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CH450 Datasheet Preview

CH450 Datasheet

LED drive and keyboard control chip

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The DataSheet of CH450 (the first)
1
LED drive and keyboard control chip CH450
English DataSheet
Version:1C
http://wch.cn
1. Introduction
CH450 is numeric LEDs display drive and keyboard scan control chip. CH450 sets clock surging
circuit internal, drives six bits numeric LEDs or forty-eight LEDs automatically. And it carries out
forty-eight keys keyboard scan. CH450 exchanges data with MCU via two wires serial interface and supplies
power-up reset signal to MCU.
SCL SEG7SEG0
MCU
etc
SDA
INT#
RSTH
CH450 chip
(broken line
are optional)
8×6 matrix
48 keys
keyboard
DIG7DIG2
Six bits
numeric
LEDs or
forty
eight
LEDs
2. Features
Set display current drive layer internal, the segment current is no less than 15mA, the word current is no
less than 80mA.
Dynamically display scan control, directly drive six bits numeric LEDs or forty eight LEDs.
Set forty eight keys keyboard controller internal, basic on 8×6 matrix keyboard scan.
Set pull-down resistor internal on the key pressed station, and set eliminate dithering circuit internal.
Supplies keyboard interrupt active with low-level, supplies key-press release sign bit, to detect key is
pressed or released.
High-speed two wires serial interface, the speed of clock varies from 0 to 4MHz,compatible with two
wires I2C bus, save pins.
Set clock surge circuit internal, the outside supplies clock or surging equipments is no need, stand against
disturbing.
Set clock surging circuit internal, dont need outside to provide clock or connect surge device,
anti-jamming capability is more stronger.
Set power-on reset internal, supplies reset output active with high-level to MCU.
Supplies DIP20 and SOP20 package without lead, compatible with RoHS, the function and pins are
compatible with CH455 in some parts.
Datasheetpdf-htp:/www.DataSheet4U.net/




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CH450 Datasheet Preview

CH450 Datasheet

LED drive and keyboard control chip

No Preview Available !

www.DataSheet.co.kr
The DataSheet of CH450 (the first)
3. Package
2
Package shape Width of plastic Pitch of pin
SOP20 7.62mm 300mil 1.27mm 50mil
DIP20 7.62mm 300mil 2.54mm 100mil
Instruction of package
Small outline package of 20-pin
Dual in-line package of 20-pin
Ordering type
CH450H
CH450K
4. Pins
Pin No.
12
5
10, 11, 13,
14, 15, 16,
17, 18
20, 1, 2,
6, 7, 8
4
3
9
19
Pin Name
VCC
GND
SEG0SEG7
DIG2DIG7
SDA
SCL
RSTH
INT#
Pin Type
POWER
POWER
Tri-station
output input
OUT
With
pull-up
drain open
output input
IN
OUT
With
pull-up
internal
drain open
output
Pin Description
Positive power, the persistent current is no less than 100mA
Public ground, the persistent current is no less than 100mA
Segment drive of numeric LEDs, high-level active,
keyboard scan input, high-level active, with pull-down
resistor
Word drive of numeric LEDs, low-level active, keyboard
scan output, high-level active
Data input and output of two wires serial interface
Data clock of two wires serial interface, with pull-up
resistor internal
Power up reset output, high-level active
Keyboard interrupt output, low-level active with
5. Function description
5.1. General description
The data in this DataSheet has three types. Binary numbers are followed by a B. Hexadecimal
numbers are followed by an H. Numbers without annotations are decimals. X stands for any value.
MCU (DSP, microprocessor and other controller) controls CH450 chip via two wires serial interface.
Numeric LEDs display drive and keyboard scan control are independence in CH450. MCU can start, close
Datasheetpdf-htp:/www.DataSheet4U.net/


Part Number CH450
Description LED drive and keyboard control chip
Maker ETC
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CH450 Datasheet PDF






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