SM5879AV Datasheet, PDF (14/20 Pages) Nippon Precision Circuits Inc – 3rd-order , 2-channel D/A Converter

SM5879AV
Microcontroller Interface
For microcontroller setting (when P/M is HIGH), the
microcontroller interface consisting of MDT (data),
MCK (clock) and MLEN (latch enable) can be used.
Data from the microcontroller is input to the input-
stage shift registers at the rise of MCK. Changes in
MDT should be performed at the rise of MCK.
Serial data in the shift registers is latched in parallel
to the flag registers at the rise of MLEN.
Two flag registers are available, divided into the
attenuation factor and mode flag by the D7 data.
MLEN
MCK
MDT
D0 D1 D2 D3 D4 D5 D6 D7
Figure 4. Format of microcontroller interface input
Table 2. microcontroller setting flags
Microcontroller
serial data
D7
D6
D5
D4
D3
D2
D1
D0
Flag
0
1
A6
-
A5
FDEM
A4
FBB1
A3
FBB2
A2
MONO
A1
CSEL
A0
-
A0 to A6: Attenuation factor (A6: MSB)
FDEM: Deemphasis ON/OFF (ON when 1)
FBB1: Bass boost setting switch flag 1
FBB2: Bass boost setting switch flag 2
MONO: Stereo/mono setting (Mono when 1)
CSEL: Mono output channel selection
(Right channel when 1)
NIPPON PRECISION CIRCUITS—14