STW4810 datasheet(16/79 Pages) STMICROELECTRONICS

Il numero della parte	STW4810

Spiegazioni elettronici	Power management for multimedia processors

PDF	79 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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16 / 79 page

STw4810

Functional description

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REQUEST_MC ball. STw4810 remains in internal oscillator mode until it receives the

external clock signal on MASTER_CLK ball.

EXT_CLK: When MASTER_CLK is detected, the STw4810 uses this clock as reference and

switches off its internal oscillator to save quiescent. MASTERCLK should remain connected

up to sleep mode.

Sleep: Sleep mode is required by multimedia processor by setting a PWREN at low level.

Then VDDOK is forced to 0, regulators (VCORE, VIO_VMEM) switch to sleep mode and

wait for PWREN at high level (

Figure 4).

Wake-up: From sleep mode, the multimedia processor requests to switch back to Normal

mode. Thus the device restarts its internal oscillator and then switches regulators from sleep

to normal mode and informs multimedia processor with VDDOK at high level (

Figure 4).

Note:

By default VAUX is in stand by mode, pdn_vaux = 0 (Table 18). It can be programmed in

normal mode only by asserted pdn_vaux bit to “1”.

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