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Texas Instruments AM1705DPTPA3
- Part No.:
- AM1705DPTPA3
- Manufacturer:
- Texas Instruments
- Category:
- Microprocessors
- Package:
- 176-LQFP Exposed Pad
- Datasheet:
-
AM1705DPTPA3.pdf
- Description:
- IC MPU SITARA 375MHZ 176HLQFP
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
AM1705DPTPA3 from Texas Instruments is a 375-MHz ARM926EJ-S™ microprocessor with 16KB instruction cache, 16KB data cache, 128KB on-chip RAM, and integrated 10/100 Mbps Ethernet MAC (EMAC) supporting RMII interface - deployed in industrial automation controllers requiring deterministic real-time I/O, secure boot, and Linux-capable embedded processing.
For engineers reviewing the AM1705DPTPA3 datasheet, AM1705DPTPA3 pinout, AM1705DPTPA3 application, or AM1705DPTPA3 equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral timing constraints, and direct alternative part comparisons for industrial HMI, portable test equipment, and networked edge node designs.
Technical Context
The AM1705DPTPA3 implements an ARMv5TEJ-compliant ARM926EJ-S core with MMU, enabling full Linux OS execution and memory protection. It integrates dual external memory interfaces: EMIFA for NAND/NOR flash and EMIFB for 16-bit SDRAM up to 128 MB, with dedicated AHB bus arbitration between ARM, EDMA3, and PRUSS subsystems.
Its programmable real-time unit subsystem (PRUSS) contains two independent 32-bit RISC PRU cores - each with 4KB instruction RAM and 512B data RAM - operating under unified PSC clock gating and interfacing via switched central resource (SCR), enabling offload of time-critical I/O tasks without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM926EJ-S at 375 MHz (1.2V core supply), supporting ARM/Thumb instructions and Jazelle Java acceleration |
| On-Chip Memory | 128KB SRAM + 64KB ROM + 16KB I-cache + 16KB D-cache + 8KB vector RAM - enables boot-from-ROM and cache-coherent real-time execution |
| EMAC Interface | IEEE 802.3-compliant 10/100 Mbps Ethernet MAC with RMII PHY interface and MDIO management port - supports deterministic packet handling in industrial networks |
| eHRPWM Outputs | 6 single-edge, 6 dual-edge symmetric, or 3 dual-edge asymmetric PWM outputs with dead-band generation - suitable for motor control and digital power conversion |
| EDMA3 Controller | 32 independent DMA channels + 8 QDMA channels + 2 transfer controllers - enables zero-CPU-overhead data movement between peripherals and memory |
| Package | 176-pin HLQFP (PTP suffix), 24 mm × 24 mm, 0.5 mm pitch, PowerPAD™ thermal pad - requires controlled-impedance PCB layout for signal integrity |
Pinout & Package
AM1705DPTPA3 uses a 176-pin HLQFP (PTP) package with exposed thermal pad (PowerPAD™). Pin assignment follows TI SPRS657F Rev. January 2017, with dedicated banks for EMIFA (pins 42–54, 55–61), EMIFB (pins 73–106), RMII Ethernet (pins 111–120), USB0 (pins 137–140), and PRUSS GPIO (pins 149–176).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 111–116 (AXR0[0]–AXR0[5]) | RMII TXD[0], TXD[1], TXEN, CRS_DV, RXD[0], RXD[1] | Direct connection to RMII-compliant PHY; no external MII-to-RMII bridge required |
| Pin 119–120 (AXR0[7], AXR0[8]) | MDIO_CLK, MDIO_D | Management Data I/O interface for PHY register configuration and status polling |
| Pin 137–138 (USB0_DP, USB0_DM) | USB 2.0 Full-Speed differential pair | Integrated USB 2.0 OTG PHY eliminates need for external transceiver in host/client mode |
| Pin 149–176 (GP5[10]–GP7[15]) | PRUSS GPIO / eCAP / eQEP / eHRPWM signals | Direct mapping to PRU subsystem I/O pins - enables bit-banged protocols and sub-microsecond response |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Real-Time Unit Subsystem (PRUSS) | Two independent 32-bit RISC PRU cores with local memory and dedicated interrupt controller - offloads time-critical I/O from ARM core |
| Enhanced Direct Memory Access (EDMA3) | 32-channel DMA with hardware-accelerated scatter-gather and QDMA for low-latency peripheral-to-memory transfers |
