K630 - V640 - K660
1215-3608 rev. 1
FUNCTIONAL OVERVIEW
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CODEC Block Schematic
CODEC CCO Voltage Source
There is an internal voltage source CCO that provides the necessary drive current for
electret microphones. The voltage source is I²C programmable to 2.2 V or 2.4 V. The
source can be disabled during standby. A typical use case with a microphone connected
to MIC1 and the CCO is shown in
picture below.
Earphone Amplifier
The earphone amplifiers (BEARP and BEARN) are mainly intended to be differentially
configured and drive a low impedance dynamic transducer (earpiece) but they can also
be single ended configured. The BEARP and BEARN amplifiers can be powered down by the I2C.
The amplifiers can exhibit high impedance to 1.4 V or low impedance to ground when powered-
down. Fifty-one gains are available for BEARP and BEARN: from +15 dB down to –60 dB in
1.5 dB steps. When the BEARP and BEARN outputs are operating in differential mode, an I²C
selectable bit must invert one of the inputs.
Technical Description
SEMC Troubleshooting Manual
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