Datasheet

UART_TX
DM
DP
UART_RX
UART_CTS
RTSO
CTSI
UART_RTS
CK5 CK6
CK7 CK8
CK9 CK10
CK11 CK12
032-051
TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
Figure 7-4 shows the MCPC UART and handshake mode timings.
Figure 7-4. MCPC UART and Handshake Mode Timings
7.2.2 USB-CEA Carkit Port Timing
CEA carkit mode lets the link communicate through the USB PHY to a remote carkit in CEA audio + data
during audio (DDA) mode as defined in the CEA-936A specification. In this mode, the ULPI data bus is
redefined as a 2-pin UART interface, which exchanges data through a direct access to the FS/LS analog
transmitter and receiver.
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 7-2 assumes testing over the recommended operating conditions (see the CEA-936A specification).
Table 7-2. 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 (DDA 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
DDA polarity 20 60 ms
t
ACC_COL_DET
Accessory identification (ID) collision detect 2 3 ms
Copyright © 2008–2011, Texas Instruments Incorporated USB HS 2.0 OTG Transceiver 103
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