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HT1632 32´8 & 24´16 LED Driver
Features
· Operating voltage: 2.4V~5.5V · Multiple LED display - 32 out bits/8 commons and · Serial MCU interface - CS, RD, WR, DATA · Data mode & command mode instruction · Cascading function for extended applications

24 out bits/16 commons
· Integrated display RAM - select 32 out bits &

(up to 5 HT1632s possible)
· Selectable NMOS open drain output driver and

8commons for 64´4 display RAM, or select 24 outbits & 16 commons for 96´4 display RAM
· 16-level PWM brightness control · Integrated 256kHz RC oscillator

PMOS open drain output driver for commons
· 52-pin QFP package

Applications
· Industrial control indicator · Digital clock, thermometer, counter, voltmeter · Instrumentation readouts · Other consumer application · LED Displays

GeneralDescription
The HT1632 is a memory mapping LED display controller/driver, which can select a number of out bits and commons. These are 32 out bits & 8 commons and 24 out bits & 16 commons. The device supports 16-gradation LEDs for each out line using PWM control with software instructions. A serial interface is conveniently provided for the command mode and data mode. Only three or four lines are requiredfor the interface between the host controller and the HT1632. The display can be extended by cascading the HT1632 for wider applications.

Block Diagram
V D D V S S D is p la y R A M

C O M 0 C S R D W R D A T A C o n a n T im C ir c tro l d in g u it C O M 7 O U T B IT 0 L E D D r iv e r O U T B IT 2 3 O U T B IT 2 4 /C O M 1 5 O U T B IT 3 1 /C O M 8 L E D _ V S S

O S C S Y N C

T im in g G en e ra to r

P W M

C o n tro l

Rev. 1.00

1

October 2, 2007

HT1632
Pin Assignment
O U O U O U L E O U O U O U O U O U O U O U O U L E T B T B T B D _ T B T B T B T B T B T B T B T B D _ IT 2 IT 2 IT 2 V S IT 1 IT 1 IT 1 IT 1 IT 1 IT 1 IT 1 IT 1 V S S S
5 2 5 1 5 0 4 9 4 8 4 7 4 6 4 5 4 4 4 3 4 2 4 1 4 0 1 2 3

2 0 1 2

3

4

5

6

7

8

9

O U T O U T O U O U O U O U O U O U L E D O U O U O UO U

B IT 1 B IT 1 T B IT T B IT T B IT T B IT T B IT T B IT _ V S T B IT T B IT T B IT T B IT S

1 0 9 8 7
5 4

3 9 3 8 3 7 3 6 3 5

6 5
7 6

H T 1 6 3 2
8 9 1 0

4 3 2 1 0

5 2 Q F P -A

1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6

3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7

O U O U O U O U O U L E O U O U O U O U C O C O C O

T B IT T B IT T B IT T B IT T B IT D _ V S T B IT T B IT TB IT T B IT M 7 M 6 M 5

2 3 2 4 2 5 2 6 2 7 S 2 8 2 9 3 0 3 1

/C /C /C /C /C /C /C /C

O M O M O M O M O M O M O M O M

1 5 1 4 1 3 1 2 1 1 1 0 9 8

C O M C O M C O M C O M C O M V D D S Y N C C S R D W R D A T A O S C V S S 0 1 2 3 4

Pin Description
Pad Name OUTBIT0~OUTBIT23 OUTBIT24/COM15~ OUTBIT31/COM8 COM0~COM7 SYNC I/O O O O I/O Description Line drivers. These pins drive the LEDs. DriveLED output or Common output Common outputs Cascade synchronization input and output If the system clock is is sourced from an external clock source, the external clock source should be connected to this pad. If the on-chip RC oscillator is selected, this pad can be connected to a high or low level. If the cascade mode is selected, this pad is the driver clock signal. Serial data input or output withpull-high resistor WRITE clock input with pull-high resistor Data on the DATA lines are latched into the HT1632 on the rising edge of the WR signal. READ clock input with pull-high resistor. The HT1632 RAM data is clocked out on the falling edge of the RD signal. The clocked out data will appear on the DATA line. The host controller can use the next rising edge to latch the clocked out data. Chipselect input with pull-high resistor When the CS line is high, the data and command read from or written to the HT1632 is disabled, and the serial interface circuit is also reset. If CS is low, the data and command transmission between the host controller and the HT1632 are all enabled. Negative power supply for driver circuit, ground. Negative power supply for logic circuit, ground. Positive...