FT800Q-R datasheet(26/46 Pages) BRIDGETEK

26 / 46 page

FT800 Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000039 Clearance No.: BRT#001

4.8 Power Management

4.8.1

Power supply

The FT800 may be operated with a single supply of 3.3V apply to VCC and VCCIO pins. For operation with

host MPU/MCU at lower supply, connect the VCCIO to MPU power to match the interface power.

Symbol

Typical

Description

VCCIO

1.8V, or 2.5V, or 3.3V

Supply for Host interface digital I/O pad only, LCD RGB

interface supply from VCC.

VCC

3.3V

Supply for chip

Table 4-15 Power supply

4.8.2

Internal Regulator and POR

The 1.2V internal regulator provides power to the core circuit. The regulator is disabled when device is in

POWERDOWN state. Power down is activated either by the SCU command write or by holding down the

PD_N pin for at least 5mS to allow the 1.2V decoupling capacitor to discharge fully. The regulator is

enabled only by releasing the PD_N pin. A 47kΩ resistor is recommended to pull the PD_N pin up to

VCCIO, together with a 100nF capacitor to ground in order to delay the 1.2V regulator powering up after

the VCC and VCCIO are stable.

The 1.2V internal regulator requires a compensation capacitor to be stable. A typical design puts a 4.7uF

capacitor with ESR >0.5Ω is required between VCC1V2 to GND pins. Do not connect any load to this pin.

The 1.2V regulator will generate Power-On-Reset (POR) pulse when the output voltage rises above the

POR threshold. The POR will reset all the core digital circuits.

It is possible to use PD_N pin as an asynchronous hardware reset input. Drive PD_N low for at least 5ms

and then drive it high will reset the FT800 chip.

Figure 4-8 1.2V regulator

VCC

PD_N

VCC1V2

VCC

GND

VCCIO

Cin

10uF

100nF

1.2V

GND

Ccomp

4.7uF

47k

FT800

FT800Q-R 数据表(PDF) 26 Page - Bridgetek Pte Ltd.

FT800Q-R 数据表(HTML) 26 Page - Bridgetek Pte 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

数据表下载