YAC523 Datasheet, PDF (7/16 Pages) YAMAHA CORPORATION – Electric Variable Resistance 2

YAC523
・Volume setting
The relationship between input code and volume value is as shown in the following table.
Input code
Gain or attenuate(dB)
11111111
11111110
・
・
11011111
・
・
10111111
・
・
00000010
00000001
00000000
MUTE
+31.5
・
・
+16.0
・
・
0
・
・
-94.5
-95.0
MUTE
The input codes ALL"0" and ALL"1" are set for mute.
・Zero-cross mode
YAC523 incorporates the zero-cross detection function to suppress audible noise when the volume is changed
quickly. A mode is selected from the following four modes by setting ZCEN1 and 2 pins.
ZCEN[2:1]
Mode
Operation
00
Normal
Zero-cross is not detected, and the volume value is changed
immediately after the rising of CSN.
01
Zero-cross mode A Zero-cross is detected after the rising of CSN, or after tTM1 (20ms)
passes, volume value is changed.
10
Zero-cross mode B Zero-cross is detected after the rising of CSN, or after tTM2 (10ms)
passes, volume value is changed.
11
Zero-cross mode C When the next data is written within tTM1 (20ms) for zero-cross mode
A, the changed is performed at the falling of CSN by using the volume
value immediately before.
t < tTM
&
No zero-cross
t < tTM
&
No zero-cross
t < tTM
&
No zero-cross
t < tTM
&
No zero-cross
t ≧ tTM
CSN
SDATAI
-12dB
-9dB
-6dB
-3dB
0dB
Volume value
(Zero-cross
-15dB(Last value)
0dB
mode A, B)
Volume value
(Zero-cross
-15dB(Last value)
-12dB
-9dB
-6dB
-3dB
0dB
mode C)
Operation in each zero-cross mode when zero-cross is not detected
˞Be careful not to change the zero-cross mode during the operation of the device, or an erroneous operation
may be caused. Perform change of zero-cross mode after the elapse of 1 second or more from the rising of
CSN signal.
・Power on reset
YAC523 builds in the power on reset function that resets the volume value when the power is turned on. Since
a system that perform the reset by detecting the power supply voltage level, when turning on the power supply
again, do it after the power supply voltage AVDD and AVSS has reduced sufficiently (to +1.0V/ -1.0V or less).
Moreover, although a volume register is reset at the time of a power supply injection, since shocking sound
occurs in the case of power supply ON/OFF, please apply mute to the whole set.
Power on reset is started when AVSS is 90%. At the time, AVDD should rise +1V or more. Since power-on
reset may be unable to be completed when conditions cannot be fulfilled, please perform a re-setup of a volume
register before canceling MUTE by the side of a set.
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