BT817AQ-R datasheet(36/58 Pages) BRIDGETEK

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BT817A Automotive Advanced Video Engine Datasheet

Version 1.0

Document No.: BRT_000251 Clearance No.: BRT#194

connect the VCCIO1 to the MPU IO supply to match the interface voltage. For operation with

LCD/touch panels at lower voltages, connect the VCCIO2 to the LCD/touch IO supply.

Symbol

Typical

Description

VCCIO1

1.8V, or 2.5V, or

3.3V

Supply for Host interface digital I/O pins

VCCIO2

1.8V, or 2.5V, or

3.3V

Supply for RGB and touch interface I/O pins

VCCIO3

1.8V, or 2.5V, or

3.3V

Supply for NOR Flash interface I/O pins

VCCA

3.3V

Supply for AUDIO_L pin

VCC

3.3V

Supply for 3.3V circuits

VCC1V2

1.28V

Supply for digital core.

Table 4-21 Power Supply

4.9.2 Power-On-Reset(POR)

The internal circuit will generate a Power-On-Reset (POR) pulse when the supply voltage rises above

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

4.9.3 Power Modes

After the initial power up, the BT817A will stay in the SLEEP state. When needed, the host can set

the BT817A 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 BT817A into any of the low power modes: STANDBY, SLEEP and

POWERDOWN. In addition, the host is allowed to put the BT817A in POWERDOWN mode from

ACTIVE mode by driving the PD_N pin to low. Refer to Figure 4-9 for the power state transitions.

Figure 4-9 Power State Transition

POWERDOWN

SLEEP

STANDBY

Power ON

Command

“PWRDOWN”

ACTIVE

Command

“PWRDOWN”

Command “STANDBY”

Command

“SLEEP”

Command

“ACTIVE”

Command

“ACTIVE”

Command

“PWRDOWN”

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