SX1240, Rev 1, Oct 2010

©2010 Semtech Corp.

SX1240

www.semtech.com

Page 8

Integrated Transmitter IC

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

3. Application Modes

The SX1240 has two application modes. These are selected depending upon the load presented to the Control pin (6) at

power-on of the device, as shown on Figure 3. By connecting the Control pin to logical ‘0’ or ‘1’ the Power & Go mode is

selected. A full description of operation in this mode is given in Section 3.1. By presenting a logical zero to the Control

input, Advanced Mode can be accessed by subsequent clocking of the control pin, in conjunction with the Data pin (2)

permits programming of the SX1240 configuration register and manual control of the transmitter. For more information on

Advanced Mode operation please consult Section 3.2. The diagram below summarises the mode selection process.

Figure 3. SX1240 Mode Selection

Table 6

Control Pin Selection of the Application Mode

CTRL Pin (6)

Application Mode

Logic ‘1’ or ‘0’

Power & Go Mode (see Section 3.1)

Logic ‘0’ then Clock on CTRL

Advanced Mode (see Section 3.2)