Datasheet
Table Of Contents
- Table of Contents
- List of Figures
- List of Tables
- 1. Introduction
- 2. Pin Connections
- 3. Specifications
- 4. RF Front End Interface
- 5. Power Distribution
- 6. Clocking
- 7. Detection Engine - Modems
- 8. Digital Interface and Control
- 9. Application Programming Interface
- 10. Application Information
- 11. Packaging Information
- Glossary
SX1302
Datasheet Rev 1.0
DS.SX1302.W.APP June 2019
14 of 31
www.semtech.com
3.5 Digital I/O Specifications
Table 3-5: Digital I/O Specifications
All inputs are floating and should be driven to a proper potential to avoid current leakage in low-power modes. GPIO[i] pins
have a selectable internal 100 kOhms pull-down resistor, when configured as inputs, and they are disabled at Reset.
3.6 Example Reference Design Performance
Disclaimer: the performance specifications listed below are only indicative, and obtained on the reference design
described in Section 10.2 "Reference Block Diagram" on page 24.
Sensitivity is specified with a PER=10%, receiving 12 Byte packets, all under nominal temperature and voltage conditions.
It is measured with a SX1250 front-end, an LNA with 18dB of gain and 1.5 dB of Noise Figure.
IDD_TX_COR
E
Sending data on SX1250 using SF6, average, on VCC_CORE - 7.2 - mA
IDD_TX_IO Sending data on SX1250 using SF6, average, on VCC_IO - 1.4 - mA
IDD_OFF_CO
RE
OFF current, clock is disabled, on VCC_CORE - 3.2 - mA
IDD_OFF_IO On VCC_IO - 10 - uA
FERR
Frequency Offset Tolerance, less than 3dB degradation
2
--
+/-0.25*
BW
Hz
1. Average and Peak current concepts are explained in Section 5. on page 18
2. Capability to receive a LoRa® signal with frequency offset on the carrier, assuming a precision of up to +/-0.5ppm on the reference frequency of
the SX1302-based design. For instance, for LoRa® Bandwidth of 125 kHz, incoming packets can be offset by up to +/-31 kHz.
Symbol Description Conditions Min Typ Max Unit
VIH Input High Voltage - 0.7*VCC_IO - VCC_IO + 0.3 V
VIL Input Low Voltage -0.3 - 0.3*VCC_IO V
VOH Output High Voltage Imax = -8 mA VCC_IO - 0.6 - VCC_IO V
VOL Output Low Voltage I
max = 8mA 0 - 0.4 V
Table 3-6: Reference Design Performance
Symbol Description Min Typ Max Unit
S_SF5_125 SF5 Sensitivity, LoRa 125 kHz bandwidth - -121 - dBm
S_SF6_125 SF6 Sensitivity, LoRa 125 kHz bandwidth - -123.5 - dBm
S_SF7_125 SF7 Sensitivity, LoRa 125 kHz bandwidth - -127 - dBm
S_SF8_125 SF8 Sensitivity, LoRa 125 kHz bandwidth - -129 - dBm
Table 3-4: Performances
Symbol Description Min Typ Max Unit