Using the HT16C24 in Mobile Phone Panel Applications · Task7 Read frist call Task6 enyer Read frist call Standby 3S Task7 enyer Network signal scanning ClockDisp Task_run_time

Using the HT16C24 in Mobile Phone Panel Applications


D/N：AN0287E

Introduction The HT16C24 is an LCD driver device. It has multiple display modes (Max：72×4, 68×8 or

60×16). This application uses the HT68F30 as the master MCU to control an LCD display

and uses an HT16C24 driving function for a 64×4 LCD. The purpose of the application is

to allow users to grasp the characteristics and applications of the HT16C24 more clearly.

Function Description

LCD Panel Display Function

Rate display

Figure 1 LCD Panel

Figure 1 shows the Mobile Phone LCD Panel. It is mainly composed of function

instructions T1~T18, the rate display, the time and timing display, the call charges display,

the date or telephone number display etc.

The example is driving a Mobile Phone LCD Panel to realise functions such as phone

standby, dial, answer, query etc using the HT16C24 driver chip.

Date or telephone number display

Time and timing display Call

charges

1


H/W Functional Block Diagram

System Block Diagram

SegX68ComX4

Figure 2 System Block Diagram

System Block Diagram Description

As shown in Figure 2, the whole system consists of both a Top Board and a Bottom Board.

The two parts implement data transfer using I2C communication and the Bottom Board

provides the 4.7V DC power supply for the Top Board.

Top Board

Driver chip HT16C24

LCD Panel

Bottom Board

Controls MCU HT68F30

AC to DC 4.7V regulator circuit

ICP interface for users to download code

2


Application Circuit

The circuit diagram consists of a Top Board and a Bottom Board, as shown in Figure 3

and Figure 4 respectively.

Figure 3 Circuit Diagram Top Board

Figure 4 Circuit Diagram Bottom Board

3


H/W Operating Principles

Power Supply Circuit

Figure 5 Power Supply Circuit

Figure 5 shows the power supply circuit. The 220V / 50Hz AC supply is transformed into

4.7V DC via the fuse F1, capactive dropper C2, a half-wave rectified circuit and a zener

diode D3, which supplies power for the master HT68F30 MCU and the HT16C24 LCD

driver.

MCU Control Circuit

Figure 6 MCU Control Circuit

Figure 6 shows the MCU control circuit. The master MCU is a HT68F30, which uses PA3

and PA4 to simulate the I2C master mode, transmit data to the HT16C24, so as to control

the LCD display screen.

4


Display Circuit

Figure 7 Display Circuit

Figure 7 shows the display circuit which uses a HT16C24 to drive a three-phase

electrical meter LCD panel. Set HT16C24 operation mode to the following:

72seg x 4com、1/4 duty、1/3 bias、Blinking Off and Display On etc.

5


S/W Flowchart

The main program flowchart is as follows.

Main enter

MCU Initial

HT16C24 Initial

Task1

Task2

Task3

Task4

Task5

Task6

Task7

Task1 enyer

LCD display on

ClockDisp

Task_run_time<3?

Task_run_time=0

LCD flash 1HZ

ClockDisp

Task_run_time<3?

Task2

N

N

Y

Y

Last missed calls

ClockDisp

Task_run_time<3?

Task3

N

Y

Task_run_time=0

Task2 enyer

Call time and bill

ClockDisp

Task_run_time<0X30?

Task4

N

Y

Read Phone

Task3 enyer

Standby 3S

Task_run_time=0

Call time and bill

ClockDisp

Task_run_time<0X30?

Task5

N

Y

Read Phone

Task4 enyer

Standby 3S

Task_run_time=0

Read second miss call

Read thrid miss call

Task6

Read frist miss call

Task5 enyer

Standby 3S

Read second call

Read thrid call

Task7

Read frist call

Task6 enyer

Read frist call

Standby 3S

Task7 enyer

Network signal scanning

ClockDisp

Task_run_time<6?

Task_run_time=0

Low Battery

ClockDisp

Task_run_time<6?

Task1

N

N

Y

Y

Task_run_time=0

1.Main 2.Task1 2.Task2 2.Task3

2.Task4 2.Task5 2.Task6 2.Task7

Figure 8 Program Flowchart Diagram

Main Flowchart Diagram Description

The main program is written using an ordered structure. It completes each task one by

one and finally returns to perform the initial task. An inquiry method is used to query the

Time Base Interrupt to confirm the time for the time control. A query on the Time Base is

implemented in the ClockDisp subfunction to control the clock displays. The execution

time of each task is controlled by the parameter task_run_time.

6


Display Steps Description

Step0 : Boot display stage

After booting, the screen lights up for 3 seconds, flashes 3 times and enters the next

stage.

