SM5903CF Datasheet, PDF (30/31 Pages) Nippon Precision Circuits Inc – compression and non compression type anti-shock memory controller

SM5903CF
Device comparison with SM5902AF
Pin differences
Pin No.
7 pin
SM5902AF
DIT
SM5903CF
(N.C)
VDD pins
SMl5902AF has a built-in level shifter to use 5V
DARM during IC operation with 3V, therefore, it has
2 electrical power terminals. VDD 1 is an electrical
power terminal used for internal ICs and VDD 2 is
an electrical power terminal used for external
DRAM interface. Regarding SM5903CF, VDD can’t
be set to other voltage due to the different process-
ing. Therefore, make sure to set VDD 1 and VDD 2
to the same voltage.
Deleted functions form SM5902AF
1) DIT function
2) Digital attenuator function
3) Soft mute function
4) Noise shaper function during compress encoding
5) Compression mode switching function during
shock proof operation
Microcontroller interface extensions
Microcomputer commands listed below are deleted from SM5902AF.
Obsolete commands
Command
Bit
83H
D4
D5
D7
84H
D0 to D7
86H
D4 to D7
87H
D0 to D11
91H
S3
Name
NS
SOFT
ATT
K0 to K7
QRDY
Function
Noise shaper ON/OFF switch
Soft muting ON/OFF switch
Attenuator ON/OFF switch
Attenuation level settings
Digital audio interface settings
Subcode Q data settings
Q data write buffer status
Compression mode switching
Compression mode switching using 85 H command
of SM5903CF can’t be changed during shockproof
operation. In order to switch compression mode, it
is necessary to change it to “through-mode” first
and change the compression mode setting, then
again set shock- proof mode ( Detailed switching
procedure is available ).
Attentions
About SM5903CF, Soft mute function and cause audio output noise, it is necessary to activate
Attenuation function are deleted. In order not to Soft mute after DA converter.
NIPPON PRECISION CIRCUITS-30