DMR/dPMR Processor with Analog Mode
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Product Description

SCT3258 is a low power high performance base band processor supporting DPMR and DMR protocol. With an external codec (audio band ADC and DAC), it completes the entire physical layer and data link layer, and most of the call control layer processing of DPMR and DMR protocol.

In DPMR mode, SCT3258 complies with ETSI TS 102 490 and ETSI TS 102 658.

In DMR mode, it complies with ETSI TS 102 361.

SCT3258 is designed for easy migration from analog radios. The system designer can start with a typical analog radio, replacing the analog base band processor with SCT3258 together with an external codec, to obtain the simplest form of a DPMR or DMR radio. To achieve the full potential of DPMR or DMR, application level software programming is required on the host processor.

SCT3258 contains two high-speed serial ports, a single 8-bit processor interface (HPI), and a 4-pin programmable I/O port. The two serial ports are used for connection with external codec and external vocoder.

SCT3258 communicates with host processor with 8 bit HPI port (Intel Mode or Motorola Mode).

The firmware of SCT3258 is stored on chip. At the start of the system, the host processor downloads a small boot loader to SCT3258 to get SCT3258 started. SCT3258 then loads the entire firmware and starts execution.

SCT3258 core logic operates at 1.2 V, and the I/O operates at 2.5-3.3V. SCT3258 is packaged in 64-pin QFN.


  • Support DPMR Tier 1 (ETSI TS 102 490), Tier 2 (ETSI TS 102 658) Mode 1 & 2
  • Support DMR Tier 1 and Tier 2 (ETSI TS 102 361)
  • Air interface Physical Layer (Layer - 1), Data Link Layer (Layer - 2) & Call Control Layer (Layer - 3)
  • Air interface Physical Layer (Layer - 1), Data Link Layer (Layer - 2) & Call Control Layer (Layer - 3)
  • 4FSK Modem supports 4800bps (DPMR) and 9600bps (DMR)
  • Suppoort two-point modulation & I/Q modulation
  • Built-in AMBE + 2, AMBE + 2C Vocoder from DVSI (no security key)
Voltage:1.1 to 1.3 VDC (Core, PLL) 2.5 to 3.6 VDC (I/O)
Form factor:64-pin VQFN
Temperature:-40 to +85 °C
Dimensions:9.0 x 9.0 x 0.75 mm
Current:42.5 mA (Full Duplex)
Signal IO format:4-level FSK
Baud Rate:4800, 9600
C-BUS (SPI) Control Interface:yes