参数资料
型号: WLA49VVA
厂商: National Semiconductor Corporation
元件分类: ADC
英文描述: Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
中文描述: 音频子系统的双模单声道立体声耳机和扬声器放大器的高效率和多功能模数转换器
文件页数: 24/112页
文件大小: 5017K
代理商: WLA49VVA
11.0 System Control (Continued)
Method 2. SPI/Microwire Control/3–wire Control
The LM4935 can be controlled via a three wire interface consisting of a clock, data and an active low chip_select. To use this
control method connect SPI_MODE to BB_V
DD and use TEST_MODE/CS as the chip_select as follows:
If the application requires read access to the register set; for example to determine the cause of an interrupt request or to read
back a SAR data field, the GPIO2 pin can be configured as an SPI format serial data output by setting the GPIO_SEL in the GPIO
configuration register (0x1Ah) to SPI_SDO. To perform a read rather than a write to a particular address the MSB of the register
address field is set to a 1, this effectively mirrors the contents of the register field to read-only locations above 0x80h:
20134106
FIGURE 3. SPI Write Transaction
20134107
FIGURE 4. SPI Read Transaction
Three Wire Mode Write Bus Timing
20134109
FIGURE 5. SPI Timing
LM4935
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