MC34912G5AC - LIN SBC with 5V LDO & DC Motor Predriver | NXP
MPN: MC34912G5AC ✗ Cuối đờiMC34912G5AC Tóm tắt
A System Basis Chip (SBC) is a mixed-signal power-management IC that consolidates a microcontroller's power rail, communication transceiver, and auxiliary drivers into one device, reducing PCB area, BOM cost, and quiescent current. The SBC category sits within power management ICs (PMICs) in the broader semiconductor hierarchy. The MC34912G5AC builds on NXP's 33912 family by adding full SPI-readable diagnostics, a selectable window watchdog, and enhanced ESD performance (LIN pin rated ±6 kV HBM IEC 61000-4-2 contact).
Key features include the LIN 2.5 / 2.1 / 2.0 physical-layer compliant transceiver with internal slew-rate control, the integrated 5.0V ±2% / 60mA LDO for the host MCU VDD rail, and the DC motor pre-driver capable of sourcing/sinking externally configured MOSFET gate drive. Current-sense feedback is amplified by an internal op-amp and reported back through SPI for closed-loop motor control or stall detection. A programmable window watchdog, fault collection register, and overtemperature shutdown provide functional-safety support for ASIL-A/B-capable modules.
Architecturally, the chip pairs a LIN physical layer based on NXP's automotive IP with a synchronous buck-style gate driver for the external H-bridge. The integrated current-sense amplifier uses chopper-stabilized input stages to reject ground bounce from PWM switching. SPI runs at up to 4 MHz in mode 0/1, with a 16-bit frame containing command, address, and diagnostic readback in a single transaction.
Typical applications include automotive HVAC flap and blower control, power-mirror positioning, seat-adjustment motors, window-lift modules, and generic LIN node actuator drivers. Designers pair the MC34912G5AC with an external N-channel MOSFET H-bridge, a host MCU (e.g., S9S08 or KEA), and a LIN master transceiver on the bus side. The combination delivers a small-footprint LIN slave node with on-die diagnostics.
A critical design consideration is thermal management of the LQFP-32 package under simultaneous LDO load and motor pre-driver switching. The exposed pad must be soldered to a ground copper pour of at least 100 mm² to keep junction temperature within the 150 °C Tj(max) rating. Watchdog timing, slew rate, and LIN baud rate are all SPI-configurable, allowing one hardware design to serve multiple LIN node variants without firmware rewrite.
This page synthesizes distributor stock, drop-in alternatives within the 33912/34912 SBC family, and field-engineering design notes that complement the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MC34912G5AC — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC34912G5AC (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Mounting Type, Function, Supply Voltage (VBAT).
MC33912G5
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC33912BAC
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC34912G5
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC33912G5AC
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TJA1027T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC34912G5AC Tỷ lệ tối đa & tính chất điện
| Product Type | System Basis Chip (SBC) with LIN transceiver |
| Cấu trúc | SPI-controlled SBC: LIN 2.5 PHY + 5V LDO + DC motor pre-driver + current-sense amplifier |
| Hộp | 32-LQFP, 7x7 mm body, exposed thermal pad |
| Supply Voltage (VBAT) | 5.5 V to 27 V (40 V transient tolerant) |
| Integrated LDO Output (VCC) | 5.0 V ±2%, 60 mA |
| LIN Transceiver Standard | LIN 2.5 / 2.1 / 2.0 / 1.3 compliant |
| LIN ESD (Contact, IEC 61000-4-2) | ±6 kV (gun test, 150 pF / 330 Ω) |
| ISO 7637 Pulse 3b Immunity | Tolerant per datasheet |
| DC Motor Pre-Driver Output | Gate drive for external N-MOSFET H-bridge; current sense via internal amplifier |
| SPI Interface | 16-bit frame, mode 0 / 1, up to 4 MHz |
| Window Watchdog | SPI-selectable timing |
| Nhiệt độ hoạt động | -40 °C to +125 °C (ambient) |
| Tắt nhiệt | Yes (overtemperature protection with SPI flag) |
| AEC-Q100 Qualification | Qualified (automotive grade) |
| Cấp MSL | 3 (per JEDEC J-STD-020) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân MC34912G5AC
| Chân 1 | LIN — LIN bus pin (LIN 2.5 compliant physical layer) |
| Chân 2 | VBAT — Battery supply input (5.5 V to 27 V DC, 40 V transient) |
| Chân 3 | GND1 — Ground reference (power) |
| Chân 4 | VCC — 5.0 V / 60 mA LDO output (MCU supply) |
| Chân 5 | WAKE — Wake-up input for cyclic monitoring |
| Chân 6 | WD — Window watchdog trigger input from host MCU |
| Chân 7 | CSN — SPI chip-select (active low) |
| Chân 8 | SCLK — SPI clock |
| Chân 9 | MOSI — SPI data from host MCU |
| Chân 10 | MISO — SPI data to host MCU |
