Datasheet

Device operation in Manual or
Auto-2 mode
Change to Auto -1 mode?
* Sample: Samplesandconvertschannelselectedin ‘framen -1’
* Mux : Selectschannelincrementedfrompreviousframeasper Auto -2 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 = 0010 binary …. Selects Auto-1 mode
DI11=1 enablesprogrammingof ‘rangeandGPIO’
DI10 = x, Deviceautomaticallyresetschanneltolowestnumberin Auto-1 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
No
Yes
CS
CS
Continue operation in Auto -1 mode
CS
Frame: n-1
Frame: n
Request
for Auto-1
mode
* Sample: Samplesandconvertschannelselectedin ‘framen’
* Mux : Selectslowestchannel# in Auto-1 sequence; 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 = 0010 binary …. Tocontinuein Auto-1 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-1
Mode
* Sample: Samplesandconvertschannelselectedin ‘framen+1’ (ie. Lowestchannel# in Auto-1
sequence)
* Mux : Selectsnexthigherchannelin Auto -1 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 = 0010 binary …. Tocontinuein Auto-1 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-1
mode
ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
SLAS605A –JUNE 2008–REVISED JANUARY 2010 www.ti.com
OPERATING IN AUTO-1 MODE
The details regarding entering and running in Auto-1 channel sequencing mode are illustrated in the flowchart in
Figure 51. Table 2 lists the Mode Control Register settings for Auto-1 mode in detail.
Figure 51. Entering and Running in Auto-1 Channel Sequencing Mode
30 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
ADS7959, ADS7960, ADS7961