STLED325 datasheet(42/62 Pages) STMICROELECTRONICS

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KEY matrix and key-input data storage RAM

STLED325

42/62

Doc ID 17576 Rev 1

KEY matrix and key-input data storage RAM

The key matrix is of 8x2 configuration, as shown below:

Figure 15.

KEY matrix and key-input data storage RAM

The data of each key are stored as illustrated below, and are read by the appropriate read

command, starting from the least significant bit.

All the front panel keys can be configured as hot keys using the “configuration mode setting

command”. Alternatively, any number of keys out of 16 keys can be programmed for hot key

functions by using the hot-key setting command.

It is recommended to read the hot key values immediately upon STBY de-assertion. If they

are not read within the guard preset timer value, the hot key data are cleared.

It is recommended to have 10 K

Ω pull down resistors on the KEY1 and KEY2 input pins and

the output SEG/KS pins can see a maximum load of 300pF. This load condition is important

for the key dis-charge cycle time.

Key 1

Key 2

Key 1

Key 2

Key 1

Key 2

Key 1

Key 2

Seg1

KS1

Seg2

KS2

Seg3

KS3

Seg4

KS4

Seg5

KS5

Seg6

KS6

Seg7

KS7

Seg8

KS8

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