Datasheet

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DI3..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DI3..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DI3..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
ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
www.ti.com SLAS605A –JUNE 2008–REVISED JANUARY 2010
OPERATING IN AUTO-2 MODE
The details regarding entering and running in Auto-2 channel sequencing mode are illustrated in Figure 53.
Table 5 lists the Mode Control Register settings for Auto-2 mode in detail.
Figure 53. Entering and Running in Auto-2 Channel Sequencing Mode
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Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
ADS7959, ADS7960, ADS7961