Texas Instruments AM1705CPTP4

Overview

AM1705CPTP4 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-core real-time subsystem - deployed in industrial automation and portable data terminals.

For engineers reviewing the AM1705CPTP4 datasheet, AM1705CPTP4 pinout, AM1705CPTP4 application, or AM1705CPTP4 equivalent, key selection considerations include ARM926EJ-S core frequency (375 MHz @ 1.2 V), 176-pin PTP package with 0.5-mm pitch, EMIFA/EMIFB memory interface support, and PRUSS programmability for deterministic I/O offload.

Technical Context

The AM1705CPTP4 implements an ARMv5TEJ-compliant ARM926EJ-S core with MMU, separate 16KB I-cache and D-cache (4-way VIVT), 8KB vector RAM, and 64KB ROM. Its memory subsystem includes 128KB SRAM, EMIFA supporting NAND/NOR/8-bit async, and EMIFB for 16-bit SDRAM up to 128 MB.

Peripherals are tightly coupled via AHB/APB buses: EDMA3 with 32 independent channels manages high-throughput transfers; PRUSS provides two 32-bit RISC cores (4KB IRAM + 512B DRAM each) for real-time GPIO, PWM, or protocol handling; and dual McASPs support TDM/I2S with 28 serial data pins and FIFO buffering.

Key Specifications

Pinout & Package

AM1705CPTP4 uses a 176-pin PowerPAD™ plastic quad flat pack (HLQFP-PTP) with 0.5-mm pitch and exposed thermal pad (pin 177). The package supports industrial temperature range (–40°C to 105°C) and requires controlled solder reflow per TI SZZA031.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor applications.

Compared with AM1705CPTP4, AM1707CPTP4 delivers +21.6% CPU frequency at higher voltage, while AM1808CPTP4 trades EMIFB SDRAM compatibility for hardware crypto and DDR2 - making AM1705CPTP4 optimal for cost-sensitive industrial control where 375 MHz and SDRAM are sufficient.

Availability

AM1705CPTP4 is available at Aetrix Electronics and suitable for industrial automation, portable data terminals, and test and measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AM1705CPTP4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.

The AM1705CPTP4 belongs to TI's Sitara™ ARM processor family, designed for cost-optimized, low-power industrial applications requiring real-time responsiveness, rich peripheral integration, and Linux-capable processing without DSP co-processing.

FAQ

What is the maximum operating frequency of the AM1705CPTP4?

The AM1705CPTP4 operates at a maximum frequency of 375 MHz when supplied with a nominal 1.2-V core voltage. This frequency is specified under recommended operating conditions and validated across the industrial temperature range (–40°C to 105°C). The AM1705CPTP4 does not support the 456-MHz configuration - that variant is implemented in the AM1707CPTP4. System-level timing must account for PLL lock time and clock domain crossings between ARM, PRUSS, and peripheral modules.

Does the AM1705CPTP4 include an integrated USB PHY?

Yes, the AM1705CPTP4 integrates a full-speed USB 2.0 OTG PHY on-die, supporting both client (device) and host modes at 12 Mbps. It includes dedicated pins (USB0_DP, USB0_DM, USB0_VDDA33, USB0_VDDA12, USB0_VDDA18) and complies with USB 2.0 specification for electrical signaling. No external PHY is required, reducing BOM cost and board area. The USB controller supports endpoint 0 (control) and endpoints 1–4 (bulk/interrupt/isochronous) in both directions.

How many independent PWM outputs does the AM1705CPTP4 support?

The AM1705CPTP4 features three enhanced high-resolution PWM (eHRPWM) modules, capable of generating up to six single-edge, six dual-edge symmetric, or three dual-edge asymmetric PWM outputs. Each module includes dedicated 16-bit time-base counters, period/frequency control, dead-band generation, and trip-zone inputs for safety-critical motor control. These outputs are routed to specific GPIO pins (e.g., EPWM0A/B, EPWM1A/B) and require proper pin multiplexing configuration via the SYSCFG module.

What memory interfaces are supported by the AM1705CPTP4?

The AM1705CPTP4 supports two external memory interfaces: EMIFA (asynchronous interface for 8-bit NAND/NOR flash, SRAM, and FPGA peripherals) and EMIFB (synchronous 16-bit SDRAM interface supporting up to 128 MB address space). EMIFA includes chip selects CS2–CS5 and wait-state control; EMIFB supports standard SDRAM timing parameters (tRCD, tRP, tRFC) and includes dedicated DQM/WE/CAS/RAS signals. Both interfaces are accessible via AHB bus and require initialization through the EMIF controller registers.

Is the PRUSS subsystem in the AM1705CPTP4 enabled by default?

No, the PRUSS subsystem in the AM1705CPTP4 is disabled by default after reset and must be explicitly enabled via software configuration of the Power and Sleep Controller (PSC) registers. Once enabled, each PRU core executes independently from the ARM926EJ-S, accessing its own 4KB instruction RAM and 512B data RAM. PRUSS operation requires clock gating control, interrupt routing setup, and shared resource arbitration - all documented in the AM1705 Technical Reference Manual sections 6.26 and 3.3.6.