Datasheet

ULPI
DATA0:UART_TX
DATA1:UART_RX
Device USB-CEA
connector
DP/RXD/MIC
DM/TXD/SPKR
032-052
UART_TX
DM
DP
UART_RX
CK1 CK2
CK3 CK4
032-053
TPS65950
SWCS032E–OCTOBER 2008–REVISED JANUARY 2011 www.ti.com
Table 7-2. USB-CEA Carkit Interface Timing Parameters (continued)
Parameter Min Max Unit
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 7-5 shows the USB-CEA carkit UART data flow.
Figure 7-5. USB-CEA Carkit UART Data Flow
Table 7-3 lists the USB-CEA carkit UART timing parameters.
Table 7-3. USB-CEA Carkit UART Timing Parameters
Notation Parameter Min Max Unit
CK1 t
d(UART_TXH-DM)
Delay time, UART_TX rising edge to DM transition 4.0 11 ns
CK2 t
d(UART_TXL-DM)
Delay time, UART_TX falling edge to DM transition 4.0 11 ns
At 38.4 MHz 205 234
CK3 t
d(DPH-UART_RX)
Delay time, DP rising edge to UART_RX transition ns
At 19.2 MHz 310 364
At 38.4 MHz 205 234
CK4 t
d(DPL-UART_RX)
Delay time, DP falling edge to UART_RX transition ns
At 19.2 MHz 310 364
Figure 7-6 shows the USB-CEA carkit UART timings.
Figure 7-6. USB-CEA Carkit UART Timing Parameters
104 USB HS 2.0 OTG Transceiver Copyright © 2008–2011, Texas Instruments Incorporated
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