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Functional Description
Question 1
The HT1632C has two kinds of display types: 32 out bits/8 commons and 24 out bits/16 commons, how are they setup?
Answer
They are setup using software, using the main controller to send commands to the HT1632C. If 100001000xxxB is transmitted or 100001010xxxB instruction code, then the HT1632C will display in 32x8 format. If 100001001xxxB is transmitted or 100001011xxxB instruction code, then the display will be in 24x16 format. (x represents an unknown bit which will not influence the result)
If the two bits, C4 and C3 are 00 and 01 then this indicates that it is working in the NMOS open-drain mode. If 10 and 11 then this indicates that it is working in the PMOS open-drain mode. The order for transmitting instruction codes is as follows:
Question 2
What is the advantage of the HT16K33 compared with other related devices?
Answer
1. With the I2C interface, only two signal lines are required which can reduce wiring costs especially when the main controller and the LED switches are not on the same board.
2. Multiple I2C addresses can be set at the same time, which can also avoid collisions with the other I2C address in the system.
3. Integrated LED driver and key scan functions can automatically execute scanning operations that simplify the system design.
4. With a selectable key scan interrupt signal, the MCU does not need not to check the key status repeatedly which allows it to support more LED drivers by select cyclical operations.
Application Description
Question 1
What are the differences in the instruction format transmission between the LED Driver HT1632C and the LCD Driver HT1621?
Answer
When reading, writing and changing the mode, the method of transmitting instructions with the MCU is different. The HT1632C needs to transmit a 7-bit address and the HT1621 needs to transmit a 6-bit address.
Question 2
Are the HT1632C and HT16K33 suitable for the common-cathode or common-anode LED matrix design?
Answer
Both common-cathode and common-anode types can be used for the LED matrix if the row/com requirements of the LED matrix is within the supported range of the IC.
The RAM data format of the HT1632C is for common anode type while the HT16K33 is for common-cathode type. Note that both formats are supported with proper conversion.
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