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CH455 데이터시트 PDF




ETC에서 제조한 전자 부품 CH455은 전자 산업 및 응용 분야에서
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부품번호 CH455 기능
기능 LED drive and keyboard control chip
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CH455 데이터시트, 핀배열, 회로
English DataSheet of CH455
1
LED drive and keyboard control chip CH455
English DataSheet
Version:1C
http://wch.cn
1. Introduction
CH455 is LED display drive and keyboard scan control chip. It sets clock surge circuit
internally to drive four bits number LED or thirty two LEDs dynamically. And at the same time it
can scan 28-key. CH455 exchanges data with MCU via two wires serial interface of SCL and
SDA..
MCU
etc
SCL
SDA
INT#
CH455
(broken line
is optional)
SEG7SEG0
SEG6
7×4 matrix
28 keys
board
DIG3DIG0
4 bits
LED
Or
32
LEDs
2. Features
Set display current drive layer internally, the current of segment is no less than 25mA, the
current of word is no less than 160mA.
Display scan control dynamically, support 8×4 or 7×4, directly drive four bits number LED or
thirty two LEDs.
Internal limit current, set eight level light control via space percentage.
Set 28-key keyboard control, based on 7×4 matrix scan..
Set pull-down resistor internal while key-press, glitter removable.
Supply keyboard interrupt active with low-level, and supply key-press release token to check
the key is pressed or release.
High speed two wires serial interface, the speed of clock varies from 0 to 4MHz, compatible
with I2C bus, save pins.
Set turn on power to reset, 2.7V~5V power.
Support low exhaust sleep mode to save energy, awoke via press key or command.
Set clock surge circuit internally, the external clock or surge equipment is not necessary, resister
to be disturbed.
Supply DIP18, SOP18 and SOP16 package without lead, compatible with RoHS, the function
and pins are part compatible with CH450 .




CH455 pdf, 반도체, 판매, 대치품
English DataSheet of CH455
4
5.3. Keyboard scan
The function of keyboard scan supports 28-key keyboard which is 7×4 matrix. During the
keyboard scan period, DIG3 to DIG0 are used to column scan output, the pins of SEG6 to SEG0
are all have pull-down resister internal, used to row scan input.
CH455 insert the keyboard scan regularly during display drive scan. During keyboard scan,
DIG3 to DIG0 output high level in turns according DIG0 to DIG3, the other pins output low level;
the output of SEG6~SEG0 are forbidden, when there is no key pressed, SEG6~SEG0 are pulled to
low level; when there is a key pressed, such as the key connect DIG1 to SEG4 is pressed, DIG1
output high level and SEG4 has checked high level; in order to avoid the environment, CH455
will scan twice, and once the two result is the same, the key press is efficient. If CH455 has
checked the efficient key-press, take a record of the key-press code, and generate the keyboard
interrupt which active with low level via INT#, at the same time, MCU can read the key-press
code via serial interface; before checking the efficient key-press, CH455 will not generate any
keyboard interrupt. CH455 doesnt support the assembled key-press; it means that, two keys or
more keys can not be pressed at the same time. CH455 supports combination key of SEG1 and
SEG0 for the same DIG, the combination key has the priority. In additional, if two keys or more
keys are pressed, the key with lower code has the priority. For example, the two keys which
connection of DIG1 with SEG1, and connection of DIG1 and SEG0, are combination key.
The key-press code supplied by CH455 has 8 bits, the bit-7 is always 0 and bit-2 is 1, bit1 to
bit 0 is column scan code, bit5 to bit3 is row scan code, bit 6 is state code (press key is 1, release
key is 0). For example, the key connects DIG1 to SEG4 is pressed, the key-press code is
01100101B or 65H, when the key is released, the key-press code is 00100101B or 25H (maybe is
other code, but the value is lower than 40H). The column scan code is 01B responding to DIG1,
the row scan code is 100B responding to SEG4. MCU can read the key-press code at any time, in
generally, after checking the efficient key-press, generating keyboard interrupt, then read the
key-press code. At this time, the bit6 is always 1. MCU can read the key-press code via check
mode to know when the key is released, till the bit6 is 0.
The following table is key-press address of DIG3~DIG0 and SEG6~SEG0, also is numeric
LED segment bit and LED array address. The key-press code is 8-bit, the bit-6 is always 1 when
press key. When key is pressed, the actual key-press code is the following address adds 40H, it
means that the key-press code is between 44H and 77H.
address
DIG3 DIG2 DIG1 DIG0
SEG0
07H 06H 05H 04H
SEG1
0FH 0EH 0DH 0CH
SEG2
17H 16H 15H 14H
SEG3
1FH 1EH 1DH 1CH
SEG4
27H 26H 25H 24H
SEG5
2FH 2EH 2DH 2CH

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CH455 전자부품, 판매, 대치품
English DataSheet of CH455
7
TS
VCC
VIO
IMdig
IMseg
IMall
Storage temperature
-55 125
Voltage source (VCC connects to power, GND to ground) -0.5
6.5
The voltage of input or output pin
-0.5 VCC+0.5
Sequential driven current of signal DIG pin
0 200
Sequential driven current of signal SEG
0 40
The total of all SEG pins sequential driven current 0 130
V
V
mA
mA
mA
7.2. Electrical parameter (test conditions: TA=25,VCC=5V)
Name
Parameter note
Min.
VCC
Source voltage
2.7
ICC Source current 0.2
ICCs
Static current (SCL, SDA and INT# are
high-level)
ICCsIp
Sleep current (SCL, SDA and INT# are
high-level)
VIL
SCL and SDA are low-level input voltage
-0.5
VIH SCL and SDA are high-level input voltage 2.0
VILseg
SEG low-level input voltage
-0.5
VIHseg
SEG high-level input voltage
1.8
VOLdigx DIG pin is low-level output voltage (-200mA)
VOLdig DIG pin is low-level output voltage (-100mA)
VOHdig
DIG pin is high-level output voltge (5mA)
4.5
VOLsegx SEG pin is low-level output voltage (-40mA)
VOLseg SEG pin is low-level output voltage (-20mA)
VOHseg SEG pin is high-level output voltage (20mA)
4.5
VOL
Other pins low-level output voltage (-4mA)
VOH
Other pins high-level output voltage (4mA)
4.5
IDN1
Input pull-down current of SEG pin
-30
IUP1
Input pull-up current of SCL pin
10
IUP2
Input pull-up current of SDA pin
150
IUP3
Input pull-up current of INT# pin
500
VR
Default restrict voltage when power-up reset
2.2
Typical
5
80
0.05
Max.
5.3
150
0.15
Units
V
mA
mA
0.006
-50
200
300
2000
2.4
0.02
0.8
VCC+0.5
0.5
VCC+0.5
1.2
0.8
1.0
0.5
0.5
-400
300
500
5000
2.6
mA
V
V
V
V
V
V
V
V
V
V
V
V
uA
uA
uA
uA
V
7.3. Internal sequence parameter (test conditions: TA=25,VCC=5V)
(note: the sequence parameter in this table is multiple of inner clock cycle, the frequency of inner
clock will reduce while source power falls.)
Name
Parameter note
Min. Typical Max. Units
TPR Reset time generated by power-up detection
10 25 60 mS
TDP Display scan cycle
4 8 20 mS
TKS Key-board scan interval, key-press acknowledge time 20 40 80 mS
7.4. Interface sequence parameter (test conditions: TA=25,VCC=5V, consult the
following image)

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부품번호상세설명 및 기능제조사
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LED drive and keyboard control chip

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