FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
capacitor which is connected to V_STDBY. When using
Ni_mh, short-circuit VBATT and LVB to external components
and HVB to GND. When using Li_ion, short-circuit HVB to
VBATT, and leave LVB open. When using Ni_MH, the VB
voltage is output from V_STDBY in Standby mode. When
using Li-Ion, 50% of the VBATT voltage is output to
V_STDBY pin in Standby Mode.
Table 8. HVB and LVB Connection
MODE
HVB
LVB
Li_ion
Ni_mh
VBATT(27)
GND
open
VBATT(27)
Notes
27. Externally connect to VBATT.
Table 9. V_STDBY and LSWO Operation
INPUT
OUTPUT
V_STDBY
WAKE(Int)
PGOOD2(Int)
CLEAR
LSWO
L
H
H
H
X
L
X
X
L
VBATT
VBATT
Z
Z
Z
L
H
H
VO1_SENSE
VO1_SENSE
H
Z : High Impedance, X : Don’t care
RESET CIRCUIT
PGOOD1_DELAY,
PGOOD2_DELAY
VO1_SENSE
VO1_SENSE,
VO2_SENSE
VGATE
PGOOD1, 2
RESET1_TH
VO1_SENSE
Reset
Control
PGOOD1_DELAY,
PGOOD2_DELAY
(PGOOD1 side only)
BANDGAP
REFERENCE
PGOOD1, 2B(Int)
Figure 8. Reset Circuit Block Diagram
When the VO1_SENSE or VO2_SENSE voltage is higher
than the reference value, PGOOD1 or 2B goes High. When
PGOOD1(int) is Low and PGOOD1 is High, SLEEP(int) is
forced to place the chip into the standby mode.
Connect the capacitor between RESET1_TH and PGOOD
as directed below.
When SEQ_SELECT is Low:Between RESET1_TH and
PGOOD1_DELAY
Connect a capacitor between RESET1_TH and
PGOOD_DELAY. The capacitor is not necessary if a resistor
of 330KΩ or less is inserted between RESET1_TH and
VO1_SENSE for reset adjustment
When SEQ_SELECT is High:Between RESET1_TH and
PGOOD2_DELAY
Use a capacitor with approximately half of the capacitance
between PGOOD_DELAY and GND
18730
Analog Integrated Circuit Device Data
Freescale Semiconductor
18
FREESCALE [ Freescale ]