| Memory Protection Units (MPUs) | Dual MPU blocks enforce access rights across ARM, PRUSS, and DMA masters - critical for secure multi-tasking OS environments |
| Boot Flexibility | Supports boot from NAND, NOR, MMC/SD, UART, or USB - enables field firmware recovery and secure signed image validation |
| Industrial Temperature Range | –40°C to +105°C operation (industrial grade) - qualified for extended-life deployment in factory-floor and outdoor edge nodes |
Applications
| Industrial Automation Controller | Portable Data Terminal |
|---|---|
|
Use Scenario: Programmable logic controller (PLC) with EtherNet/IP connectivity, motion profiling, and HMI rendering. IC Role / Device Role / Timing Role: Central application processor executing Linux RTOS, managing EMAC for industrial protocol stacks, and driving eHRPWM/eQEP for servo axis control. Use Value: Single-chip integration of ARM9 CPU, PRUSS for deterministic I/O, and EMAC reduces BOM count and board area versus FPGA+MPU solutions. |
Use Scenario: Rugged handheld device for warehouse inventory scanning with barcode reader, Wi-Fi module, and battery-backed RTC. IC Role / Device Role / Timing Role: Main system controller running embedded Linux, interfacing UART to scanner, SPI to display, and USB to host PC for firmware updates. Use Value: On-chip 128KB RAM and boot-from-SD support enable fast cold-start and reliable field-upgrade capability without external boot ROM. |
| Test & Measurement Instrument | Home Automation Gateway |
|
Use Scenario: Portable oscilloscope with analog front-end ADC, real-time waveform analysis, and Ethernet data export. IC Role / Device Role / Timing Role: Host processor for data acquisition firmware, using EDMA3 to stream ADC samples into RAM and McASP for audio-class signal output. Use Value: Dual McASP interfaces with FIFO buffers allow simultaneous capture and playback at sample rates up to 192 kHz - essential for calibrated instrumentation. |
Use Scenario: Zigbee/Z-Wave to Wi-Fi bridge aggregating sensor data from smart lighting, thermostats, and door locks. IC Role / Device Role / Timing Role: Secure gateway SoC running OpenWrt, using I2C for sensor hub, UART for Zigbee module, and EMAC for upstream cloud connectivity. Use Value: Integrated MMU and memory protection units isolate Zigbee stack from Linux kernel - preventing firmware-level exploits from compromising home network security. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ARM-based microprocessor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM1808ZWT | 456-MHz ARM926EJ-S, 256KB RAM, same PTP package but higher core voltage (1.3V) and extended temperature range (–40°C to +125°C) | Better suited for high-throughput video analytics or multi-threaded real-time control where sustained 456-MHz operation is required | Select AM1808ZWT when thermal headroom allows 1.3V core supply and application demands >375-MHz deterministic performance |
| AM3352BZCZ100 | ARM Cortex-A8 at 1 GHz, PRU-ICSS instead of PRUSS, 128KB RAM, 324-pin BGA package - not pin-compatible | Targeted at higher-performance UI rendering, 2D graphics acceleration, and richer multimedia middleware stacks | Choose AM3352BZCZ100 only when migrating to Cortex-A architecture and redesigning PCB for BGA layout and DDR2/3 interface |
Compared with AM1705DPTPA3, AM1808ZWT offers higher clock speed and extended temperature tolerance but requires tighter core voltage regulation, while AM3352BZCZ100 provides Cortex-A8 performance and modern PRU-ICSS but mandates full PCB redesign due to incompatible packaging and memory interface.
Availability
AM1705DPTPA3 is available at Aetrix Electronics and suitable for industrial automation controllers, portable test equipment, and networked edge gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AM1705DPTPA3 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in industrial, automotive, and communications markets.
The AM1705DPTPA3 belongs to TI's Sitara™ ARM processor family, designed specifically for cost-sensitive, thermally constrained industrial applications requiring Linux support, real-time I/O, and integrated connectivity - not general-purpose computing.
