Datasheet

LTC4156
37
4156f
Table 18. External Power (Wall or USB) Available
EXTERNAL POWER (WALL OR USB) AVAILABLE REG4
SUB ADDRESS 0x04 EXT_PWR_GOOD
DIRECTION Read
POWER AVAILABLE
STATUS D7 D6 D5 D4 D3 D2 D1 D0
Battery Power
Only
0
External Power
Available*
1
*Never true when On-The-Go step-up converter is active.
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 REG4
SUB ADDRESS 0x04 WALLSNS_GOOD
DIRECTION Read
WALLSNS STATUS D7 D6 D5 D4 D3 D2 D1 D0
WALLSNS Voltage
Invalid
0
WALLSNS Voltage
Valid
1
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
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 REG4
SUB ADDRESS 0x04 OVP_ACTIVE
DIRECTION Read
INPUT OVERVOLTAGE D7 D6 D5 D4 D3 D2 D1 D0
No Fault 0
Input (USB or WALL)
Overvoltage
1
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 REG4
SUB ADDRESS 0x04 BAD_CELL
DIRECTION Read
BATTERY STATUS D7 D6 D5 D4 D3 D2 D1 D0
No Fault 0
Low Cell Voltage
Timeout
1
OPERATION