FT801 Datasheet, PDF (33/57 Pages) Future Technology Devices International Ltd. – The FT801 is an easy to use graphic controller targeted for embedded applications to generate high-quality Human Machine Interfaces (HMIs). It has the following features

4.8.3 Power Modes
Document No.: FT_000986
FT801 Embedded Video Engine
Datasheet Version 1.0
Clearance No.: FTDI#376
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 FT801 will stay in STANDBY state. When needed, host can set FT801 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 FT801 into any of the low power mode: STANDBY, SLEEP and POWERDOWN.
In addition, host is allowed to put FT801 in POWERDOWN mode by drive PD_N pin to low,
regardless what current state it is in. Refer to Figure 4-9 for the power state transitions.
Toggle PD_N from high
to low
VCC/VCCIO
Power ON
Toggle PD_N from low
to high
POWERDOWN
STANDBY
Dummy Read “0”
Toggle PD_N from high
to low
Write command “POWERDOWN”
Toggle PD_N from high to low or
Write command
“STANDBY”
SLEEP
Dummy Read “0”
ACTIVE
Write command “SLEEP”
Figure 4-9 Power State Transition
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