My Inquiry
My Account
NXP Semiconductors SA5778D,512
- Part No.:
- SA5778D,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SA5778D,512.pdf
- Description:
- IC AIR-CORE DRIVER 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,116
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA5778D,512 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 operates from 8–16 V battery supply, supports serial microcontroller interface (SCLK/DATAIN/CS), and integrates overvoltage (18–23 V shutdown), overtemperature, and low-standby-current (60 µA) protection.
For engineers reviewing the SA5778D,512 datasheet, SA5778D,512 pinout, SA5778D,512 application, or SA5778D,512 equivalent, this page delivers verified technical context for air-core gauge driver selection in automotive dashboards - including serial daisy-chaining capability, SwBATT-controlled external SGD/DGD support, and fault reporting via open-drain ST pin or DATAOUT.
Technical Context
The SA5778D,512 implements a dedicated serial interface with MSB-first data shifting synchronized to SCLK (max 1.6 MHz), where CS rising edge latches status into shift register and falling edge loads gauge data into internal latches. Its architecture includes three independent DAC-driven output stages: a 10-bit sine/cosine DAC pair for the major gauge and two 9-bit (10-bit loaded) DACs for minor gauges, each with dedicated SwBATT1/SwBATT2 supplies and COM bias regulation at 0.5 × SwBATT.
Thermal and voltage protection is hardware-enforced: outputs disable when VBATT exceeds 18–23 V (VOVSD), die temperature exceeds +150/+160 °C, or GOE/RUN inputs enter standby state per Table 1. SwCONTROL provides active-low PNP transistor gate control to switch protected SwBATT supplies, enabling cascaded operation with SA5775A or SA5777A drivers without external overvoltage circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VBATT) | 8.0–16.0 V operating range; 40 V absolute max with series resistor - enables direct connection to automotive battery rail with integrated overvoltage shutdown. |
| Major Gauge Resolution & Accuracy | 10-bit (0.35° step), ±0.5° typical accuracy across full 360° - ensures precise needle positioning for speedometer/tachometer applications. |
| Minor Gauge Resolution & Accuracy | 10-bit data load (9-bit effective), ±1.0° typical accuracy over 112° range - optimized for fuel/temperature/oil pressure gauges with fixed-bias coil topology. |
| Serial Interface Speed | 1.6 MHz max SCLK frequency (625 ns cycle time) - supports real-time gauge updates in fast-changing vehicle dynamics. |
| Standby Current | 60 µA at 12 V - minimizes battery drain during ignition-off periods in modern always-on vehicle architectures. |
| Thermal Package | SO-28 thermally enhanced package (SOT136-1) with 8 ground pins for PCB heat spreading - sustains 1400 mW dissipation at +105°C ambient. |
| Output Protection | Open-drain ST pin reports thermal shutdown, overcurrent, or RUN/GOE disable - allows wire-OR fault aggregation across multiple gauge drivers. |
Pinout & Package
Package: SO-28 thermally enhanced surface-mount package (SOT136-1), with eight GND pins (6,7,8,9,20,21,22,23) serving as thermal vias and circuit ground reference.
