pflib::Bias Class Reference

The HGC ROC has 4 MAX5825 chips doing the DAC for the bias voltages. More...

#include <Bias.h>

Public Member Functions
	Bias (I2C &i2c, int bus=4)
	Wrap an I2C class for communicating with all the DAC chips. More...
void	initialize ()
	Initialize to standard settings Reference voltage - 4.096V.
void	cmdLED (uint8_t i_led, uint8_t cmd, uint16_t twelve_bit_setting)
	Pass a setting to one LED DAC.
void	cmdSiPM (uint8_t i_sipm, uint8_t cmd, uint16_t twelve_bit_setting)
	Pass a setting to one SiPM DAC.
void	setLED (uint8_t i_led, uint16_t code)
	Set and load the passed CODE for an LED bias. More...
void	setSiPM (uint8_t i_sipm, uint16_t code)
	Set and load the passed CODE for an SiPM bias. More...

Static Public Attributes
static const uint8_t	ADDR_LED_0 = 0x18
	DAC chip addresses. More...
static const uint8_t	ADDR_LED_1 = 0x1A
static const uint8_t	ADDR_SIPM_0 = 0x10
static const uint8_t	ADDR_SIPM_1 = 0x12

Private Attributes
std::vector< MAX5825 >	led_
	LED bias chips.
std::vector< MAX5825 >	sipm_
	SiPM bias chips.

Detailed Description

The HGC ROC has 4 MAX5825 chips doing the DAC for the bias voltages.

Two of the chips handle the 16 LED bias voltages and the other two handle the 16 SiPM bias voltages.

Both the LED and SiPM bias voltages are indexed from 0 to 15. To convert from that index to a chip and DAC index on that chip, just use integer division and modulus.

chip_index = int(index > 7) dac_index = index - 8*chip_index;

Constructor & Destructor Documentation

Bias()

pflib::Bias::Bias	(	I2C &	i2c,
		int	bus = 4
	)

Wrap an I2C class for communicating with all the DAC chips.

The bus is 4 + <board-number>, so we set the default to 4 for the case where we only have one board with bus number 0.

Member Function Documentation

setLED()

void pflib::Bias::setLED	(	uint8_t	i_led,
		uint16_t	code
	)

Set and load the passed CODE for an LED bias.

Uses MAX5825::CODEn_LOADn

This is a common procedure and operates as an example of how to use setLED.

setSiPM()

void pflib::Bias::setSiPM	(	uint8_t	i_sipm,
		uint16_t	code
	)

Set and load the passed CODE for an SiPM bias.

Uses MAX5825::CODEn_LOADn

This is a common procedure and operates as an example of how to use setSiPM.

Member Data Documentation

ADDR_LED_0

const uint8_t pflib::Bias::ADDR_LED_0 = 0x18

static

DAC chip addresses.

DAC chip addresses taken from HGCROC specs.

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The documentation for this class was generated from the following files:

• include/pflib/Bias.h
• src/pflib/Bias.cxx