Datasheet

Satust
Acquire
Selected
Channel
B syu
(2)
PWRCON
(3)
C nverto
Selected
Channel
In tpu Multiplexer
Sele ect dCh nn la e
(1)
t
PU
t
ACQ
t
CONV
t
ACQ
t
ACQ
t
CONV
t
CONV
C nverto
Selected
Channel
C nverto
Selected
Channel
Awake
Acquire
Selected
Channel
Acquire
Selected
Channel
(4)
ADS7924
www.ti.com SBAS482A –JANUARY 2010–REVISED MAY 2010
Auto-Single Mode
This mode can be used with the onboard digital
comparator to monitor the status of an input signal
This mode automatically converts the selected
with little support needed from a host microcontroller.
channel continuously, as shown in Figure 25. After
Note that the conversion time is less than the I
2
C
the ADC Mode Control register is written, the
data retrieval time. It is suggested to stop this mode
power-up time (t
PU
) is allowed to elapse. This value
by setting the mode to Idle or stopping the conversion
can be set to '0' to effectively bypass if not needed.
by configuring the alarm to do so, before retrieving
Before the conversion, an acquisition time (t
ACQ
) is
data. The alarm can also be configured to continue
allowed to elapse. t
ACQ
time is programmable through
the conversion even after an interrupt is generated.
the ACQCONFIG register, bits[4:0]. Sleep time
(t
SLEEP
) is not used in this mode. After the conversion
completes the cycle is repeated.
(1) Same channel is continuously converted.
(2) Busy is an internal signal shown as active high that can be routed to the INT pin for external monitoring.
(3) PWRCON is shown enabled and active high.
(4) The mode begins on the trailing edge of the I
2
C acknowledge after writing to the MODECNTL register.
Figure 25. Example of Auto-Single Operation
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