| 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 amplitude - enable high-fidelity air-core meter movement without external H-bridge. |
| C1+, C1–, C2+, C2– | Minor gauge coil drive outputs | Single-ended 112° drive outputs referenced to COM - each pair drives one minor gauge coil with DAC-controlled current. |
| COM | Minor gauge bias common node | Regulated output at 0.475–0.525 × SwBATT - supplies fixed bias voltage to second coil of each minor gauge. |
| SwBATT1, SwBATT2 | Switched battery supply inputs | Independent 7.5–16 V inputs powering DACs and output buffers - must be externally connected to same PNP collector but serve separate internal circuits. |
| SwCONTROL | Protected battery switch control | Active-high output driving external PNP base - enables/disables SwBATT supplies based on RUN, GOE, and fault conditions. |
| DATAIN / DATAOUT / SCLK / CS | Serial interface I/O and control | MSB-first SPI-compatible interface with status feedback - supports daisy-chained topology with SA5775A/SA5777A/other SA5778D,512 units. |
| GOE / RUN | Gauge output and ignition sense enables | GOE (active-high) enables all coil drivers; RUN (active-high) indicates ignition state - together they define four operational modes per Table 1. |
| ST | Fault status output | Open-drain, active-low signal indicating thermal shutdown, overcurrent, or GOE/RUN disable - supports wired-OR fault bus for multi-driver systems. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-gauge integration | Single-chip solution for 1×360° + 2×112° air-core gauges eliminates discrete driver count and interconnect complexity in instrument clusters. |
| Serial daisy-chain capability | DATAOUT-to-DATAIN cascading with shared SCLK/CS enables expansion to >3 gauges using one microcontroller port - reduces MCU pin count and PCB routing. |
| Protected SwBATT distribution | SwCONTROL-gated SwBATT1/SwBATT2 supplies power and overvoltage protection to external SA5775A/SA5777A drivers - removes need for separate protection circuitry. |
| Hardware fault reporting | ST pin and serial status bits provide immediate visibility into thermal shutdown, overcurrent, or supply faults - enables fail-safe dashboard behavior per ISO 26262 ASIL-B requirements. |
| Zero-jump startup control | Run-initiated sequence forces minor gauges to zero before enabling major gauge drivers - prevents erratic needle movement during ignition-on transition. |
Applications
| Automotive Instrument Cluster | Multi-Gauge Dashboard System |
|---|---|
|
Use Scenario: Centralized control of speedometer, fuel, and temperature gauges in OEM passenger vehicle dashboards. IC Role / Device Role / Timing Role: Primary gauge driver IC receiving serial commands from 80C51 or similar MCU; manages coil drive timing, bias sequencing, and fault response. Use Value: Reduces BOM count by replacing three discrete drivers; enables consistent 10-bit resolution and ±0.5° accuracy across all gauges with single calibration routine. |
Use Scenario: Expansion beyond three gauges using daisy-chained SA5778D,512 + SA5777A units in commercial vehicle or premium car clusters. IC Role / Device Role / Timing Role: Master STGD in serial chain providing SwBATT protection and status aggregation; coordinates timing via shared SCLK/CS with slave drivers. Use Value: Eliminates need for additional voltage regulators or protection ICs for slave drivers; maintains synchronized update timing across all gauges. |
| Fail-Safe Gauge Management | Low-Power Ignition-State Control |
|
Use Scenario: Detection and response to thermal overload or shorted coil faults in harsh under-hood environments. IC Role / Device Role / Timing Role: Real-time monitoring of die temperature and coil current; asserts ST pin within microseconds of fault detection. Use Value: Enables immediate needle park or warning illumination without MCU polling - meets ASIL-B diagnostic coverage requirements. |
Use Scenario: Power-state coordination between ignition switch (RUN) and MCU firmware (GOE) during vehicle start/stop cycles. IC Role / Device Role / Timing Role: Hardware-enforced transition through Standby → Startup → Normal → Power-down modes per Table 1 truth table. Use Value: Guarantees zero-needle position on power loss and prevents needle drift during sleep - critical for regulatory compliance and user experience. |
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 (2×112°); no major gauge support; lacks SwBATT distribution and COM bias regulator. | Only suitable for 2-gauge systems; cannot replace SA5778D,512 in 3-gauge or master-protection roles. | Select SA5777A only when expanding with secondary drivers in daisy-chain where SA5778D,512 provides SwBATT and control. |
| SA5775A | Single gauge driver (1×112°); no sine/cosine outputs; minimal serial status reporting (no ST pin). | Limited to single minor gauge; requires external protection circuitry and cannot participate in fault-aggregated ST bus. | Use SA5775A only as leaf-node slave in SA5778D,512-managed chains where full protection and status features are centralized. |
Compared with SA5777A and SA5775A, the SA5778D,512 uniquely integrates triple-gauge drive, SwBATT protection distribution, and hardware fault aggregation - making it the sole option for standalone 3-gauge clusters or master controllers in scalable multi-gauge systems.
