Texas Instruments TPS65820 Evaluation Module TPS65820EVM TPS65820EVM Datenbogen
Produktcode
TPS65820EVM
SLVS663B – MAY 2006 – REVISED APRIL 2008
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CHG_CONFIG, ADDRESS=9, ALL BITS R/W
B7
B6
B5
B4
B3
B2
B1
B0
Bit name
VCHG
CHGON
TERM_OFF
ISET1_1
ISET1_0
ISET2
PSEL
CE
(1)
Function
CHARGE
CHARGE
TERMINATION
CHARGE CURRENT SCALING
USB
SELECTED
SYSTEM
VOLTAGE
ENABLE
ENABLE
FACTOR
CURRENT
INPUT
POWER
SELECTION
CONTROL
LIMIT
CURRENT
SELECTION
LIMIT
When 0
4.36 V
CHARGE
TERMINATION
00 = 0.25
10 = 0.75
100 mA
USE USB
BATTERY TO
SUSPENDED
ENABLED
01 = 0.5
11 = 1
CURRENT
SYSTEM
Note: Relative to charge current
LIMIT
programmed by external ISET pin
When 1
4.2 V
CHARGE ON
TERMINATION
500 mA
INPUT
INPUT POWER
resistor.
DISABLED
CURRENT
TO SYSTEM
(1)
LIMIT SET TO
MAXIMUM
(1)
The CE bit state is latched inside the charger control logic (CE latch) during an OUT pin UVLO event, prior to resetting the charge
control register bit CE to its power up default value. The charger CE latch controls the charger and power path state as long as the
TPS65820 is in UVLO mode and an external supply is connected to the charger block. The CE latch is reset to its power-up value
(CE=LO) only when the input power is removed from the charger block. The CE latch is disabled and the CE charge control register bit
sets the charger and power path MOSFETs state when the TPS65820 exits the UVLO mode. This feature avoids a host software loop
when the host algorithm requires a depleted (or absent) battery to be connected to the system bus while input power is present.
control register bit CE to its power up default value. The charger CE latch controls the charger and power path state as long as the
TPS65820 is in UVLO mode and an external supply is connected to the charger block. The CE latch is reset to its power-up value
(CE=LO) only when the input power is removed from the charger block. The CE latch is disabled and the CE charge control register bit
sets the charger and power path MOSFETs state when the TPS65820 exits the UVLO mode. This feature avoids a host software loop
when the host algorithm requires a depleted (or absent) battery to be connected to the system bus while input power is present.
GPIO3, ADDRESS = 1C, ALL BITS R/W. NOTE: ONLY BIT B4 CONTROLS CHARGER-RELATED FUNCTIONALITY
B7
B6
B5
B4
B3
B2
B1
B0
Bit name
GPIO3i/O
GPIO3_LEVEL
LDO0_ENABLE
CHARGE _VLTG
RTC_SET
GPIO2 _INTSRC
GPIO1 _INTSRC
GPIO2 _SM2
Function
SEE
SEE
SEE
CHARGE
RTC_LDO
SEE
SEE
SEE
VOLTAGE
OUTPUT
SELECTION
VOLTAGE
SAFETY BIT
When 0
4.2 V
3.1 V
When 1
4.36 V
2.6 V
CHG_STAT, ADDRESS = A, ALL BITS READ-ONLY – POWER UP DEFAULTS SHOW SYSTEM STATUS WHEN EXITING POWER DOWN
B7
B6
B5
(1)
B4
B3
B2
B1
B0
Bit name
BAT_STAT
(2) (3)
INPUT _PWR
THDPPM_ON
ACPG
USBPG
STAT1
STAT2
INP_OV
Function
BATTERY
SELECTED
THERMAL
AC INPUT
USB INPUT
CHARGE STATUS
AC OR USB
SUPPLEMENT
INPUT
LOOP AND
POWER
POWER
INPUT OVP
MODE STATUS
POWER
DPPM
STATUS
STATUS
DETECTION
STATUS
STATUS
When 0
SUPPLEMENT
AC INPUT
BOTH OFF
AC NOT
USB NOT
00 = FAULT/SUSPEND/OFF
NO OVP
MODE OFF
SELECTED
DETECTED
DETECTED
01 = CHARGE DONE
10 = FAST CHARGE ON
10 = FAST CHARGE ON
When 1
SUPPLEMENT
USB INPUT
DPPM ON OR
AC
USB
OVP
11 = PRECHARGE
MODE ON
SELECTED
THERMAL ON
DETECTED
DETECTED
DETECTED
(1)
The TPS65820 generates a charger status interrupt if a DPPM event occurs.
(2)
The battery supplement is entered when V
(BAT)
– V
(OUT)
> 60 mV (typ), and it ends when V
(BAT)
– V
(OUT)
< 20 mV. When the system
power bus current exceeds the input current limit of the external supply current capability, the supplement mode is set. An oscillatory
behavior for BAT_STAT bit can happen if the battery switch dropout voltage is less than 20 mV (typ) when in supplement mode.
behavior for BAT_STAT bit can happen if the battery switch dropout voltage is less than 20 mV (typ) when in supplement mode.
(3)
The BAT_STAT is always masked internally, and does not generate interrupts
54
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