Datasheet

Status
Awake
Awaiting
Mode
Selection
Busy
(1)
DataReady
(1)
P R NW CO
(2)
Convert
Selected
Channel
I putn M lt p xeu e ri l
Sele ect dCh nn la e
t
PU
t
ACQ
t
CONV
Acquire
Selected
Channel
(3)
ADS7924
www.ti.com SBAS482A –JANUARY 2010–REVISED MAY 2010
Manual-Single Mode
After the conversion completes, the device waits for a
new mode to be set. This mode can be set to Idle to
This mode converts the selected channel once, as
save power. When t
PU
and t
ACQ
are very short, the
shown in Figure 23. After the ADC Mode Control
very short conversion time needed allows a read
register is written, the power-up time (t
PU
) and
register operation to be issued on the I
2
C bus
acquisition time (t
ACQ
) are allowed to elapse. t
PU
can
immediately after the write operation that initiates this
be set to '0' to effectively bypass if not needed. t
ACQ
mode. It is important to note that t
PU
only applies to
time is programmable through the ACQCONFIG
the first manual-single command.
register, bits[4:0]. Sleep time (t
SLEEP
) is not used in
this mode.
If multiple conversions are needed, the manual-single
mode can be reissued without requiring the awake
mode to be issued in between. Consecutive
manual-single commands have no t
PU
period.
(1) Busy and data ready are internal signals shown as active high that can be routed to the INT pin for external monitoring.
(2) PWRCON is shown enabled and active high.
(3) The mode begins on the trailing edge of the I
2
C acknowledge after writing to the MODECNTL register.
Figure 23. Manual-Single Operation Example
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