參數(shù)資料
型號(hào)： TLC320AD52C
廠(chǎng)商： Texas Instruments, Inc.
英文描述： Sigma-Delta Analog Interface Circuits With Master-Slave Function(帶主從功能的∑△模擬接口電路,高分辨率信號(hào)轉(zhuǎn)換)
中文描述： sigma - delta模擬接口電路的主從功能（帶主從功能的Σ△模擬接口電路，高分辨率信號(hào)轉(zhuǎn)換）
文件頁(yè)數(shù)： 32/59頁(yè)
文件大小： 306K
代理商： TLC320AD52C
3–2
3.2
Secondary Serial Communication
Secondary serial communication is used to read or write 16-bit words that program both the options and the
circuit configurations of the device. Register programming always occurs during secondary communication.
Four primary and secondary communication cycles are required to program the four registers. If the default
value for particular register is desired, then the register addressing can be omitted during secondary
communications. The NOOP command addresses a pseudo-register, register 0, and no register
programming takes place during this secondary communication. If secondary communication is desired for
any device (either master or slave), then a secondary communication must be requested for all devices,
starting with the master. This results in a secondary frame sync (FS) for all devices. The NOOP command
can be used for devices that do not need a secondary operation.
During a secondary communication, a register may be written to or read from. When writing a value to a
register, DIN contains the value to be written. When reading the value in a register, the data is stepped out
on DOUT.
There are two methods for initiating secondary communications:
1.
by asserting a high level on FC
2.
by asserting the LSB of the DIN 16-bit serial communication high while in the15-bit mode
Both methods are illustrated in figure 3–2.
Secondary
Request
16-Bit Mode
(Control 1 Register, Bit 0)
FC
(Hardware)
(LSB of DIN)
Internal TLC320AD50C
Figure 3–2. Hardware and Software Methods to Make a Secondary Request
FC should be pulled high before the rising edge of the frame sync (FS). This causes the start of the
secondary communication, 128 SCLKs after the start of the primary communication frame. If slaves are
present, FC should remain high until the rising edge of the frame sync for the last slave.
The second method for secondary communication is by asserting the LSB high. A software request is
typically used when the request resolution of the DAC channel is less 16 bits. Then the least significant bit
(D0) can be used for the secondary requests as shown in table 3–1. The request is made by placing the
device in the 15-bit DAC mode and making the LSB of DIN equal to 1. All devices should be in the 15-bit
DAC mode and secondary communication should be requested for all devices.
Table 3–1. Least Significant Bit Control Function
CONTROL BIT D0
CONTROL BIT FUNCTION
0
No operation (NOOP)
1
Secondary communication request
If a secondary communication request is made, FS goes low after 128 SCLKs after the beginning of the
primary frame.
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參數(shù)描述
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TLC320AD535C-I 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:DUAL CHANNEL VOICE/DATA CODEC
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