YDA136 Datasheet, PDF (15/32 Pages) YAMAHA CORPORATION – D- 60 STEREO 60W-100W DIGITAL AUDIO POWER AMPLIFIER CONTROLLER

YDA136
■MPU Interface Function
By using the following three terminals “CSN, MCLK, and VDI”, data is written into Volume register and Control register.
In case of writing data in the Control register, be sure to set mute to Volume register in advance. After a write of Control
register or after the given time (T_ZERO, T_CF, T_OSFN, T_MOD, and T_FS), be sure to cancel mute condition.
●Input Format
Please input the data of each 14-bit register into a VDI terminal in MSB first following address bits. The data input from
VDI terminal is taken into internal shift register at the rising edge of MCLK terminal when CSN terminal is “L.” The data
input into shift register is written into the register of the appointed address at the rising edge of CSN terminal.
All the values of registers after a power up are set to “0.”
After a power supply starting, the MPU interface works after passing over a serial access prohibition time (T_PUP).
Be sure to perform a power supply staring first, and then perform a write of the data to a register after a serial access
prohibition time (T_PUP).
CSN
MCLK
VDI
A1 D1[13] D1[12] D1[11] D1[10] D1[9]
D1[2] D1[1] D1[0]
VDO
A0 D0[13] D0[12] D0[11] D0[10] D0[9]
D0[2] D0[1] D0[0] A1
Here, A1 and D1 [13:0] indicates a register to update and data. In addition, A0 and D0 [13:0] indicates a data input into
VDI terminal before 16-clock.
●Daisy-chain
Multiple Daisy-chain connections for multi-channel system are available in YDA136. For example, 6ch system can be
realized by connecting three YDA136 with Daisy-chain connection.
By connecting a VDO terminal of first YDA136 to VDI terminal of the second YDA136; and then, connecting a VDO
output of second YDA136 to a VDI terminal of the third YDA136, it becomes available to control those three YDA136
simultaneously without a complex addressing.
The data in which it overflowed from the internal 15-bit shift register among the data inputted into each VDI terminal of
YDA136 is output from a VDO terminal synchronizing with falling edge of a MCLK terminal.
By setting CSN terminal to “L” during the number of YDA136×15-clock which daisy-chain connection was made, an
input data is taken into each shift register of YDA136.
Then, writing is simultaneously performed to a volume register (control register) from the shift register of all YDA136
connected to the daisy-chain by setting the CSN terminal of YDA136 to “H.”
MPU
MCLK and CSN are connected 3 chips in common.
YDA136_A
VDI
VDO
YDA136_B
VDI
VDO
YDA136_C
VDI
VDO
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