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LM12454 Datasheet(PDF) 36 Page - Texas Instruments

Part # LM12454
Description  LM12454/LM12458/LM12H458 12-Bit Sign Data Acquisition System with Self-Calibration
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM12454 Datasheet(HTML) 36 Page - Texas Instruments

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LM12454, LM12458, LM12H458
SNAS079A – MAY 2004 – REVISED FEBRUARY 2006
www.ti.com
The Sequencer's Instruction Pointer value is readable at any time and is found in the Status register at Bits 8–10.
The Sequencer can go through eight states during instruction execution:
State 0: The current instruction's first 16 bits are read from the Instruction RAM “00”. This state is one clock
cycle long.
State 1: Checks the state of the Calibration and Start bits. This is the “rest” state whenever the Sequencer is
stopped using the reset, a Pause command, or the Start bit is reset low (“0”). When the Start bit is set to a “1”,
this state is one clock cycle long.
State 2: Perform calibration. If bit 2 or bit 6 of the Configuration register is set to a “1”, state 2 is 76 clock
cycles long. If the Configuration register's bit 3 is set to a “1”, state 2 is 4944 clock cycles long.
State 3: Run the internal 16-bit Timer. The number of clock cycles for this state varies according to the value
stored in the Timer register. The number of clock cycles is found by using the expression below
32T + 2
(3)
where 0
≤ T ≤ 216 −1.
State 7: Run the acquisition delay and read Limit #1's value if needed. The number of clock cycles for 12-bit +
sign mode varies according to
9 + 2D
(4)
where D is the user-programmable 4-bit value stored in bits 12–15 of Instruction RAM “00” and is limited to 0
≤ D
≤ 15.
The number of clock cycles for 8-bit + sign or “watchdog” mode varies according to
2 + 2D
(5)
where D is the user-programmable 4-bit value stored in bits 12–15 of Instruction RAM “00” and is limited to 0
≤ D
≤ 15.
State 6: Perform first comparison. This state is 5 clock cycles long.
State 4: Read Limit #2. This state is 1 clock cycle long.
State 5: Perform a conversion or second comparison. This state takes 44 clock cycles when using the 12-bit +
sign mode or 21 clock cycles when using the 8-bit + sign mode. The “watchdog” mode takes 5 clock cycles.
36
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Copyright © 2004–2006, Texas Instruments Incorporated
Product Folder Links: LM12454 LM12458 LM12H458


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