TLC1514, TLC1518

5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,

SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN

SLAS252 – DECEMBER 1999

6

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

control and timing

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. Input

data is shifted in on the rising edge, and output data changes on the falling edge of SCLK. This is typically

used for an SPI microcontroller, although it can also be used for a DSP.

D When FS is used ( FS is an active signal from a DSP), the falling edge of FS is the start of the cycle. Input

data is shifted in on the falling edge, and output data changes on the rising edge of SCLK. This is typically

used for a TMS320 DSP.

first 4-MSBs: the command register (CMR)

The TLC1514/TLC1518 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.

NOTE:

The device requires a write CFR (configuration register) with 000h data (write A000h to the serial

input) at power up to initialize host select mode.

The valid commands are listed in Table 1.

Table 1. TLC1514/TLC1518 Command Set

SDI D(15–12) BINARY, HEX

TLC1518 COMMAND

TLC1514 COMMAND

0000b

0000h

Select analog input channel 0

Select analog input channel 0

0001b

1000h

Select analog input channel 1

N/A

0010b

2000h

Select analog input channel 2

Select analog input channel 1

0011b

3000h

Select analog input channel 3

N/A

0100b

4000h

Select analog input channel 4

Select analog input channel 2

0101b

5000h

Select analog input channel 5

N/A

0110b

6000h

Select analog input channel 6

Select analog input channel 3

0111b

7000h

Select analog input channel 7

N/A

1000b

8000h

SW power down (analog + reference)

1001b

9000h

Read CFR register data shown as SDO D(11–0)

1010b

A000h plus data

Write CFR followed by 12-bit data

1011b

B000h

Select test, voltage = (REFP+REFM)/2

1100b

C000h

Select test, voltage = REFM

1101b

D000h

Select test, voltage = REFP

1110b

E000h

FIFO read, FIFO contents shown as SDO D(15–6), D(5–0) = XXXXXX

1111b

F000h plus data

Reserved

1111b

F000h plus data

Reserved