SX1231-31SKB868-EVAL Semtech, SX1231-31SKB868-EVAL Datasheet - Page 80

• Manufacturer Part Number: SX1231-31SKB868-EVAL
• Description: development tool usb kit for sx1231 transceiver...
• Manufacturer: Semtech

9. Chip Revisions
Three distinct chip populations exist and can be identified as follows:
Table 30 Chip Identification
This document describes the behavior and characteristics of the SX1231 V2c. Minor differences can be observed between
the three versions, and they are listed in the following sub sections.
9.1. RC Oscillator Calibration
On the SX1231 V2a, RC calibration at power-up needs to be performed according to the following routine:
This is not required in the version V2b any more, where the calibration is fully automatic.
Rev 4 - Nov 2010
ADVANCED COMMUNICATIONS & SENSING
Chip
Version
V2a
V2b
V2c
/////// 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);
////////////////////////////////////////////
Register Value
@ address 0x10
0x21
0x22
0x23
Lot Codes
(see Figure 3)
W6A114.0B
W6A114.0A ¦ W0N382.00 ¦ W0N386.00
W0P044.00 ¦ W0P051.00 ¦ W0P578.00
W0S264.00 ¦ W0S928.00 ¦ W0N382.00
W0S934.00 ¦ W0T726.00 ¦ W0T724.00
W0V381.00 ¦ W0V379.00
W0S934.01 and all others
¦
W6A114.00
Page 80
¦
W0K976.00
Comment
Limited supply
Limited supply
Running production
DATASHEET
www.semtech.com
SX1231