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| DECT Digital Circuit for Handhelds PMB 27201/2 General Description The DECT-Digital Circuit for Handhelds is one of the devices of the Siemens chip set for the digital cordless telephone specified by the DECT standard. The device designed for cordless handhelds is a highly integrated circuit and realizes most of the system functions needed in such an equipment. The circuit contains a digital signal processor, an 8-bit 80C51-compatible microcontroller and the burst mode controller. Furthermore the circuit handles the interfacing of the different components of the DECT chipset and feature LCD controller. The device is fabricated using Siemens advanced CMOS technology and will be available in a 128 pin package. Further baseband controllers are PMB 27221 (romless version with 4 K RAM). Type PMB 27201/2 Features * * * * * * * * * * * * * Package P-TQFP-128-1 (SMD) 8-bit C with integrated ROM/RAM Integrated LCD controller 32-kbit/s ADPCM-transcoder Digital filtering and gain stages Burst mode controller Power-down mode programmable Low voltage detection Power supply 3.0 ... 5.1 V Low power consumption Advanced low power CMOS technology Encryption PMB 27201: 64 K ROM, 4 K RAM PMB 27202: 48 K ROM, 2 K RAM Data Port (32 kbit/s) Crystal 10.368 MHz DSP Clocks Input Data RAM Timers / RF-Interf. Serial In CRC Synchronization Descramble TDMA Data 1.152 Mbit/s Scramble Speech Data (PMB 2920) Interpolation Decimation Codec Filter ADPCM Transcoder Control RAM Output Data RAM Serial Out Control RAM CRC Encryption Decryption Power Control Burst-Error-Concealment Tone Generation Burst-Mode-Logic Internal ROM 48 kBytes 8-Bit CPU Internal RAM 2 kBytes Timers Port X Keypad Port Y Keypad LCD-Drivers Interrupts Port 0 Addit. D A I 2 C Bus RSSI Battery Control Microcontroller Unit Watchdog ITB08460 Block Diagram PMB 27202 Siemens Aktiengesellschaft 1 |
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