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NXP Semiconductors SA5778D,518
- Part No.:
- SA5778D,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SA5778D,518.pdf
- Description:
- IC SERIAL TRPL GAUGE DRVR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,872
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Product details
Overview
SA5778D,518 from NXP Semiconductors (formerly Philips) 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 and 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,518 datasheet, SA5778D,518 pinout, SA5778D,518 application, or SA5778D,518 equivalent, key selection criteria include its thermally enhanced SO-28 package, dual switched-battery outputs (SwBATT1/SwBATT2), open-drain status output (ST), compatibility with SA5775A/SA5777A gauge drivers, and support for J1850 VPW-based microcontroller systems in automotive dashboards.
Technical Context
The SA5778D,518 integrates three independent air-core gauge drivers: a 10-bit Sine/Cosine DAC-based major gauge channel with quadrant multiplexing and two 9-bit (10-bit loaded) minor gauge channels using fixed-bias coil architecture. Its serial interface uses MSB-first SPI timing with 1.6 MHz max clock frequency, chip-select–triggered data latching, and status shift-out on CS rising edge.
Internal protection logic disables all gauge outputs during VBATT > 23 V (OVSD threshold), die temperature > +150°C, or GOE/RUN control violations. SwCONTROL drives an external PNP transistor to regulate SwBATT1/SwBATT2 - separate supplies for major and minor gauge circuitry - enabling protected power delivery to co-located SGD or DGD devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Major Gauge Resolution | 10-bit → 0.35° step size across full 360° range |
| Minor Gauge Accuracy | ±1.0° typical over 112° range - critical for fuel/temp needle stability |
| Overvoltage Shutdown | Triggers at 18–23 V VBATT - protects against alternator regulator failure |
| Operating Temperature | –40°C to +105°C ambient - qualified for under-hood automotive environments |
| Serial Clock Frequency | Up to 1.6 MHz - enables fast gauge updates without MCU overhead |
| Standby Current | 60 µA at 12 V - minimizes battery drain during ignition-off periods |
| Package Thermal Rating | θJA per thermal management section - requires PCB copper pour on GND pins for 1400 mW dissipation |
Pinout & Package
SA5778D,518 is housed in a thermally enhanced SO-28 surface-mount package (SOT136-1) with eight dedicated GND pins (6,7,8,9,20,21,22,23) serving as heat spreaders soldered directly to PCB copper foil.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SIN+, SIN–, COS+, COS– | Major gauge Sine/Cosine coil drive outputs | Differential 360° drive signals with 68–78% SwBATT swing - enable precise analog needle positioning |
| C1+, C1–, C2+, C2– | Minor gauge coil drive outputs | Single-ended 112° drive with 70–80% SwBATT swing - paired with COM bias reference |
| COM | Minor gauge bias common node | Regulated to 0.475–0.525 × SwBATT - stabilizes fixed-bias coil voltage for zero-point repeatability |
| SwBATT1, SwBATT2 | Switched battery supply inputs | Independent inputs for major/minor gauge circuitry - must be externally tied to same PNP collector; not internally connected |
| SwCONTROL | External PNP base driver | Open-collector output controlling SwBATT regulation - sinks up to 50 mA at VBATTMAX |
| ST | Fault status indicator | Open-drain active-low output - wire-OR'able across multiple STGDs to signal thermal/OV/GOE faults |
| DATAIN / DATAOUT / SCLK / CS | SPI-compatible serial interface | MSB-first, CS-edge–latched communication - supports daisy-chained STGD/SGD/DGD configurations |
| GOE / RUN | System control inputs | GOE enables gauge outputs; RUN senses ignition state - together define standby/startup/normal modes per Table 1 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-gauge integration | Single-chip replacement for discrete SGD+DGD combinations - reduces BOM count and layout area in cluster PCBs |
| Protected SwBATT outputs | Enables safe powering of external SA5775A/SA5777A drivers - eliminates need for separate overvoltage protection circuitry |
| Startup sequence control | Prevents needle jump on minor gauges by sequencing SwBATT enable before major gauge DAC activation - ensures repeatable zero position |
| Thermal shutdown reporting | Status register bits indicate thermal fault independently from OV or short-circuit events - enables diagnostic logging in ECU firmware |
| Automotive-grade reliability | Qualified to –40°C to +105°C with 40 V absolute max VBATT - meets AEC-Q100 stress test requirements for dashboard ICs |
Applications
| Speedometer System | Fuel & Temperature Cluster |
|---|---|
Use Scenario: Digital speed signal from ABS/VSS converted to analog needle movement in OEM instrument panel. IC Role / Device Role / Timing Role: SA5778D,518 receives calibrated speed data via SPI, drives 360° sine/cosine coils of speedometer gauge with <±0.5° linearity. Use Value: Eliminates need for external DACs and op-amps; leverages built-in quadrant multiplexing for smooth 0–240 km/h sweep. | Use Scenario: Simultaneous display of fuel level and engine coolant temperature using compact air-core meters. IC Role / Device Role / Timing Role: SA5778D,518 drives two independent 112° minor gauges (G2/G3) using shared SwBATT2 and COM reference. Use Value: Enables dual-minor-gauge operation from single IC - reduces component count vs. dual SGD solution and avoids cross-talk between bias supplies. |
| Multi-Gauge Dashboard | Protected Gauge Expansion |
