3. TECHNICAL BRIEF
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3.8.5. Serial Bus Interface (SBI)
The MSM6275 device’s SBI is designed specifically to be a quick, low pin count control Protocol for
QUALCOMM’s RFL6202, RFR6202, RTR6250, RTR6200, and PM6650 ASICs.
Using the SBI, the RTR6250, RFR6200, RFL6200, and PM6650 devices can be configured for
different operating modes and for minimum power consumption, extending battery life in standby
mode. The SBI also controls DC baseband offset errors.
3.8.6. HKADC
The MSM6275 device has an on-chip 8-bit analog-to-digital converter (HKADC) which is Intended to
digitize DC signals corresponding to analog parameters such as battery voltage, temperature, and RF
power levels.
The MSM6275 device has seven analog input pins (HKAIN[5:0]) which are multiplexed to the input of
the internal HKADC.
3.8.7. Stereo Wideband CODEC
The MSM6275 device integrates a wideband voice/audio codec into the MSM. The codec supports two
differential microphone inputs, one differential earphone output, one single-ended earphone output,
and a differential analog auxiliary interface. The codec integrates the microphone and earphone
amplifiers into the MSM6275 device, reducing the external component count to just a few passive
components. The microphone (Tx) audio path consists of a two-stage amplifier with the gain of the
second stage set externally. The Rx/Tx paths are designed to meet the ITU-G.712 requirements for
digital transmission systems.
3.8.8. Vocoder Subsystem
The MSM6275 QDSP4000 supports AMR, FR, EFR, and HR. In addition, the QDSP4000 has modules
to support the following audio functions: DTMF tone generation, DTMF tone detection, Tx/Rx volume
controls, Tx/Rx automatic gain control (AGC), Rx automatic volume control (AVC), ear seal echo
canceller (ESEC), acoustic echo canceller (AEC), noise suppression (NS), and programmable, 13-tap,
Type-I, FIR, Tx/Rx compensation filters. The MSM6275 device’s integrated ARM9TDMI processor
downloads the firmware into the QDSP4000 and configures the QDSP4000 to support the desired
functionality.
3.8.9. General-Purpose Input/Output Interface
The MSM6275 device has general-purpose bidirectional input/output pins. Some of the GPIO pins
have alternate functions supported on them. The alternate functions include USB interface, additional
RAM, ROM, general-purpose chip selects, parallel LCD interface, and a UART interface. The function
of these pins is documented in the various software releases.
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