FT810Q datasheet(37/60 Pages) FTDI

37 / 60 page

Document No.: FT_001165

FT81X

Embedded Video Engine

Datasheet Version 1.2

Clearance No.:

FTDI#440

4.8.3 Power Modes

When the supply to VCCIO and VCC is applied, the internal 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

FT81x will stay in the SLEEP state. When needed, the host can set the FT81x to the ACTIVE state by

performing a SPI ACTIVE command. The graphics engine, the audio engine and the touch engine are only

functional in the ACTIVE state. To save power the host can send a command to put the FT81x into any of

the low power modes: STANDBY, SLEEP and POWERDOWN. In addition, the host is allowed to put the

FT81x in POWERDOWN mode by driving the PD_N pin to low, regardless of what state it is currently in.

Refer to

Figure 4-11 for the power state transitions.

Figure 4-11 Power State Transition

4.8.3.1 ACTIVE state

In ACTIVE state, the FT81x is in normal operation. The clock oscillator and PLL are functioning. The

system clock applied to the FT81x core engines is enabled.

4.8.3.2 STANDBY state

In STANDBY state, the clock oscillator and PLL remain functioning; the system clock applied to the FT81x

core engines is disabled. All register contents are retained.

4.8.3.3 SLEEP state

In SLEEP state, the clock oscillator, PLL and system clock applied to the FT81x core engines are disabled.

All register contents are retained.

4.8.3.4 POWERDOWN state

In POWERDOWN state, the clock oscillator, the PLL and the system clock applied to the FT81x core is

disabled. The core engines are powered down while the SPI interface for host commands remains

functional. All register contents are lost and reset to default when the chip is next switched on. The

internal regulator remains on.

POWERDOWN

SLEEP

STANDBY

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 “STANDBY”

Write command

“SLEEP”

Write command

“ACTIVE”

Write command

“ACTIVE”

FT810Q Datasheet(PDF) 37 Page - Future Technology Devices International Ltd.

FT810Q Datasheet(HTML) 37 Page - Future Technology Devices International Ltd.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Datasheet Download

Link URL