Step1 : Standby display stage

The Time T13 displays the local time 11:49:59, the T7 battery capacity grid, the T10 network provider, the Signal T1~T5, T5 > T4 > T3 > T4 > T5 will cycle back and forth,

the Number T14 display ( displays the latest missed call), the Missed Call Number T12

initial value is set to 3, all the rest are off. After displaying for 3 seconds, enter the next

stage. (In the standby screen, if it does not display the last missed call, then it will

display May 25, 2011).

Step2 : Call reporting

Call the number (18615201314), the Number T14 is alight and begins to display the

called number from the last number, and the number moves left gradually. In a

dial-up process, Click OK to Send the Number and T6 flashes. After all the numbers

have displayed, T6 flashes for 5 seconds, then the phone connects.

After the phone connects, T6 remains alight, and displays the rate of the current call

number T16~T18, 17~23 and P5 (the charge rate changes correspondingly

according to different talk times) and begins to record the talk time (T13 shows, 00 :

00 : 00 which starts counting from 30 seconds) and the call charges (T15 is alight

and the charges will increase correspondingly. In the first 12 seconds, the rate is

0.35 yuan per 12 seconds. After 12 seconds, the rate is 0.25 yuan per 4

seconds.The place where the number is displayed is changed to show the talk time.

When the call has ended, T6 will be off, the talk time and the charges will remain

alight for 5 seconds and finally return to the standby stage (Time state, but will not

display the latest missed call) (the final status is: the Network is China Unicom, T10

is off, T11 is alight) the grid number of the signal strength must be changed (T5 > T4

> T3 > T4 > T5 to scan back and forth), after displaying standby for 3 seconds,

enter the next stage.

Step3 : Answer the call stage

Receive a call (13850591557), the Number T14 will alight, the digital display 1~14

will display the called number directly, T9 starts to flash to answer the call. After

flashing for 5 times ,the display remains alight which means a successful call

answer.

After the phone connects, T9 remains alight and begins to display the rate, and

records the talk time (00 : 00 : 00 which starts counting from 30 seconds) and the

charges (T15 is alight, and the charges will increase correspondingly, because of

the different network. In the first 12 seconds, the charge rate is 0.25 yuan per 12

seconds. After 12 seconds, the charge rate is 0.10 yuan per 4 seconds.The place

where the number is displayed will change to show the talk time.

When the call has ended, T9 will be off, the talk time and charges will remain alight

for 5 seconds and finally return to the standby stage (the Network choice is for China

Mobile at this state), T10 is alight, T11 is off and the grid number of the signal

strength T5 > T4 > T3 > T4 > T5 will scan back and forth. After displaying standby

for 3 seconds, enter the next stage.

7


Step4 : missed calls query

T8 is alight – this means that it has begun to query the numbers of the three groups

of missed calls.

When T8 is alight, the Missed calls (T12 alight) means the total number of missed

calls. After each missed call display T14 and the digital display for 5 seconds, T13

displays the corresponding missed call time (Each has a check, the missed call

numbers minus 1 which will ultimately be zero), jump to the standby mode

automatically, the grid number of the signal strength T5 > T4 > T3 > T4 > T5 must

scan back and forth. After displaying standby for 3 seconds, enter the next stage.

The Time continues to count (the missed number displays a zero).

Step5 : Charge query

Charge query for dialled numbers: the Missed Call (T12) is off, the digital display 15, 16

shows the serial number of the dialled numbers (at least three groups of numbers), T14

displays the dialled numbers, T13 is alight and displays the total talk time, T15 is alight

and displays the total call charge. Each group of telephone numbers is displayed for 5

seconds. After displaying standby for 3 seconds, enter the next stage. The Time

continues to count (the missed numbers display as 3 > 2 > 1 > 3).

Step6 : Battery and signal stage

The signal strength changes from strong to weak, then from weak to strong. When the

signal strength is less than two grids, the signal flag (T1) flashes. When the signal

strength is zero, the Network will be shown (T10 and T11 are off), After displaying

standby for 6 seconds, enter the next stage.

When the battery is low, T7 flashes, providing a charge reminder. The Number, the

rate, the charges, the missed calls etc are off. But the Time will still be displayed.

Enter the low power state. After displaying standby for 6 seconds, enter the next

stage (STEP0).

