ADS7924_14 Datasheet, PDF (15/45 Pages) Texas Instruments – 2.2V, 12-Bit, 4-Channel, microPOWER™ ANALOG-TO-DIGITAL CONVERTER WITH I2C INTERFACE

ADS7924
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Auto-Single Mode
This mode automatically converts the selected
channel continuously, as shown in Figure 25. After
the ADC Mode Control register is written, the
power-up time (t_PU) is allowed to elapse. This value
can be set to '0' to effectively bypass if not needed.
Before the conversion, an acquisition time (t_ACQ) is
allowed to elapse. t_ACQ time is programmable through
the ACQCONFIG register, bits[4:0]. Sleep time
(t_SLEEP) is not used in this mode. After the conversion
completes the cycle is repeated.
SBAS482A – JANUARY 2010 – REVISED MAY 2010
This mode can be used with the onboard digital
comparator to monitor the status of an input signal
with little support needed from a host microcontroller.
Note that the conversion time is less than the I²C
data retrieval time. It is suggested to stop this mode
by setting the mode to Idle or stopping the conversion
by configuring the alarm to do so, before retrieving
data. The alarm can also be configured to continue
the conversion even after an interrupt is generated.
Status
Input Multiplexer
Awake
t_PU
Acquire
Selected
Channel
t_ACQ
Convert
Selected
Channel
t_CONV
Acquire
Selected
Channel
t_ACQ
Convert
Selected
Channel
t_CONV
Acquire
Selected
Channel
t_ACQ
Convert
Selected
Channel
t_CONV
Selected Channel⁽¹⁾
Busy⁽²⁾
PWRCON⁽³⁾
(4)
(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 I²C acknowledge after writing to the MODECNTL register.
Figure 25. Example of Auto-Single Operation
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