Datasheet

HOST MCU
UART
RTS
CTS
TX
RX
H_IRQ
CC3100 SL
UART
RTS
CTS
TX
RX
H_IRQ
SWAS031-090
X
X
HOST MCU
UART
RTS
CTS
TX
RX
H_IRQ
CC3100 SL
UART
RTS
CTS
TX
RX
H_IRQ
SWAS031-089
X
HOST MCU
UART
RTS
CTS
TX
RX
HOST_INTR(IRQ)
CC3100 SL
UART
RTS
CTS
TX
RX
HOST_INTR(IRQ)
SWAS031-088
CC3100
SWAS031D –JUNE 2013–REVISED FEBRUARY 2015 www.ti.com
4.13.1 5-Wire UART Topology
Figure 4-17 shows the typical 5-wire UART topology comprised of 4 standard UART lines plus one IRQ
line from the device to the host controller to allow efficient low power mode.
Figure 4-17. Typical 5-Wire UART Topology
This is the typical and recommended UART topology because it offers the maximum communication
reliability and flexibility between the host and the SimpleLink device.
4.13.2 4-Wire UART Topology
The 4-wire UART topology eliminates the host IRQ line (see Figure 4-18). Using this topology requires
one of the following conditions to be met:
• Host is always awake or active.
• Host goes to sleep but the UART module has receiver start-edge detection for auto wakeup and does
not lose data.
Figure 4-18. 4-Wire UART Configuration
4.13.3 3-Wire UART Topology
The 3-wire UART topology requires only the following lines (see Figure 4-19):
• RX
• TX
• CTS
Figure 4-19. 3-Wire UART Topology
Using this topology requires one of the following conditions to be met:
• Host always stays awake or active.
24 Specifications Copyright © 2013–2015, Texas Instruments Incorporated
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