w682510 Winbond Electronics Corp America, w682510 Datasheet - Page 12

• Manufacturer Part Number: w682510
• Description: Voice Codec
• Manufacturer: Winbond Electronics Corp America

This pin carries the signal ground voltage level and requires a bypass capacitor. A 0.1μF ceramic
(with low ESR for good high frequency response) capacitor needs to be connected between the V
pin and the V
Power up input signal. When the PUI pin is set to logic “0” level, the CODEC will go into power down
mode.
The PCM interface is controlled by pins PCMMS, BCLK, FSR & FST. The input data is received
through the PCMR pin and the output data is transmitted through the PCMT pin. The modes of
operation of the interface are shown in Table 7.2.
This pin selects the desired companding law. The CODEC will operate in the μ-law when this pin is at
a logic “0” level and in the A-law when at a logic “1” level. The CODEC operates μ-law if the pin is left
open, since this pin is internally pulled down.
PCMMS
7.4. PCM I
[HIGH]
[LOW]
V
V
7.3.4. V
7.3.5. PUI
7.4.1. μ/A-Law
DD
SS
REF
NTERFACE
REF
pin.
PCM Mode
Parallel
Mode
Serial Mode
TABLE 7.25: PIN-SELECTABLE COMPRESSION FORMAT
LOW (V
TABLE 7.2: PCM INTERFACE MODE SELECTIONS
μ/A-Law pin
HIGH (V
Data Available
CH1 data on PCMT1 & PCMR1
CH2 data on PCMT2 and PCMR2 (same timing as CH1)
CH1 data followed by CH2 receive data on PCMR2 (total 16 bits)
CH1 data followed by CH2 transmit data on PCMT1 (total 16 bits)
SS
), Floating
DD
)
- 12 -
Format
A-Law
μ -Law
W682510/W682310
SSA