LLCC68 datasheet(54/111 Pages) SEMTECH

54 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

54 of 111

Semtech

LLCC68

www.semtech.com

8.6 DIO3 as a Manual Switch Control

DIO3 can be controlled via several register accesses. Simply perform the following steps to configure DIO3:

1. Set bit 3 of register@0x0580 to 1 (output enable on DIO3).

2. Set bit 3 of register@0x0583 to 0 (input disable on DIO3).

3. Set bit 3 of register@0x0584 to 0 (pull-up disable on DIO3).

4. Set bit 3 of register@0x0585 to 0 (pull-down disable on DIO3).

5. Set bits [0 to 2] of register@0x0920 to the output voltage you need on DIO3 (see Table 13-35, “tcxoVoltage Configuration Definition,”

on page 81).

To set the level of DIO3:

• Set bit 3 of register@0x0920 to 1 to have DIO3 high

• Set bit 3 of register@0x0920 to 0 to have DIO3 low

The configuration step is performed at PoR and each time the chip comes from SLEEP mode (because the state machine overwrites this

custom configuration). For instance, if you want to configure DIO3 as a 3V output:

1. Write(0x0580, Read(0x0580) | 0x08);

2. Write(0x0583, Read(0x0583) & ~0x08);

3. Write(0x0584, Read(0x0584) & ~0x08);

4. Write(0x0585, Read(0x0585) & ~0x08);

5. Write(0x0920, 0x06); // 0x06 for "DIO3 outputs 3.0 V"

To set DIO3 high: write(0x0920, read(0x0920) | 0x08);

To set DIO3 low: write(0x0920, read(0x0920) & ~0x08);

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