ACT5830
Rev PrB, 05-Mar-08
SYSTEM MANAGEMENT
Figure 2:
Startup and Shutdown Sequence
CHG_DETECT OR HF_PWR
PWR_ON (PUSH-BUTTON)
REG, LDO2, LDO3 ENABLE
VBUCK, OUT2, OUT3
LDO1 ENABLE
87% of VREG or VOUT2
87% of VOUT1
OUT1
RESET TIMER ENABLE
nRST
65ms
TCXO_EN, RX_EN, TX_EN
OUT4, OUT5, OUT6
I2C PROGRAMMING
PWR_HOLD
nON
Open Drain Outputs
Thermal Overload Protection
The ACT5830 includes two n-channel open drain
outputs (OD1 and OD2) that can be used for driving
external loads such as WLEDs or a vibrator motor,
as shown in the functional diagram. Each of the OD
output are enabled when either it's respective ODIx
pin in driven to a logic high.
The ACT5830 integrates thermal overload protection
circuitry to prevent damage resulting from excessive
thermal stress that may be encountered under fault
conditions, for example. This circuitry disables all
regulators if the ACT5830 die temperature exceeds
160°C, and prevents the regulators
from being enabled until the die temperature drops
by 20°C (typ), after which a normal startup routine
may commence.
nACOK Output
The ACT5830's nACOK output provides a logic-level
indication of the status of the voltage at CHG_IN.
nACOK is an open-drain output which sinks current
whenever VCHG_IN > 4V.
Innovative PowerTM
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