SX1276 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX1276' PDF : 132 Pages View PDF
SX1276/77/78/79
WIRELESS, SENSING & TIMING
DATASHEET
7. Application Information
7.1. Crystal Resonator Specification
Table 45 shows the crystal resonator specification for the crystal reference oscillator circuit of the SX1276/77/78/79. This
specification covers the full range of operation of the SX1276/77/78/79 and is employed in the reference design.
Table 45 Crystal Specification
Symbol Description
Conditions
Min
Typ
Max
Unit
FXOSC XTAL Frequency
-
RS
XTAL Serial Resistance
-
C0
XTAL Shunt Capacitance
-
CFOOT External Foot Capacitance
On each pin XTA and XTB
10
CLOAD Crystal Load Capacitance
6
32
-
MHz
15
100 ohms
1
3
pF
15
22
pF
-
12
pF
Notes - the initial frequency tolerance, temperature stability and aging performance should be chosen in accordance with
the target operating temperature range and the receiver bandwidth selected.
- the loading capacitance should be applied externally, and adapted to the actual Cload specification of the XTAL.
7.2. Reset of the Chip
A power-on reset of the SX1276/77/78/79 is triggered at power up. Additionally, a manual reset can be issued by
controlling pin 7.
7.2.1. POR
If the application requires the disconnection of VDD from the SX1276/77/78/79, despite of the extremely low Sleep Mode
current, the user should wait for 10 ms from of the end of the POR cycle before commencing communications over the SPI
bus. Pin 7 (NRESET) should be left floating during the POR sequence.
Figure 42. POR Timing Diagram
Please note that any CLKOUT activity can also be used to detect that the chip is ready.
Rev. 4 - March 2015
©2015 Semtech Corporation
Page 115
www.semtech.com
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