VS1000D-L 参数 Datasheet PDF下载

VS1000

6 VS1000 Functional Blocks

LEFT

RIGHT

CBUF

RCAP

VHIGH

6

VS1000 FUNCTIONAL BLOCKS

PWRBTN

Reference

Stereo

Earphone

Driver

Common

Voltage

Driver

IOVDD

Regulator

AVDD1

AVDD2

AVDD3

AVDD

Regulator

Stereo

DAC

Voltage

Monitor

CVDD

Regulator

USBP

USPN

USB

reset

<1.6V

XCS/GPIO1[0]

SCLK/GPIO1[1]

SI/GPIO1[2]

SO/GPIO1[3]

Serial

Data/

Control

Interface

VSDSP4

processor

UART

X RAM

X ROM

RX/GPIO1[5]

TX/GPIO1[4]

XTALO

XTALI

Data/

GPIO0[0...7]

Control/

GPIO0[8...14]

Y RAM

Clock

Y ROM

NAND

Flash

Interface/

General IO

I RAM

I ROM

TEST

XRESET

IOVDD1

IOVDD2

Figure 2: VS1000 Block Diagram

6.1

Regulator Section

The VHIGH pin in the regulator section is used as a common main power supply for voltage

regulation. This input is connected to three internal regulators, which are activated when the

PWRBTN pin is set high for about one millisecond, so that AVDD starts to rise and reaches

about 1.5 V. After the PWRBTN has given this initial start current, the regulators reach their de-

fault voltages even if the PWRBTN is released. VHIGH must be sufficiently (about 0.3 V) above

the highest regulated power (normally AVDD) so that regulation can be properly performed.

The PWRBTN state can also be read by software, so it can be used as one of the user interface

buttons.

A power-on reset monitors the core voltage and asserts reset if CVDD drops below the CMON

level. It is also possible to force a reset by keeping PWRBTN pressed for longer than approx-

imately 5.6 seconds. A watchdog counter and the XRESET pin can also generate a reset for

the device.

Resets do not cause the regulators to shut down, but they restore the default regulator voltages.

After boot the firmware and user software can change the voltages.

Return to power-off is possible only with active software control (VSDSP writes the regulator

shutdown bit), or when VHIGH voltage is removed for a sufficiently long time. In the default

firmware player the power button has to be pressed for 2 seconds to make the software power-

down the system and turn the regulators off.

Version: 1.4, 2011-10-06

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