Samsung RL37Lx Manuale Utente Scaricare il pdf (Pagina 28)

Confidential MAX8698C, Rev08

Page 28/47

DO NOT COPY. DO NOT DISTRIBUTE 12/8/2009

After I2C is enabled, all regulators can be enabled or disabled via I2C. In the figure6, LDO4/7 are turned on by

I2C and can be turned off individually.

Note that OTGi (LDO3) is recommended to turn on before OTG(LDO8) according to Samsung S5PC100 power

requirements. It is not recommended turning on both OTGi and OTG at same time.

PWRHOLD triggering power down sequence

The normal way of powering off MAX8698C is by PWRHOLD going low.

If PWRHOLD = logic low, the nRESET is pulled low and the power–down sequence is initiated.

The following will trigger the PMIC to transition from active condition to off condition

• Falling threshold level on PWRHOLD & Low level of PWRON switch (See Figure 5)

• Falling threshold level on PWRON & Low level of PWRHOLD (See Figure 6)

• Internal temperature exceeding thermal limit

• LDO9 going out of regulation

• UVLO

Figure 5. Power up/down sequence

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Samsung RL37Lx Manuale Utente Pagina 28