Use Scenario: 5-gauge cluster (speed + tach + fuel + temp + oil pressure) requiring coordinated needle control. IC Role / Device Role / Timing Role: SA5778D,518 acts as master STGD, cascading DATAOUT to SA5777A DGD via shared SCLK/CS lines per Figure 4. Use Value: Serial daisy-chaining supports >3 gauges without additional MCU GPIOs - simplifies routing and maintains timing coherence across all drivers. | Use Scenario: Adding auxiliary gauges (e.g., voltmeter, oil pressure) while maintaining robustness against load dump transients. IC Role / Device Role / Timing Role: SA5778D,518 supplies regulated SwBATT to external SA5775A SGD via SwBATT1, with overvoltage cutoff protecting downstream device. Use Value: Integrates transient protection for expansion modules - avoids discrete TVS diodes and voltage regulators on auxiliary gauge PCBs. |
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; no major gauge Sine/Cosine DAC; lacks SwCONTROL and SwBATT outputs | Supports only two 112° gauges - insufficient for speedometer + two minors | Select SA5777A only when system requires exactly two minor gauges and uses separate major gauge driver |
| SA5775A | Single gauge driver; 10-bit resolution but limited to 112° range; no COM or SwBATT capability | Cannot drive 360° major gauge or provide bias voltage for minor gauges | Choose SA5775A for simple single-gauge add-ons where full STGD functionality is unnecessary |
Compared with SA5777A and SA5775A, the SA5778D,518 uniquely integrates triple-gauge drive, protected SwBATT distribution, and startup sequencing - making it the sole option for compact, self-protected 3-gauge clusters without external supervision logic.
Availability
SA5778D,518 is available at Aetrix Electronics and suitable for automotive instrument clusters, EV dashboard subsystems, and commercial vehicle telematics requiring stable component supply, long-lifecycle support, and AEC-compliant timing accuracy.
Supply support for SA5778D,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
NXP Semiconductors is a global semiconductor leader focused on automotive, industrial, and IoT applications, with deep heritage in automotive analog and mixed-signal ICs dating to Philips Semiconductor.
The SA5778D,518 belongs to NXP's legacy automotive gauge driver product line, engineered specifically for high-reliability analog needle control in digital instrument clusters - emphasizing thermal resilience, fault reporting, and seamless integration with 80C51-class microcontrollers.
FAQ
What is the maximum operating voltage for SA5778D,518 before overvoltage shutdown activates?
The SA5778D,518 enters overvoltage shutdown when VBATT exceeds 18 V to 23 V (typical 20.5 V), disabling gauge outputs and SwBATT supplies. This protects against alternator regulator failure while allowing transient tolerance up to 40 V absolute maximum rating - ensuring survival during load-dump events without latch-up.
How does SA5778D,518 prevent needle jump during power-up in minor gauges?
The SA5778D,518 prevents needle jump by sequencing SwBATT enable *before* activating minor gauge DAC outputs. During startup (RUN=high, GOE=low), SwBATT powers bias coils first, then the microcontroller loads zero-position data via serial interface before asserting GOE - ensuring stable zero alignment without mechanical overshoot.
Can SA5778D,518 drive a 360° gauge and two 112° gauges simultaneously?
Yes, the SA5778D,518 is explicitly designed to drive one 360° major gauge (via SIN+/SIN–/COS+/COS–) and two 112° minor gauges (via C1±/C2± with COM bias) concurrently. All three gauge channels operate independently with dedicated DACs and output buffers - verified in functional description and Figure 5 of the datasheet.
What is the purpose of the ST pin on SA5778D,518, and how is it used in system design?
The ST pin on SA5778D,518 is an open-drain active-low fault indicator reflecting thermal shutdown, major/minor gauge overcurrent, or RUN/GOE control violation. Multiple ST pins can be wire-OR'ed to a single MCU interrupt line, enabling centralized fault detection across daisy-chained STGD/SGD/DGD systems without polling overhead.
Is SA5778D,518 pin-compatible with SA5775A or SA5777A for drop-in replacement?
No, SA5778D,518 is not pin-compatible with SA5775A or SA5777A. It uses a 28-pin SO package with unique pin assignments (e.g., SwCONTROL, SwBATT1/2, COM), whereas SA5775A (SO-16) and SA5777A (SO-20) have different pin counts and functions. Board redesign is required for substitution - refer to respective pin configuration diagrams.
SA5778D,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,518 FAQ
1.How can I place an order for SA5778D,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5778D,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,518 reliable?
The price and inventory of SA5778D,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,518 is usually 5 days.
3.What payment methods are accepted for SA5778D,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5778D,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA5778D,518?
SA5778D,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5778D,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,518?
For technical support, including SA5778D,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5778D,518 requirements.
6.How does Aetrix verify that SA5778D,518 is sourced from the original manufacturer or authorized distributors?
All SA5778D,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,518 meets industry standards.
7.What is the process for return or replacement of SA5778D,518?
All SA5778D,518 units undergo pre-shipment inspection (PSI). If there is an issue with SA5778D,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,518 part is unused and in its original packaging.
Return procedure for SA5778D,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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