. For battery-backed applications, the VLCD pin can be tied to VDD to disable the charge pump and reduce current to approximately 5 uA.
Route the SPI bus (SCL, SDI, /RES) as short matched traces to minimize ringing; keep them away from the LCD segment outputs to avoid coupling noise into the display. The 56-pin TSSOP has a thermal pad (or center lead frame) that should be soldered to a copper pour for mechanical reliability, even though the chip dissipates minimal power. Place the VLCD bypass capacitor directly at the VLCD pin and use a wide ground pour under the entire IC for stable bias generation. Keep the segment and backplane traces short and balanced to maintain uniform LCD contrast across the glass.
Do not exceed the SPI clock frequency of 5 MHz, or display RAM corruption can occur. Always toggle the /RES pin low then high during power-up before the first SPI transaction, otherwise the device may not initialize correctly. When migrating between PCF8545BTT (SPI) and PCF8545ATT (I2C), verify that the host firmware uses the correct command set - the RAM addressing scheme is the same but the bus protocol differs. The PCF8545BTT is in last-time-buy status per NXP's product page, so new designs should select the AEC-Q100 qualified /AJ variant to ensure long-term supply.
מידע על תאימות
PCF8545BTT base part is RoHS and REACH compliant but not AEC-Q100 qualified; choose PCF8545BTT/AJ suffix for AEC-Q100 automotive grade. Halogen-free per NXP packaging materials disclosure.
