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NXP Semiconductors SA5778D/CE1804,518
- Part No.:
- SA5778D/CE1804,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SA5778D/CE1804,518.pdf
- Description:
- IC SERIAL TRPL GAUGE DRVR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,081
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Product details
Overview
SA5778D/CE1804,518 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) and two 112° minor gauges (e.g., fuel, temperature) with 10-bit resolution, ±0.5° major gauge accuracy, and ±1.0° minor gauge accuracy. It interfaces via SPI-compatible serial protocol (SCLK, DATAIN, CS), supports daisy-chained configuration, and includes overvoltage (18–23 V shutdown), overtemperature, and low-standby-current (60 µA) protection.
For engineers reviewing the SA5778D/CE1804,518 datasheet, SA5778D/CE1804,518 pinout, SA5778D/CE1804,518 application, or SA5778D/CE1804,518 equivalent, key selection considerations include its thermally enhanced SO-28 package, dual switched battery outputs (SwBATT1/SwBATT2), sine/cosine major gauge drive, COM bias regulation, and compatibility with Philips SGD SA5775A and DGD SA5777A in multi-gauge systems.
Technical Context
The SA5778D/CE1804,518 integrates three independent air-core gauge drivers: a 10-bit Sine/Cosine DAC-based major gauge channel with quadrant multiplexing and polarity control, plus two 9-bit (10-bit shifted) minor gauge channels each using a 7-bit tan DAC and external bias coils. Its serial interface uses MSB-first shifting with active-high CS latch timing and supports status feedback via open-drain ST and serial DATAOUT.
Internal protection logic disables gauge outputs during VBATT >23 V (overvoltage), die temperature >150°C (thermal shutdown), or when GOE/RUN are both low (standby). SwCONTROL drives an external PNP transistor to regulate SwBATT1/SwBATT2 - separate supplies for major and minor gauge circuitry - with automatic disable during fault or standby conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit for all three gauges; enables 0.35° angular step size across full range. |
| Major Gauge Accuracy | ±0.5° typical over full 360° range; ensures precise speedometer or tachometer needle positioning. |
| Minor Gauge Accuracy | ±1.0° typical over 112° range; sufficient for fuel and temperature display fidelity. |
| Overvoltage Shutdown | Triggers at 18–23 V VBATT; disables output buffers and SwBATT to protect gauges and downstream drivers. |
| Standby Current | 60 µA at 12 V VBATT; minimizes battery drain when ignition is off but system remains powered. |
| Serial Clock Frequency | Up to 1.6 MHz; supports fast gauge updates in real-time vehicle data acquisition. |
| Operating Temperature | –40°C to +105°C ambient; qualified for under-hood automotive environments. |
| Package Thermal Rating | 1400 mW max power dissipation at Tamb = 105°C in SO-28 thermally enhanced package. |
Pinout & Package
SA5778D/CE1804,518 is housed in a thermally enhanced SO-28 surface-mount package (SOT136-1), with eight ground pins (6,7,8,9,20,21,22,23) serving as heat spreaders soldered directly to PCB copper for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN+, SIN–, COS+, COS– | Major gauge coil drive outputs | Differential sine/cosine outputs for 360° air-core meter movement; enable precise angular positioning without mechanical stops. |
| C1+, C1–, C2+, C2– | Minor gauge coil drive outputs | Single-ended drive for two 112° gauges; each pair drives one coil while bias is supplied via COM and SwBATT. |
| COM | Minor gauge bias reference | Regulated output at 0.5 × SwBATT; stabilizes voltage applied to fixed bias coils of minor gauges. |
| SwBATT1, SwBATT2 | Switched battery supply inputs | Independent protected supplies: SwBATT1 powers major gauge DACs/buffers; SwBATT2 powers minor gauge DACs/COM regulator. |
| SwCONTROL | External PNP switch driver | Open-collector output controlling external PNP transistor to enable/disable SwBATT1/SwBATT2 based on RUN, GOE, and fault status. |
| GOE, RUN | Functional enable 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; supports daisy-chaining multiple STGDs, SGDs, or DGDs using shared CS/SCLK and cascaded DATA lines. |
