ZHCSIJ3C June 2008 – July 2018 ADS7950 , ADS7951 , ADS7952 , ADS7953 , ADS7954 , ADS7955 , ADS7956 , ADS7957 , ADS7958 , ADS7959 , ADS7960 , ADS7961
PRODUCTION DATA.
请参考 PDF 数据表获取器件具体的封装图。
There are three modes for channel sequencing, namely Manual mode, Auto-1 mode, Auto-2 mode. Mode selection is done by writing into the Mode Control Register (refer to Table 1, Table 2, and Table 5). A new multiplexer channel is selected on the second falling edge of SCLK (as shown in Figure 1) in all three modes.
Manual mode: When configured to operate in Manual mode, the next channel to be selected is programmed in each frame and the device selects the programmed channel in the next frame. On powerup or after reset the default channel is 'Channel-0' and the device is in Manual mode.
Auto-1 mode: In this mode the device scans pre-programmed channels in ascending order. A new multiplexer channel is selected every frame on the second falling edge of SCLK. There is a separate Program Register for pre-programming the channel sequence. Table 3 and Table 4 show Auto-1 ‘program register’ settings.
Once programmed the device retains ‘Program Register settings until the device is powered down, reset, or reprogrammed. It is allowed to exit and re-enter the Auto-1 mode any number of times without disturbing ‘program register’ settings.
The Auto-1 program register is reset to FFFF/FFF/FF/F hex for the 16-, 12-, 8-, 4 channel devices respectively upon device powerup or reset; implying the device scans all channels in ascending order.
Auto-2 mode: In this mode the user can configure the program register to select the last channel in the scan sequence. The device scans all channels from channel 0 up to and including the last channel in ascending order. The multiplexer channel is selected every frame on the second falling edge of SCLK. There is a separate ‘program register’ for pre-programming of the last channel in the sequence (multiplexer depth). Table 6 lists the ‘Auto-2 prog’ register settings for selection of the last channel in the sequence.
Once programmed the device retains program register settings until the device is powered down, reset, or reprogrammed. It is allowed to exit and re-enter Auto-2 mode any number of times, without disturbing the ‘program register’ settings.
On powerup or reset the bits D9-D6 of the Auto-2 program register are reset to F/B/7/3 hex for the 16/12/8/4 channel devices respectively; implying the device scans all channels in ascending order.