FT800 datasheet(32/55 Pages) FTDI

32 / 55 page

Document No.: FT_000792

FT800

Embedded Video Engine

Datasheet Version 1.1

Clearance No.: FTDI# 334

4.8.3 Power Modes

When supply to VCCIO and VCC is applied, internal 1.2V regulator is powered by VCC. An

internal POR pulse will be generated during the regulator power up until it is stable. After the

initial power up, the FT800 will stay in STANDBY state. When needed, host can set FT800 to

ACTIVE state by performing a dummy read to address 0. The graphics engine, the audio

engine and the touch engine are only functional in ACTIVE state. To save power host can send

command to put FT800 into any of the low power mode: STANDBY, SLEEP and POWERDOWN.

In addition, host is allowed to put FT800 in POWERDOWN mode by drive PD_N pin to low,

regardless what current state it is in. Refer to Error! Reference source not found.Figure 4-8

for the power state transitions.

Figure 4-8 Power State Transition

POWERDOWN

STANDBY

SLEEP

VCC/VCCIO

Power ON

Toggle PD_N from high

to low

ACTIVE

Toggle PD_N from low

to high

Toggle PD_N from high

to low

Toggle PD_N from high to low or

Write command “POWERDOWN”

Write command “SLEEP”

Write command

“STANDBY”

Dummy Read “0”

FT800 Datasheet(PDF) 32 Page - Future Technology Devices International Ltd.