AD8385ASVZ datasheet(19/24 Pages) AD

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AD8385

Rev. 0 | Page 19 of 24

APPLICATIONS

IMAGE

PROCESSOR

1/3 AD8389

CLK

DXI, CLXI,

ENBX(1–4)I

DXxO, CLXxO,

ENBX(1–4)xO

MONITxI

µP

AD8385

VID(0:11)

DB(0:9)

STSQ, XFR,

CLK, R/L, INV

DIRX, DIRY,

DY, CLY,

CLYN, NRG

DIRXIN, DIRYIN,

DYIN, CLYIN,

NRGIN

MONITI

MONITO

DX,

CLX, CLXN,

ENBX (1–4)

DXIN,

CLXIN,

ENBXIN (1–4)

SDI

SCL

SEN

VAO1

VAO2

VRH, VRL,

V1, V2,

SVRH, SVRL

DC REFERENCE

VOLTAGES

MONITOR

VCOM

LCD TIMING

CONTROLS

LCD TIMING

CONTROLS

12-CHANNEL LCD

CHANNEL 0–5

Figure 16. Typical Applications Circuit

OPTIMIZED RELIABILITY WITH THE THERMAL SWITCH

While internal current limiters provide short-term protection

against temporary shorts at the outputs, the thermal switch

must be enabled to protect against persistent shorts lasting for

several seconds.

Initial Power-Up After Assembly or Repair Using a

Service Jumper

To optimize reliability with the use of the thermal switch, the

following sequence of operations is recommended:

Ensure that the TSTM pin is high on initial power-up by

inserting a service jumper. See Figure 17.

Execute the initial power-up.

Identify any shorts at outputs.

Power down, repair shorts, and repeat the initial power-up

sequence until proper system functionality is verified.

Remove service jumper.

Resume normal operation.

DVCC

DGND

OPTION A

OPTION B

SERVICE

JUMPER

SERVICE

JUMPER

AD8385

TSTM PIN7

AD8385

TSTM PIN7

µP

Figure 17. Service Jumper Location

Initial Power-Up after Assembly or Repair Using the

Serial Interface

Immediately after power-up, send Code 011XXXXXXXXX

through the serial interface to enable the thermal switch

and disable the grounded output mode.

Identify any shorts at the outputs.

Power down, repair shorts, and repeat the initial power-up

sequence until proper system functionality is verified.

Resume normal operation.

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