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PDF HT16C21 Data sheet ( Hoja de datos )
| Número de pieza | HT16C21 | |
| Descripción | LCD Driver Controller | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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HT16C21
RAM Mapping 20*4 / 16*8 LCD Driver Controller
Feature
●● Operating voltage: 2.4 ~ 5.5V
●● Internal 32kHz RC oscillator
●● Bias: 1/3 or 1/4; Duty: 1/4 or 1/8
●● Internal LCD bias generation with voltage-
follower buffers
●● I2C interface
●● Two selectable LCD frame frequencies: 80Hz or
160Hz
●● Up to 16 x 8 bits RAM for display data storage
●● Display patterns:
––20 x 4 patterns: 20 segments and 4 commons
––16 x 8 patterns: 16 segments and 8 commons
●● Versatile blinking modes
●● R/W address auto increment
●● Internal 16-step voltage adjustment to adjust LCD
operating voltage
●● Low power consumption
●● Provides VLCD pin to adjust LCD operating voltage
●● Manufactured in silicon gate CMOS process
●● Package Type: 20/24/28 SOP, 16 NSOP and Chip.
Applications
●● Electronic meter
●● Water meter
●● Gas meter
●● Heat energy meter
●● Household appliance
●● Games
●● Telephone
●● Consumer electronics
General Description
The HT16C21 device is a memory mapping and
multi-function LCD controller/driver. The display
segments of the device are 80 patterns (20 segments
and 4 commons) or 128 patterns (16 segments and 8
commons). The software configuration feature of the
HT16C21 device makes it suitable for multiple LCD
applications including LCD modules and display
subsystems. The HT16C21 device communicates with
most microprocessors/microcontrollers via a two-line
bidirectional I2C interface.
Rev. 1.00
1 November 22, 2011
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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HT16C21
Pin Description
SDA
SCL
VDD
VSS
Pin Name
VLCD
COM0~COM3
COM4/SEG0~COM7/SEG3
SEG4~SEG19
Type
Description
I/O Serial data input/output for I2C interface
I Serial clock input for I2C interface
— Positive power supply.
— Negative power supply, ground.
●●One external resistor is connected between the VLCD pin and the VDD
pin to determine the bias voltage for the package with a VLCD pin.
Internal voltage adjustment function is disabled.
—
●●Internal voltage adjustment function can be used to adjust the VLCD
voltage. If the VLCD pin is used as voltage detection pin, an external
power supply should not be applied to the VLCD pin.
●●An external MCU can detect the voltage of the VLCD pin and program the
internal voltage adjustment for the packages with a VLCD pin.
O LCD common outputs.
O LCD common/segment multiplexed driver outputs
O LCD segment outputs.
Approximate Internal Connections
SCL, SDA (for schmit Trigger type)
COM0~COM7; SEG0~SEG19
VDD
Vselect-on
Vselect-off
VSS
Absolute Maximum Ratings
Supply voltage .......................................................................................................................VSS−0.3V to VSS+6.5V
Input voltage .........................................................................................................................VSS−0.3V to VDD+0.3V
Storage temperature ........................................................................................................................-55°C to +150°C
Operating temperature ......................................................................................................................-40°C to +85°C
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings"
may cause substantial damage to the device. Functional operation of this device at other conditions beyond
those listed in the specification is not implied and prolonged exposure to extreme conditions may affect
device reliability.
Rev. 1.00
5 November 22, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
HT16C21
LCD Drive Mode Waveforms
●● When the LCD drive mode is selected as 1/4 duty and 1/3 bias, the waveform and LCD display is shown as
follows:
VLVCLDCD
CCOOMM0 0
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
CCOOMM1 1
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
CCOOMM2 2
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
CCOOMM3 3
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
SESGEGn n
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
SESGEGn+n1+1
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
SESGEGn+n2+2
VLVCLDC-DV- oVpo/p3/3
VLVCLDC-D2- V2oVpo/p3/3
VSVSSS
VLVCLDCD
SESGEGn+n3+3VVLVCLVLCDCLD-CD-2D-V-V2oVoVppoo//pp33//33
VSVSSS
tLCD
S(tSoa(tntoae)nt1e)1
LCLCDDsesgemgmenetnt
S(tSoa(tftoafe)ft2fe)2
Note: tLCD = 1/fLCD
Waveforms for 1/4 duty drive mode with 1/3 bias (VOP = VLCD-VSS)
Rev. 1.00
11
November 22, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HT16C21.PDF ] | |
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