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NXP Semiconductors SA5778D/CE1804,512
- Part No.:
- SA5778D/CE1804,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SA5778D/CE1804,512.pdf
- Description:
- IC SERIAL TRPL GAUGE DRVR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
SA5778D/CE1804,512 from Philips Semiconductors is a Serial Triple Gauge Driver (STGD) IC designed for automotive instrument clusters. It drives one 360° major gauge (e.g., speedometer or tachometer) and two 112° minor gauges (e.g., fuel or temperature) with 10-bit resolution, ±0.5° major gauge accuracy, and ±1.0° minor gauge accuracy. It interfaces via SPI-compatible serial protocol and includes overvoltage (up to 40 V), overtemperature, and low-standby-current protection.
For engineers reviewing the SA5778D/CE1804,512 datasheet, SA5778D/CE1804,512 pinout, SA5778D/CE1804,512 application, or SA5778D/CE1804,512 equivalent, this page delivers verified functional architecture, thermal SO-28 package details, gauge-specific drive voltage ratios (71% of SwBATT for major, 74% for minor), status reporting via open-drain ST pin, and compatibility with Philips SGD SA5775A and DGD SA5777A in daisy-chained configurations.
Technical Context
The SA5778D/CE1804,512 implements a dedicated air-core meter driver architecture with three independent DAC-based output stages: a 10-bit Sine/Cosine DAC pair for full 360° major gauge operation and two 9-bit (10-bit loaded) DACs for 112° minor gauges. Its internal block includes a 4-bit status latch, 9-bit and 10-bit data latches, bias reference MUX, and thermally protected output buffers.
It supports serial daisy-chaining via DATAIN/DATAOUT with common CS/SCLK, enabling multi-gauge systems up to five gauges using SA5775A/SA5777A extensions. Fault reporting occurs via both serial status bits (bit 0–3) and active-low open-drain ST pin, which aggregates thermal shutdown, overcurrent, and RUN/GOE state faults - but excludes overvoltage events per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Major Gauge Resolution | 10-bit → 0.35° step resolution across full 360° range |
| Minor Gauge Accuracy | ±1.0° typical over entire 112° range, critical for fuel/temp needle stability |
| Overvoltage Shutdown | Triggers at 18–23 V VBATT → disables gauge drivers and SwBATT outputs to protect downstream coils |
| Serial Clock Frequency | 1.6 MHz max → supports real-time gauge updates at >100 Hz refresh rates |
| Thermal Package | SO-28 thermally enhanced → 8 ground pins act as heat spreaders; θJA optimized for PCB copper foil thermal management |
| Standby Current | 60 µA at 12 V → enables low-power ignition-off instrument cluster retention |
| SwBATT Drive Capability | 400 mA total (SwBATT1 + SwBATT2) → powers external SGD/DGD devices with overvoltage protection |
Pinout & Package
Package: Thermally enhanced SO-28 (SOT136-1) with eight dedicated GND pins (6,7,8,9,20,21,22,23) serving dual roles as circuit ground and thermal heat spreaders to PCB copper foil.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN+, SIN−, COS+, COS− | Major gauge coil differential outputs | Drive 360° air-core movement with Sine/Cosine approximation; 71% SwBATT swing amplitude |
| C1+, C1−, C2+, C2− | Minor gauge coil differential outputs | Drive two independent 112° gauges; each uses one DAC-driven coil + fixed-bias coil referenced to COM |
| COM | Minor gauge bias reference | Regulated to 0.5 × SwBATT → stabilizes bias voltage across temperature and load variations |
| SwBATT1, SwBATT2 | Switched battery supply inputs | Independent inputs powering major gauge buffers (SwBATT1) and minor gauge circuits/COM (SwBATT2); must be externally tied to same PNP collector |
| GOE, RUN | Control logic inputs | GOE enables gauge outputs; RUN senses ignition state - together they define standby/startup/normal modes per Table 1 |
| DATAIN, DATAOUT, SCLK, CS | Serial interface signals | SPI-compatible 4-wire interface; DATAOUT enables daisy-chain status/data forwarding; CS edge-triggered latching |
| ST | Status output | Open-drain active-low fault indicator (thermal, overcurrent, GOE/RUN state); wire-OR'able across multiple STGDs |
