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Texas Instruments AM1705BPTP4
- Part No.:
- AM1705BPTP4
- Manufacturer:
- Texas Instruments
- Category:
- Microprocessors
- Package:
- 176-LQFP Exposed Pad
- Datasheet:
-
AM1705BPTP4.pdf
- Description:
- IC MPU SITARA 456MHZ 176HLQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
AM1705BPTP4 from Texas Instruments is a 375-MHz ARM926EJ-S™ microprocessor with 16KB instruction cache, 16KB data cache, 128KB on-chip RAM, and integrated peripherals including 10/100 Mbps Ethernet MAC (RMII), three UARTs (one with RTS/CTS), two McASPs, USB 2.0 OTG with PHY, and PRUSS dual real-time co-processors - deployed in industrial automation controllers requiring deterministic I/O and Linux-capable processing.
For engineers reviewing the AM1705BPTP4 datasheet, AM1705BPTP4 pinout, AM1705BPTP4 application, or AM1705BPTP4 equivalent, this page delivers verified specifications, package mapping to 176-pin HLQFP (PTP), validated peripheral integration, and direct alternative part comparisons for embedded system design and BOM optimization.
Technical Context
The AM1705BPTP4 implements an ARMv5TEJ-compliant 32-bit RISC core with MMU, enabling full Linux OS execution and memory protection. Its subsystem includes dual AHB buses, ETB-based trace capability, and CP15-controlled caches supporting write-back/write-through policies per memory region.
Peripheral integration follows a hierarchical bus architecture: EMAC and USB0 connect via dedicated AHB paths; EDMA3 manages 32 independent DMA channels across McASP, UART, SPI, and eHRPWM; PRUSS operates as a separate programmable real-time subsystem with 4KB instruction RAM per core and clock-gated power control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM926EJ-S at 375 MHz (1.2V core supply) - enables Linux 2.6+ boot with MMU support and Java bytecode acceleration. |
| Memory | 128KB on-chip SRAM + 16KB I-cache + 16KB D-cache + 64KB ROM - sufficient for bootloader, RTOS kernel, and real-time buffers without external RAM. |
| EMAC Interface | 10/100 Mbps Ethernet with RMII and MDIO - supports industrial Ethernet protocols (EtherNet/IP, Modbus TCP) using standard PHYs. |
| USB | USB 2.0 OTG with integrated PHY - allows host-mode connection to HID devices or client-mode attachment to PCs without external transceiver. |
| Real-Time Subsystem | PRUSS with two 32-bit RISC cores, 4KB IRAM + 512B DRAM each - offloads time-critical I/O (PWM, encoder, GPIO bit-banging) from ARM core. |
| Timers & PWM | Three eHRPWM modules (6 single-edge or 3 dual-edge asymmetric outputs) + three eCAP modules - supports motor control with dead-band generation and precise edge capture. |
| Package | 176-pin HLQFP (PTP), 24 mm × 24 mm, 0.5 mm pitch, PowerPAD™ thermal pad - requires standard QFP reflow profile and PCB thermal vias for 1.2V operation. |
Pinout & Package
AM1705BPTP4 uses a 176-pin PowerPAD™ plastic quad flat pack (HLQFP-PTP) with exposed thermal pad (pin 177). The package supports 3.3-V LVCMOS I/Os (except USB analog pins) and requires separate CVDD (core), DVDD (I/O), and RVDD (RTC) supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–40, 42–176 | Multi-function I/O (GPIO, UART, McASP, eHRPWM, eCAP, eQEP, SPI, I²C) | Configurable per pin-mux register; shared functions require software-defined priority (e.g., UART0_RXD/I2C0_SDA/GP5[8]). |
| 137–138 | USB0 differential pair (DP/DM) | Full-speed USB 2.0 physical layer; requires 90-Ω differential routing and 1.5-kΩ pull-up on DP for device mode. |
| 111–116, 118–120 | RMII interface (TXD[0:1], RXD[0:1], CRS_DV, RXER, TXEN, REFCLK) | Direct connection to RMII-compliant PHY (e.g., DP83848); no MII timing constraints or 25-MHz crystal needed. |
| 86, 108–110, 151 | EMIFB SDRAM signals (CLK, CS[0], RAS, CAS, D[0:15]) | Supports 16-bit SDRAM up to 128 MB; requires precise trace length matching and termination resistors per JEDEC spec. |
| 146 | RESET (active-low, synchronous) | Debounced reset input; initiates ARM vector table fetch from 0xFFFF 0000 and executes ROM bootloader. |
