Datasheet
Rev. 1.10 22 May 16, 2011 Rev. 1.10 23 May 16, 2011
HT16K33
RAM Mapping 16*8 LED Controller Driver with keyscan
KEY MATRIX CONFIGURATION
An example of key matrix congurations is shown below.
When pressing three or more times is assumed:
A configuration example is shown below. In this configuration, 1 to 39 ON switches can be
recognised.
KS0
KS1
KS2
K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13
=
When pressing twice or more times is assumed:
A configuration example is shown below. In this configuration, 0 to 2 ON switches can be
recognised.
KS0
KS1
KS2
K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13
=
●
In this conguration, pressing three or more times may cause the OFF switches to be determined
as being ON.
For example, if SW2, SW4 are ON and KS0 has been selected (high level) as shown below, SW3,
in which current I1 is running is supposed to be detected to be ON. However, since SW2 and SW4
are ON, current I2 runs thus resulting in SW1 to be recognised as being ON (ghost key).
KS0
KS1
KS2
K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 K13
=
SW1 SW3
SW2
SW4
Select
I1I2