HT16L21 datasheet(3/36 Pages) HOLTEK

3 / 36 page

Rev. 1.00

November 16, 2011

HT16L21

Pin Assignment

12 13 14 15 16 17 18 19 20 21 22

44 43 42 41 40 39 38 37 36 35 34

CSB

CLK/SCL

HT16L21

44 LQFP

DIO/SDA

RSTB

VDD

VLCD

COM0

COM1

COM2

COM3

SEG0

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

Pin Description

Pin Name

Type

Description

SDA/DIO

I/O

Serial data input/output pin

● Serial data (SDA) input/output for 2-wire I2C interface is an NMOS open drain

structure.

● Serial data (DIO) input/output for 3-wire SPI interface is a CMOS input/output

structure.

SCL/CLK

Serial clock input pin

● Serial data (SCL) is clock input for 2-wire I2C interface.

● Serial data (CLK) is clock input for 3-wire SPI interface

CSB

Chip select pin

This pin is available for 3-wire SPI interface and not used for I2C interface.

IFS

Communication interface select pin

This pin is used to select the communication interface. When this pin is

connected to VDD, the device communicates with MCU or microprocessors

via a 2-wire I2C interface. When this pin is connected to VSS, the device

communicates with MCU or microprocessors using a 3-wire SPI interface.

COM0~COM3

O LCD common outputs

SEG0~SEG23

O LCD segment outputs

SEG24/LED7~SEG31/LED0

O LCD segment/LED multiplexed driver outputs

RSTB

Reset input pin

1. This pin is used to initialize all the internal registers and the commands pin.

2. If use internal power on reset circuit only, the RSTB pin must be connected

to VDD.

VDD

— Positive power supply

VSS

— Negative power supply, ground.

VLCD

— LCD power supply pin

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