TLC320AC02 datasheet(17/84 Pages) TI

17 / 84 page

2–2

Stand-Alone Mode

The operating mode under which the device generates and uses its own shift clock

and frame-sync signal. The device has no slave devices.

The X represents a don’t-care bit position within the control register format.

2.2

Reset and Power-Down Functions

2.2.1

Reset

The TLC320AC02 resets both the internal counters and registers, including the programmed registers, by

any of the following:

•

Applying power to the device, causing a power-on reset (POR)

•

Applying a low reset pulse to RESET

•

Reading in the programmable software reset bit (DS01 in register 6)

PWR DWN resets the counters only and preserves the programmed register contents.

2.2.2

Conditions of Reset

The two internal reset signals used for the reset and synchronization functions are as follows:

Counter reset: This signal resets all flip-flops and latches that are not externally programmed with

the exception of those generating the reset pulse itself. In addition, this signal resets the software

power-down bit.

Counter reset = power-on reset + RESET + RESET bit + PWR DWN

except those generating the reset pulse itself.

Both reset signals are at least one master-clock period long and release on the falling edge of the master

clock.

2.2.3

Software and Hardware Power-Down

Given the definitions and conditions of RESET, the software-programmed power-down condition is cleared

by resetting the software bit (DS00 in register 6) to zero. It is also cleared by either cycling the power to the

device, bringing PWR DWN low, or bringing RESET low.

PWR DWN powers down the entire chip ( < 1 mA ). The software-programmable power-down bit only

powers down the analog section of the chip ( < 3 mA ), which allows a software power-up function. Cycling

PWR DWN high to low and back to high resets all flip-flops and latches that are not externally programmed,

thereby preserving the register contents.

When PWR DWN is not used, it should be tied high.

2.2.4

The default value of the A-register data is decimal 18 as shown below.

DS07

DS06

DS05

DS04

DS03

DS02

DS01

DS00

TLC320AC02 Datasheet(PDF) 17 Page - Texas Instruments

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