PCF8545BTT - 320-Segment 1:8 Multiplex LCD Driver | NXP
MPN: PCF8545BTT ⚠ Lần mua cuốiPCF8545BTT Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho PCF8545BTT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
PCF8545BTT/AJ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCF8545BTT/AY
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCF8545ATT/AY
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCF8576DT/2,118
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCF8536BT/1,118
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA8536BT/Q900/1,1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCF8545BTT Thông số kỹ thuật
| Display Type | LCD, multiplexed up to 1:8 |
| Number of Segments | 320 segments |
| Number of Backplanes | Up to 8 |
| Giao diện | 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) |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 56-pin TSSOP |
| Kiểu lắp đặt | 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 |
| Trạng thái RoHS | Compliant |
Cấu hình chân PCF8545BTT
| Chân 1 | BP0 — Backplane output 0 |
| Chân 2 | BP1 — Backplane output 1 |
| Chân 3 | BP2 — Backplane output 2 |
| Chân 4 | BP3 — Backplane output 3 |
| Chân 5 | BP4 — Backplane output 4 |
| Chân 6 | BP5 — Backplane output 5 |
| Chân 7 | BP6 — Backplane output 6 |
| Chân 8 | BP7 — Backplane output 7 |
| Chân 9 | VDD — Positive supply voltage |
| Chân 10 | VSS — Ground |
| Chân 11 | VLCD — LCD supply voltage |
| Chân 12 | S0 — Segment output 0 |
| Chân 13 | S1 — Segment output 1 |
| Chân 14 | S2 — Segment output 2 |
| Chân 15 | S3 — Segment output 3 |
| Chân 16 | S4 — Segment output 4 |
| Chân 17 | S5 — Segment output 5 |
| Chân 18 | S6 — Segment output 6 |
| Chân 19 | S7 — Segment output 7 |
| Chân 20 | S8 — Segment output 8 |
| Chân 21 | S9 — Segment output 9 |
| Chân 22 | S10 — Segment output 10 |
| Chân 23 | S11 — Segment output 11 |
| Chân 24 | S12 — Segment output 12 |
| Chân 25 | S13 — Segment output 13 |
| Chân 26 | S14 — Segment output 14 |
| Chân 27 | S15 — Segment output 15 |
| Chân 28 | S16 — Segment output 16 |
| Chân 29 | S17 — Segment output 17 |
| Chân 30 | S18 — Segment output 18 |
| Chân 31 | S19 — Segment output 19 |
| Chân 32 | S20 — Segment output 20 |
| Chân 33 | S21 — Segment output 21 |
| Chân 34 | S22 — Segment output 22 |
| Chân 35 | S23 — Segment output 23 |
| Chân 36 | S24 — Segment output 24 |
| Chân 37 | S25 — Segment output 25 |
| Chân 38 | S26 — Segment output 26 |
| Chân 39 | S27 — Segment output 27 |
| Chân 40 | S28 — Segment output 28 |
| Chân 41 | S29 — Segment output 29 |
| Chân 42 | S30 — Segment output 30 |
| Chân 43 | S31 — Segment output 31 |
| Chân 44 | S32 — Segment output 32 |
| Chân 45 | S33 — Segment output 33 |
| Chân 46 | S34 — Segment output 34 |
| Chân 47 | S35 — Segment output 35 |
| Chân 48 | S36 — Segment output 36 |
| Chân 49 | S37 — Segment output 37 |
| Chân 50 | S38 — Segment output 38 |
| Chân 51 | S39 — Segment output 39 |
| Chân 52 | CLK — External clock input / oscillator pin |
| Chân 53 | SYNC — Frame sync / cascade input |
| Chân 54 | /RES — Reset (active low) |
| Chân 55 | SCL — SPI clock input |
| Chân 56 | SDI — SPI data input |
Ứng dụng tiêu biểu
PCF8545BTT phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PCF8545BTT — 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 | 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.) |
Bảo phân biệt quan trọng
- 320-segment capacity with 1:8 multiplex in single TSSOP-56 chip (vsPCF8576DT/2,118)
- AEC-Q100 automotive-grade option in same footprint (vsPCF8545BTT (non-automotive))
- On-chip charge pump eliminates external boost components (vsDiscrete segment driver with external boost)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