Key Features
| Feature | Design Value |
|---|---|
| ARM926EJ-S with MMU | Enables full Linux kernel execution, process isolation, and virtual memory management - critical for multi-tasking industrial HMI applications. |
| PRUSS dual-core subsystem | Provides deterministic <100 ns I/O response for encoder counting, PWM synchronization, and custom protocol bridging - independent of ARM OS latency. |
| EDMA3 controller | Offloads data movement from CPU for McASP audio streaming, UART DMA, and EMAC packet buffering - reduces ARM load by >40% in throughput-intensive tasks. |
| eHRPWM with dead-band | Generates complementary PWM pairs with programmable delay for 3-phase motor gate drivers - eliminates external dead-time ICs in servo drives. |
| Integrated USB 2.0 OTG PHY | Removes need for external USB transceiver; supports both host (keyboard/mouse) and device (firmware update) modes via software configuration. |
Applications
| Industrial PLC Controller | Networked HMI Terminal |
|---|---|
Use Scenario: Compact programmable logic controller executing ladder logic and motion control loops with fieldbus connectivity. IC Role / Device Role / Timing Role: Main processor running real-time Linux RT-Preempt, managing EtherCAT slave stack, and coordinating eQEP feedback from servo motors. Use Value: PRUSS handles high-frequency encoder sampling (1 MHz) while ARM runs UI and communication stacks - eliminating jitter in motion profiling. | Use Scenario: Touch-enabled operator interface with web server, local data logging, and remote diagnostics over Ethernet. IC Role / Device Role / Timing Role: Application processor executing Qt-based GUI, Apache web server, and SQLite database; EMAC and USB enable dual connectivity. Use Value: Integrated 128KB RAM stores firmware image and log buffer; McASP drives audio alerts without external codec. |
| Portable Data Collector | Test & Measurement Instrument |
Use Scenario: Battery-powered handheld scanner capturing barcodes, RFID tags, and sensor readings in warehouse environments. IC Role / Device Role / Timing Role: Central controller interfacing CMOS image sensor (via McASP or GPIO), NFC reader (via UART), and SD card (via MMC/SD interface). Use Value: Low-power 375-MHz ARM9 mode extends battery life; USB OTG allows direct PC sync without adapter cables. | Use Scenario: Benchtop oscilloscope or signal generator with analog front-end ADC/DAC and waveform display. IC Role / Device Role / Timing Role: Host processor for FFT computation, touchscreen UI, and USB/Ethernet data export; eCAP captures trigger events with nanosecond timestamping. Use Value: Three eCAP modules record up to four edge timestamps per event - enabling precise jitter analysis of input signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ARM microprocessor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM1808BPTP4 | 456-MHz ARM926EJ-S, 256KB on-chip RAM, enhanced security (AES, SHA, RNG), same PTP package | Required for higher throughput crypto operations or larger firmware images; not drop-in due to different memory map offsets | Select when cryptographic acceleration or extended RAM is mandatory; verify bootloader and peripheral driver compatibility. |
| AM3352BZCZ100 | ARM Cortex-A8 @ 1 GHz, 128KB L2 cache, PRU-ICSS (enhanced PRU), 384-pin BGA package | Higher performance for multimedia or complex UI; incompatible pinout and voltage sequencing - requires new PCB layout | Choose for next-generation designs needing >500 DMIPS or TI's Industrial SDK; not suitable for AM1705BPTP4 footprint replacement. |
Compared with AM1808BPTP4, AM1705BPTP4 offers lower power and cost for non-crypto industrial control; compared with AM3352BZCZ100, it provides proven stability and simpler thermal/power design in legacy QFP form factor.
Availability
AM1705BPTP4 is available at Aetrix Electronics and suitable for industrial automation controllers, networked HMI terminals, and portable data collection devices requiring stable component supply and long-term manufacturing continuity.
