LTC4156IUFD View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4156IUFD

Dual-Input Power Manager/3.5A LiFePO4 Battery Charger with I2C Control and USB OTG

Linear Technology 

OPERATION

Table 18. External Power (Wall or USB) Available

EXTERNAL POWER (WALL OR USB) AVAILABLE

SUB ADDRESS 0x04

EXT_PWR_GOOD

DIRECTION

Read

POWER AVAILABLE

STATUS

D7 D6 D5 D4 D3 D2

Battery Power

Only

0

External Power

Available*

1

*Never true when On-The-Go step-up converter is active.

REG4

D1 D0

Table 19. USB Input Voltage Valid

USB INPUT VOLTAGE VALID

REG4

SUB ADDRESS

0x04

USBSNS_GOOD

DIRECTION

Read

USBSNS STATUS

D7 D6 D5 D4 D3 D2 D1 D0

USBSNS Voltage

Invalid

0

USBSNS Voltage

Valid*

1

*Will be true with applied input voltage within valid range or On-The-Go

in regulation.

Table 20. WALL Input Voltage Valid

WALL INPUT VOLTAGE VALID

SUB ADDRESS 0x04

WALLSNS_GOOD

DIRECTION

Read

WALLSNS STATUS D7 D6 D5 D4 D3 D2

WALLSNS Voltage

Invalid

0

WALLSNS Voltage

Valid

1

REG4

D1 D0

Table 21. Input Current Limit Status

INPUT CURRENT LIMIT STATUS

REG4

SUB ADDRESS

0x04

AT_INPUT_ILIM

DIRECTION

Read

INPUT CURRENT

LIMIT STATUS

D7 D6 D5 D4 D3 D2 D1 D0

Input Current Limit Inactive

0

Input Current Limit Active

1

LTC4156

Table 22. Input Undervoltage Current Limit (Brownout) Status

INPUT UNDERVOLTAGE CURRENT LIMIT

(BROWNOUT) STATUS

REG4

SUB ADDRESS

0x04

INPUT_UVCL_ACTIVE

DIRECTION

Read

INPUT UNDERVOLTAGE

CURRENT LIMIT STATUS D7 D6 D5 D4 D3 D2 D1 D0

Input UVCL Inactive

0

Input UVCL Active

1

Table 23. Overvoltage Protection Fault

OVERVOLTAGE PROTECTION FAULT

SUB ADDRESS

0x04

OVP_ACTIVE

DIRECTION

Read

INPUT OVERVOLTAGE D7 D6 D5 D4 D3 D2

No Fault

0

Input (USB or WALL)

Overvoltage

1

REG4

D1 D0

Table 24. USB On-The-Go Step-Up Regulator Fault Shutdown

USB On-The-Go STEP-UP REGULATOR FAULT SHUTDOWN REG4

SUB ADDRESS

0x04

OTG_FAULT

DIRECTION

Read

STEP-UP

REGULATOR STATUS D7 D6 D5 D4 D3 D2 D1 D0

No Fault

0

Regulator Over

Current Shutdown

1

Table 25. Battery Unresponsive to Charging

BATTERY UNRESPONSIVE TO CHARGING

SUB ADDRESS

0x04

BAD_CELL

DIRECTION

Read

BATTERY STATUS

D7 D6 D5 D4 D3 D2

No Fault

Low Cell Voltage

Timeout

REG4

D1 D0

0

1

4156f

37

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