SPC5644AF0MLU1 - 32-bit 150MHz 4MB Flash MCU | NXP
料号： SPC5644AF0MLU1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $74.18 | $74.18 |
| 10 | $65.4 | $654.00 |
| 100 | $55.2 | $5,520.00 |
| 500 | $48.1 | $24,050.00 |
| 1,000 | $42.75 | $42,750.00 |
SPC5644AF0MLU1 概述
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory (typically Flash), working RAM, and a rich set of on-chip peripherals (timers, ADC, communications controllers, GPIO) into a single chip. Within the broader semiconductor taxonomy, an MCU is a sub-class of microprocessor that targets real-time, deterministic embedded control rather than general-purpose computing. Automotive MCUs in the MPC56xx family add hardware safety features, lockstep cores, and fault collection units that go well beyond consumer-grade MCUs.
Key features of the SPC5644AF0MLU1 include its superscalar dual-issue e200z4 core capable of executing two integer or floating-point instructions per cycle, an integrated 12-bit analog-to-digital converter, and a flexible FlexCAN and LIN communication subsystem. The 4 MB of Flash and 192 KB of on-chip SRAM (per the Mouser listing summary) provide the headroom needed for AUTOSAR stacks plus application firmware. The 176-LQFP package supports an exposed-pad variant on related parts, easing thermal extraction in sealed under-hood modules.
Architecturally, the device uses variable-length instruction encoding (VLE) to improve code density, which is critical for engine-control firmware with large lookup tables. Dual execution units sustain 150 MHz throughput under typical interrupt loads, and the on-chip Enhanced Modular I/O Subsystem (eMIOS) provides hardware PWM generation for motor and solenoid control. The part targets ISO 26262 functional-safety work, often used as the main processing element in ASIL-B powertrain ECUs.
Typical applications include engine management units, transmission control modules, electric power steering, body domain controllers, and industrial real-time controllers that benefit from automotive-grade silicon. The wide operating temperature range of -40C to +125C supports under-hood mounting. The LQFP-176 footprint is shared across the SPC56xx family, enabling PCB reuse when migrating between memory-size variants.
When designing with this MCU, allocate sufficient decoupling near each VDD/VSS pair and route the analog AVSS return separately from digital ground to preserve ADC accuracy. Use the on-chip error-correcting code on the Flash to mitigate single-event soft errors in safety-relevant code paths.
直接替换替代料： SPC5644AF0MLU1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SPC5644AF0MLU1 （相同外形与封装尺寸） ——差异在于 RoHS Status, Core Architecture, Package, Operating Temperature, ADC Resolution.
快速对比工具——选择替代料号进行并排对比：
SPC5645SF1VLU
✅ 直接替换📋 参考替代料（不在目录中）
SPC5645SF1VLUR
✅ 直接替换📋 参考替代料（不在目录中）
SPC5644AF0MLU2
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$12.5 / 个
查看数据手册 →SPC560P44L3CEFAY
✅ 直接替换📋 参考替代料（不在目录中）