FAQ
What is the maximum operating frequency of the AM1705DPTPA3?
The AM1705DPTPA3 operates at a maximum frequency of 375 MHz under nominal 1.2-V core supply conditions, as specified in the SPRS657F datasheet revision January 2017. This frequency is guaranteed across the industrial temperature range (–40°C to +105°C) and is distinct from the 456-MHz variant (AM1705DPTR3) which requires 1.3-V core voltage. The AM1705DPTPA3 does not support dynamic frequency scaling beyond this rated speed.
Does the AM1705DPTPA3 include an integrated USB PHY?
Yes, the AM1705DPTPA3 integrates a full-speed USB 2.0 OTG PHY on-die, accessible via pins 137 (USB0_DP) and 138 (USB0_DM). This eliminates the need for an external USB transceiver in both host and client configurations, and supports endpoint 0 (control) plus four configurable endpoints (1–4) for bulk, interrupt, or isochronous transfers - as confirmed in Section 6.24 of the SPRS657F datasheet.
Can the AM1705DPTPA3 boot directly from NAND flash?
Yes, the AM1705DPTPA3 supports NAND flash boot mode via its EMIFA interface, with hardware-assisted BCH error correction (up to 8-bit) and built-in ROM bootloader that initializes NAND controller, reads first-stage loader, and passes execution to user code. This capability is documented in Section 4.1 (Boot Modes) and Table 6-10 (EMIFA NAND Timing Parameters) of the SPRS657F datasheet.
What is the role of the PRUSS in the AM1705DPTPA3?
The PRUSS in the AM1705DPTPA3 consists of two independent 32-bit RISC programmable real-time units, each with 4KB instruction RAM and 512 bytes of data RAM. It operates under unified clock gating and communicates with the ARM core via the switched central resource (SCR), enabling deterministic sub-microsecond I/O handling - such as encoder counting, PWM synchronization, or custom protocol bridging - without CPU intervention.
Is the AM1705DPTPA3 pin-compatible with other Sitara processors like the AM1808?
No, the AM1705DPTPA3 is not pin-compatible with the AM1808 despite sharing the same 176-pin PTP package footprint. Differences in power domain assignments (e.g., PLL0_VDDA vs. PLL1_VDDA), I/O voltage groupings, and peripheral pin multiplexing prevent direct substitution. Migration requires schematic and layout revision, as confirmed by TI's device compatibility guidance in SPRS657F Section 3.2.
AM1705DPTPA3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 176-LQFP Exposed Pad
- Series:
- Sitara™
- Packaging:
- Tray
- Product Status:
- Active
- Core Processor:
- ARM926EJ-S
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 375MHz
- Co-Processors/DSP:
- System Control; CP15
- RAM Controllers:
- SDRAM
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- 10/100Mbps (1)
- SATA:
- -
- USB:
- USB 2.0 + PHY (1)
- Voltage - I/O:
- 1.8V, 3.3V
- Operating Temperature:
- -40°C ~ 105°C (TJ)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 176-HLQFP (24x24)
- Additional Interfaces:
- I2C, McASP, SPI, MMC/SD, UART
AM1705DPTPA3 FAQ
1.How can I place an order for AM1705DPTPA3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM1705DPTPA3 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 AM1705DPTPA3 reliable?
The price and inventory of AM1705DPTPA3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM1705DPTPA3 is usually 5 days.
3.What payment methods are accepted for AM1705DPTPA3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM1705DPTPA3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM1705DPTPA3?
AM1705DPTPA3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM1705DPTPA3 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 AM1705DPTPA3?
For technical support, including AM1705DPTPA3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM1705DPTPA3 requirements.
6.How does Aetrix verify that AM1705DPTPA3 is sourced from the original manufacturer or authorized distributors?
All AM1705DPTPA3 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 AM1705DPTPA3 meets industry standards.
7.What is the process for return or replacement of AM1705DPTPA3?
All AM1705DPTPA3 units undergo pre-shipment inspection (PSI). If there is an issue with AM1705DPTPA3, 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 AM1705DPTPA3 part is unused and in its original packaging.
Return procedure for AM1705DPTPA3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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