DP1283C433 Semtech, DP1283C433 Datasheet - Page 9

• Manufacturer Part Number: DP1283C433
• Description: MODULE DROP IN FOR XE1283 433MHZ
• Manufacturer: Semtech

Specifications of DP1283C433

• Frequency: 433MHz
• Data Rate - Maximum: 153.2kbps
• Applications: ISM
• Power - Output: 11dBm
• Sensitivity: -111dBm
• Voltage - Supply: 2.4 V ~ 3.6 V
• Current - Receiving: 14mA
• Current - Transmitting: 40mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Modulation Or Protocol: -

4.1
The drop-in module DP1283 can be programmed using the 3-wire bus or the pin SWITCH. This section describes the
switching sequence from Mode 1 to Mode 2.
4.2
In most applications, the CPU clock will be given by the on-chip RC oscillator combined with the pre-mounted 32 kHz
oscillator for calibration (connected between pins XIN and XOUT).
For specific applications where an external clock is required, the 32 kHz crystal has to be removed and the external
CPU clock signal can be injected on XIN pin.
4.3
In both cases the Antenna switch embedded on the DP1283 is by default driven by the microcontroller through PB4 and
PB5.
However, it is possible to drive the antenna switch externally via RX and TX pins. In this case, two resistors have to be
moved as explained on the following table:
© Semtech 2005
Switching sequence using the 3-wire bus
Switch_ext = 0 (Bit 3, Address 00010)
Switching sequence using pad SWITCH
Switch_ext = 1 (Bit 3, Address 00010)
STANDARD SEQUENCE FOR SWITCHING BETWEEN RECEIVER AND TRANSMITTER
MICROCONTROLLER CLOCK
ANTENNA SWITCH
R4, R5
R1, R3
Truth Table:
Switch driven internally (PB4 & PB5)
PB4
1
0
0 Ω
NC
PB5
0
1
Receiver mode
Transmitter mode
9
Switch driven externally (RX & TX pins)
NC
0Ω
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DP1283