HT1632C(2015) Просмотр технического описания (PDF) - Holtek Semiconductor

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HT1632C
(Rev.:2015)

32×8 & 24×16 LED Driver

Holtek Semiconductor 

HT1632C

System Oscillator

The HT1632C system clock is used to generate the

time base clock frequency, LED-driving clock. The

clock may be sourced from an on-chip RC oscillator

(256kHz), or an external clock using the S/W setting.

The configuration of the system oscillator is as shown.

After the SYS DIS command is executed, the system

clock will stop and the LED duty cycle generator will

turn off. This command is, however, available only

for the on-chip RC oscillator. Once the system clock

stops, the LED display will become blank, and the

time base will also lose its function. The LED OFF

command is used to turn the LED duty cycle generator

off. After the LED duty cycle generator switches off

by issuing the LED OFF command, using the SYS

DIS command reduces power consumption, serving

as a system power down command. But if the external

clock source is chosen as the system clock, using the

SYS DIS command can neither turn the oscillator

off nor execute the power down mode. The crystal

oscillator option can be applied to connect an external

frequency source to the OSC pin. In this case, the

system fails to enter the power down mode, similar to

the case in the external clock source operation. At the

initial system power on, the HT1632C is in the SYS

DIS state.

O SC

E x te r n a l C lo c k S o u r c e

O n - c h ip R C O s c illa to r

256kH z

S y s te m

C lo c k

System Oscillator Configuration

LED Driver

The HT1632C has a 256 (32×8) and 384 (24×16)

pattern LED driver. It can be configured in a 32×8 or

24×16 pattern and common pad N-MOS open drain

output or P-MOS open drain output LED driver

using the S/W configuration. This feature makes the

HT1632C suitable for multiple LED applications. The

LED-driving clock is derived from the system clock.

The driving clock frequency is always 256kHz, an on-

chip RC oscillator frequency, or an external frequency.

The LED corresponding commands are summarized

in the table. The bold form of 1 0 0, namely 1 0

0, indicates the command mode ID. If successive

commands have been issued, the command mode ID

except for the first command will be omitted. The LED

OFF command turns the LED display off by disabling

the LED duty cycle generator. The LED ON command,

on the other hand, turns the LED display on by enabling

the LED duty cycle generator.

Name

LED OFF

LED ON

Commons Option

Command

Code

10000000010X

10000000011X

1000010abXXX

Function

Turn off LED outputs

Turn on LED outputs

ab=00: N-MOS open drain output and 8 common option

ab=01: N-MOS open drain output and 16 common option

ab=10: P-MOS open drain output and 8 common option

ab=11: P-MOS open drain output and 16 common option

Cascade Operation

For the cascade operation, the first IC is set to master mode and its SYNC and OSC pins are set to output pins. The

second IC is set to slave mode and its SYNC and OSC pins are set to input pins which are connected to the the

master IC. Please refer to the ″Cascade control flow chart″ for detail settings.

Blinker

The HT1632C has display blinking capabilities. The blink function generates all LED blinking. The blink rates is 0.25s

LED on and 0.25s LED off for one blinking period . This blinking function can be effectively performed by setting

the BLINK ON or BLINK OFF command.

LE D

T u rn O n

0 .2 5 s

T u rn O ff

0 .2 5 s

Rev. 1.60

B lin k O n

Example of Waveform for Blinker

7

B lin k O ff

August 19, 2015

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