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Merlin Device Set Family
For 900 MHz and 2.4 GHz Digital Spread Spectrum Cordless Telephones
The Merlin family of device sets provides a cost-effective, feature-intensive systemlevel solution for 900 MHz and 2.4 GHz Digital Spread Spectrum (DSS) telephone technology. These devices represent the next generation of DSS system solutions, with support for Caller ID (CID) applications via Frequency Shift Keying (FSK) detection, and CPE Alert Signal (CAS) tone detection hardware and software; central office voice messaging via Stutter Dial Tone (SDT) detection and Visual Message Waiting Indication (VMWI); Integrated Telephone Answering Device (ITAD) via a real-time clock and seven-segment driver; and two-line applications via a second Codec and three independent Dual Tone Multi-Frequency (DTMF) generators. Increased firmware flexibility is provided by the new Application Programming Interface (API) firmware architecture. To match an Original Equipment Manufacturer’s (OEM’s) specific architectural needs, the Merlin family consists of six different mixed signal baseband ApplicationSpecific Integrated Circuits (ASICs) and a newly designed, performance-improved Codec to allow the lowest possible system cost: • • • • • • • Merlin Basic Merlin Custom with CID Merlin Custom without CID Merlin XROM with CID Merlin XROM without CID Merlin Flash Merlin Codec
Figure 3. Merlin XROM System Block Diagram
Merlin Device Descriptions
Merlin Basic _______________________________________ Merlin Basic is a 100-pin Monopac device that offers the most cost-effective, basic telephone design. The device contains all firmware needed to provide standard functionality, including dual keypad and speakerphone. It also continues to offer Conexant’s patented OEM Parameters option that allows OEMs to easily customize the product’s operation by setting bit fields in an optional external serial EEPROM device. Merlin Custom _____________________________________ Merlin Custom is a 100-pin Monopac device that offers 48 kB of ROM and 2 kB of RAM to allow OEMs to write custom firmware for higher-end models. To allow OEMs to optimize system cost, the device is available with or without the integrated CID feature support. Merlin XROM _______________________________________ Merlin XROM is a 128-pin standalone device that offers OEMs access of up to 59 kB of external ROM. It facilitates firmware development by providing access to ROM emulator control signals. This device can be used to achieve quick time to market with feature phones, and provides the OEM the flexibility of storing the firmware in an external memory device. This device is available with or without the CID feature and requires an external Merlin Codec device to complete the baseband device set. A typical Merlin XROM system block diagram is shown in Figure 3. Merlin Flash ________________________________________ Merlin Flash is a 100-pin PQFP. This ASIC allows an OEM to evaluate development firmware on a form, fit, and function prototype platform before sending code to Conexant for the purpose of creating a Merlin Custom ASIC. Merlin Codec _______________________________________ Merlin Codec is a 32-pin standalone Codec required by the Merlin XROM to form the baseband device set. The Merlin Codec is also required for a second Codec interface. Merlin Device Family Summary ________________________ Table 1 shows all of the features supported by each of the six ASICs in the Merlin family of spread spectrum devices. Table 2 lists the packaging types available for each of the six Merlin ASICs and the Merlin Codec device.
New Features
• Single development platform with family of baseband and RF components to build system solutions • Integrated CID with FSK/CAS detection and SDT detection • Two Codec interfaces • Three DTMF generators • Real-time clock • Seven-segment driver • API code structure • Improved performance Codec • 900 MHz and 2.4 GHz ISM band operation • Supports Australia and New Zealand RF bands (900 MHz only) • 2.7 to 3.3 V, low-power operation − 14-day standby (typical for 900 MHz and 2.4 GHz) − 5-hour talk time (typical for 900 MHz) − 4-hour talk time (typபைடு நூலகம்cal for 2.4 GHz) • Complete telephone API firmware provided for feature customization
Supported Models
− − − − − − Basic telephone Dual keypad Caller ID (types 1, 2, and 2.5) Message Service Support (VMWI, SDT) Speakerphone External ITAD