| SwCONTROL | External PNP gate control | Drives base of external PNP transistor to enable/disable SwBATT supplies; VOL2 ≤ 1.5 V @ 50 mA ensures saturation |
Key Features
| Feature | Design Value |
|---|---|
| Triple-gauge integration | Single-chip solution eliminates discrete driver arrays and reduces BOM count by ≥3 ICs in 3-gauge clusters |
| 10-bit major gauge DAC | Enables 0.35° mechanical resolution - sufficient for analog speedometer fidelity without interpolation |
| Daisy-chain serial interface | Allows cascading of SA5778D/CE1804,512 with SA5775A/SA5777A using shared CS/SCLK - no additional MCU GPIOs required |
| Protected SwBATT outputs | Delivers regulated, overvoltage-protected power to external gauge drivers - eliminates need for separate TVS + LDO on board |
| Zero-jump startup control | Sequenced activation (RUN high → minor gauges zeroed → GOE high → major enabled) prevents needle twitch during ignition-on transition |
Applications
| Speedometer System | Fuel Level Indicator |
|---|---|
Use Scenario: Real-time vehicle speed display using magnetic pickup sensor input processed by microcontroller and sent to gauge driver. IC Role / Device Role / Timing Role: SA5778D/CE1804,512 receives serialized speed data, converts to Sine/Cosine coil currents, and drives 360° air-core movement with <0.5° angular error. Use Value: Eliminates analog integrator circuits and discrete H-bridge drivers while maintaining OEM-grade needle smoothness and linearity. | Use Scenario: Analog fuel level display driven by resistive sender unit, conditioned and scaled by MCU before serial transmission. IC Role / Device Role / Timing Role: SA5778D/CE1804,512 accepts 10-bit fuel value, drives single-coil 112° minor gauge with 0.5° typical accuracy and COM-referenced bias. Use Value: Enables direct replacement of electromechanical fuel senders with digital calibration, reducing sensitivity to wiring resistance drift. |
| Engine Temperature Gauge | Automotive Cluster with Extended Gauges |
Use Scenario: Coolant temperature monitoring using NTC thermistor, digitized and linearized by MCU for analog needle presentation. IC Role / Device Role / Timing Role: SA5778D/CE1804,512 drives second 112° minor gauge with identical timing and accuracy specs as fuel gauge, sharing same serial bus. Use Value: Dual minor gauge support allows consolidated thermal/fuel subsystems on single IC - cuts PCB area and interconnect complexity. | Use Scenario: Five-gauge instrument cluster requiring speed, tach, fuel, temp, and oil pressure - exceeding SA5778D/CE1804,512's triple capacity. IC Role / Device Role / Timing Role: SA5778D/CE1804,512 serves as primary triple driver; its DATAOUT feeds DATAIN of SA5777A dual driver in daisy-chain mode under common CS/SCLK. Use Value: Leverages native protocol compatibility to scale beyond three gauges without MCU firmware changes or additional clock lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial air-core gauge driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SA5777A | Dual gauge driver only; lacks major gauge Sine/Cosine DAC and COM output; no SwBATT protection circuitry | Cannot replace SA5778D/CE1804,512 in 3-gauge systems alone; requires pairing with SA5775A for triple functionality | Select when building modular clusters where gauge count varies per vehicle trim; use SA5778D/CE1804,512 for cost-optimized fixed 3-gauge designs |
| SA5775A | Single gauge driver; supports only 360° major gauge; no minor gauge outputs or SwBATT control | Requires three SA5775A units plus external logic to match SA5778D/CE1804,512's integration level; higher layout area and power loss | Choose for repair scenarios or legacy designs where SA5778D/CE1804,512 is unavailable; not recommended for new 3-gauge implementations |
Compared with SA5777A and SA5775A, the SA5778D/CE1804,512 uniquely integrates triple-gauge drive, SwBATT protection, and daisy-chain capability in one SO-28 package - reducing component count by 2–4 ICs and eliminating external protection diodes and bias regulators required by alternatives.
