Device operation in Manual or
Auto
-
1 mode
Change to Auto
-
2 mode ?
* Sample: Samples and converts channel selected in ‘frame n-1’
* Mux
: Selects channel incremented from previous frame as per Auto-1 sequence, or channel
programmed in previous frame in case of manual mode.
. This channel will be acquired in this frame
and sampled at start of ‘frame n +1’
* Range: As programmed in ‘frame n-1’. Applies to channel selected for acquisition in current frame
.
* SDI
: Programming for ‘frame n+1’
DI15..12 = 0011 binary …. Selects Auto-2 mode
DI11=1 enables programming of ‘range and GPIO’
DI10 = x, Device automatically resets to channel 0.
DI6.. As per required range for channel to be selected
DI5=0 .. No power down
DI4..0… as per GPIO settings
*SDO : DO15..0 address(or GPIO data) & conversion data of channel selected in ‘frame n -1’
* GPIO :
O/P: latched on CS falling edge as per DI 3..0 written in frame n -1’
I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same
frame
No
Yes
CS
CS
Continue operation in Auto -2 mode
CS
Frame: n-1
Frame: n
Request
for Auto-2
mode
* Sample: Samples and converts channel selected in ‘frame n’
* Mux
: Selects channel0 (Auto-2 sequence always starts with Ch -0); this channel will be acquired
in this frame and sampled at start of ‘frame n+2’
* Range: As programmed in ‘frame n’. Applies to channel selected for acquisition in current frame
.
* SDI
: Programming for ‘frame n +2’
DI15..12 = 0011 binary …. To continue in Auto -2 mode
DI11=1 enables programming of ‘range and GPIO’
DI10 =0, not to reset channel sequence
DI6.. As per required range for channel to be selected
DI5=0 .. No power down
DI4..0… as per GPIO settings
*SDO : DO15..0 address(or GPIO data) & conversion data of channel selected in ‘frame n’
* GPIO :
O/P: latched on CS falling edge as per DI 3..0 written in frame ‘n’
I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same
frame
CS
Frame:
n+1
Entry into
Auto-2
Mode
* Sample: Samples and converts channel 0
* Mux
: Selects next higher channel in Auto -2 sequence, this channel will be acquired in this frame
and sampled at start of ‘frame n+3’
* Range: As programmed in ‘frame n+1’. Applies to channel selected for acquisition in current frame.*
SDI
: Programming for ‘frame n+3’
DI15..12 = 0011 binary …. To continue in Auto -2 mode
DI11=1 enables programming of ‘range and GPIO’
DI10 =0 not to reset channel sequence
DI6.. As per required range for channel to be selected
DI5=0 .. No power down
DI4..0… as per GPIO settings
*SDO : DO15..0 address(or GPIO data) & conversion data of channel selected in ‘frame n+1’
* GPIO :
O/P: latched on CS falling edge as per DI 3..0 written in frame n+1’
I/P: Input status latched on falling edge of CS and transferred serially on SDO in the same
frame
CS
Frame:
n+2
Operation
in Auto-2
mode
38
ADS7950, ADS7951, ADS7952, ADS7953, ADS7954, ADS7955
ADS7956, ADS7957, ADS7958, ADS7959, ADS7960, ADS7961
SLAS605C – JUNE 2008 – REVISED JULY 2018
Product Folder Links:
ADS7950 ADS7951 ADS7952 ADS7953 ADS7954 ADS7955 ADS7956 ADS7957 ADS7958
Copyright © 2008–2018, Texas Instruments Incorporated
8.4.6 Operating in Auto-2 Mode
illustrates the steps involved in entering and operating in Auto-2 channel sequencing mode.
lists the mode control register settings for Auto-2 mode.
Figure 55. Entering and Running in Auto-2 Channel Sequencing Mode
