• updates the STATUS register to reflect phase completion (See
for field
values.)
• directly proceeds to the next step in the sequence: detection of a charging port See
.
48.5.1.4 Charging Port Detection
Once it is known that the data pins have made contact, the module waits for a fixed delay
of 1 ms, and then attempts to detect if it has been plugged into a charging port. The
module connects the following analog units to the USB D+ or D- lines during this phase
(when the usbdcd_en and usbdcd_chg_det_en signals are asserted high):
• The voltage source V
DP_SRC
connects to the D+ line
• The current sink I
DM_SINK
connects to the D- line
• The voltage comparator connects to the USB D- line, comparing it to the voltage
V
DAT_REF
.
After a time of T
VDPSRC_ON
, the module samples the D- line. The T
VDPSRC_ON
parameter
is programmable and defaults to 40 ms. After sampling the D- line, the module
disconnects the voltage source, current sink, and comparator.
The next steps in the sequence depend on the voltage on the D- line as determined by the
voltage comparator. See the following table.
Table 48-16. Sampling D- in the Charging Port Detection Phase
If the voltage on D- is...
Then...
See...
Below V
DAT_REF
The port is a
standard host
that does not support the
USB Battery Charging Specification v1.1.
Above V
DAT_REF
but below V
LGC
The port is a
charging port
.
Above V
LGC
This is an error condition..
Error in Charging
Port Detection
48.5.1.4.1 Standard Host Port
As part of the charger detection handshake with a standard USB host, the module does
the following (without waiting for the T
VDPSRC_CON
interval to elapse):
• Updates the STATUS register to reflect that a standard host has been detected with
for field values.)
Functional Description
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
1322
Freescale Semiconductor, Inc.
Содержание K53 Series
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