Datasheet

ULPI
DATA0:UART_TX
DATA1:UART_RX
Device
USB-CEA connector
DP/RXD/MIC
DM/TXD/SPKR
037-048
TPS65930/TPS65920
SWCS037G–MAY 2008– REVISED APRIL 2011 www.ti.com
UART data are sent and received on the USB D+/D– pads. D+/D– are also used in this mode to carry
audio I/O signals.
Table 7-3 assumes testing over the recommended operating conditions (see the CEA-936A specification).
Table 7-3. USB-CEA Carkit Interface Timing Parameters
Parameter Min Max Unit
t
PH_DP_CON
Phone D+ connect time 100 ms
t
CR_DP_CON
Carkit D+ connect time 150 300 ms
t
PH_DM_CON
Phone D– connect time 10 ms
t
PH_CMD_DLY
Phone command delay 2 ms
t
PH_MONO_ACK
Phone mono acknowledge 10 ms
t
PH_DISC_DET
Phone D+ disconnect time 150 ms
t
CR_DISC_DET
Carkit D– disconnect detect 50 150 ms
t
PH_AUD_BIAS
Phone audio bias 1 ms
t
CR_AUD_DET
Carkit audio detect 400 800 μs
t
CR_UART_DET
Carkit UART detect (data-during-audio enabled) 700 1200 ns
t
PH_STLO_DET
Phone stereo D+ low detect 30 100 ms
t
PH_PLS_POS
Phone D– interrupt pulse width 200 600 ns
t
CR_PLS_NEG
Carkit D+ interrupt pulse width 200 600 ns
t
DAT_AUD_POL
Data-during-audio polarity 20 60 ms
t
ACC_COL_DET
Accessory ID collision detect 2 3 ms
t
ACC_INT_PW
Accessory ID interrupt pulse width 200 400 μs
t
ACC_INT_WAIT
Accessory ID interrupt wait time 10 15 ms
t
ACC_CMD_WAIT
Accessory ID command wait time 0 ms
t
PH_INT_PW
Phone ID interrupt pulse width 4 8 ms
t
PH_INT_WAIT
Phone ID interrupt wait time 4 8 ms
t
PH_CMD_WAIT
Phone ID command wait time 0 ms
t
PH_UART_RPT
Phone command repeat time 50 ms
t
CR_UART_RSP
Carkit UART response 30 ms
t
CR_INT_RPT
Carkit interrupt repeat time 50 ms
f
UART_DFLT
Default UART signaling rate (typical rate) 9600 bps
Figure 7-4 shows the USB-CEA carkit UART data flow.
Figure 7-4. USB-CEA Carkit UART Data Flow
Table 7-4 lists the USB-CEA carkit UART timings.
72 USB Transceiver Copyright © 2008–2011, Texas Instruments Incorporated
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