User's Manual

Table Of Contents
RB4000 Interface Signal Level Definitions
Note: I/O is DTE not DCE. RTS and CTS functionality is for Hardware Flow
Control.
13
Pin # Pin Name Type Description I/O Voltage Range
1 GND - Ground -
2 Reserved -
3 GND - Ground -
4 Reserved -
5 Reserved -
6 RESET I Reset if low for more than
5ms
Vil: 0V ~ 0.3 x VDD
Vih: 0.7 x VDD
7 SPI_MISO O Synchronous serial interface
data output
Vol: 0V ~ 0.2V
Voh: VDD – 0.2V ~ VDD
8 SPI_CSB I Chip select for Synchronous
Serial Interface
active low
Vil: 0V ~ 0.3 x VDD
Vih: 0.7 x VDD
9 SPI_CLK I Synchronous serial interface
clock
Vil: 0V ~ 0.3 x VDD
Vih: 0.7 x VDD
10 SPI_MOSI I Synchronous serial interface
data input
Vil: 0V ~ 0.3 x VDD
Vih: 0.7 x VDD
11 UART_CTS I UART clear to send active
low
Vil: 0V ~ 0.3 x VDD
Vih: 0.7 x VDD
12 UART_TX O UART data output Vol: 0V ~ 0.2V
Voh: VDD – 0.2V ~ VDD
13 UART_RTS O UART request to send
active low
Vol: 0V ~ 0.2V
Voh: VDD – 0.2V ~ VDD
14 UART_RX I UART data input Vil: 0V ~ 0.3 x VDD
Vih: 0.7 x VDD
15 Reserved O
16 VDD PWR Supply voltage 2.2V ~ 4.2V
17 GND - Ground
18 Reserved -
19 Reserved -
20 Reserved -
21 Reserved -
22 Reserved -
23 Reserved -
24 Reserved -
25 Reserved -
26 Reserved -
27 Reserved -
28 Reserved -
29 Reserved -
30 Reserved -
31 Reserved -
32 Reserved -
33 Reserved -
34 Reserved -
35 LINK LED O Link LED Output Vol: 0V ~ 0.2V
Voh: VDD – 0.2V ~ VDD
36 GND - Ground -