Datasheet

3
2
Start
Bit
DataBits
UART_TXDn
UART_RXDn
5
DataBits
Bit
Start
4
AM3517, AM3505
www.ti.com SPRS550E –OCTOBER 2009–REVISED MARCH 2013
Table 6-117. Timing Requirements for UARTx Receive
(1)
1.8V, 3.3V
NO. UNIT
MIN MAX
4 t
w(URXDB)
Pulse duration, receive data bit (RXDn) .96U 1.05U ns
5 t
w(URXSB)
Pulse duration, receive start bit .96U 1.05U ns
(1) U = UART baud time = 1/programmed baud rate.
Table 6-118. Switching Characteristics Over Recommended Operating Conditions for UARTx Transmit
(1)
1.8V, 3.3V
NO. PARAMETER UNIT
MIN MAX
UART0 Maximum programmable baud rate f
(baud_15)
5
1 f
(baud)
UART0 Maximum programmable baud rate f
(baud_30)
0.23 mbps
UART0 Maximum programmable baud rate f
(baud_100)
0.115
2 t
w(UTXDB)
Pulse duration, transmit data bit, 15/30/100 pF U - 2 U + 2 ns
3 t
w(UTXSB)
Pulse duration, transmit start bit, 15/30/100 pF U - 2 U + 2 ns
(1) U = UART baud time = 1/programmed baud rate.
Figure 6-55. UART Transmit/Receive Timing
6.6.9.1 UART IrDA Interface
The IrDA module can operate in three different modes:
• Slow infrared (SIR) (≤115.2 Kbits/s)
• Medium infrared (MIR) (0.576 Mbits/s and 1.152 Mbits/s)
• Fast infrared (FIR) (4 Mbits/s)
Copyright © 2009–2013, Texas Instruments Incorporated Timing Requirements and Switching Characteristics 189
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