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參數(shù)資料
| 型號： | LTC4155EUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 22/52頁 |
| 文件大?。?/td> | 473K |
| 代理商： | LTC4155EUFD#PBF |
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LTC4155
29
4155f
Table 3. Interrupt Mask Register
INTERRUPT MASK REGISTER (IMR)
SUB ADDRESS
0x06
REG6
DIRECTION
Write/Clear Interrupt, Read
D7
D6 D5 D4 D3 D2 D1 D0
ENABLE_CHARGER_INT
1
ENABLE_FAULT_INT
1
ENABLE_EXTPWR_INT
1
ENABLE_OTG_INT
1
ENABLE_AT_ILIM_INT
1
ENABLE_INPUT_UVCL_INT
1
Table 4. Interrupt Trigger Sources
MASK CATEGORY
STATUS TRIGGERS
STATUS
REGISTERS
ENABLE_CHARGER_INT
CHARGER_STATUS[2:0]
0x03
ENABLE_FAULT_INT
OVP_ACTIVE
BAD_CELL
OTG_FAULT
NTC_HOT_FAULT
0x03
0x04
ENABLE_EXTPWR_INT
USBSNS_GOOD
WALLSNS_GOOD
EXT_PWR_GOOD
0x04
ENABLE_OTG_INT
OTG_ENABLED
ID_PIN_DETECT
0x03
ENABLE_AT_ILIM_INT
AT_INPUT_ILIM
0x04
ENABLE_INPUT_UVCL_INT
INPUT_UVCL_ACTIVE
0x04
Alternate Default Input Current Limit
ForUSBcompatibleoperation,connectboththeCLPROG1
and CLPROG2 pins to a single 1.21k 1% resistor, as
shown in Figure 5. When input power is applied, the
LTC4155 will default to the 100mA input current limit
mode. The I2C bus master may then subsequently change
the input current limit to any of the other modes listed in
Table 8, where the 500mA and 900mA settings also cor-
respondtoUSBcompatiblecurrentlimits.Ifinputpoweris
removedandreapplied,theLTC4155willonceagaindefault
to 100mA mode until commanded to do otherwise by I2C.
If the 100mA USB default current limit is insufficient for
the application and USB compliance is not necessary, an
alternate non-USB compliant default input current may
be programmed with a second resistor on the CLPROG1
pin, as shown in Figure 6.
The resistor should be sized using the following equation:
RCLPROG1 =
1.200V
IVBUSLIM –IVBUS2
(
)
822
( )
When input power is applied, the LTC4155 will default
to the current limit set by the resistor connected to the
CLPROG1 pin. The I2C bus master may then subsequently
change the input current limit to any of the other modes
listed in Table 8, which require a second 1.21k program-
ming resistor on the CLPROG2 pin. The I2C master may
also change back to the default input current limit at any
time by setting the appropriate USBILIM or WALLILIM
bits to the CLPROG1 mode. If input power is removed
and reapplied at any time, the LTC4155 will again default
to the CLPROG1 custom input current limit.
The contents of USBILIM[4:0] and WALLILIM[4:0] always
contain the currently selected input current modes, which
may be different from the data last written by the I2C bus
master if input power was subsequently removed or was
not present. The I2C bus master can read the above two
registers at any time to determine the active input current
limit mode.
CLPROG2
CLPROG1
LTC4155
4155 F05
Figure 5. USB Default Input Current Limit
OPERATION
CLPROG2
CLPROG1
R2
R1
LTC4155
4155 F06
Figure 6. Non-USB Default Input Current Limit
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