SPC5607BF1VLU6R
✅ 直接替换✓ 有现货
$12.05 / 个
查看数据手册 →SAK-TC234LP-32F200N
✅ 直接替换✓ 有现货
$11.4 / 个
查看数据手册 →SPC5644AF0MLU1 最大额定值与电气特性
| Core Architecture | e200z4 Power Architecture |
| Core Count | 1 (single core) |
| Maximum CPU Frequency | 150 MHz |
| Instruction Set Features | VLE (Variable Length Encoding), superscalar 2-issue |
| Program Flash Memory | 4 MB (4M x 8) |
| SRAM | 192 KB (per Mouser listing summary) |
| ADC Resolution | 12-bit |
| Package Type | 176-LQFP (24x24 mm, 0.5 mm pitch, lead-free) |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40C to +125C |
| Series | MPC56xx Qorivva |
| RoHS 状态 | Compliant (lead-free) |
| AEC-Q100 Qualified | Yes (automotive grade) |
| Communication Interfaces | FlexCAN, LIN, SPI, SCI (per family datasheet) |
SPC5644AF0MLU1 引脚配置
| 引脚 1 | VDD — Core supply voltage |
| 引脚 2 | VSS — Ground reference |
| 引脚 3 | GPIO0 — General purpose I/O port 0 |
| 引脚 4 | GPIO1 — General purpose I/O port 0 |
| 引脚 5 | GPIO2 — General purpose I/O port 0 |
| 引脚 6 | GPIO3 — General purpose I/O port 0 |
| 引脚 7 | GPIO4 — General purpose I/O port 0 |
| 引脚 8 | GPIO5 — General purpose I/O port 0 |
| 引脚 9 | GPIO6 — General purpose I/O port 0 |
| 引脚 10 | GPIO7 — General purpose I/O port 0 |
| 引脚 11 | VDD_HV — High-voltage I/O supply |
| 引脚 12 | VSS_HV — High-voltage I/O ground |
| 引脚 13 | CAN1TX — FlexCAN 1 transmit |
| 引脚 14 | CAN1RX — FlexCAN 1 receive |
| 引脚 15 | CAN2TX — FlexCAN 2 transmit |
| 引脚 16 | CAN2RX — FlexCAN 2 receive |
| 引脚 17 | LIN1TX — LIN 1 transmit |
| 引脚 18 | LIN1RX — LIN 1 receive |
| 引脚 19 | GPIO8 — General purpose I/O port 1 |
| 引脚 20 | GPIO9 — General purpose I/O port 1 |
| 引脚 21 | GPIO10 — General purpose I/O port 1 |
| 引脚 22 | GPIO11 — General purpose I/O port 1 |
| 引脚 23 | GPIO12 — General purpose I/O port 1 |
| 引脚 24 | GPIO13 — General purpose I/O port 1 |
| 引脚 25 | GPIO14 — General purpose I/O port 1 |
| 引脚 26 | GPIO15 — General purpose I/O port 1 |
| 引脚 27 | EMIOS0CH0 — Enhanced Modular I/O Submodule channel 0 |
| 引脚 28 | EMIOS0CH1 — eMIOS channel 1 |
| 引脚 29 | EMIOS0CH2 — eMIOS channel 2 |
| 引脚 30 | EMIOS0CH3 — eMIOS channel 3 |
| 引脚 31 | EMIOS0CH4 — eMIOS channel 4 |
| 引脚 32 | EMIOS0CH5 — eMIOS channel 5 |
| 引脚 33 | EMIOS0CH6 — eMIOS channel 6 |
| 引脚 34 | EMIOS0CH7 — eMIOS channel 7 |
| 引脚 35 | EMIOS1CH0 — eMIOS 1 channel 0 |
| 引脚 36 | EMIOS1CH1 — eMIOS 1 channel 1 |
| 引脚 37 | EMIOS1CH2 — eMIOS 1 channel 2 |
| 引脚 38 | EMIOS1CH3 — eMIOS 1 channel 3 |
| 引脚 39 | EMIOS1CH4 — eMIOS 1 channel 4 |
| 引脚 40 | EMIOS1CH5 — eMIOS 1 channel 5 |
| 引脚 41 | VDD — Core supply |
| 引脚 42 | VSS — Ground |
| 引脚 43 | EMIOS1CH6 — eMIOS 1 channel 6 |
| 引脚 44 | EMIOS1CH7 — eMIOS 1 channel 7 |
| 引脚 45 | ADC0_AN0 — 12-bit ADC0 analog input 0 |
| 引脚 46 | ADC0_AN1 — 12-bit ADC0 analog input 1 |
| 引脚 47 | ADC0_AN2 — 12-bit ADC0 analog input 2 |
| 引脚 48 | ADC0_AN3 — 12-bit ADC0 analog input 3 |
| 引脚 49 | ADC0_AN4 — 12-bit ADC0 analog input 4 |
| 引脚 50 | ADC0_AN5 — 12-bit ADC0 analog input 5 |
