Datasheet
AD7946
Rev. A | Page 18 of 24
CS MODE 3-WIRE WITH BUSY INDICATOR
This mode is usually used when a single AD7946 is connected
to an SPI-compatible digital host having an interrupt input.
The connection diagram is shown in
Figure 35, and the
corresponding timing is given in
Figure 36.
With SDI tied to VIO, a rising edge on CNV initiates a
conversion, selects the
CS
mode, and forces SDO to high
impedance. SDO is maintained in high impedance until the
completion of the conversion irrespective of the state of CNV.
Prior to the minimum conversion time, CNV could be used to
select other SPI devices, such as analog multiplexers, but CNV
must be returned low before the minimum conversion time and
held low until the maximum conversion time to guarantee the
generation of the BUSY signal indicator. When the conversion
is complete, SDO goes from high impedance to low. With a
pull-up on the SDO line, this transition can be used as an
interrupt signal to initiate the data reading controlled by the
digital host. The AD7946 then enters the acquisition phase and
powers down. The data bits are then clocked out, MSB first, by
subsequent SCK falling edges. The data is valid on both SCK
edges. Although the rising edge can be used to capture the data,
a digital host using the SCK falling edge allows a faster reading
rate, provided it has an acceptable hold time. After the optional
15
th
SCK falling edge, or when CNV goes high, whichever is
earlier, SDO returns to high impedance.
If multiple AD7946s are selected at the same time, the SDO
output pin handles this contention without damage or induced
latch-up. Meanwhile, it is recommended to keep this contention
as short as possible to limit extra power dissipation.
DATA IN
IRQ
CLK
CONVERT
VIO
DIGITAL HOST
04656-034
47kΩ
CNV
SCK
SDOSDI
V
IO
AD7946
Figure 35.
CS
Mode 3-Wire with BUSY Indicator
Connection Diagram (SDI High)
SDO
D13 D12 D1 D0
t
DIS
SCK
123 131415
t
SCK
t
SCKL
t
SCKH
t
HSDO
t
DSDO
CNV
CONVERSIONACQUISITION
t
CONV
t
CYC
t
CNVH
t
ACQ
ACQUISITION
SDI = 1
04656-035
Figure 36.
CS
Mode 3-Wire with BUSY Indicator Serial Interface Timing (SDI High)