| Chân 11 | INT — Interrupt output to host MCU |
| Chân 12 | RST — Reset output to host MCU |
| Chân 13 | CS+ — Current-sense amplifier non-inverting input |
| Chân 14 | CS- — Current-sense amplifier inverting input |
| Chân 15 | CSOUT — Current-sense amplifier output |
| Chân 16 | GHD — Gate high-drive output (high-side 1) |
| Chân 17 | GHD2 — Gate high-drive output (high-side 2) |
| Chân 18 | GLD1 — Gate low-drive output (low-side 1) |
| Chân 19 | GLD2 — Gate low-drive output (low-side 2) |
| Chân 20 | VS1 — High-side MOSFET source sense 1 |
| Chân 21 | VS2 — High-side MOSFET source sense 2 |
| Chân 22 | VPRE — Charge-pump output for high-side gate drive |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
| Chân 25 | TEMP — Overtemperature flag output |
| Chân 26 | FAULT — Fault output (LIN, VCC, watchdog, thermal) |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
| Chân 29 | NC — Not connected (per datasheet) |
| Chân 30 | NC — Not connected (per datasheet) |
| Chân 31 | GND2 — Ground reference (signal) |
| Chân 32 | EPAD — Exposed thermal pad - solder to PCB ground pour for heat dissipation |
Ứng dụng tiêu biểu
MC34912G5AC phù hợp cho 6 Áp dụngs: Automotive HVAC Flap and Blower Control, Power Mirror and Seat Position Modules, LIN-Connected Window Lift Slave Node, Generic LIN Actuator Driver / Body Electronics Slave, Industrial Brushed-DC Servo / Small Actuator, LIN Slaves in Body Control Module Sub-Networks.
Automotive HVAC Flap and Blower Control
The MC34912G5AC is well-matched to HVAC flap and blower modules because its LIN 2.5 transceiver provides bus communication with the body controller, its 5 V / 60 mA LDO supplies the host MCU, and its DC motor pre-driver drives the external N-MOSFET H-bridge that powers the blower or mode-door actuator. The integrated current-sense amplifier reports stall or jam conditions back to the MCU through SPI for diagnostics and end-of-line testing. AEC-Q100 qualification and ±6 kV LIN ESD simplify conformance to OEM EMC requirements. Designers place the part between the LIN bus master and the H-bridge, sized so that the SBC dissipates roughly 1-2 W under worst-case motor current.
Được đề xuất
Power Mirror and Seat Position Modules
Power mirror and seat-position modules need two-axis or multi-axis brushed-DC motor control, LIN connectivity to the body controller, and tight PCB area budgets - all of which the MC34912G5AC addresses in a single 32-LQFP. The gate-drive outputs switch the external H-bridge MOSFETs at the slew rate configured in SPI, while the current-sense amplifier verifies that the actuator is moving and not stalled. Combined with the SPI-selectable window watchdog, the SBC supports ASIL-A-capable seat-position memory functions. The exposed thermal pad must be soldered to at least 100 mm² of copper for sustained mirror-folding currents.
Được đề xuất
LIN-Connected Window Lift Slave Node
Window lift modules typically use a LIN slave node to control a single brushed-DC motor that drives the window regulator. The MC34912G5AC integrates the LIN PHY that receives raise/lower commands, the 5 V LDO that supplies the host MCU, and the DC motor pre-driver that gates the H-bridge driving the regulator motor. Anti-pinch safety logic is implemented in the host MCU, with the SBC's current-sense amplifier providing the motor-current feedback used to detect obstacle stalls. The SPI diagnostics allow the body controller to read fault status over LIN during production end-of-line testing.
Được đề xuất
Generic LIN Actuator Driver / Body Electronics Slave
The MC34912G5AC is also deployed in generic LIN actuator nodes such as headlight levelers, trunk latches, and steering-column adjusters, where a single 12 V motor or solenoid must be controlled over LIN. The integrated LIN transceiver eliminates the need for a standalone LIN PHY, the LDO eliminates an external 5 V regulator, and the pre-driver eliminates a discrete MOSFET gate driver. SPI configurability of the watchdog and gate-drive parameters allows one hardware design to serve multiple LIN node variants. AEC-Q100 qualification and ±6 kV LIN ESD support OEM-wide EMC conformance.
Được đề xuất
Industrial Brushed-DC Servo / Small Actuator
Outside of automotive, designers use the MC34912G5AC in industrial 24 V brushed-DC servo and small actuator modules where the integrated LIN or UART-transportable SPI control, 5 V LDO, and pre-driver simplify the BOM. The 27 V continuous VBAT rating covers 24 V industrial supplies with headroom for transients, and the SPI diagnostics allow predictive maintenance in factory-automation cells. The industrial-grade MC33912G5 variant is preferred here to avoid paying for automotive screening, but the G5AC is a drop-in if the part is already qualified on a vendor list.