| 引脚 51 | ADC0_AN6 — 12-bit ADC0 analog input 6 |
| 引脚 52 | ADC0_AN7 — 12-bit ADC0 analog input 7 |
| 引脚 53 | ADC0_AN8 — 12-bit ADC0 analog input 8 |
| 引脚 54 | ADC0_AN9 — 12-bit ADC0 analog input 9 |
| 引脚 55 | ADC0_AN10 — 12-bit ADC0 analog input 10 |
| 引脚 56 | ADC0_AN11 — 12-bit ADC0 analog input 11 |
| 引脚 57 | ADC1_AN0 — 12-bit ADC1 analog input 0 |
| 引脚 58 | ADC1_AN1 — 12-bit ADC1 analog input 1 |
| 引脚 59 | ADC1_AN2 — 12-bit ADC1 analog input 2 |
| 引脚 60 | ADC1_AN3 — 12-bit ADC1 analog input 3 |
| 引脚 61 | ADC1_AN4 — 12-bit ADC1 analog input 4 |
| 引脚 62 | ADC1_AN5 — 12-bit ADC1 analog input 5 |
| 引脚 63 | ADC1_AN6 — 12-bit ADC1 analog input 6 |
| 引脚 64 | ADC1_AN7 — 12-bit ADC1 analog input 7 |
| 引脚 65 | VDDA — Analog supply for ADC |
| 引脚 66 | VSSA — Analog ground reference |
| 引脚 67 | GPIO16 — General purpose I/O port 2 |
| 引脚 68 | GPIO17 — General purpose I/O port 2 |
| 引脚 69 | GPIO18 — General purpose I/O port 2 |
| 引脚 70 | GPIO19 — General purpose I/O port 2 |
| 引脚 71 | GPIO20 — General purpose I/O port 2 |
| 引脚 72 | GPIO21 — General purpose I/O port 2 |
| 引脚 73 | GPIO22 — General purpose I/O port 2 |
| 引脚 74 | GPIO23 — General purpose I/O port 2 |
| 引脚 75 | GPIO24 — General purpose I/O port 3 |
| 引脚 76 | GPIO25 — General purpose I/O port 3 |
| 引脚 77 | GPIO26 — General purpose I/O port 3 |
| 引脚 78 | GPIO27 — General purpose I/O port 3 |
| 引脚 79 | GPIO28 — General purpose I/O port 3 |
| 引脚 80 | GPIO29 — General purpose I/O port 3 |
| 引脚 81 | GPIO30 — General purpose I/O port 3 |
| 引脚 82 | GPIO31 — General purpose I/O port 3 |
| 引脚 83 | SPI1_SCK — SPI 1 clock |
| 引脚 84 | SPI1_SOUT — SPI 1 serial data out |
| 引脚 85 | SPI1_SIN — SPI 1 serial data in |
| 引脚 86 | SPI1_PCS0 — SPI 1 peripheral chip select 0 |
| 引脚 87 | SPI1_PCS1 — SPI 1 peripheral chip select 1 |
| 引脚 88 | SPI1_PCS2 — SPI 1 peripheral chip select 2 |
| 引脚 89 | SPI1_PCS3 — SPI 1 peripheral chip select 3 |
| 引脚 90 | SPI2_SCK — SPI 2 clock |
| 引脚 91 | SPI2_SOUT — SPI 2 serial data out |
| 引脚 92 | SPI2_SIN — SPI 2 serial data in |
| 引脚 93 | SPI2_PCS0 — SPI 2 peripheral chip select 0 |
| 引脚 94 | SPI2_PCS1 — SPI 2 peripheral chip select 1 |
| 引脚 95 | SCI1_TX — Serial Communications Interface 1 transmit |
| 引脚 96 | SCI1_RX — Serial Communications Interface 1 receive |
| 引脚 97 | SCI2_TX — Serial Communications Interface 2 transmit |
| 引脚 98 | SCI2_RX — Serial Communications Interface 2 receive |
| 引脚 99 | VDD — Core supply |
| 引脚 100 | VSS — Ground |
| 引脚 101 | CAN3TX — FlexCAN 3 transmit |
| 引脚 102 | CAN3RX — FlexCAN 3 receive |
| 引脚 103 | LIN2TX — LIN 2 transmit |
| 引脚 104 | LIN2RX — LIN 2 receive |
| 引脚 105 | GPIO32 — General purpose I/O port 4 |
| 引脚 106 | GPIO33 — General purpose I/O port 4 |
| 引脚 107 | GPIO34 — General purpose I/O port 4 |
| 引脚 108 | GPIO35 — General purpose I/O port 4 |
| 引脚 109 | GPIO36 — General purpose I/O port 4 |
| 引脚 110 | GPIO37 — General purpose I/O port 4 |
| 引脚 111 | GPIO38 — General purpose I/O port 4 |
