NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 56

• Manufacturer Part Number: NAU8812EVB
• Description: BOARD EVAL FOR NAU8812
• Manufacturer: Nuvoton Technology Corporation of America
• Series: emPowerAudio™r

Specifications of NAU8812EVB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In PCM Time-Slot interface (normal mode), the left channel serial audio data is synchronized with the frame sync.
Left channel data is transferred during the LOW frame sync. The MSB data is sampled first. The starting point of the
timeslot is controlled by a 10-bit byte TSLOT[9:0] address (0x3B and 0x3C). The data is latched on the first rising
edge of BCLK following a frame sync transition (FS) providing PCM is in timeslot zero (TSLOT[9:0] = 000). PCM
Time-Slot format is selected by setting AIFMT[4:3] address (0x04) to “11” binary in conjunction with PCMTSEN[8]
address (0x3C) set to HIGH. The digital data can be forced to appear on the right phase of the FS by setting
ADCPHS[0] and DACPHS[1] address (0x04) bits to HIGH respectively. The starting point of the right phase data
depends on the word length WLEN[6:5] address (0x04) and timeslot assignment TSLOT[9:0] address (0x3B and
0x3C) after the frame sync transition (FS). DACIN will return to the bus condition 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 TRI[7] address
(0x3C). Tri-stating on the negative edge allows the transmission of data by multiple sources in adjacent timeslots
without the risk of driver contention.
NAU8812 features a special mode where the device outputs Left channel data to both Left and Right channels. This
is accomplished by setting LOUTR[2] address (0x3C) to “1”
emPowerAudio
Datasheet Revision 2.0
12.10.5. PCM Time Slot audio data
ADCOUT
DACIN/
ADCOUT
BCLK
BCLK
FS
™
FS
1 BCLK
1 BCLK
MSB
MSB
1
Word Length, WLEN[6:5]
1
Word Length, WLEN[6:5]
Figure 39: PCM Time Slot Mode (Time slot = 0) (Normal Mode)
Figure 40: PCM Time Slot Mode (Time slot = 0) (Special mode)
2
2
LEFT CHANNEL
LEFT CHANNEL
N-1 N
N-1 N
LSB
LSB
MSB
1
Word Length, WLEN[6:5]
Page 56 of 109
RIGHT CHANNEL
2
N-1 N
LSB
NAU8812
January 2011