| ST | Fault status indicator | Open-drain active-low output reflecting thermal shutdown, overcurrent, or GOE/RUN disable - wire-OR'able across multiple devices. |
Key Features
| Feature | Design Value |
|---|---|
| Triple gauge integration | Single-chip solution driving one 360° major and two 112° minor gauges eliminates discrete driver complexity and layout space. |
| Sine/Cosine major gauge drive | Enables true 360° continuous rotation with high linearity and no dead zones - critical for speedometer accuracy. |
| Dual independent SwBATT rails | Allows separate power domain control: SwBATT1 for major gauge precision, SwBATT2 for minor gauge bias stability and COM regulation. |
| Status feedback architecture | Combines serial DATAOUT and open-drain ST pin to support both detailed diagnostics and simple fault-flagging in resource-constrained microcontrollers. |
| Automotive-grade protection | Integrated overvoltage (to 40 V), overtemperature, and low-standby operation meet OEM requirements for reliability and battery conservation. |
Applications
| Speedometer System | Fuel & Temperature Cluster |
|---|---|
Use Scenario: Real-time vehicle speed indication using a 360° air-core meter movement driven by CAN/J1850-derived speed data. IC Role / Device Role / Timing Role: SA5778D/CE1804,518 receives serial speed data from microcontroller, computes sine/cosine coil voltages, and drives SIN+/COS– outputs with 0.35° resolution. Use Value: Eliminates need for external DACs, op-amps, and H-bridges - reduces BOM count by ≥7 components per gauge while maintaining ±0.5° accuracy. | Use Scenario: Dual analog gauge display for fuel level and engine coolant temperature in compact instrument panel. IC Role / Device Role / Timing Role: SA5778D/CE1804,518 accepts 10-bit scaled sensor data, drives C1+/C1– and C2+/C2– with 112° range, and regulates COM to 0.5×SwBATT for stable bias. Use Value: Enables simultaneous minor gauge actuation from single IC with matched thermal drift and supply rejection - improves inter-gauge consistency vs. discrete solutions. |
| Multi-Gauge Dashboard Expansion | Protected External Gauge Driver Supply |
Use Scenario: 5-gauge cluster (speedometer + tachometer + fuel + temp + oil pressure) requiring coordinated needle movement and fault reporting. IC Role / Device Role / Timing Role: SA5778D/CE1804,518 acts as master STGD in daisy-chain with SA5775A (SGD) and SA5777A (DGD); shares CS/SCLK, cascades DATAOUT→DATAIN. Use Value: Single microcontroller port controls all five gauges via one serial bus; ST pins wire-OR'ed to generate unified fault interrupt on any device failure. | Use Scenario: Powering additional Serial Gauge Drivers (SA5775A) or Dual Gauge Drivers (SA5777A) from same battery rail while protecting against alternator overvoltage transients. IC Role / Device Role / Timing Role: SA5778D/CE1804,518 generates SwBATT1/SwBATT2 from VBATT via SwCONTROL-driven PNP; shuts down during >23 V events. Use Value: Provides regulated, fault-protected 7.5–16 V supply to companion drivers - avoids need for separate TVS + LDO solutions and reduces system-level component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple gauge driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SA5778N/01,518 | Same die, plastic DIP-28 package; no thermal enhancement; higher θJA; not rated for 105°C ambient. | Limited to lower-power or non-under-hood applications; unsuitable for modern automotive dashboards with tight thermal envelopes. | Select SA5778D/CE1804,518 for SO-28 thermal performance and full –40°C to +105°C operation; choose SA5778N only for legacy through-hole prototyping. |
| SA5778DP,518 | Identical SO-28 package and specs; differs only in tape-and-reel packaging (no functional difference). | No application impact; identical electrical, thermal, and mechanical behavior in circuit. | SA5778D/CE1804,518 and SA5778DP,518 are functionally interchangeable; CE1804,518 denotes specific reel orientation or traceability marking per Philips internal logistics. |
Compared with SA5778N/01,518, the SA5778D/CE1804,518 delivers 40% lower junction temperature rise under load due to SO-28 thermal vias and ground-pad conduction, enabling reliable operation in high-ambient automotive environments; versus SA5778DP,518, it offers identical performance with differentiated logistics coding for production traceability.
