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LM12L458CIV Datasheet(PDF) 19 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM12L458CIV
Description  12-Bit Sign Data Acquisition System with Self-Calibration
Download  36 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM12L458CIV Datasheet(HTML) 19 Page - National Semiconductor (TI)

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2.0 Internal User-Programmable
Registers (Continued)
limit #2, its sign, and an indicator that shows that an interrupt
can be generated if the input signal is greater or less than the
programmed limit.
Instruction RAM “00”
Bit 0 is the LOOP bit. It indicates the last instruction to be ex-
ecuted in any instruction sequence when it is set to a “1”.
The next instruction to be executed will be instruction 0.
Bit 1 is the PAUSE bit. This controls the Sequencer’s opera-
tion. When the PAUSE bit is set (“1”), the Sequencer will stop
after reading the current instruction, but before executing it
and the start bit, in the Configuration register, is automati-
cally reset to a “0”. Setting the PAUSE also causes an inter-
rupt to be issued. The Sequencer is restarted by placing a
“1” in the Configuration register’s Bit 0 (Start bit).
After the Instruction RAM has been programmed and the
RESET bit is set to “1”, the Sequencer retrieves Instruction
000, decodes it, and waits for a “1” to be placed in the Con-
figuration’s START bit. The START bit value of “0” “over-
rides” the action of Instruction 000’s PAUSE bit when the Se-
quencer is started. Once started, the Sequencer executes
Instruction 000 and retrieves, decodes, and executes each
of the remaining instructions. No PAUSE Interrupt (INT 5) is
generated the first time the Sequencer executes Instruction
000 having a PAUSE bit set to “1”. When the Sequencer en-
counters a LOOP bit or completes all eight instructions, In-
struction 000 is retrieved and decoded. A set PAUSE bit in
Instruction 000 now halts the Sequencer before the instruc-
tion is executed.
Bits 2–4 select which of the eight input channels (“000” to
“111” for IN0–IN7) will be configured as non-inverting inputs
to the LM12L458’s ADC. (See Page 23,
Table 1.)
Bits 5–7 select which of the seven input channels (“001” to
“111” for IN1 to IN7) will be configured as inverting inputs to
the LM12L458’s ADC. (See
Table 1.) Fully differential opera-
tion is created by selecting two multiplexer channels, one op-
erating in the non-inverting mode and the other operating in
the inverting mode. A code of “000” selects ground as the in-
verting input for single ended operation.
Bit 8 is the SYNC bit. Setting Bit 8 to “1” causes the Se-
quencer to suspend operation at the end of the internal S/H’s
acquisition cycle and to wait until a rising edge appears at
the SYNC pin. When a rising edge appears, the S/H ac-
quires the input signal magnitude and the ADC performs a
conversion on the clock’s next rising edge. When the SYNC
pin is used as an input, the Configuration register’s “I/O Se-
lect” bit (Bit 7) must be set to a “0”. With SYNC configured as
an input, it is possible to synchronize the start of a conver-
sion to an external event. This is useful in applications such
as digital signal processing (DSP) where the exact timing of
conversions is important.
When the LM12L458 is used in the “watchdog” mode with
external synchronization, two rising edges on the SYNC in-
put are required to initiate two comparisons. The first rising
edge initiates the comparison of the selected analog input
signal with Limit #1 (found in Instruction RAM “01”) and the
second rising edge initiates the comparison of the same ana-
log input signal with Limit #2 (found in Instruction RAM “10”).
Bit 9 is the TIMER bit. When Bit 9 is set to “1”, the Se-
quencer will halt until the internal 16-bit Timer counts down
to zero. During this time interval, no “watchdog” comparisons
or analog-to-digital conversions will be performed.
Bit 10 selects the ADC conversion resolution. Setting Bit 10
to “1” selects 8-bit + sign and when reset to “0” selects 12-bit
+ sign.
Bit 11 is the “watchdog” comparison mode enable bit. When
operating in the “watchdog” comparison mode, the selected
analog input signal is compared with the programmable val-
ues stored in Limit #1 and Limit #2 (see Instruction RAM “01”
and Instruction RAM “10”). Setting Bit 11 to “1” causes two
comparisons of the selected analog input signal with the two
stored limits. When Bit 11 is reset to “0”, an 8-bit + sign or
12-bit + sign (depending on the state of Bit 10 of Instruction
RAM “00”) conversion of the input signal can take place.
www.national.com
19


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