* Pullup is connected to an internal supply, V
CCINT
. (V
CCINT
= V
CAP
if V
CAP
> V
CCINT_TH
, or V
CCINT
= V
BAT
if V
CAP
< V
CCINT_TH
).
** PwrRstCfg[3:0] is read-only; the functions of PFN1 and PFN2 cannot be changed through I
2
C
Table 1. Power Function Input Control Modes
PwrRstCfg[3:0]**
PFN1**
PFN1 PU/PD
PFNxResEna = 1
PFN2**
PFN2 PU/PD
PFNxResEna = 1
Available PwrCmd
OFF
HARD SOFT
On/
Off
ENABLE
PULLDOWN
Manual
Reset
PULLUP*
NO
NO
YES
On/Off Mode with 10ms debounce. PFN1 is the active-high on/off control input. PFN2 is the active-low soft-
reset input.
On
/Off
DISABLE
PULLUP*
Manual
Reset
PULLUP*
NO
NO
YES
On/Off Mode with 10ms debounce. PFN1 is the active-low on/off control. PFN2 is the active-low soft-reset
input.
AON
Hard-Reset on PFN1
Rising
PULLDOWN
Soft-Reset on
PFN2 Rising
PULLDOWN
YES
YES
YES
Always-On Mode. A rising edge on PFN1 generates a hard reset after a 200ms delay. A rising edge on PFN2
generates a soft-reset after a 200ms delay. In this mode, the device can only enter the off state by writing to
the PwrCmd register.
AON
Hard-Reset on PFN1
Falling
PULLUP*
Soft-Reset on
PFN2 Falling
PULLUP*
YES
YES
YES
Always-On Mode. A falling edge on PFN1 generates a hard-reset after a 200ms delay. A falling edge on PFN2
generates a soft-reset after a 200ms delay. In this mode, the device can only enter the off state by writing to
the PwrCmd register.
CR High
Hard-Reset on CHGIN
insertion When PFN1
High
PULLDOWN
Soft-Reset CHGIN
Insertion When
PFN2 High
PULLDOWN
YES
YES
YES
Charger Reset High Mode. When PFN1 is high, a CHGIN insertion generates a hard-reset after a 200ms
delay. When PFN2 is high, a CHGIN insertion generates a soft-reset after a 200ms delay. In this mode, the
device can only enter the off state by writing to the PwrCmd register.
CR Low
Hard-Reset on CHGIN
Insertion
When PFN1 low
PULLUP*
Soft-Reset on
CHGIN Insertion
When PFN2 Low
PULLUP*
YES
YES
YES
Charger Reset Low Mode. When PFN1 is low, a CHGIN insertion generates a Hard-Reset after a 200ms
delay. When PFN2 is low, a CHGIN insertion generates a Soft-Reset after a 200ms delay. In this mode, the
device can only enter the off state by writing to the PwrCmd register.
KIN
KIN
PULLUP*
KOUT
NONE
YES
YES
YES
Custom Button Mode. PFN1 is the active-low
KIN
button input. PFN2 is the open-drain
KOUT
output, which
buffers the
KIN
input. The device can enter the off state by either a
KIN
press (>12s) or by writing to the
PwrCmd register. A CHGIN insertion or a
KIN
press (>400ms) can exit the off state.
CSR1
KIN
PULLUP*
KOUT
NONE
YES
NO
NO
Custom Soft Reset 1. PFN1 is the active-low
KIN
button input. PFN2 is the open-drain
KOUT
output, which
buffers the
KIN
input. A
KIN
press (>12s) generates a soft-reset. The device can only enters the off state
through the PwrCmd register. A CHGIN insertion or a
KIN
press (>3s) can exit the off state.
CSR2
KIN
PULLUP*
Manual
Reset
NONE
YES
YES
YES
Custom Soft-Reset 2. PFN1 is the active-low
KIN
button input. PFN2 is the active-low soft-reset input. A PFN2
press (>12s) generates a soft-reset. In this mode, the device can only enter the off state by writing to the
PwrCmd register.
MAX20335
PMIC with Ultra-Low I
Q
Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
www.maximintegrated.com
Maxim Integrated
│
28
