PCF85176T/1 - 40x4 LCD Segment Driver I2C TSSOP-56 | NXP
MPN: PCF85176T/1 ✓ פעילPCF85176T/1 סקירה
A segment driver (LCD driver) is a peripheral device that translates digital commands from a microcontroller into the multi-level AC waveforms required to drive a passive-matrix liquid crystal display. LCD segment drivers sit in the display driver hierarchy above simple character LCD modules, providing designers with a low-pin-count way to control custom glass through bias generation, backplane sequencing, and segment latching. The PCF85176T/1 combines on-chip bias generation with a serial I2C interface so an MCU only needs two I/O lines to address 160 individual pixel segments.
Key features include 40 segment outputs plus 4 backplane outputs (160 pixel capability), integrated charge-pump-based LCD bias voltage generator, selectable bias modes for static, 2-way, 3-way, and 4-way multiplexing, an I2C-bus interface with hardware-selectable slave addresses for cascading, on-chip oscillator requiring no external components, and a wide logic supply range compatible with 3.3 V and 5 V microcontrollers. The CMOS process and TSSOP-56 footprint keep the part economical for mid-volume industrial and consumer LCD designs.
The architecture consists of an I2C slave controller, a display RAM of 80 bits (40 segments x 2 pages), a programmable frame frequency generator, and a segment/backplane driver block tolerant of liquid crystal threshold voltages typically between 3 V and 9 V. The integrated VLCD generator eliminates the need for an external DC-DC converter in many designs, reducing BOM cost and PCB area.
Typical applications include point-of-sale (POS) terminals, industrial control panels with character or numeric LCDs, white-goods user interfaces such as washing machines and microwave ovens, automotive instrument cluster sub-displays, medical instrument readouts, and metering equipment (water/gas/electricity meters). Cascading multiple PCF85176T/1 devices enables larger glass panels, supporting display sizes up to 320 segments in a chain.
When designing with this part, use the on-chip bias generator to produce VLCD rather than an external rail, and reserve one I2C address bit per cascaded chip. Designers should also enable the internal oscillator unless precise frame frequency synchronization is required by the application.
חלופות תחליף ישיר עבור PCF85176T/1 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
PCF85176T/1,118
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF85176T/1Y
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PCF8576CTG
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
PCF8576DT
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
PCF85176T/1 מפרטים
| Device Type | LCD Segment Driver |
| Display Configuration | 4 backplanes x 40 segments (160 pixels) |
| Technology | CMOS |
| מתח אספקה | 5 V (typical, also supports lower VDD) |
| טמפרטורת פעולה | -40 C to +85 C |
| מארז | TSSOP-56 |
| סוג הרכבה | Surface Mount |
| ממשק | I2C-bus (2-wire serial) |
| Frame Frequency | 82 Hz (typical) |
| Multiplex Rate | 1:1 (static) to 1:4 (low multiplex) |
| Bias Modes | Static, 1/2, 1/3 bias selectable |
| VLCD Generator | On-chip charge pump |
| Cascading | Yes, hardware-selectable slave addresses |
| Display RAM | 80 bits (40 segments x 2 banks/pages) |
| סטטוס RoHS | Compliant |
תצורת פינים של PCF85176T/1
| פין 1 | SDA — I2C-bus serial data |
| פין 2 | SCL — I2C-bus serial clock |
| פין 3 | SYNC — Cascade synchronization input/output |
| פין 4 | CLK — External clock input (when internal oscillator bypassed) |
| פין 5 | VDD — Logic supply voltage |
| פין 6 | VSS — Ground |
| פין 7 | VLCD — LCD supply voltage (generated by internal charge pump) |
| פין 8 | A0 — I2C slave address bit 0 |
| פין 9 | A1 — I2C slave address bit 1 |
| פין 10 | A2 — I2C slave address bit 2 |
| פין 11 | OSC — Oscillator select / test pin |
| פין 12 | BP0 — Backplane output 0 |
| פין 13 | BP1 — Backplane output 1 |
| פין 14 | BP2 — Backplane output 2 |
| פין 15 | BP3 — Backplane output 3 |
| פין 16 | S0 — Segment output 0 |
| פין 17 | S1 — Segment output 1 |
