TLC32046MFKB datasheet(25/56 Pages) TI

25 / 56 page

2–11

VCC +

RESET

VCC –

200 k

Ω

5 V

0.5

µF

– 5 V

TLC32046

Figure 2–3. Reset on Power-Up Circuit

2.17 Power-Up Sequence

To ensure proper operation of the AIC and as a safeguard against latch-up, it is recommended that Schottky

diodes with forward voltages less than or equal to 0.4 V be connected from VCC– to ANLG GND and from

VCC– to DGTL GND. In the absence of such diodes, power is applied in the following sequence: ANLG GND

and DGTL GND, VCC–, then VCC+ and VDD. Also, no input signal is applied until after power-up.

2.18 AIC Register Constraints

The following constraints are placed on the contents of the AIC registers:

TA register must be

≥ 4 in word mode (WORD/BYTE= high).

TA register must be

≥ 5 in byte mode (WORD/BYTE= low).

′ register can be either positive, negative, or zero.

RA register must be

≥ 4 in word mode (WORD/BYTE = high).

RA register must be

≥ 5 in byte mode (WORD/BYTE = low).

′ register can be either positive, negative, or zero.

(TA register

± TA′ register) must be > 1.

(RA register

± RA′ register) must be > 1.

TB register must be

≥ 15.

10. RB register must be

≥ 15.

2.19 AIC Responses to Improper Conditions

The AIC has provisions for responding to improper conditions. These improper conditions and the response

of the AIC to these conditions are presented in Table 2– 4.

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