Information

VBUS
Detect
1
2
3
4
5
6
= 1 s
I
DEV_HCHG_LFS
D P _ P U L L U P
V
DM_SRC
I
DP_SINK
Charging
Host Port
Charger
Detection
Phase
T
UNIT_CON_ELAPSED
Full-
Speed
Portable
USB
Device
a t c h a rg in g h o s t p o rt.
c a u s e D + v o lt a g e t o e x c e e d V
DAT_REF
V
DM_SRC
could turn on if ground currents
I
DEV_DCHG
V B U S a t p o r ta b le
U S B d e v ice
0 m A
D+
D-
C h a rg in g h o s t: V
DAT_REF < V
D
- < V LGC
Dedicated Charging Port
C h a r g in g H o s t P o rt, F S
1 m s
T
UNIT_CON_ELAPSED
=
T
SE
Q_INIT
T
SEQ_INIT
T
DCD_DBNC
C H E C K _ D M
Dedicated Charger
C h a r g in g H o s t
D e d ic a te d C h a r g e r
C h a r g in g H o s t
T
VDPSRC_ON
T
VDPSRC_CON
T
CON_IDPSNK_DIS
T
VDMSRC_DIS
Standard host: V
D
-
< V
DAT REF
T
VDMSRC_EN
lgc_hi
lgc_lo
o ff
on
o ff
on
lgc_hi
lgc_lo
o ff
on
o ff
on
o ff
on
I
SUSP
I
DP_SRC
R
DM_DWN
V
DP_SRC
I
DM_SINK
Data Pin
Contact
Detection
Charging Port
Detection
Charger
Type
Detection
Timeout
Initial
Conditions
Figure 43-9. Full Speed Charger Detection Timing
The following table provides an overview description of the charger detection sequence
shown in the preceding figure.
Functional Description
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
1102 Freescale Semiconductor, Inc.