PCB Layout

Top Board Front PCB

Figure 9 Top Board Front PCB

8


Top Board Back PCB

Figure 10 Top Board Back PCB

Bottom Board PCB

Figure 11 Bottom Board PCB

9


Actual Picture

Figure 12 Actual Picture

10


BOM

HT16C24 Mobile Phone Panel LCD Display Controller(Components List)

Type Model Package Number

HT68F30 16NSOP 1 IC

HT16C24 QFP 1

Safety Capacitor(X2) 0.1uF/275VAC 1

CBB Capacitor(220V) 0.47uF/630V 1

CBB Capacitor(110V) 1uF/630V 1

Electrolytic Capacitor 470uF/16V 2

Ceramics Capacitor 104 4

Capacitor

Ceramics Capacitor 103 1

Varistor 471KD10 1

Power Resistor 300/2W 1

Power Resistor 300K/2W 1

Color Ring Resistance 100K/0.25W 1

Color Ring Resistance 4.7K/0.25W 2

Resistor

Color Ring Resistance 300/0.25W 1

Diode IN4007 2

Diode IN4148 1 Diode

Voltage Regulator Diode IN5337B 1

Magnetic Bead 2 Pin 2

Fuse 2 Pin 1

Reset Button 4 Pin 1

Power Socket 2 Pin 1

Power Cord 220V/110V 1

Row Seat 4 Pin 1

Row Needle 4 Pin 2

LCD Panel Mobile Phone 1

Hexagonal Isolated Column Plastic Material 8

Other

Shell Plastic Material 1

11


Test Report

ESD

Project name HT16C24 Mobile Phone Panel LCD Display Controller

IC Number HT16C24

IC Version B107K0606G1

Model Name HT16C24 Mobile Phone Panel LCD Display Controller

Model Version V0.0

Test Instrument : Transient 2000

Relative Humidity : 45 ~ 75 % RH

Ambient Temperature : about 20°C

Atmospheric Pressure : 68 ~ 106 Kpa ( 680 ~ 1060 mbar)

Test Time : 13/05-2011

Test Items : Simulated Final Test

Power Supply Voltage AC 220 V / MCU voltage : DC 4.5V

Power Frequency 50Hz

AIR (Air discharge) pattern CONTACT (Contact discharge) pattern

ESD voltage (+) ESD voltage (-) ESD voltage (+) ESD voltage (-)

15KV -15KV +15KV -15KV

Test method : the panel will be installed with the circuit board to access power and conduct a complete test.

In Air (Air discharge) pattern : use the electrostatic gun to carry out an air discharge for the panel.

In Contact (Contact discharge) pattern : use the electrostatic gun to carry out a contact discharge for the panel.

Test results : No crashes or defective operation.

12


EFT


IC Number HT16C24


Model Name LCD Display Controller

Model Version V0.0

Test instrument : KeyTek EMC Pro ( EFT/B NOISE SIMULATOR )

Relative humidity : 45 ~ 75 % RH

Ambient temperature : about 25°C

Atmospheric pressure : 86 ~ 106 Kpa ( 860 ~ 1060 mbar)

Test time : □ dynamic 1 Min ■ dynamic 3 Min

Test items : ■ PCB MODULE Test □ Final Test

Power supply voltage AC220V / MCU voltage : DC 4.5V

Power frequency 50Hz

PARAMETER Parckle Fre. : 5KHz / Burst Dur. : 15ms / Rep. : 300ms

Phase L N L+N

Polarity + - + - + -

DemoBoard 4000V 4000V 4000V 4000V 4000V 4000V

Impulse


IC Number HT16C24


Model name LCD Display Controller Model Version V 0.0

Power supply voltage AC220V / MCU voltage : DC 4.5V Power frequency 50Hz

Test instrument : NOISEKEN INS 420A ( IMPULSE NOISE SIMULATOR )

Relative humidity : 45 ~ 75 % RH Ambient temperature : about 24°C

Atmospheric pressure : 68 ~ 106 Kpa ( 680 ~ 1060 mbar)

Test time : □ static 1 Min ■ static 3 Min □ dynamic 1 Min □ dynamic 3 Min

Test items : ■ PCB MODULE Test □ Final Test ■ load test □ No-load test

Reset loop

Pulse width 50ns 1000ns

Phase R(L1) S(L2) R(L1) S(L2)

Polarity + - + - + - + -

90 degrees 2KV 2KV 2KV 2KV 2KV 2KV 2KV 2KV

Angle 270 degrees

2KV 2KV 2KV 2KV 2KV 2KV 2KV 2KV

Experimental Result PASS PASS PASS PASS PASS PASS PASS PASS

Note: The measurement results are different but fixtures are the same.

13


14

Accessory Source Code File

Code.zip

PCB Figure File

Pcb.zip

Demo Board Specification

HT16C24 Mobile Phone Panel LCD Display Controller Specification-V00.zip

Demo Board Display Flowchart

HT16C24 Mobile Phone Panel LCD Display Flowchart.zip

Documents

Using the HT16C24 in Mobile Phone Panel Applications · Task7 Read frist call Task6 enyer Read frist call Standby 3S Task7 enyer Network signal scanning ClockDisp Task_run_time