Availability
SA5778D,512 is available at Aetrix Electronics and suitable for automotive instrument clusters, commercial vehicle dashboards, and industrial panel meters requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.
Supply support for SA5778D,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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SA5778D,512 belongs to NXP's legacy automotive analog driver portfolio, engineered specifically for high-reliability air-core gauge control in instrument clusters - emphasizing thermal robustness, fault resilience, and serial scalability.
FAQ
What is the function of the SwBATT1 and SwBATT2 pins on the SA5778D,512?
The SwBATT1 and SwBATT2 pins on the SA5778D,512 are independent switched battery supply inputs that power distinct internal circuit blocks: SwBATT1 supplies the major gauge DACs and output buffers, while SwBATT2 powers the minor gauge DACs, COM bias regulator, and related circuitry. Both must be connected to the collector of the same external PNP transistor controlled by SwCONTROL - they are not internally connected, ensuring isolation between major and minor gauge power domains and enabling precise fault containment.
How does the SA5778D,512 handle overvoltage conditions above 16 V?
The SA5778D,512 disables all gauge output drivers and shuts down SwBATT1/SwBATT2 when VBATT exceeds the overvoltage shutdown threshold (18–23 V). This protects connected air-core gauges from damage during alternator regulator failure. Critically, the ST pin does not reflect overvoltage faults - only thermal, overcurrent, and GOE/RUN disable events - because overvoltage is treated as a transient condition requiring external system-level response rather than driver-level reporting.
Can the SA5778D,512 drive a 360° gauge and two 112° gauges simultaneously?
Yes, the SA5778D,512 is explicitly designed to drive one 360° major gauge (via SIN+/SIN–/COS+/COS–) and two 112° minor gauges (via C1+/C1– and C2+/C2–) simultaneously. Its internal architecture allocates dedicated 10-bit DAC resources to the major gauge and two 9-bit (10-bit loaded) DACs to the minor gauges, with COM providing regulated bias to both minor gauge second coils - enabling concurrent, independent needle positioning without resource contention.
What is the purpose of the COM pin on the SA5778D,512?
The COM pin on the SA5778D,512 is a regulated output that supplies the bias voltage to the fixed coils of both minor gauges. It is actively maintained at 0.475–0.525 × SwBATT, ensuring stable magnetic field balance regardless of battery voltage fluctuations. This precision biasing is essential for accurate 112° needle deflection and eliminates the need for external voltage dividers or regulators in minor gauge circuits.
Does the SA5778D,512 support daisy-chaining with other gauge drivers?
Yes, the SA5778D,512 supports daisy-chaining via its DATAOUT pin, which connects to the DATAIN pin of subsequent SA5778D,512, SA5777A, or SA5775A devices. With shared SCLK and CS lines, up to 16 devices can be cascaded in a single serial bus. Status information from all devices is aggregated on the ST pins (wire-OR'd) and also returned serially, enabling centralized fault monitoring and coordinated gauge updates from one microcontroller.
SA5778D,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,512 FAQ
1.How can I place an order for SA5778D,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5778D,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,512 reliable?
The price and inventory of SA5778D,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,512 is usually 5 days.
3.What payment methods are accepted for SA5778D,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5778D,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA5778D,512?
SA5778D,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5778D,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,512?
For technical support, including SA5778D,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5778D,512 requirements.
6.How does Aetrix verify that SA5778D,512 is sourced from the original manufacturer or authorized distributors?
All SA5778D,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,512 meets industry standards.
7.What is the process for return or replacement of SA5778D,512?
All SA5778D,512 units undergo pre-shipment inspection (PSI). If there is an issue with SA5778D,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,512 part is unused and in its original packaging.
Return procedure for SA5778D,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA5778D,512 Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
