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TLC1542I Datenblatt(PDF) 4 Page - Texas Instruments

Teilenummer TLC1542I
Bauteilbeschribung   10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
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FAST MODES
MODE 1: FAST MODE, CS INACTIVE (HIGH) BETWEEN CONVERSION CYCLES, 10-CLOCK TRANSFER
MODE 2: FAST MODE, CS ACTIVE (LOW) CONTINUOUSLY, 10-CLOCK TRANSFER
MODE 3: FAST MODE, CS INACTIVE (HIGH) BETWEEN CONVERSION CYCLES, 11- to 16-CLOCK
TLC1542I,, TLC1542M,, TLC1542Q
TLC1542C, TLC1543C, TLC1543I, TLC1543Q
SLAS052G – MARCH 1992 – REVISED JANUARY 2006
The MSB of the previous conversion appears at DATA OUT on the falling edge of CS in mode 1, mode 3, and
mode 5, on the rising edge of EOC in mode 2 and mode 4, and following the sixteenth clock falling edge in
mode 6. The remaining nine bits are shifted out on the next nine falling edges of I/O CLOCK. Ten bits of data
are transmitted to the host-serial interface through DATA OUT. The number of serial clock pulses used also
depends on the mode of operation, but a minimum of ten clock pulses is required for conversion to begin. On
the tenth clock falling edge, the EOC output goes low and returns to the high logic level when conversion is
complete and the result can be read by the host. Also, on the tenth clock falling edge, the internal logic takes
DATA OUT low to ensure that the remaining bit values are zero when the I/O CLOCK transfer is more than ten
clocks long.
Table 1 lists the operational modes with respect to the state of CS, the number of I/O serial transfer clocks that
can be used, and the timing edge on which the MSB of the previous conversion appears at the output.
Table 1. MODE OPERATION
TIMING
MODES
CS
NO. OF 1/O CLOCK
MSB AT DATA OUT(1)
DIAGRAM
Mode 1
High between conversion cycles
10
CS falling edge
Figure 9
Mode 2
Low continuously
10
EOC rising edge
Figure 10
Fast Modes
Mode 3
High between conversion cycles
11 TO 16(2)
CS falling edge
Figure 11
Mode 4
Low continuously
16(2)
EOC rising edge
Figure 12
Mode 5
High between conversion cycles
11 to 16(3)
CS falling edge
Figure 13
Slow Modes
Mode 6
Low continuously
16(3)
16th clock falling edge
Figure 14
(1)
These edges also initiate serial-interface communication.
(2)
No more than 16 clocks should be used.
(3)
No more than 16 clocks should be used.
The device is in a fast mode when the serial I/O CLOCK data transfer is completed before the conversion is
completed. With a 10-clock serial transfer, the device can only run in a fast mode since a conversion does not
begin until the falling edge of the tenth I/O CLOCK.
In this mode, CS is inactive (high) between serial I/O CLOCK transfers and each transfer is ten clocks long. The
falling edge of CS begins the sequence by removing DATA OUT from the high-impedance state. The rising edge
of CS ends the sequence by returning DATA OUT to the high-impedance state within the specified delay time.
Also, the rising edge of CS disables the I/O CLOCK and ADDRESS terminals within a setup time plus two falling
edges of the internal system clock.
In this mode, CS is active (low) between serial I/O CLOCK transfers and each transfer is ten clocks long. After
the initial conversion cycle, CS is held active (low) for subsequent conversions; the rising edge of EOC then
begins each sequence by removing DATA OUT from the low logic level, allowing the MSB of the previous
conversion to appear immediately on this output.
TRANSFER
In this mode, CS is inactive (high) between serial I/O CLOCK transfers, and each transfer can be 11 to 16 clocks
long. The falling edge of CS begins the sequence by removing DATA OUT from the high-impedance state. The
rising edge of CS ends the sequence by returning DATA OUT to the high-impedance state within the specified
delay time. Also, the rising edge of CS disables the I/O CLOCK and ADDRESS terminals within a setup time
plus two falling edges of the internal system clock.
4
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