LTC166X

An Arduino library for LTC1660 and LTC1665, Octal 8-bit and 10-bit DACs.

Overview

LTC166X is an Arduino library for controlling LTC1660 (Octal 8-bit DACs) and LTC1665 (Octal 10-bit DACs).

Both ICs contain 8 DACs (A to H) which can be interfaced with SPI protocol.

DAC Outputs Calculation

DAC outputs can be calculated through the following transfer function:

• LTC1660 : Vout = (k/256) * Vref
  • 'k' value should be in range of 0 to 255 (8-bit range).
• LTC1665 : Vout = (k/1024) * Vref
  • 'k' value should be in range of 0 to 1023 (10-bit range).

How To Use The Library

Include the library, then simply create an object accordingly to each devices number:

#include "LTC166X.h"

LTC1665 ten(6);
LTC1660 eight(7);

Constructor's parameter should be a digital pin number you use for "CS (Chip Select)" pin.

To use this library with other SPI ports, you can simply create a "SPIClass" object then parse them into the 'begin' method:

//ESP32 DEVKIT V1 DEVELOPMENT BOARD SPI PINS
#define MOSI 13
#define SCK 14
#define SS 4

SPIClass esp = SPIClass(HSPI); //HSPI or VSPI
LTC1665 ten(SS);

void setup(){
	//either leave SS as -1 or use SS pin number. 
	//it won't affect the library.
	esp.begin(SCK,-1,MOSI,SS); 
	ten.begin(&esp)
}

^Note that each boards use different SPI pinout. Make sure to check that before coding.

Methods

void begin(SPIClass &spi = SPI);

Initiate the LTC166X library.

Can be configured to use other SPI ports using 'SPIClass' object.
For default SPI port, just leave the parameter blank.

void beginTransactionConfig(uint32_t _clock, uint8_t _bitOrder, uint8_t _dataMode);

Configure the SPI transaction options.

For more info. Check 'SPISettings' in Arduino website.

void setDac(uint8_t ctrl, uint16_t code = 0x00);

Set a DAC output where 'ctrl' is address/control and 'code' is the DAC output.

'address/control' Table:

'ctrl'	Literals	DAC Status	Sleep Status
0x00	DAC_WAKE	No Change	WAKE
0x01	DAC_A	Load DAC A	WAKE
0x02	DAC_B	Load DAC B	WAKE
0x03	DAC_C	Load DAC C	WAKE
0x04	DAC_D	Load DAC D	WAKE
0x05	DAC_E	Load DAC E	WAKE
0x06	DAC_F	Load DAC F	WAKE
0x07	DAC_G	Load DAC G	WAKE
0x08	DAC_H	Load DAC H	WAKE
0x09 to 0x0D	-	No Change	WAKE
0x0E	DAC_SLP	No Change	SLEEP
0x0F	DAC_ALL	Load All DACs with same code	WAKE

^For LTC1660: 'code' parameter shouldn't exceed 255, otherwise will be set back to 255.
^For LTC1665: 'code' parameter shouldn't exceed 1023, otherwise will be set back to 1023.