CM109 Datasheet, PDF (10/36 Pages) C-Media Electronics – USB I/O Controller

CM109
High Integration / Low Cost USB Audio Controller
for PC Internet Phone
Note: DI – Digital Input Pad, DO – Digital Output Pad, DIO – Digital bi-Directional Pad, AI/AO/AIO – Analog
Pad, SR Slew Rate Control, ST – Schmitt Trigger, PD/PU – Pull Down or Pull Up, 5VT – 5 Volt Tolerant
(3.3V Pad), OD – Open Drain
4. MCU INTERFACE
CM109 provides a serial MCU Interface for external MCU to access internal registers with
these registers access. MCU and host side software can have bi-directional
communication. This interface can keep flexibility for external module control and
integrate, such as LCD panel.
5. BLOCK DIAGRAM
REGV
PWRSEL
MODE
PDSW MSEL
5 -> 3.3
regulator
3.3V
CS
SK
DW
DR
USBDP
USBDM
EEPROM
interface
USB
interface
USB
TRX
12 MHz
48 MHz
PLL1
clock
gen
VOLUP
VOLDN
MUTER LEDO MCU
MUTEP LEDR I/F GPIO BUZZ SPDIFO
USB control
interface logics
ISO out
processing
ISO in
processing
SRAM
reset power on
reset
16 bit
DAC
16 bit
DAC
VREF ⁺
0 ~ -45dB
38 steps
0 ~ -45dB
38 steps
LOBS
LOL
LOR
+12 ~ -33 dB
32 steps
16 bit ADC
+22.5 ~ 0 dB
16 steps
MICIN
+20dB boost enable
VREF
(2.25V)
bandgap
4.5V
VREF
VBIAS
Block Diagram Of CM109
Date: 08/Sep/2005
-9-
Version: 1.3a