HT16D35A Datasheet, PDF (67/71 Pages) Holtek Semiconductor Inc – RAM Mapping 28×8 Constant Current LED Driver

HT16D35A/HT16D35B
Example 2: COM with transistor buffer for I²C serial bus
LED Matrix
LED Matrix
LED_VDD
COM0 ~ COM7
PNP×8
ROW0 ~ ROW27
LED_VDD
COM0 ~ COM7
PNP×8
ROW0 ~ ROW27
R×8
R×8
VDD
0.1μF
500Ω
COM0 ~ COM7
VDD
R_EXT
VSS
A0
HT16D35B
(Master)
LED_VDD
ROW0 ~ ROW27
LED_VDD
0.1μF
LED_VSS
SCL SDA OSC SYNC
R×8
R×8
VDD
0.1μF
COM0 ~ COM7
VDD
LED_VDD
ROW0 ~ ROW27
LED_VDD
0.1μF
500Ω
R_EXT
VSS
A0
HT16D35B
(Slave)
LED_VSS
SCL SDA OSC SYNC
VDD
VDD
4.7kΩ
4.7kΩ
0.1μF
VDD
VSS
MCU
I²C Serial bus
Note: 1. Cascading can also be implemented using software. Users must set the master in the master mode and the
slave in the slave mode using commands. The CSB pin must be connected to the MCU individually for
independent read and write.
2. The R resistor values depend upon the LED power consumption.
Rev. 1.00
67
January 12, 2017