Availability
SA5778D/CE1804,518 is available at Aetrix Electronics and suitable for automotive instrument clusters, EV dashboard subsystems, and industrial panel meters requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for SA5778D/CE1804,518 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 global semiconductor innovator with leadership in automotive, analog, and interface ICs.
The SA5778D/CE1804,518 belongs to Philips' Serial Gauge Driver family, engineered specifically for high-reliability automotive instrumentation - emphasizing integrated protection, thermal robustness, and seamless interoperability among SGD, DGD, and STGD variants.
FAQ
What is the primary function of the SA5778D/CE1804,518 in automotive systems?
The SA5778D/CE1804,518 is a dedicated Serial Triple Gauge Driver IC that controls one 360° major gauge (e.g., speedometer) and two 112° minor gauges (e.g., fuel, temperature) in automotive instrument clusters. It converts serial digital data from a microcontroller into precise analog coil drive signals, implements overvoltage and overtemperature protection, and supports daisy-chained configurations with other Philips gauge drivers like the SA5775A and SA5777A.
How does the SA5778D/CE1804,518 handle overvoltage conditions?
The SA5778D/CE1804,518 monitors VBATT and triggers overvoltage shutdown when input exceeds 18–23 V. During shutdown, it disables all gauge output buffers and turns off SwBATT1/SwBATT2 supplies via SwCONTROL, protecting connected air-core gauges and external drivers. The ST pin remains high (not asserted) during overvoltage events since this condition is treated as transient - fault reporting focuses on thermal and overcurrent conditions instead.
Can the SA5778D/CE1804,518 be used with non-Philips gauge drivers?
The SA5778D/CE1804,518 is optimized for interoperability with Philips' SA5775A (SGD) and SA5777A (DGD) via shared serial protocol, pinout conventions, and SwBATT protection architecture. While basic SPI-level communication may work with third-party drivers, guaranteed timing, status reporting, daisy-chain behavior, and SwBATT coordination require Philips-compliant devices - use only SA5775A or SA5777A for multi-gauge expansion.
What is the role of the COM pin on the SA5778D/CE1804,518?
The COM pin on the SA5778D/CE1804,518 provides a regulated bias reference voltage equal to 0.475× to 0.525× SwBATT for the fixed coils of minor gauges G2 and G3. It ensures stable magnetic field balance between driven and bias coils, minimizing needle offset and improving linearity. COM must be connected directly to the junction point of the two minor gauge bias coils and is not intended for external loading beyond specified current limits.
Does the SA5778D/CE1804,518 support daisy-chaining with other SA5778D/CE1804,518 devices?
Yes, the SA5778D/CE1804,518 supports daisy-chaining: its DATAOUT pin connects to the DATAIN of the next device, with shared SCLK and CS lines. Each SA5778D/CE1804,518 shifts out its 4-bit status register upon CS rising edge, allowing a microcontroller to read back status from all devices in sequence. This enables scalable multi-triple-gauge systems without additional GPIO or serial ports.
SA5778D/CE1804,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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/CE1804,518 FAQ
1.How can I place an order for SA5778D/CE1804,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5778D/CE1804,518 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/CE1804,518 reliable?
The price and inventory of SA5778D/CE1804,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA5778D/CE1804,518 is usually 5 days.
3.What payment methods are accepted for SA5778D/CE1804,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5778D/CE1804,518 transactions.
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4.How is shipping managed for SA5778D/CE1804,518?
SA5778D/CE1804,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5778D/CE1804,518 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/CE1804,518?
For technical support, including SA5778D/CE1804,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5778D/CE1804,518 requirements.
6.How does Aetrix verify that SA5778D/CE1804,518 is sourced from the original manufacturer or authorized distributors?
All SA5778D/CE1804,518 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/CE1804,518 meets industry standards.
7.What is the process for return or replacement of SA5778D/CE1804,518?
All SA5778D/CE1804,518 units undergo pre-shipment inspection (PSI). If there is an issue with SA5778D/CE1804,518, 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/CE1804,518 part is unused and in its original packaging.
Return procedure for SA5778D/CE1804,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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