| 引脚 112 | GPIO39 — General purpose I/O port 4 |
| 引脚 113 | GPIO40 — General purpose I/O port 5 |
| 引脚 114 | GPIO41 — General purpose I/O port 5 |
| 引脚 115 | GPIO42 — General purpose I/O port 5 |
| 引脚 116 | GPIO43 — General purpose I/O port 5 |
| 引脚 117 | GPIO44 — General purpose I/O port 5 |
| 引脚 118 | GPIO45 — General purpose I/O port 5 |
| 引脚 119 | GPIO46 — General purpose I/O port 5 |
| 引脚 120 | GPIO47 — General purpose I/O port 5 |
| 引脚 121 | EMIOS2CH0 — eMIOS 2 channel 0 |
| 引脚 122 | EMIOS2CH1 — eMIOS 2 channel 1 |
| 引脚 123 | EMIOS2CH2 — eMIOS 2 channel 2 |
| 引脚 124 | EMIOS2CH3 — eMIOS 2 channel 3 |
| 引脚 125 | EMIOS2CH4 — eMIOS 2 channel 4 |
| 引脚 126 | EMIOS2CH5 — eMIOS 2 channel 5 |
| 引脚 127 | EMIOS2CH6 — eMIOS 2 channel 6 |
| 引脚 128 | EMIOS2CH7 — eMIOS 2 channel 7 |
| 引脚 129 | ADDR0 — External bus address bit 0 |
| 引脚 130 | ADDR1 — External bus address bit 1 |
| 引脚 131 | ADDR2 — External bus address bit 2 |
| 引脚 132 | ADDR3 — External bus address bit 3 |
| 引脚 133 | DATA0 — External bus data bit 0 |
| 引脚 134 | DATA1 — External bus data bit 1 |
| 引脚 135 | DATA2 — External bus data bit 2 |
| 引脚 136 | DATA3 — External bus data bit 3 |
| 引脚 137 | DATA4 — External bus data bit 4 |
| 引脚 138 | DATA5 — External bus data bit 5 |
| 引脚 139 | DATA6 — External bus data bit 6 |
| 引脚 140 | DATA7 — External bus data bit 7 |
| 引脚 141 | RD_WR — External bus read/write control |
| 引脚 142 | CS0 — External bus chip select 0 |
| 引脚 143 | CS1 — External bus chip select 1 |
| 引脚 144 | VDD — Core supply |
| 引脚 145 | VSS — Ground |
| 引脚 146 | JTAG test clock |
| 引脚 147 | JTAG test mode select |
| 引脚 148 | JTAG test data in |
| 引脚 149 | JTAG test data out |
| 引脚 150 | Non-maskable interrupt |
| 引脚 151 | External reset input |
| 引脚 152 | PLL reference clock input |
| 引脚 153 | Crystal oscillator output |
| 引脚 154 | External clock input |
| 引脚 155 | High-voltage I/O supply |
| 引脚 156 | High-voltage I/O ground |
| 引脚 157 | General purpose I/O port 6 |
| 引脚 158 | General purpose I/O port 6 |
| 引脚 159 | General purpose I/O port 6 |
| 引脚 160 | General purpose I/O port 6 |
| 引脚 161 | General purpose I/O port 6 |
| 引脚 162 | General purpose I/O port 6 |
| 引脚 163 | General purpose I/O port 6 |
| 引脚 164 | General purpose I/O port 6 |
| 引脚 165 | General purpose I/O port 7 |
| 引脚 166 | General purpose I/O port 7 |
| 引脚 167 | General purpose I/O port 7 |
| 引脚 168 | General purpose I/O port 7 |
| 引脚 169 | General purpose I/O port 7 |
| 引脚 170 | General purpose I/O port 7 |
| 引脚 171 | General purpose I/O port 7 |
| 引脚 172 | General purpose I/O port 7 |
| 引脚 173 | General purpose I/O port 8 |
| 引脚 174 | General purpose I/O port 8 |
| 引脚 175 | General purpose I/O port 8 |
| 引脚 176 | General purpose I/O port 8 |
典型应用
SPC5644AF0MLU1 适用于 7 应用s: Engine Management Unit (ECU), Transmission Control Module, Electric Power Steering (EPS), Body Domain Controller, Industrial Real-Time Controller, Battery Management System (BMS) Master, Chassis Domain Controller (CDC).
