Data Sheet

INTERFACES
UART
GM02S DATASHEET (PRELIMINARY) PROPRIETARY 11
SEQUANS Communications
High-Speed UARTs Flow Control Signals
• CTS0, CTS1, CTS2, CTS3: resp. UART0, UART1, UART2, UART3 flow
control, Clear-To-Send, active low, of the GM02S. To be connected to the
CTS of the remote UART device. Provision a 1 kOhm pull-down on CTS
pin when flowcontrol is not used. If it is connected to an external compo-
nent (like a RS232 driver), the user should make sure that this component
will present a low level to the GM02S. See Figure 2-6.
• RTS0, RTS1, RTS2, RTS3: resp. UART0, UART1, UART2, UART3 flow
control, Ready-To-Send, active low, of the GM02S. To be connected to the
RTS of the remote UART device. See Figure 2-6.
Figure 2-6 represents the typical implementation for the hardware
flowcontrol.
Figure 2-6: UART Convention and Flow Control
Note: High-Speed UART can be used as low-speed UART, given a
specific software registers configuration and the setting of the
CTS signal to 0. Please contact Sequans customer support for
details.
23 GPIO22/RTS3 GPIO22 RTS3 PVDD_1V8 In/Out BIDIR Out-1,
2mA
UART3
1. Alternate functions will be available in future versions via SW upgrade.
2.UART pad types’s electrical characteristics are detailed in Table 2-15.
Table 2-5: UART Signals (Continued)
Pad #
Pad
Name
Primary
Function
Alternate
Function
1
Power Group
Direction
Pad type
2
State
@reset
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