| פין 18 | S2 — Segment output 2 |
| פין 19 | S3 — Segment output 3 |
| פין 20 | S4 — Segment output 4 |
| פין 21 | S5 — Segment output 5 |
| פין 22 | S6 — Segment output 6 |
| פין 23 | S7 — Segment output 7 |
| פין 24 | S8 — Segment output 8 |
| פין 25 | S9 — Segment output 9 |
| פין 26 | S10 — Segment output 10 |
| פין 27 | S11 — Segment output 11 |
| פין 28 | S12 — Segment output 12 |
| פין 29 | S13 — Segment output 13 |
| פין 30 | S14 — Segment output 14 |
| פין 31 | S15 — Segment output 15 |
| פין 32 | S16 — Segment output 16 |
| פין 33 | S17 — Segment output 17 |
| פין 34 | S18 — Segment output 18 |
| פין 35 | S19 — Segment output 19 |
| פין 36 | S20 — Segment output 20 |
| פין 37 | S21 — Segment output 21 |
| פין 38 | S22 — Segment output 22 |
| פין 39 | S23 — Segment output 23 |
| פין 40 | S24 — Segment output 24 |
| פין 41 | S25 — Segment output 25 |
| פין 42 | S26 — Segment output 26 |
| פין 43 | S27 — Segment output 27 |
| פין 44 | S28 — Segment output 28 |
| פין 45 | S29 — Segment output 29 |
| פין 46 | S30 — Segment output 30 |
| פין 47 | S31 — Segment output 31 |
| פין 48 | S32 — Segment output 32 |
| פין 49 | S33 — Segment output 33 |
| פין 50 | S34 — Segment output 34 |
| פין 51 | S35 — Segment output 35 |
| פין 52 | S36 — Segment output 36 |
| פין 53 | S37 — Segment output 37 |
| פין 54 | S38 — Segment output 38 |
| פין 55 | S39 — Segment output 39 |
| פין 56 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
PCF85176T/1 מתאים עבור 6 יישוםs: Point-of-Sale (POS) Terminal Displays, Industrial Control Panels, White-Goods User Interfaces, Automotive Secondary Instrument Displays, Medical Instrument Readouts, Utility Meter Displays.
Point-of-Sale (POS) Terminal Displays
The NXP PCF85176T/1 is well suited to POS terminal displays that need a custom 7-segment plus annunciator layout on a small LCD glass. With 4 backplanes and 40 segments the driver provides 160 pixels, enough for amount, currency, item count, and status icons on a single chip. Its integrated VLCD charge pump removes the need for an external DC-DC bias supply, cutting BOM cost in space-constrained terminal enclosures. The I2C interface connects directly to the POS host MCU or secure processor with only two pins, and cascading two PCF85176 devices with hardware-set addresses drives 320 pixels for larger multi-line displays.
מומלץ
Industrial Control Panels
Industrial control panels benefit from the PCF85176T/1's wide -40 C to +85 C operating range and noise-tolerant I2C interface. Its 82 Hz frame frequency avoids flicker under fluorescent lighting, while the integrated bias generator simplifies intrinsically-safe or sealed-panel designs where external bias components would be hard to qualify. The TSSOP-56 surface-mount package is suitable for wave-soldered or reflow-soldered industrial boards. Designers can use cascaded PCF85176 devices to drive 20-segment multi-digit process-variable readouts without exceeding MCU pin budget.
מומלץ
White-Goods User Interfaces
Washing machines, microwave ovens, dishwashers, and other white goods typically use custom segment LCDs for time, temperature, and program readouts. The PCF85176T/1 fits these designs because its on-chip VLCD generator produces the negative bias needed for conventional TN glass directly from the 5 V logic rail, eliminating one DC-DC stage and reducing BOM cost by tens of cents in cost-sensitive consumer appliances. The TSSOP-56 package is robust to standard reflow profiles, and the 160-pixel capacity covers most 4-digit plus-icon layouts used in mid-range appliance UI panels.
מומלץ
Automotive Secondary Instrument Displays
In automotive instrument clusters, the PCF85176T/1 serves as a sub-display driver for trip computer, climate, or audio status segments where the main TFT is overkill. Its 5 V tolerant I/O and industrial temperature range handle under-dash environments, while the I2C bus keeps wiring simple between the head unit and a remote display PCB. The PCF85176T/1Y packing variant (DigiKey PN 15221938) is supplied to NXP's automotive-grade production lines for OEM secondary display modules.
