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ConvA ConvB ConvC

CONVST

BUSY

Mode0(One-shotconversionstart,oneBUSYforwholesequence)

CONVST

BUSY

Mode1(One-shotconversionstart,oneBUSYforeachconversion)

CONVST

BUSY

Mode2(OneconversionstartandoneBUSYforeachconversion)

5.5t

CLK

CLOCK

CONVST

DB[11:0]

BUSY

Conversionof

BothCH1+

Conversionof

BothCH1-

Output

CHA1+

1 21

0x104

0xF90

Output

CHB1+

4114

Output

CHA1-

Output

CHB1-

Conv.of

BothCH0+

ADS7865

SBAS441C –OCTOBER 2008–REVISED APRIL 2012

www.ti.com

Table 12. Channel Selection Table 13. SP1 and SP0: Sequence Position (Read-

Only)

ADC A/B

SP1 SP0 FUNCTION

COMMON-MODE

CHx CMx SIGNAL INPUT INPUT

0 0 Sequencer disabled

0 0 CHA0+/CHB0+ CHA0–/CHB0–

CH1/CM1 (bits 6/7) to be converted at

0 1

next falling edge of CONVST

0 1 CHA1–/CHB1– CHA0–/CHB0–

CH2/CM2 (bits 4/5) to be converted at

1 0 CHA1+/CHB1+ CHA0–/CHB0–

1 0

next falling edge of CONVST

1 1 CHA1+/CHB1+ CHA1–/CHB1–

CH3/CM3 (bits 2/3) to be converted at

1 1

next falling edge of CONVST

Figure 33. Sequencer Modes (Example: SL = '11')

Figure 34. Sequencer Programming Example

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 32 33

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