User's Manual

User manual of 3G SEP EVDO module
Page 33
pins/function
MPP_XX (selectable) 0.1 to 1.7 1 0.1 to 1.7
MPP_XX (selectable) 0.3 to VPH_PWR 1/3 0.1 to 1.7
4.9 UART
TX, RX, CTS, and RFR have the following characteristics:
Signal VL (V) VH (V)
Min Max Min Max
UART_TX -0.3 0.4 1.5 2.1
UART_RX -0.3 0.4 1.5 2.1
UART_RFR -0.3 0.4 1.5 2.1
UART_CTS -0.3 0.4 1.5 2.1
4.10 SPI
The SPI allows duplex (or half-duplex) and synchronous serial communication
between a master and a slave.
3G SEP can be configured as an SPI master or slave mode.
Figure 8: SPI in the master mode
Parameter Comments Minimum Maximum Unit
1/T SPI clock frequency - 26 MHz
T
SPI clock period
38 - ns
t(ch) Clock high 0.45xT 0.55xT ns
t(cl) Clock low 0.45xT 0.55xT ns