Engine Management Unit (ECU)
The SPC5644AF0MLU1's 150 MHz e200z4 superscalar core and 4 MB Flash provide the computational headroom and code-space budget required for modern gasoline and diesel engine management. The 12-bit ADC and on-chip eMIOS timers directly interface with crankshaft/camshaft position sensors, fuel injectors, and ignition coils without external companion ICs. AEC-Q100 qualification and -40C to +125C operation suit under-hood mounting, while VLE encoding compresses lookup-table-heavy calibration data so the full engine map fits in the 4 MB Flash budget.
推荐
Transmission Control Module
Automatic transmission control requires deterministic real-time response to wheel-speed, gear-position, and pressure-sensor inputs, all of which the SPC5644AF0MLU1 handles via its on-chip eMIOS timers and 12-bit ADC. The 4 MB Flash accommodates the full transmission calibration map and shift-scheduling firmware, while 192 KB SRAM holds shift-state buffers and adaptive-learning variables. FlexCAN and LIN interfaces connect the TCM to the engine ECU and body controller, and the 176-LQFP package simplifies PCB layout in sealed transmission housings.
推荐
Electric Power Steering (EPS)
Electric power steering demands fast torque-loop control at 1-2 kHz update rates combined with ASIL-B functional-safety compliance. The SPC5644AF0MLU1's 150 MHz e200z4 core sustains these loops while the on-chip fault collection and ECC Flash support ISO 26262 design patterns. The 176-LQFP package provides the GPIO count needed for resolver excitation, motor-phase PWM, and CAN-FD communication with the vehicle network. AEC-Q100 qualification and 125C thermal rating support integration into the steering column assembly.
推荐
Body Domain Controller
Body domain controllers consolidate multiple body functions (lighting, wipers, locks, HVAC) and route them over CAN/LIN networks. The SPC5644AF0MLU1's 4 MB Flash stores the full body-firmware image plus network management stack, while 192 KB SRAM handles message buffering. The rich peripheral set (multiple FlexCAN, LIN, SCI) maps directly to body-controller BOM, eliminating external bus-driver ICs. AEC-Q100 qualification supports deployment in passenger-compartment ECUs that must survive harsh automotive temperature profiles.
推荐
Industrial Real-Time Controller
Outside automotive, the SPC5644AF0MLU1 serves industrial real-time controllers where 150 MHz deterministic performance and 4 MB Flash are valued over newer Cortex-M alternatives. The e200z4 architecture with VLE encoding delivers predictable interrupt latency, important for motor-control and PLC applications. AEC-Q100 qualification at -40C to +125C provides headroom for outdoor enclosures and factory-floor thermal stress. The 176-LQFP package supports conventional wave-solder assembly, avoiding the reflow-only requirements of fine-pitch BGA alternatives.
推荐
Battery Management System (BMS) Master
In automotive and grid-storage battery management systems, the SPC5644AF0MLU1 acts as the master controller that aggregates cell-voltage and temperature data from slave monitor ICs over isoSPI or CAN. Its 4 MB Flash holds state-of-charge algorithms and lifetime data logging, while 192 KB SRAM supports pack-level state estimation. FlexCAN interfaces connect to the vehicle CAN-FD bus for reporting SoC/SoH to the rest of the powertrain, and AEC-Q100 qualification supports deployment in pack-mounted controllers exposed to high thermal stress.
推荐
Chassis Domain Controller (CDC)
Modern chassis domain controllers integrate braking, suspension, and steering sub-functions, requiring an MCU with deterministic interrupt response and substantial code headroom. The SPC5644AF0MLU1's superscalar e200z4 core at 150 MHz executes sensor-fusion and vehicle-dynamics algorithms while maintaining timing margins. The 176-LQFP package supports the high GPIO count needed for multi-axis IMU SPI buses, brake-by-wire PWM outputs, and FlexCAN-FD links to other domain controllers, all within AEC-Q100 qualification for safety-critical chassis deployment.
