HT16K33 datasheet(29/47 Pages) HOLTEK

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Rev. 1.10

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HT16K33

RAM Mapping 16*8 LED Controller Driver with keyscan

Acknowledge

● Each bytes includes eight bits is followed by a single acknowledge bit. This acknowledge bit is a

low level put on the bus by the receiver, the master generates an extra acknowledge related clock

pulse.

● A slave receiver which is addressed must generate an acknowledge (ACK) after the reception of

each byte.

● The device that acknowledge must pull down the SDA line during the acknowledge clock pulse

so that it remains stable low during the high period of this clock pulse.

● A master receiver must signal an end of data to the slave by generating a not-acknowledge (NACK)

bit on the last byte that has been clocked out of the slave. In this case, the master receiver must

leave the data line high during the 9th pulse to not acknowledge. The master will generate a STOP

or repeated START condition.

clk pulse for

acknowledgement

DATA OUTPUT

BY TRANSMITER

DATA OUTPUT

BY RECEIVER

SCL FROM

MASTER

acknowledge

not acknowledge

START

condition

Slave Addressing

● The HT16K33 device requires an 8-bit slave address word following a start condition to enable

the device for a write operation. The device address words consist of a mandatory one, zero

sequence for the first four most significant bits (refer to the diagram showing the slave Address).

This is common to all LED devices.

● The slave address input circuit is shown below. A2~A0 are set to “0”, when A2~A0 are floating.

A2~A0 are to “1”, when A2~A0 are connected to an AD pin with a diode and resister.

● The slave address set is loaded into the HT16K33 at every frame.

ROW�/A0

ROW1/A1

ROW0/A�

A�

HT1�K33

CO�0/AD

39KΩ*3

● The slave address byte is the first byte received following the START condition from the master

device. The first seven bits of the first byte make up the slave address. The eighth bit defines

whether a read or write operation is to be performed. When the R/W bit are “1”, then a read

operation is selected. A “0” selects a write operation.

HT16K33 Datasheet(PDF) 29 Page - Holtek Semiconductor Inc

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