SX1232 查看數據表（PDF） - Semtech Corporation

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SX1232

868 & 915MHz Ultra Low Power High Link Budget Integrated UHF Transceiver

Semtech Corporation 

SX1232

WIRELESS & SENSING

DATASHEET

7. Application Information

7.1. Crystal Resonator Specification

Table 32 shows the crystal resonator specification for the crystal reference oscillator circuit of the SX1232. This

specification covers the full range of operation of the SX1232 and is employed in the reference design.

Table 32 Crystal Specification

Symbol Description

Conditions

Min

Typ

Max

Unit

FXOSC XTAL Frequency

-

32

-

MHz

RS

XTAL Serial Resistance

-

C0

XTAL Shunt Capacitance

-

CFOOT External Foot Capacitance On each pin XTA and XTB

8

CLOAD Crystal Load Capacitance

6

30

140 ohms

2.8

7

pF

15

22

pF

-

12 pF

Notes - the initial frequency tolerance, temperature stability and ageing 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 SX1232 is triggered at power up. Additionally, a manual reset can be issued by controlling pin 6.

7.2.1. POR

If the application requires the disconnection of VDD from the SX1232, 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 6

(Reset) should be left floating during the POR sequence.

VDD

Pin 6

(output)

Undefined

Wait for Chip is ready from

10 ms this point on

Figure 37. POR Timing Diagram

Please note that any CLKOUT activity can also be used to detect that the chip is ready.

Rev 3 - August 2012

Page 81

www.semtech.com

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