N681622YG Nuvoton Technology Corporation of America, N681622YG Datasheet - Page 65

• Manufacturer Part Number: N681622YG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of N681622YG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

The PCMT pin is high impedance except for the duration of the PCM transmit. PCMT will return to high impedance
either on the negative edge of BCLK during the LSB, or on the positive edge of BCLK following the LSB depending
on the setting of PCMC:TRI[2] address (0x00). Tri-stating on the negative edge allows the transmission of data by
multiple sources in adjacent timeslots without the risk of driver contention.
Nuvoton’s newest design in the Pro-X product line is a Narrowband and Wideband audio codec. The N681386 is
limited to Narrowband audio codec communication, meaning 8kHz sampling and 8kHz frame sync with frame sync
master mode capability. The Narrowband audio codec communication is compatible with the W681388, N681386, &
W684386. The user could write to a reserved register that is used for Wideband operation on N681386 without any
effect to the Narrowband operation.
The N681387 is capable of both Narrowband and Wideband audio communication. The WBAND pin which is only
available on N681387 selects the Narrowband and Wideband.
narrowband mode and when the WBAND pin is HIGH the devices is operating in Wideband mode. However, a
register PCMFS:WBEN[1] address (0x05) also needs to be programmed to ‘1’ in order to enable wideband operation.
This supports two scenarios:
The table below shows the modes of operation.
The Narrowband mode is limited to 8kHz sampling and frame sync of 8kHz. The Wideband mode of operation is
limited to 16kHz sampling and an option of 8kHz or 16kHz frame sync.
PLLS:FSRATE[5] address (0x04) to indicate whether 8kHz (‘0’) or 16kHz (‘1’) frame sync rate is being used.
There is no frame sync master mode supported in wideband operation.
Preliminary Datasheet Rev1.0
1)
2)
The user permanently ties the ‘WBAND’ pin to VDD, while the PCMFS:WBEN[1] address (0x05) register is
toggled to enable/disable Wideband
The user sets the register PCMFS:WBEN[1] address (0x05) to ‘1’ and controls the WBAND pin to
enable/disable the Wideband operation.
WBANDPin
12.2.2.1.
GND
GND
VDD
VDD
WIDEBAND AND NARROWBAND OPERATION
Table 29: Wideband or Narrowband Hardware Selection
WBEN[1]
0
1
0
1
Page 65 of 164
FSRATE[5]
0
0
1
Single Programmable Extended Codec/SLCC
(1 FS with 1Sample)
When WBAND pin is LOW the device is in
FS Frequency
(1 FS with 2
Sample)
16kHz
8kHZ
8kHz
The user needs to write a register
Narrow (Default)
Band Operation
N681386/87
(Filter & PCM)
Narrow
Narrow
Wide
January 2010