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CH455 Datasheet Preview

CH455 Datasheet

LED drive and keyboard control chip

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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 .




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CH455 Datasheet Preview

CH455 Datasheet

LED drive and keyboard control chip

No Preview Available !

English DataSheet of CH455
3. Package
2
Package
DIP18
SOP18
SOP16
Width of plastic
7.62mm 300mil
7.62mm 300mil
3.9mm 150mil
Pitch of pin
2.54mm 100mil
1.27mm 50mil
1.27mm 50mil
Instruction of package
Dual in-line package of 18-pin
Small outline package of 18-pin
Small outline package of 16-pin
Ordering
CH455K
CH455H
CH455G
4. Pins
Pin No.
DIP18/SOP18
11
4
9,10
12,13
14,15
16
17
1,5
6,7
3
2
18
SOP16
14
8
12,13
15,16
1,2
3
4
5,9
10,11
7
6
No
Pin Name
VCC
GND
SEG0
SEG6
SEG7
DIG0
DIG3
SDA
SCL
INT#
Type
POWER
POWER
Tri-state
Output
Input
Output
Output
With
pull-up
resister
Drain-open
output
input
input
With
Description
Positive power, the persistent current is no less
than 150mA
Public ground, the persistent current is no less
than 150mA
Segment driver of LEDs, active with high
level,
Keyboard scan input, active with high level,
with pull-down resistor
Radix point segment output of LED, active
with high level,
Key-board interrupt output in 7-segment
mode, active with low level
Word diver of LED, active with low level,
Key-board scan output, active with high level
Data input and output of 2-wire serial
interface,
With pull-up resister
Data clock of 2-wire serial interface,
With pull-up resister
Key-board interrupt output, active with


Part Number CH455
Description LED drive and keyboard control chip
Maker ETC
Total Page 12 Pages
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