HL5266A

GENERAL DESCRIPTION

HL5266A is a 3 channel LED driver with 8 bits device address identifier. There are 3 independent constant current LED drivers with 5 bits PWM color brilliance controllers. A common 8 bits PWM brightness controller is used to control the 3 LED drivers simultaneously. A serial data input port is used to receive control data for LED driver, and a serial data output port provides cascade serial data transformation. There is an oscillator resister built in HL5266A to reduce the number of external components. The power supply cascade is allowed in series connection application.

FEATURES

3 channel LED driver
8 bits device address
3 5-bits PWM color brilliance controllers
8 bits PWM brightness controller
Serial data input and output ports
Built-in oscillator resister
Power supply cascade design

APPLICATION

LED Light Bar
LED Light Strip
LED Light String
LED Moving Sign
LED Decoration Lamp
Christmas LED Light

ABSOLUTE MAXIMUM RATING

Power Supply -------------------------- 6V
Input Voltage -------------------------- (VSS -0.3V) to (VDD +0.3V)
Operating Temperature ----------------- -40℃ to 40℃
Storage Temperature ------------------ - 65℃ to 125℃

ELECTRICAL CHARACTERISTICS

SYMBOL	DESCRIPTION	TEST CONDITION	MIN	TYP	MAX	UNITS
VDD	Supply Voltage		4.5	5	5.5	V
VDIL	Input Voltage Low	VDD=5V	-	-	1	V
VDIH	Input Voltage High	VDD=5V	3.5	-	-	V
VDOH	Output Voltage High	VDD=5V , IL=100uA	3.5	-	-	V
ILI	LED Driver Current	VDD=5V , VO=2V , 25℃	16	20		mA
IOP	Operating Current	VDD=5V		320		uA
FOSC	Operating Frequency	VDD=5V		250		KHz

OPERATION OF THE SYSTEM

The operations of 3 LED drivers are controlled by the data packet sent to HL5266A. The data packet includes 8 bits address data, 8 bits brightness PWM data, 5 bits LED1 PWM data, 5 bits LED2 PWM data, and 5 bits LED3 PWM data. HL5266A is set at default state when power on. Device address will be written in when first data packet is transferred into data input pin. When the address data in the following data packets is checked to be same as the address stored in HL5266A, then the brightness data and 3 LED PWM data will be written in HL5266A.

The first bit of each data byte sent into HL5266A is most-significant bit (MSB), and least-significant bit (LSB) is the last bit sent into HL5266A. The data bit in data packet must be modulated by Manchester coding scheme before being sent into HL5266A. A low level signal with a duration of 8µs duration time and follow a high level signal with 24µs duration time represent a logical high data bit. A low level signal with a duration 8µs duration time and follow a high level signal with 8µs duration time represent a logical low data bit. There must have a separation time of at least 100µs high level signal insert in between the end (an 8µs low signal) and begin signal of next data packets. The data signal output from DO pin is the inversion of data signal input to the DI pin.

The performance of brightness of LED driven by HL5266A is dependent on the brightness PWM data and individual LED PWM data. The brightness PWM data controls the pulse width of the current of LED driver. The minimum unit of pulse width is 1/255 full pulse width. A 0 value of brightness data will turn off the current of 3 LED drivers. The LED PWM data controls the pulse width of the current of corresponding LED driver. The maximum PWM level is 31. A 0 value of LED PWM data will turn off the current of LED driver.

The data input and output pins of HL5266A can be cascade connected with the data input and output pins of the other HL5266A to form a daisy chain serial bus system. The address of each HL5266A connected in daisy chain serial bus system must be assigned after power on. The address data in first data packet is assigned to first HL5266A connected in the serial bus. The address data in second data packet is assigned to second HL5266A connected in the serial bus. The address data in third data packet is assigned to third HL5266A connected in the serial bus. The address data in following data packets is assigned one by one to the following HL5266A until the last HL5266A which are connected in the serial bus. The brightness data and LED PWM data will be written in HL5266A if the address data is match with the address data had been assigned to HL5266A.

The address data of number 255 is first common address. Both the brightness PWM data and LED PWM data of data packet with number 255 address data will be written in every HL5266A connected in the serial bus. The address data of number 254 is second common address. Only the brightness PWM data of data packet with number 254 address data will be written in every HL5266A connected in the serial bus. The address data of number 253 is third common address. Both the brightness PWM data and LED PWM data of data packet with number 253 address data will be written in every odd number address of HL5266A connected in the serial bus. The address data of number 252 is forth common address. Both the brightness PWM data and LED PWM data of data packet with number 252 address data will be written in every even number address of HL5266A connected in the serial bus. The address data of number 251 is fifth common address. Only the brightness PWM data of data packet with number 251 address data will be written in every odd number address of HL5266A connected in the serial bus. The address data of number 250 is sixth common address. Only the brightness PWM data of data packet with number 250 address data will be written in every even number address of HL5266A connected in the serial bus.

APPLICATION CIRCUIT I

Single HL5266A Connection

APPLICATION CIRCUIT II

Single Cascaded Serial Connection

APPLICATION CIRCUIT III

Parallel Connected Multi LED String with Cascaded Serial Connection

APPLICATION CIRCUIT IV

Parallel Connected Multi LED String with Common Power Supply Capacitor

APPLICATION CIRCUIT V

Parallel Connected Multi LED String with Separate Power Supply of Master Controller