HT16D35A Datasheet, PDF (1/71 Pages) Holtek Semiconductor Inc – RAM Mapping 28×8 Constant Current LED Driver

HT16D35A/HT16D35B
RAM Mapping 28×8 Constant Current LED Driver
Features
• Operating voltage: 2.7V~5.5V
• LED display: 28 rows and 8 commons
• LED data RAM1: 28×8×6 bits=1344 bits for Gray
mode
• LED data RAM2: 28×8×6 bits=1344 bits for FADE
mode
• LED data RAM3: 28×8 bits=224 bits for Binary
mode or Matrix masking
• LED data RAM4: 28×8 bits=224 bits for Universal
Segment function
• LED data RAM5: 8×8 bits=64 bits for Universal
COM function
• Integrated 4.92MHz RC oscillator
• 64-level global brightness scale
• Binary scale mode or Gray scale mode
• Global blinking or fade function
• Universal COM and Universal Segment function
• Automatic scroll function: up/down/left/right
• Continuous lighting function for ROW24~ROW27
• External current reference control using external
resistor
• Supports row port max. 45mA sink constant current
• 8-level current reference adjustment
• Over temperature protection circuit
• I²C-bus or SPI 3-wire interface
• Cascade function for extend applications
• Package Type: 48-pin LQFP-EP
Applications
• Industrial control displays
• Mobile phones
• Traffic signboards and information displays
• Digital clocks, thermometers, counters, electronic
meters
• Instrumentation readouts
• Other consumer applications
• LED displays
General Description
The HT16D35A/HT16D35B are high accuracy
constant current and memory mapping LED display
controller/drivers. The maximum display capacity
of the devices is 224 patterns composed of 28 rows
and 8 commons. The devices can generate a 64 step
Gray Scale (PWM data) using software controlled
PWM circuitry and 64 LED illumination levels using
software controlled PWM circuitry. The devices
provide constant current outputs control using external
resistors for each row output terminal. A serial
interface is provided to allow the devices to receive
instructions for its command mode and data mode.
Only three lines are required for device interfacing to
a host controller. The display capacity can be easily
extended by cascading the devices thus expanding its
application possibilities. The devices are compatible
with most microcontrollers offering easy interfacing
via their two serial interfaces, an I²C interface or a
SPI 3-wire serial interface.
Selection Table
Part Number
HT16D35A
HT16D35B
Interface
3-wire SPI
I²C
Rev. 1.00
1
January 12, 2017