Supply support for AM1705BPTP4 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, embedded processing, and digital signal processing technologies.
The AM1705 belongs to TI's Sitara™ ARM microprocessor family, designed for cost-sensitive, low-power industrial and automation applications requiring real-time responsiveness, Linux support, and integrated connectivity.
FAQ
What is the maximum operating frequency of the AM1705BPTP4?
The AM1705BPTP4 operates at 375 MHz under 1.2-V core supply conditions. This frequency is specified in TI's SPRS657F datasheet revision January 2017 and validated across commercial and industrial temperature ranges. The AM1705BPTP4 does not support the 456-MHz variant - that speed grade corresponds to different part numbers (e.g., AM1705BPTP5). Running AM1705BPTP4 beyond 375 MHz violates electrical specifications and may cause instability.
Does the AM1705BPTP4 include an integrated Ethernet PHY?
No, the AM1705BPTP4 integrates only the Ethernet MAC (EMAC) with RMII interface - it requires an external RMII-compliant PHY (e.g., DP83848 or LAN8710A). The AM1705BPTP4 provides all necessary RMII signals (TXD[0:1], RXD[0:1], CRS_DV, RXER, TXEN, REFCLK) and MDIO management interface, but no analog PHY circuitry or 1.2-V USB PHY rails.
Can the PRUSS on the AM1705BPTP4 be used independently of the ARM core?
Yes, the PRUSS on the AM1705BPTP4 can operate autonomously: its two PRU cores execute code from dedicated 4KB instruction RAM and 512B data RAM per core, and are controlled via PSC clock gating. Software can disable PRUSS entirely to reduce power, or configure it to handle time-critical I/O (e.g., quadrature decoding) while the ARM core runs Linux - confirmed in Section 6.26 of the AM1705BPTP4 technical reference manual.
What boot sources are supported by the AM1705BPTP4?
The AM1705BPTP4 supports boot from NAND flash, NOR flash, MMC/SD card, UART, and USB via its internal ROM bootloader. Boot mode is selected using BOOT[0:15] pins (multiplexed with GPIO), and the ROM code validates image integrity before loading into RAM. This behavior is documented in Section 4.1 of the AM1705BPTP4 datasheet and applies specifically to the AM1705BPTP4 silicon revision 1.1 and later.
Is the AM1705BPTP4 pin-compatible with other Sitara processors like AM1808?
Yes, the AM1705BPTP4 is pin-compatible with the AM1808BPTP4 in the same 176-pin PTP package - both share identical pin assignments, power domains, and thermal pad layout. However, differences in memory map, peripheral register offsets, and boot ROM behavior require firmware adaptation; the AM1705BPTP4 cannot be substituted without software validation per TI's device compatibility guidelines.
AM1705BPTP4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 176-LQFP Exposed Pad
- Series:
- Sitara™
- Packaging:
- Tube
- Product Status:
- Obsolete
- Core Processor:
- ARM926EJ-S
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 456MHz
- 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:
- 0°C ~ 90°C (TJ)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 176-HLQFP (24x24)
- Additional Interfaces:
- I2C, McASP, SPI, MMC/SD, UART
AM1705BPTP4 FAQ
1.How can I place an order for AM1705BPTP4 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM1705BPTP4 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 AM1705BPTP4 reliable?
The price and inventory of AM1705BPTP4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM1705BPTP4 is usually 5 days.
3.What payment methods are accepted for AM1705BPTP4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM1705BPTP4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM1705BPTP4?
AM1705BPTP4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM1705BPTP4 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 AM1705BPTP4?
For technical support, including AM1705BPTP4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM1705BPTP4 requirements.
6.How does Aetrix verify that AM1705BPTP4 is sourced from the original manufacturer or authorized distributors?
All AM1705BPTP4 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 AM1705BPTP4 meets industry standards.
7.What is the process for return or replacement of AM1705BPTP4?
All AM1705BPTP4 units undergo pre-shipment inspection (PSI). If there is an issue with AM1705BPTP4, 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 AM1705BPTP4 part is unused and in its original packaging.
Return procedure for AM1705BPTP4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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