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TLV2544CDG4 Datasheet(PDF) 6 Page - Texas Instruments |
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TLV2544CDG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 48 page TLV2544, TLV2548 2.7V TO 5.5V, 12BIT, 200KSPS, 4/8CHANNEL, LOW POWER SERIAL ANALOGTODIGITAL CONVERTERS WITH AUTOPOWERDOWN SLAS198E − FEBRUARY 1999 − REVISED JUNE 2003 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 control and timing power up and initialization requirements D Determine processor type by writing A000h to the TLV2544/48 (CS must be toggled) D Configure the device (CS must make a high-to-low transition, then can be held low if in DSP mode; i.e., active FS.) The first conversion after power up or resuming from power down is not valid. start of the cycle: D When FS is not used (FS = 1 at the falling edge of CS), the falling edge of CS is the start of the cycle. D When FS is used (FS is an active signal from a DSP), the falling edge of FS is the start of the cycle. first 4-MSBs: the command register (CMR) The TLV2544/TLV2548 have a 4-bit command set (see Table 1) plus a 12-bit configuration data field. Most of the commands require only the first 4 MSBs, i.e., without the 12-bit data field. The valid commands are listed in Table 1. Table 1. TLV2544/TLV2548 Command Set SDI D(15−12) BINARY TLV2548 COMMAND TLV2544 COMMAND 0000b 0h Select analog input channel 0 Select analog input channel 0 0001b 1h Select analog input channel 1 N/A 0010b 2h Select analog input channel 2 Select analog input channel 1 0011b 3h Select analog input channel 3 N/A 0100b 4h Select analog input channel 4 Select analog input channel 2 0101b 5h Select analog input channel 5 N/A 0110b 6h Select analog input channel 6 Select analog input channel 3 0111b 7h Select analog input channel 7 N/A 1000b 8h SW power down (analog + reference) 1001b 9h Read CFR register data shown as SDO D(11−0) 1010b Ah plus data Write CFR followed by 12-bit data, e.g., 0A100h means external reference, short sampling, SCLK/4, single shot, INT 1011b Bh Select test, voltage = (REFP+REFM)/2 1100b Ch Select test, voltage = REFM 1101b Dh Select test, voltage = REFP 1110b Eh FIFO read, FIFO contents shown as SDO D(15−4), D(3−0) = 0000 1111b Fh plus data Reserved 1111b Fh plus data Reserved NOTE: The status of the CFR can be read with a read CFR command when the device is programmed for one-shot conversion mode (CFR D[6,5] = 00). |
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