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TLC2554 Datasheet(PDF) 7 Page - Texas Instruments |
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TLC2554 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 37 page TLC2554, TLC2558 5-V, 12-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN SLAS220A –JUNE 1999 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 control and timing (continued) configuration Configuration data is stored in one 12-bit configuration register (CFR) (see Table 2 for CFR bit definitions). Once configured after first power up, the information is retained in the H/W or S/W power-down state. When the device is being configured, a write CFR cycle is issued by the host processor. This is a 16-bit write. If the SCLK stops after the first 8 bits are entered, then the next eight bits can be taken after the SCLK is resumed. The status of the CFR can be read with a read CFR command. Table 2. TLC2554/TLC2558 Configuration Register (CFR) Bit Definitions BIT DEFINITION D(15–12) All zeros, nonprogrammable D11 Reference select 0: External 1: Internal D10 Output select 0: Unipolar straight binary 1: 2’s complement D9 Sample period select 0: Short sampling 12 SCLKs (1x sampling time) 1: Long sampling 24 SCLKs (2x sampling time) D8 Conversion clock source select 0: Conversion clock = SCLK 1: Conversion clock = SCLK/2 D7 Input select 0: Normal 1: Pseudo differential CH A2(2558) or CH A1 (2554) is the differential input D(6,5) Conversion mode select 00: Single shot mode 01: Repeat mode 10: Sweep mode 11: Repeat sweep mode D(4,3)† TLC2558 TLC2554 Sweep auto sequence select 00: 0–1–2–3–4–5–6–7 01: 0–2–4–6–0–2–4–6 10: 0–0–2–2–4–4–6–6 11: 0–2–0–2–0–2–0–2 Sweep auto sequence select 00: N/A 01: 0–1–2–3–0–1–2–3 10: 0–0–1–1–2–2–3–3 11: 0–1–0–1–0–1–0–1 D2 EOC/INT – pin function select 0: Pin used as INT 1: Pin used as EOC D(1,0) FIFO trigger level (sweep sequence length) 00: Full (INT generated after FIFO level 7 filled) 01: 3/4 (INT generated after FIFO level 5 filled) 10: 1/2 (INT generated after FIFO level 3 filled) 11: 1/4 (INT generated after FIFO level 1 filled) † These bits only take effect in conversion modes 10 and 11. sampling The sampling period starts after the first 4 input data are shifted in if they are decoded as one of the conversion commands. These are select analog input (channel 0 through 7) and select test (channel 1 through 3). |
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