מומלץ
Medical Instrument Readouts
Portable medical devices such as blood-pressure monitors, glucose meters, and infusion pumps often use compact segment LCDs that draw essentially zero current from the display (since the LCD is a passive load). The PCF85176T/1 leverages this by offering a low quiescent current and an integrated charge pump, extending battery life in compliance-critical medical designs. The TSSOP-56 footprint supports high-density medical PCBs, and the I2C interface lets a low-power MCU like an MSP430 manage the LCD without occupying many GPIO pins.
מומלץ
Utility Meter Displays
Electricity, water, and gas meters use segment LCDs to display consumption and status, where the PCF85176T/1's CMOS process and on-chip VLCD generator shine. Because meters run from a single lithium primary cell or harvested energy, the PCF85176T/1's low quiescent current and I2C polled-or-interrupt interface fit ultra-low-power budgets. Multi-meter installations can cascade two or more PCF85176 chips on the same I2C bus to drive both the consumption readout and the tariff/credit display independently.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PCF85176T/1 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PCF85176T/1,118 | PCF85176T/1Y | PCF8576CTG | PCF8576DT |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Package | TSSOP-56 | TSSOP-56 - same | TSSOP-56 - same | TSSOP-56 (VSO) - same footprint | TSSOP-56 - same |
| Display Configuration | 4 backplanes x 40 segments (160 pixels) | 4 x 40 - same | 4 x 40 - same | 4 x 40 - same | 4 x 40 - same |
| Interface | I2C-bus | I2C-bus - same | I2C-bus - same | I2C-bus - same | I2C-bus - same |
| Frame Frequency | 82 Hz | 82 Hz - same | 82 Hz - same | 64 Hz typical | 64 Hz typical |
| VLCD Generator | On-chip charge pump (VLCD-VSS bias) | On-chip (same) | On-chip (same) | External VLCD required (VLCD-VDD bias) | External VLCD required (VLCD-VDD bias) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same |
| Approx. Unit Price (1 pc) | $1.85 | $1.85 - same | $1.95 (DigiKey 15221938) | $2.10 | $1.95 |
מבדילים עיקריים
- Higher 82 Hz frame frequency avoids flicker in fluorescent-lit industrial environments (לעומתPCF8576CTG)
- Integrated VLCD charge pump eliminates external DC-DC bias components (לעומתPCF8576DT)
- Industrial-grade -40 C to +85 C operating range with cascade support (לעומתPCF8576CTG)
הערות תכנון
The PCF85176T/1 integrates an on-chip charge pump to generate VLCD from the 5V VDD supply, so no external DC-DC bias circuit is required. For stable operation, place a 1uF decoupling capacitor close to VDD (pin 5) and a 1uF reservoir capacitor on VLCD (pin 7) within 5 mm of the package. If the application uses an external VLCD rail instead, leave the charge pump unused and feed VLCD directly; do not exceed the absolute maximum VLCD rating given in the NXP datasheet Rev. 5.1.
Keep the I2C SDA/SCL traces short and route them away from the segment output traces to avoid crosstalk into the display logic. Standard-mode (100 kHz) and Fast-mode (400 kHz) are both supported per the NXP datasheet; pull-ups of 4.7 kohm to VDD are typical for a single device on the bus. For cascaded chains, lower pull-up values (2.2-3.3 kohm) may be needed to maintain rise-time budgets across multiple PCF85176 slave devices.
Do not confuse PCF85176 with the older PCF8576 family: the PCF85176's bias topology references VLCD to VSS, while the PCF8576 references VLCD to VDD. Cross-replacing these on the same PCB without reworking the bias caps will produce a blank or flicker-laden display. Also verify the I2C slave-address jumper pins (A0/A1/A2) match your firmware's expected addresses, since each cascaded chip must have a unique address on the bus.
מידע על תאימות
RoHS and REACH compliant per NXP product page; lead-free / halogen-free packaging. Not AEC-Q100 qualified - for AEC-Q100 automotive applications use the PCF85176T/1Y packing variant or contact NXP for the auto-grade die revision.
