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參數(shù)資料
| 型號： | XWM8711EDS |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Internet Audio DAC with Integrated Headphone Driver |
| 中文描述： | 互聯(lián)網(wǎng)音頻DAC集成耳機(jī)驅(qū)動器 |
| 文件頁數(shù)： | 26/36頁 |
| 文件大?。?/td> | 379K |
| 代理商： | XWM8711EDS |
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WM8711
Product Preview
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 November 2000
26
SDIN
SCLK
ACK
R ADDR
ACK
DATA B15-8
STOP
START
DATA B7-0
R/W
ACK
Figure 20 2-Wire Serial Interface
Notes:
1.
B[15:9] are Control Address Bits
2.
B[8:0] are Control Data Bits
CSB STATE
(DEFAULT = LOW)
0
1
Table 18 2-Wire MPU Interface Address Selection
ADDRESS
0011010
0011011
To control the WM8711 on the 2-wire bus the master control device must initiate a data transfer by
establishing a start condition, defined by a high to low transition on SDIN while SCLK remains high.
This indicates that an address and data transfer will follow. All peripherals on the 2-wire bus respond
to the start condition and shift in the next eight bits (7-bit address + R/W bit). The transfer is MSB
first. The 7-bit address consists of a 6-bit base address + a single programmable bit to select one of
two available addresses for this device (see Table 18). If the correct address is received and the R/W
bit is
‘
0
’
, indicating a write, then the WM8711 will respond by pulling SDIN low on the next clock pulse
(ACK). The WM8711 is a write only device and will only respond to the R/W bit indicating a write. If
the address is not recognised the device will return to the idle condition and wait for a new start
condition and valid address.
Once the WM8711 has acknowledged a correct address, the controller will send eight data bits (bits
B[15]-B[8]). WM8711 will then acknowledge the sent data by pulling SDIN low for one clock pulse.
The controller will then send the remaining eight data bits (bits B[7]-B[0]) and the WM8711 will then
acknowledge again by pulling SDIN low.
A stop condition is defined when there is a low to high transition on SDIN while SCLK is high. If a
start or stop condition is detected out of sequence at any point in the data transfer then the device
will jump to the idle condition.
After receiving a complete address and data sequence the WM8711 returns to the idle state and
waits for another start condition. Each write to a register requires the complete sequence of start
condition, device address and R/W bit followed by the 16 register address and data bits.
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相關(guān)代理商/技術(shù)參數(shù) |
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| XWM8721EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Internet Audio DAC with Integrated Headphone Driver |
| XWM8721EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Internet Audio DAC with Integrated Headphone Driver |
| XWM8722EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| XWM8728EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control |
| XWM8728EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control |
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