¡ Semiconductor
MSM7586-01/03
14/42
IO1 to IO7
I/O pins of the internal analog switch.
Refer to the control register description table (CRC5) and the block diagram for connection
information and control methods.
TOUT1 to TOUT3
Sign bit output pins of the tone generator.
Output control of each pin is performed by the control register. Refer to the control register
description table (CRC5) and the block diagram for connection information and control methods.
SGCT, SGCR
Output pins of the CODEC unit analog signal ground voltage.
SGCT outputs the analog signal ground voltage of the transmit system, and SGCR outputs the
same for the receive system. The output voltage value is approximately 1.4 V. Connect 10
m
F and
0.1
m
F bypass capacitors (ceramic type) between these pins and the AGC pin. During power
down, the output changes to 0 V. The external SG voltage if necessary should be used via a buffer.
VDDC, VDAC
CODEC unit +3 V power supply.
VDDC is supplied to the digital system power supply, and VDAC is supplied to the analog
system power supply. VDDC and VDAC, and VDDM and VDAM must be connected as possible
on the PC board.
DGC, AGC
CODEC unit ground.
DGC is the digital system ground pin, and AGC is the analog system ground pin. Since DGC and
AGC are unconnected in the device, place them as close together as possible on the circuit board.
PDN3
CODEC unit power-down control input.
The CODEC unit changes to the power - down state when set to a digital "0." Since the power-
down control is handled by an OR with control register CRC0 - B5, set CRC0 - B5 to digital "0"
when using this pin.
RESET
Reset control input pin of the CODEC unit control register.
When set to digital "0," each bit of the control register is reset. During normal operation, set this
pin to digital "1." A more than 200ns reset signal should be input.
