NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 46

• 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

The NAU8812 features two serial bus interfaces SPI and 2-Wire that provide access to the control registers. The
MODE pin in conjunction with SPIEN[8] (address 0x49) as shown in the following Table selects the control interfaces.
2-Wire interface is compatible with industry I
clock signal (SCLK). SPI interface is also compatible with other industry interfaces allowing operation on a simple 3-
wire or 4-wire bus. Table below describes the selection of the protocol modes.
The Serial Peripheral Interface (SPI) is one of the widely accepted communication interfaces implemented in
Nuvoton‟s Audio CODEC portfolio. SPI is a software protocol allowing operation on a simple 3-wire or 4-wire bus
where the data is transferred MSB first. NAU8812 has two different SPI architectures
The SPI interface consists of a clock (SCLK), chip select (CSb), serial data input (SDIO), and serial data output (SO)
to configure all the internal register contents. The SO Pin is ONLY available on the 32-Pin QFN package. SCLK is
static, allowing the user to stop the clock and then start it again to resume operations where it left off.
The 24-bit write operation consists of 8-bits of device address, 7-bits of control register address, and 9-bits of data.
The 32-bit read operation consists of 8-bits of device address, 8-bits of control register address, and 16-bits of data of
which 9 LSB bits are actual data bits and the rest are 0‟s.
The device address
emPowerAudio
Datasheet Revision 2.0
12.9.
12.9.1.
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


16-bit write ONLY (default)
24-bit write with 32-bit read
Write operation is 00010000b = 10h
Read operation is 00100000b = 20h
CONTROL INTERFACE
™
SPI Serial Control
MODE Pin
0
1
x
SPIEN[8] Bit
Table 26: Control Interface Selection
(0x49)
0
0
1
2
C serial bus protocol using a bidirectional data signal (SDIO) and a
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2-Wire Interface (Write/Read)
SPI Interface 16-bit (Write ONLY)
SPI Interface 32-bit (Read)
SPI Interface 24-bit (Write)
(SSOP 28-Pin Write ONLY,
QFN 32-Pin Write/Read)
Description
NAU8812
January 2011