Texas Instruments CP3BT10G38

Overview

CP3BT10G38 from National Semiconductor is a reprogrammable connectivity processor integrating a 24 MHz CR16C RISC core, Bluetooth 1.1 Lower Link Controller, full-speed USB 1.1 node, 256 KB Flash program memory, 10 KB SRAM, and advanced audio interface - designed for embedded Bluetooth handheld and portable devices requiring compact size, low-voltage operation (2.5 V core / 2.5–3.3 V I/O), and multi-interface system integration.

For engineers reviewing the CP3BT10G38 datasheet, CP3BT10G38 pinout, CP3BT10G38 application, or CP3BT10G38 equivalent, this page delivers verified technical context, LQFP-100 package mapping, Bluetooth + USB co-processing capability, power management modes (Active/Idle/Halt/Power Save), and real-world use cases in Bluetooth headsets, USB peripheral bridges, and portable audio gateways.

Technical Context

The CP3BT10G38 implements a pipelined CR16C CPU core with zero-wait-state execution at up to 24 MHz, supported by on-chip PLL clock generation from a 12 MHz crystal and a dedicated 32.768 kHz slow clock for power management. Its Bluetooth LLC handles baseband timing, frequency hopping (1600 hops/s), and packet processing using 4.5 KB shared Bluetooth RAM and 1 KB sequencer RAM.

The USB 1.1 controller integrates a transceiver, Serial Interface Engine (SIE), and seven endpoint FIFOs (including bidirectional EP0), while the Advanced Audio Interface supports 8/13-bit PCM codecs and ISDN IOM-2 slave mode - all coordinated via a four-channel DMA controller and Multi-Input Wake-Up module with 16 configurable edge-triggered inputs.

Key Specifications

Pinout & Package

LQFP-100 (14 mm × 14 mm, 0.5 mm pitch), industrial temperature range (−40°C to +85°C), 2.5 V core supply, 2.5–3.3 V I/O voltage range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CSR BC417143 and CC2564C, the CP3BT10G38 uniquely integrates Bluetooth 1.1 LLC, full-speed USB 1.1, AAI, and 256 KB Flash in a single LQFP-100 package - making it the only viable monolithic solution for legacy USB-to-Bluetooth adapter designs requiring no external memory or host processor.

Availability

CP3BT10G38 is available at Aetrix Electronics and suitable for Bluetooth headset controllers, USB-to-Bluetooth adapters, portable audio gateways, industrial sensor hubs, and embedded voice communication systems requiring stable component supply across extended lifecycle windows.

Supply support for CP3BT10G38 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

National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011; its legacy connectivity products remain widely deployed in industrial and consumer systems.

The CP3BT10 product line was engineered specifically for embedded Bluetooth applications demanding tight integration of radio baseband, USB connectivity, audio processing, and real-time control - targeting handheld, portable, and battery-operated systems before the rise of modern BLE SoCs.

FAQ

What is the maximum operating frequency of the CP3BT10G38 CPU core?

The CP3BT10G38 features a CR16C RISC core rated for operation up to 24 MHz, achieving a minimum instruction cycle time of 41.7 ns when driven by the on-chip PLL using a 12 MHz external crystal. This frequency is confirmed in Section 2.0 (CPU Features) and the CP3BT10 Connectivity Processor Selection Guide, where CP3BT10G38 is explicitly listed with "Speed: 24 MHz".

Does the CP3BT10G38 include on-chip Flash memory for firmware storage?

Yes, the CP3BT10G38 integrates 256 KB of reprogrammable Flash program memory and 8 KB of Flash data memory. The program memory stores the Bluetooth protocol stack, real-time OS, and application code; the data memory retains user configuration settings. Both are in-system programmable without requiring external high-voltage programming circuitry.

Is the CP3BT10G38 compatible with Bluetooth 2.0 or later specifications?

No - the CP3BT10G38 implements Bluetooth Specification Version 1.1 only, as explicitly stated in Section 3.6 (Bluetooth LLC) and confirmed by its support for 1600 hops/s frequency hopping and baseband packet types defined in v1.1. It does not support EDR, Secure Simple Pairing, or later features introduced in Bluetooth 2.0+.

What package type and pin count does the CP3BT10G38 use?

The CP3BT10G38 is supplied in an LQFP-100 package (14 mm × 14 mm, 0.5 mm pitch), as documented in the CP3BT10 Connectivity Processor Selection Guide and Section 4.0 (Device Pinouts). This package provides access to all 37 GPIO pins, dual crystal interfaces, USB differential pair, Bluetooth RF control signals, and full external bus capability.

Can the CP3BT10G38 operate without an external 32.768 kHz crystal?

Yes - the CP3BT10G38 can derive its slow clock (32.768 kHz) from the main 12 MHz oscillator using an internal prescaler, making the external RTC crystal optional. This is confirmed in Section 3.9 (Triple Clock and Reset), which states: "The 32.768 kHz external crystal network is optional, because the low speed System Clock can be derived from the high-speed clock by a prescaler."