Availability
SA5778D/CE1804,512 is available at Aetrix Electronics and suitable for automotive instrument clusters, OEM dashboard modules, and aftermarket gauge retrofit kits requiring stable component supply across extended temperature ranges (–40°C to +105°C).
Supply support for SA5778D/CE1804,512 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Philips Semiconductors (now NXP Semiconductors) is a pioneer in automotive analog ICs, delivering high-reliability mixed-signal solutions for vehicle instrumentation and body electronics since the 1980s.
The SA5778D/CE1804,512 belongs to Philips' Serial Gauge Driver family, engineered specifically for air-core meter applications in automotive dashboards - emphasizing precision angular drive, fault resilience, and seamless integration with 80C51-class microcontrollers.
FAQ
What is the maximum operating voltage for SA5778D/CE1804,512 before overvoltage shutdown activates?
The SA5778D/CE1804,512 triggers overvoltage shutdown when VBATT reaches 18–23 V, disabling gauge drivers and SwBATT outputs to protect connected coils. Absolute maximum rating allows transient exposure up to 40 V with series 1 kΩ resistor, but sustained operation above 16 V risks thermal shutdown at high ambient temperatures.
How does SA5778D/CE1804,512 handle startup to prevent needle jump in minor gauges?
The SA5778D/CE1804,512 sequences startup using RUN and GOE inputs: when RUN goes high (ignition on) with GOE low, it first drives minor gauges to zero position, enables the 5 V logic regulator, and turns on SwBATT - only then does GOE high enable major gauge outputs. This prevents uncontrolled needle movement during power-up.
Can SA5778D/CE1804,512 drive gauges with different coil resistances simultaneously?
Yes - the SA5778D/CE1804,512 supports variable coil loads: RLMIN is 127 Ω at –40°C, 171 Ω at 25°C, and 226 Ω at 105°C. Its DAC output voltage is expressed as a percentage of SwBATT (71% for major, 74% for minor), making drive current inherently adaptive to resistance changes across temperature.
Is SA5778D/CE1804,512 compatible with modern microcontrollers beyond legacy 80C51?
Yes - the SA5778D/CE1804,512 uses standard SPI-compatible timing (1.6 MHz max clock, 75 ns setup/hold) and level-compatible I/O (VIH = 3.5 V, VIL = 1.5 V). It operates with 5 V logic and interfaces seamlessly with ARM Cortex-M, PIC, and ESP32 microcontrollers using GPIO bit-banged or hardware SPI peripherals.
What fault conditions are reported on the ST pin of SA5778D/CE1804,512?
The ST pin of SA5778D/CE1804,512 reports thermal shutdown, major/minor gauge overcurrent, and RUN/GOE control state faults as an active-low open-drain signal. Overvoltage events are *not* reflected on ST - they disable outputs silently per design, requiring serial status register polling to detect.
SA5778D/CE1804,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Current - Supply:
- 500µA
- Voltage - Supply:
- 8V ~ 16V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SO
SA5778D/CE1804,512 FAQ
1.How can I place an order for SA5778D/CE1804,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5778D/CE1804,512 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SA5778D/CE1804,512 reliable?
The price and inventory of SA5778D/CE1804,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA5778D/CE1804,512 is usually 5 days.
3.What payment methods are accepted for SA5778D/CE1804,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5778D/CE1804,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA5778D/CE1804,512?
SA5778D/CE1804,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5778D/CE1804,512 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SA5778D/CE1804,512?
For technical support, including SA5778D/CE1804,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5778D/CE1804,512 requirements.
6.How does Aetrix verify that SA5778D/CE1804,512 is sourced from the original manufacturer or authorized distributors?
All SA5778D/CE1804,512 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SA5778D/CE1804,512 meets industry standards.
7.What is the process for return or replacement of SA5778D/CE1804,512?
All SA5778D/CE1804,512 units undergo pre-shipment inspection (PSI). If there is an issue with SA5778D/CE1804,512, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SA5778D/CE1804,512 part is unused and in its original packaging.
Return procedure for SA5778D/CE1804,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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