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SM5903CF Datasheet(PDF) 30 Page - Nippon Precision Circuits Inc

Part # SM5903CF
Description  compression and non compression type anti-shock memory controller
PDF  31 Pages
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Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5903CF Datasheet(HTML) 30 Page - Nippon Precision Circuits Inc

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NIPPON PRECISION CIRCUITS-30
SM5903CF
VDD pins
Deleted functions form SM5902AF
Microcontroller interface extensions
Microcomputer commands listed below are deleted from SM5902AF.
Compression mode switching
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
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
Attenuation function are deleted. In order not to
cause audio output noise, it is necessary to activate
Soft mute after DA converter.
Pin No.
SM5902AF
SM5903CF
7 pin
DIT
(N.C)
Device comparison with SM5902AF
Pin differences
Obsolete commands
Command
Bit
Name
Function
83H
D4
NS
Noise shaper ON/OFF switch
D5
SOFT
Soft muting ON/OFF switch
D7
ATT
Attenuator ON/OFF switch
84H
D0 to D7
K0 to K7
Attenuation level settings
86H
D4 to D7
Digital audio interface settings
87H
D0 to D11
Subcode Q data settings
91H
S3
QRDY
Q data write buffer status
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.



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