SM5903BF Nippon Precision Circuits Inc, SM5903BF Datasheet - Page 30

• Manufacturer Part Number: SM5903BF
• Description: compression and non compression type shock-proof memory controller
• Manufacturer: Nippon Precision Circuits Inc

Device comparison with SM5902AF
1) DIT function
2) Digital attenuator function
3) Soft mute function
Pin differences
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
Deleted functions from SM5902AF
Microcontroller interface extensions
Microcomputer commands listed below are deleted from SM5902AF.
Compression mode switching
Compression mode switching using 85 H command
of SM5903BF can’t be changed during shockproof
operation. In order to switch compression mode, it
is necessary to change it to “through-mode” first
Attentions
About SM5903BF, Soft mute function and
Attenuation function are deleted. In order not to
Obsolete commands
Command
Pin No.
7 pin
83H
84H
86H
87H
91H
D0 to D11
D0 to D7
D4 to D7
SM5902AF
D4
D5
D7
Bit
S3
DIT
K0 to K7
QRDY
Name
SOFT
ATT
NS
SM5903BF
(N.C)
SM5903BF
4) Noise shaper function during compress encoding
5) Compression mode switching function during
and change the compression mode setting, then
again set shock- proof mode ( Detailed switching
procedure is available ).
cause audio output noise, it is necessary to activate
Soft mute after DA converter.
DRAM interface. Regarding SM5903BF, 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.
shock proof operation
Digital audio interface settings
Noise shaper ON/OFF switch
Soft muting ON/OFF switch
Attenuator ON/OFF switch
Q data write buffer status
Attenuation level settings
Subcode Q data settings
Function
NIPPON PRECISION CIRCUITS-30