mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1007

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

40.5.1.4 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):
After a time of T
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.
40.5.1.4.1 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
Freescale Semiconductor, Inc.
Below V
Above V
Above V
If the voltage on D- is...
• updates the STATUS register to reflect phase completion (See
• directly proceeds to the next step in the sequence: detection of a charging port See
• The voltage source V
• The current sink I
• The voltage comparator connects to the USB D- line, comparing it to the voltage
• Updates the STATUS register to reflect that a standard host has been detected with
values.)
Charging Port
V
SEQ_RES = 01. (See
DAT_REF
DAT_REF
DAT_REF
LGC
but below V
Table 40-16. Sampling D- in the Charging Port Detection Phase
.
VDPSRC_ON
Detection.
LGC
DM_SINK
MCF51JF128 Reference Manual, Rev. 2, 03/2011
DP_SRC
Table 40-18
, the module samples the D- line. The T
connects to the D- line
connects to the D+ line
The port is a standard host that does not support the
USB Battery Charging Specification v1.1.
The port is a charging port.
This is an error condition..
Then...
for field values.)
VDPSRC_CON
Preliminary
Chapter 40 USB Device Charger Detection Module (USBDCD)
interval to elapse):
Table 40-18
VDPSRC_ON
Standard Host
Port
Charging Port
Error in Charging
Port Detection
See...
parameter
for field
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