LTC4155 datasheet(29/52 Pages) LINER

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LTC4155

4155fc

Table 3. Interrupt Mask Register

INTERRUPT MASK REGISTER (IMR)

SUB ADDRESS

0x06

REG6

DIRECTION

Write/Clear Interrupt, Read

ENABLE_CHARGER_INT

ENABLE_FAULT_INT

ENABLE_EXTPWR_INT

ENABLE_OTG_INT

ENABLE_AT_ILIM_INT

ENABLE_INPUT_UVCL_INT

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

For USB compatible operation, connect both the CLPROG1

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-

respond to USB compatible current limits. If input power is

removed and reapplied, the LTC4155 will once again default

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 –IVBUSQ

()

• 991

()

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

LTC4155

4155 F06

Figure 6. Non-USB Default Input Current Limit

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