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ADC0819BCV Fiches technique(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce ADC0819BCV
Description  8-Bit Serial I/O A/D Converter with 19-Channel Multiplexer
Download  12 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0819BCV Fiches technique(HTML) 8 Page - National Semiconductor (TI)

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Functional Description
10 DIGITAL INTERFACE
The ADC0819 uses five inputoutput pins to implement the
serial interface Taking chip select (CS) low enables the IO
data lines (DO and DI) and the serial clock input (SCLK) The
result of the last conversion is transmitted by the AD on the
DO line while simultaneously the DI line receives the ad-
dress data that selects the mux channel for the next conver-
sion The mux address is shifted in on the rising edge of
SCLK and the conversion data is shifted out on the falling
edge It takes eight SCLK cycles to complete the serial IO
A second clock (w2) controls the SAR during the conversion
process and must be continuously enabled
11 CONTINUOUS SCLK
With a continuous SCLK input CS must be used to synchro-
nize the serial data exchange (see
Figure 1 ) The ADC0819
recognizes a valid CS one to three w2 clock periods after
the actual falling edge of CS This is implemented to ensure
noise immunity of the CS signal Any spikes on CS less than
one w2 clock period will be ignored CS must remain low
during the complete IO exchange which takes eight SCLK
cycles Although CS is not immediately acknowledged for
the purpose of starting a new conversion the falling edge of
CS immediately enables DO to output the MSB (D7) of the
previous conversion
The first SCLK rising edge will be acknowledged after a set-
up time (tset-up) has elapsed from the falling edge of CS
This and the following seven SCLK rising edges will shift in
the channel address for the analog multiplexer Since there are
19 channels only five address bits are utilized The first five
SCLK cycles clock in the mux address during the next three
SCLK cycles the analog input is selected and sampled During
this mux addresssample cycle data from the last conver-
sion is also clocked out on DO Since D7 was clocked out
on the falling edge of CS only data bits D6 – D0 remain to be
received The following seven falling edges of SCLK shift out
this data on DO
The 8th SCLK falling edge initiates the beginning of the AD’s
actual conversion process which takes between 26 and 32
w2 cycles (TC) During this time CS can go high to TRI-
STATE DO and disable the SCLK input or it can remain low
If CS is held low a new IO exchange will not start until the
conversion sequence has been completed however once
the conversion ends serial IO will immediately begin Since
there is an ambiguity in the conversion time (TC) synchroniz-
ing the data exchange is impossible Therefore CS should
go high before the 26th w2 clock has elasped and return low
after the 32nd w2 to synchronize serial communication
A conversion or IO operation can be aborted at any time by
strobing CS IfCS is high or low less than one w2 clock it will
be ignored by the AD If the CS is strobed high or low
between 1 to 3 w2 clocks the AD may or may not respond
Therefore CS must be strobed high or low greater than 3 w2
clocks to ensure recognition If a conversion or IO ex-
change is aborted while in process the consequent data
output will be erroneous until a complete conversion se-
quence has been implemented
12 DISCONTINUOUS SCLK
Another way to accomplish synchronous serial communica-
tion is to tie CS low continuously and disable SCLK after its
8th falling edge (see
Figure 2 ) SCLK must remain low for
TLH9287 – 16
FIGURE 1
TLH9287 – 17
FIGURE 2
8


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