USB Registers
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16.5.4.5 CHRG_DET Register (offset = 14h) [reset = 0h]
CHRG_DET is shown in Figure 16-138 and described in Table 16-149.
this is the charger detect register. this register is not used in the dead battery case.
Figure 16-138. CHRG_DET Register
31 30 29 28 27 26 25 24
Reserved USE_CHG_DET_RE DIS_CHG_DET SRC_ON_DM SINK_ON_DP CHG_DET_EXT_CTL RESTART_CHG_DET
G
R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h
23 22 21 20 19 18 17 16
CHG_DET_DONE CHG_DETECTED DATA_DET Reserved CHG_ISINK_EN CHG_VSRC_EN COMP_DP
R-0h R-0h R-0h R/W-0h R/W-0h R/W-0h R-0h
15 14 13 12 11 10 9 8
COMP_DM CHG_DET_OSC_CNTRL CHG_DET_TIMER
R-0h R/W-0h R/W-0h
7 6 5 4 3 2 1 0
CHG_DET_TIMER Reserved CHG_DET_ICTRL CHG_DET_VCTRL FOR_CE
R/W-0h R/W-0h R/W-0h R/W-0h R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 16-149. CHRG_DET Register Field Descriptions
Bit Field Type Reset Description
31-30 Reserved R/W 0h
29 USE_CHG_DET_REG R/W 0h Use bits
28-24 and
18-17 from this register
28 DIS_CHG_DET R/W 0h When read, returns current value of charger detect input.
When USE_CHG_DET_REG = 1 , the value written to this field
overrides the corresponding charger detect input.
27 SRC_ON_DM R/W 0h When read, returns current value of charger detect input.
When USE_CHG_DET_REG = 1 , the value written to this field
overrides the corresponding charger detect input.
26 SINK_ON_DP R/W 0h When read, returns current value of charger detect input.
When USE_CHG_DET_REG = 1 , the value written to this field
overrides the corresponding charger detect input.
25 CHG_DET_EXT_CTL R/W 0h When read, returns current value of charger detect input.
When USE_CHG_DET_REG = 1 , the value written to this field
overrides the corresponding charger detect input.
24 RESTART_CHG_DET R/W 0h
Restart the charger detection protocol when this goes from 0 to 1
23 CHG_DET_DONE R 0h
Charger detect protocol has completed
22 CHG_DETECTED R 0h
Same signal as CE
21 DATA_DET R 0h
Output of the data det comparator
20-19 Reserved R/W 0h
18 CHG_ISINK_EN R/W 0h When read, returns current value of charger detect input.
When USE_CHG_DET_REG = 1 , the value written to this field
overrides the corresponding charger detect input.
17 CHG_VSRC_EN R/W 0h When read, returns current value of charger detect input.
When USE_CHG_DET_REG = 1 , the value written to this field
overrides the corresponding charger detect input.
16 COMP_DP R 0h
Comparator on the DP line value
15 COMP_DM R 0h
Comparator on the DM line value
14-13 CHG_DET_OSC_CNTRL R/W 0h
Charger detect osc control
1908
Universal Serial Bus (USB) SPRUH73H–October 2011–Revised April 2013
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