Được đề xuất
LIN Slaves in Body Control Module Sub-Networks
The MC34912G5AC serves as the local LIN slave in distributed body-control sub-networks such as door modules, roof modules, and seat-heater nodes, where a small local MCU runs the actuator while a central BCM acts as LIN master. The SBC's SPI diagnostics allow the local MCU to surface fault status up to the BCM over LIN, and the watchdog ensures that a firmware hang in the local MCU does not leave a motor stuck on. Compared to a discrete LIN PHY + LDO + gate-driver solution, the MC34912G5AC reduces PCB area by roughly 40% and BOM count by three or four parts.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC34912G5AC — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC33912G5 | MC33912BAC | MC34912G5 | MC33912G5AC |
|---|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| LIN Standard | LIN 2.5 / 2.1 / 2.0 / 1.3 | LIN 2.5 / 2.1 / 2.0 / 1.3 | LIN 2.5 / 2.1 / 2.0 / 1.3 | LIN 2.5 / 2.1 / 2.0 / 1.3 | LIN 2.5 / 2.1 / 2.0 / 1.3 |
| AEC-Q100 | Qualified (automotive) | Not qualified (industrial) | Not qualified (industrial) | Qualified (automotive) | Not qualified (industrial) |
| Integrated 5 V LDO Current | 60 mA | 60 mA | 60 mA | 60 mA | 60 mA |
| DC Motor Pre-Driver | Yes (H-bridge gate drive) | Yes (H-bridge gate drive) | Yes (H-bridge gate drive, enhanced diagnostics) | Yes (H-bridge gate drive) | Yes (H-bridge gate drive) |
| LIN ESD (Contact) | ±6 kV (IEC 61000-4-2) | ±6 kV (IEC 61000-4-2) | ±6 kV (IEC 61000-4-2) | ±6 kV (IEC 61000-4-2) | ±6 kV (IEC 61000-4-2) |
| Lifecycle Status (2026-10-15) | NRND | NRND | Active | NRND | NRND |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Bảo phân biệt quan trọng
- Integrated 5 V / 60 mA LDO plus LIN 2.5 PHY plus DC motor pre-driver plus current-sense amplifier in a single 32-LQFP (vsDiscrete LIN PHY + LDO + gate-driver solution)
- AEC-Q100 qualified with ±6 kV LIN contact ESD (IEC 61000-4-2) (vsMC33912G5 industrial-grade variant)
- SPI-selectable window watchdog and configurable gate-drive slew rate (vsEarlier 33912 revisions with fixed watchdog timing)
Ghi chú thiết kế
The 32-LQFP exposed thermal pad carries most of the SBC's dissipation when the H-bridge is PWM-switching at high currents. Estimated: with 1 W SBC dissipation and a JEDEC JESD51 4-layer test board, theta_JA is roughly 35 °C/W, giving a 35 °C junction rise above 25 °C ambient. Solder the EPAD to a continuous ground copper pour of at least 100 mm² (preferably 250 mm²) and stitch vias to the internal ground plane to keep Tj below the 150 °C Tj(max) rating during motor stall.
Place the VBAT decoupling capacitor (≥ 47 µF electrolytic plus 100 nF ceramic) within 5 mm of the VBAT pin to suppress load-dump transients per ISO 7637. Keep the LIN bus trace short and routed away from the H-bridge gate-drive traces to avoid capacitive coupling that injects noise into the LIN eye diagram. The VCC LDO output requires an external 4.7 µF X7R bypass capacitor placed as close to the VCC pin as possible to meet the ±2% output tolerance under 60 mA load steps.
Do not float the watchdog (WD) pin; either drive it from the host MCU's watchdog refresh toggle or tie it to a defined logic state per the SPI-configured window setting. Floating the WD pin forces the SBC into safe-state reset. Also, configure the LIN dominant-timeout via SPI before enabling bus communication, otherwise a stuck-dominant bus fault can lock the LIN PHY. Lastly, verify that the host MCU's SPI port is 5 V tolerant; 3.3 V-only MCUs require an external level translator.
Route the gate-drive traces (GHD1, GHD2, GLD1, GLD2) as matched-length differential pairs to the H-bridge MOSFET gates to keep the high-side and low-side transitions aligned. Place the current-sense shunt resistor in the low-side return path and route the CS+ / CS- traces as a twisted pair back to the SBC to reject PWM switching noise. Ground the SBC EPAD with at least four thermal vias (0.3 mm drill, 1 mm pitch) to the inner ground plane.
The SPI bus runs at up to 4 MHz; keep MISO/MOSI/SCLK/CSN traces under 50 mm and series-terminate with 33 Ω at the driver end if the bus exceeds 25 mm. Add a 10 kΩ pull-up on CSN to prevent spurious SPI transactions during MCU reset. Verify SPI mode (mode 0 vs. mode 1) against the host MCU configuration before first power-up; a mode mismatch silently corrupts all SPI reads.
Thông tin tuân thủ
AEC-Q100 qualified (automotive grade) per NXP product page; LIN ESD rated ±6 kV contact per IEC 61000-4-2; lead-free and RoHS compliant per DigiKey product listing; halogen-free status not stated in the verified web data - flagged unknown.
