HT1635A Datasheet, PDF (1/29 Pages) Holtek Semiconductor Inc – 44×8 LED Driver

HT1635A/HT1635B
44×8 LED Driver
Features
• Operating voltage: 2.4V~5.5V
• LED display -- 44 row and 8 Columns
• 88×4 bit RAM display data storage
• 16-level PWM brightness control
• Integrated256kHz RC oscillator
• I²C-bus or 4-wire serial interface
• Data mode & command mode instructions
• Cascade function for extend applications
• Selectable NMOS open drain output driver and
PMOS open drain output driver for COM lines
• 64-pin LQFP package
Applications
• Industrial control displays
• Digital clocks, thermometers, counters, electronic
meters
• Instrumentation readouts
• Other consumer applications
• LED displays
General Description
The HT1635A/HT1635B is a memory mapping LED
display controller/driver. The maximum display
capacity of the device is 352 patterns composed of
44 rows and 8 commons. The device can generate 16
LED illumination levels using software controlled
PWM circuitry. A serial interface is provided to allow
the device to receive instructions for its command
mode and data mode. Only two or four lines are
required to interface the device to a host controller.
The display capacity can be easily extended by
cascading the devices thus expanding its application
possibilities. The device is compatible with most
microcontrollers offering easy interfacing via its two
serial interfaces, an I2C bus or a 4-wire serial bus.
Selection Table
Part Number
HT1635A
HT1635B
Interface
4-wire serial bus
I²C serial bus
Block Diagram
CSB/A0
RDB/A1
WRB/SCL
DATA/SDA
Control &
Timing Circuit
VDD
VSS
OSC
SYNC
IFS
Timing
Generator
Display RAM
2
VDD
ROW0
LED
Driver
ROW43
COM7
COM0
2
VSS
PWM Control
Rev. 1.20
1
August 26, 2015