| pin | active | function | note |
|---|---|---|---|
| CLK | 3-wire SPI | ||
| MISO | 3-wire SPI | ||
| MOSI | 3-wire SPI | ||
| CS | low | 4-wire SPI |
For the SX1262, the NSS pin (chip select) is active low TTL.
Meaning:
- Idle (not selected): NSS = HIGH
- Active (selected): NSS = LOW
- Level logic: 3.3 V high, 0 V low (since SX1262 is a 3.3 V device — do not feed it 5 V).
From Semtech SX1262 datasheet:
- NSS is internally pulled high by default.
- Every SPI transaction starts when NSS goes low and ends when NSS goes high.
- All SPI data must be clocked while NSS is low.