HT16K33 datasheet(16/47 Pages) HOLTEK

16 / 47 page

Rev. 1.10

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Rev. 1.10

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HT16K33

RAM Mapping 16*8 LED Controller Driver with keyscan

Display Memory – RAM Structure

● The display RAM is a static 16 x 8 -bits RAM which stores the LED data. Logic “1” in the RAM

bit-map indicates the “on” state of the corresponding LED Row; similarly, a logic 0 indicates the

“off” state.

● There is a one-to-one correspondence between the RAM addresses and the Row outputs, and

between the individual bits of a RAM word and the column outputs. The following shows the

mapping from the RAM to the LED pattern:

COM0

ROW0

ROW7 ROW8

ROW15

CO�0

00H

01H

CO�1

0�H

03H

CO��

04H

05H

CO�3

0�H

07H

CO�4

08H

09H

CO�5

0AH

0BH

CO��

0CH

0DH

CO�7

0EH

0FH

● I2C bus display data transfer format

Data byte of I2C

ROW

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LED drive mode waveforms and scanning is as follows:

● The HT16K33 allows use of 1/9 duty mode and the combined ROW/INT pin is set to a ROW

driver output as shown:

ROW3/K1~ROW15/K13

1040 μs

32 μs

1024 μs

CO�0

(AD)

CO�1

(KS0)

CO��

(KS1)

CO�3

(KS�)

CO�4

CO�5

CO��

CO�7

16 μs

1 Frame=1056us*9=9.504ms

32 μs

Hi-z

VDD

VSS

VDD

VSS

VDD

VSS

VDD

VSS

VDD

VSS

VDD

VSS

VDD

VSS

VDD

VSS

VDD

VSS

LOW

Hi-z

LOW

Hi-z

LOW

LED Display period

Key scan

period

ROW0/A�~ROW�/A0

Hi-z

HT16K33 Datasheet(PDF) 16 Page - Holtek Semiconductor Inc

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