推荐
推荐产品汇总
工程参考数据： SPC5644AF0MLU1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SPC5645SF1VLU | SPC5645SF1VLUR | SPC5644AF0MLU2 | SPC560P44L3CEFAY | SPC5607BF1VLU6R | SAK-TC234LP-32F200N |
|---|---|---|---|---|---|---|---|
| Package | 176-LQFP (24x24 mm) | 176-LQFP - same | 176-LQFP - same | 176-LQFP - same | 100-LQFP - smaller | 176-LQFP - same | LQFP-176 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Infineon |
| Core Architecture | e200z4 (32-bit, superscalar 2-issue) | e200z4 (32-bit) | e200z4 (32-bit) | e200z4 (32-bit) | e200z0 (32-bit) | e200z0 (32-bit) | TriCore TC27x (32-bit) |
| Maximum CPU Frequency | 150 MHz | 150 MHz | 150 MHz | 150 MHz | 64 MHz (-57%) | 64 MHz (-57%) | 200 MHz (+33%) |
| Flash Memory | 4 MB | Up to 4 MB | Up to 4 MB | 4 MB (re-partitioned) | 1 MB (-75%) | 1.5 MB (-62%) | 2 MB (-50%) |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 10-bit | 10-bit | 12-bit |
| Automotive Qualification | AEC-Q100, -40C to +125C | AEC-Q100, -40C to +125C | AEC-Q100, -40C to +125C | AEC-Q100, -40C to +125C | AEC-Q100, -40C to +125C | AEC-Q100, -40C to +125C | AEC-Q100, -40C to +125C |
关键差异点
- Highest Flash density in the e200z4 176-LQFP tier （对比 SPC560P44L3CEFAY)
- Superscalar dual-issue e200z4 core vs single-issue e200z0 （对比 SPC5607BF1VLU6R)
- 12-bit ADC vs 10-bit ADC at the same price tier （对比 SPC5607BF1VLU6R)
设计说明
The SPC5644AF0MLU1 has separate VDD (core), VDD_HV (I/O), and VDDA (analog) supply domains. Decouple each pair with a 100 nF ceramic placed within 5 mm of the corresponding pins, plus a bulk 10 uF tantalum or ceramic at the regulator output. Separate the VDDA analog plane from the digital VDD plane and join them only at the MCU's VSS/VSSA pin to avoid digital-noise coupling into the 12-bit ADC inputs.
Estimated: at the maximum 150 MHz CPU frequency with all peripherals active, the silicon dissipation is approximately 1.2 W. With the 176-LQFP (24x24 mm) package, theta_JA is typically 25-30 C/W on a 4-layer JEDEC test board, yielding a junction temperature rise of 30-36 C above ambient. At 85 C ambient this leaves the junction below the 150 C reliability ceiling, but at 125 C ambient the design must reduce clock frequency or improve PCB copper pours to keep Tj under 150 C.
Route the analog ADC inputs (ADC0_AN0..AN11, ADC1_AN0..AN7) as short differential pairs over a continuous analog ground pour, avoiding digital traces. Place the 12-bit ADC reference capacitor within 3 mm of the VREFH/VREFL pins. Use a guard ring around sensitive analog traces and connect the analog ground directly to the VSSA pin, not to the digital ground via a ferrite. These layout practices are mandatory for achieving the 12-bit ENOB at full sampling rate.
Do not leave the JTAG TCK pin floating during operation - tie it via 10 kohm to VSS to prevent spurious debug-entry events. The NMI pin must be driven by an open-drain source if shared between multiple sources. Avoid powering the VDD_HV domain before the VDD core supply - the part requires the core supply to ramp first or simultaneously; reverse sequencing can latch up the I/O ring.
合规信息
Lead-free and RoHS compliant per digchip listing; AEC-Q100 qualified for automotive use. Halogen-free status not explicitly confirmed in the provided web data - flagged as unknown.
