Rainbow Electronics RC1290 User Manual
Page 3
RC1240/1280/1290
2005 Radiocrafts AS
RC1240/RC1280/RC1290 Data Sheet (rev. 1.3)
Page 3 of 17
Pin Assignment
GND
CTS/RXEN/RXTX
RTS/TXEN
CONFIG
TXD/SCL
RXD/SDA
GND
GND
VCC
ON/OFF
VDD
GND
RF
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
15 16 17 18 19 20 21 22
30 29 28 27 26 25 24 23
Pin Description
Pin no Pin name
Description
1
GND
System ground
2
CTS/RXTX/RXEN UART Clear to Send, UART RXTX, Receive Mode Enable, or SLEEP
mode activation. Connect to VDD if not used. Internal 100 k series
resistor.
3
RTS/TXEN
UART Request to Send, Transmit Mode Enable, or SLEEP mode
activation. Connect to VDD if not used. Internal 100 k series
resistor.
4
CONFIG
Configuration Enable. Active low. Should normally be set high.
Connect to VDD if not used. Internal 100 k series resistor.
5
TXD/SCL
UART TX Data, or serial data clock. Internal 100 k series resistor.
6
RXD/SDA
UART RX Data, or serial data I/O. Internal 100 k series resistor.
7
GND
System ground
8
GND
System ground
9
RF
RF I/O connection to antenna
10
GND
System ground
11
VDD
Supply voltage output, regulated. Should normally be left open
12
ON/OFF
Module on/off (shutdown). ON when high, OFF when low. See
important note under Power Management page 5.
13
VCC
Supply voltage input. Internally regulated. Maximum rise-time
requirement apply, see Electrical Specification.
14
GND
System ground
15-21 RESERVED
Test pins or pins reserved for future use.
Do not connect!
22
RESET
Main reset (active low). Should normally be left open. Internal 100 k
pull-up resistor, no series resistor.
23
PA_EN
External PA enable output, active high
24
LNA_EN
External LNA enable output, active high
25-30 RESERVED
Test pins or pins reserved for future use.
Do not connect!
Note 1: In UART mode the TXD and RXD are used for serial data, and CTS/RXTX and RTS for flow control
(optional). If flow control is not used, and RXEN and TXEN are both asserted (active low) the module is set in SLEEP
mode. RXEN and TXEN should be connected to VDD if not used if not used for SLEEP mode activation. A pull-up
resistor is not necessary due to an internal series resistor.
Note 2: In synchronous mode the SCL (data clock) and SDA (Data input and output) are used for serial data.
The RXEN and TXEN pins are then used to select the operation mode of the device. Signals are active low.
Note 3: The CONFIG pin is used to enter configuration mode (change of default settings). Active low.
Note 4: Do not use VDD for supply to external circuits. Should only be used for pull-ups, if required.
Note 5: RXEN, TXEN, CONFIG, TXD and RXD have internal 100 k series resistors. Driving capability when used as
outputs is therefore limited and should be connected to CMOS inputs only.
Note 6: Other digital interfaces may be specified upon request.