FAN54300 Datasheet, PDF (34/43 Pages) Fairchild Semiconductor – USB-Compliant, Dual-Power Input, Single-Cell, Li-Ion Switching Charger with USB-OTG Boost Regulator

Register Bit Definitions
Bit Name Type
Description
CONTROL0_U
Reg Addr: 0
Slave Addr: D6 Default = x1xx xxxx
TMR_RST W Writing a 1 resets the t32SEC timer. Writing a 0 has no effect.
7
OTG
R Returns the OTG pin level (1 = OTG pin HIGH)
0: STAT pin does not go LOW when charging from USB source.
6 EN_STU R/W _{1: STAT pin function is enabled.}
USB charger status
Table 13. USB Charger Status Bits
5:4 STAT_U R
00
Normal (no fault) / Ready
01
Charge in progress from USB source
10
Charge done
11
USB charger fault
3 BOOST
0: OTG boost is not active.
R _{1: OTG boost is active.}
Delineates USB Charger and OTG Boost Faults
Table 14. USB Fault Bits
Bits
210
Charger Mode
Boost Mode
0 0 0 Normal (no fault)
Normal (no fault)
2:0 FAULT_U R
0 0 1 VBUS > VBUSOVP
VBUS > VBUSOVP
0 1 0 Sleep Mode: VBUS < VBAT Boost overload
0 1 1 Poor USB input source VBAT < UVLOBST
1 0 0 Battery OVP
N/A: This code will not appear
1 0 1 Thermal shutdown
Thermal shutdown
1 1 0 Timer fault
Timer fault
1 1 1 No battery
N/A: This code will not appear
Note:
7. Default values are in bold text.
© 2010 Fairchild Semiconductor Corporation
FAN54300 • Rev. 1.0.4
34
www.fairchildsemi.com