ST7715 datasheet(63/167 Pages) SITRONIX

63 / 167 page

ST7715

V1.5

2009-12-04

9.12 Power ON/OFF Sequence

VDDI and VDD can be applied in any order.

VDDI and VDD can be powered down in any order.

During power off, if LCD is in the Sleep Out mode, VDD and VDDI must be powered down minimum 120msec after RESX

has been released.

During power off, if LCD is in the Sleep In mode, VDDI or VDD can be powered down minimum 0msec after RESX has

been released.

CSX can be applied at any timing or can be permanently grounded. RESX has priority over CSX.

Note 1: There will be no damage to the display module if the power sequences are not met.

Note 2: There will be no abnormal visible effects on the display panel during the Power On/Off Sequences.

Note 3: There will be no abnormal visible effects on the display between end of Power On Sequence and before receiving Sleep Out

command. Also between receiving Sleep In command and Power Off Sequence.

Note 4: If RESX line is not held stable by host during Power On Sequence as defined in the sequence below, then it will be necessary to

apply a Hardware Reset (RESX) after Host Power On Sequence is complete to ensure correct operation. Otherwise function is not

guaranteed.

The power on/off sequence is illustrated below

Timing when the latter signal rises up to 90% of its typical value.

e.g. When VDD comes later, this timing is defined at the cross point of

90% of 2.75V, not 90% of 2.6V.

Timing when the latter signal falls up to 90% of its typical value.

e.g. When VDD comes later, this timing is defined at the cross point of

90% of 2.75V, not 90% of 2.6V.

H or L

TrPW-CSX = +/- no limit

TfPW-CSX = +/- no limit

30%

TrPW-RESX = + no limit

TfPW-RESX1 = min 120ms

TfPW-RESX2 = min 0ms

TfPW-RESx1 is applied to RESX falling in the Sleep Out Mode.

TfPW-RESx2 is applied to RESX falling in the Sleep In Mode.

VDD

VDDI

CSX

RESX

(Power down in

sleep-out mode)

RESX

(Power down in

sleep-in mode)

TrPW ≧ 0ns

TfPW ≧ 0ns

ST7715 Datasheet(PDF) 63 Page - Sitronix Technology Co., Ltd.

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