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CH450 Schematic ( PDF Datasheet ) - ETC

Teilenummer CH450
Beschreibung LED drive and keyboard control chip
Hersteller ETC
Logo ETC Logo 




Gesamt 9 Seiten
CH450 Datasheet, Funktion
www.DataSheet.co.kr
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/






CH450 Datasheet, Funktion
www.DataSheet.co.kr
The DataSheet of CH450 (the first)
6
7. Parameter
7.1. Absolute maximum rating (Stresses above those listed can cause permanent damage to the device.
Exposure to maximum rated conditions can affect device operation and reliability.)
Name
Parameter note
Min. Max. Units
TA
Ambient operating
temperature
VCC=5V
VCC=3.3V
-30 85
-40 70
TS
Storage temperature
-55 125
VCC Voltage source (VCC connects to power, GND to ground) -0.5 6.5 V
VIO
The voltage of input or output pin
-0.5 VCC+0.5 V
IMdig
Sequential driven current of signal DIG pin
0 120 mA
IMseg
Sequential driven current of signal SEG
0 25 mA
IMall
The total of all SEG pins sequential driven current
0 130 mA
7.2. Electrical parameter (test conditions: TA=25,VCC=5V)
Name
Parameter note
Min.
VCC
Source voltage
3.3
ICC Source current
0.2
ICCs
Static current (SCL and SDA 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
Low-level input voltage of DIG
-0.5
VIHseg
High-level input voltage of DIG
1.8
VOLdig DIG pin is low-level output voltage (-80mA)
VOHdig
DIG pin is high-level output voltage (8mA)
4.5
VOLseg SEG pin is low-level output voltage (-18mA)
VOHseg SEG pin is high-level output voltage (15mA)
4.5
VOL
Low-level output voltage of other pins (-4mA)
VOH
High-level output voltage of other pins (4mA)
4.5
IDN1
Input pull-down current of SEG
IUP1
Input pull-up current of SCL pin
IUP2
Input pull-up current of SDA pin
IUP3
Output pull-up current of INT# pin
VR Default restrict voltage when power-up reset
2.3
Typical
5
80
0.5
-50
200
300
230
2.6
Max.
5.5
150
1
0.8
VCC+0.5
0.5
VCC+0.5
0.8
0.5
0.5
-90
300
400
350
2.9
Units
V
mA
mA
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
0.5 1
4 mS
TKS Interval of keyboard scan, acknowledge time of key-press
16
mS
Datasheet pdf - http://www.DataSheet4U.net/

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