SX1231 SEMTECH [Semtech Corporation], SX1231 Datasheet - Page 74

• Manufacturer Part Number: SX1231
• Description: Low Power Integrated UHF Transceiver
• Manufacturer: SEMTECH [Semtech Corporation]

7.2.2. Manual Reset
A manual reset of the SX1231 is possible even for applications in which VDD cannot be physically disconnected. Pin 6
should be pulled high for a hundred microseconds, and then released. The user should then wait for 5 ms before using the
chip.
Note
7.3. RC Oscillator Calibration
The calibration of the internal oscillator is required when using the Listen mode of the SX1231. The calibration procedure
source code is the following:
7.4. Reference Design
Please contact your Semtech representative for evaluation tools, reference designs and design assistance.
Rev 2 - Nov 2009
ADVANCED COMMUNICATIONS & SENSING
whilst pin 6 is driven high, an over current consumption of up to ten milliamps can be seen on VDD.
/////// RC CALIBRATION (Once at POR) ///////
SetRFMode(RF_STANDBY);
WriteRegister(0x57, 0x80);
WriteRegister(REG_OSC1, ReadRegister(REG_OSC1) | 0x80);
while (ReadRegister(REG_OSC1) & 0x40 == 0x00);
WriteRegister(REG_OSC1, ReadRegister(REG_OSC1) | 0x80);
while (ReadRegister(REG_OSC1) & 0x40 == 0x00);
WriteRegister(0x57, 0x00);
////////////////////////////////////////////
VDD
Pin 6
(input)
Figure 37. Manual Reset Timing Diagram
High-Z
> 100 us
Page 74
’’1’’
High-Z
Wait for
5 ms
Chip is ready from
this point on
DATASHEET
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SX1231