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WCH CH451S

Manufacturer
WCHAsian Brands
MPN
CH451S
LCSC Part #
C46001
Packaging
SOP-28-300mil
Customer #
Key Attributes
Digital tube driver and keyboard control chip
DatasheetWCH CH451S
Every Order Guarantee
100% Authentic · 30-Day Return or Replacement
In-Stock: 13
13 In stock, ships now
Minimum: 1Multiple: 1Sales Unit: Piece
Add to BOM List
QtyUnit PriceTotal Amount
1+$ 2.319$ 2.32
10+$ 1.9486$ 19.49
25+$ 1.7175$ 42.94
100+$ 1.4799$ 147.99
500+$ 1.3734$ 686.70
1,000+$ 1.3258$ 1325.80
Standard Packaging25/Full Tube
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/Display Drivers
ManufacturerWCH
PackagingSOP-28-300mil
Voltage - Supply3V~5V
Configuration8 Segment x 8 Digit
Operating Temperature-40℃~+85℃
Pd - Power Dissipation-
Clock Frequency10MHz
Interface4-Wire Serial Interface
FeaturesBCD input latch function;Internal reset function;Cascadable function;PWM dimming;Built-in display RAM
Quiescent Current (Iq)-
Segment Drive Current25mA
Digit Drive Current150mA
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Introduction

AI Translation

CH451 is a multifunctional peripheral chip integrating LED display driving, keyboard scanning control, and μP supervisory functions. With a built-in RC oscillator, it can dynamically drive 8-digit 7-segment displays or 64 discrete LEDs, supporting BCD decoding, blinking, and shift functions. It also provides 64-key keyboard scanning, exchanges data with MCUs via a cascadable serial interface, and offers supervisory functions including power-on reset and watchdog timer.

Features

AI Translation
  • Display Driver:
    • Built-in high-current drive stage; segment current ≥25mA, digit current ≥150mA.
    • Dynamic display scan control, directly drives 8-digit seven-segment displays or 64 LEDs.
    • Selectable no-decode mode (segment-to-data bit direct mapping) or BCD decode mode for seven-segment displays.
    • Digit data left shift, right shift, left rotate, and right rotate for seven-segment displays.
    • Independent blinking control for each digit.
    • Arbitrary segment addressing; independent on/off control of individual LEDs or individual segments of each digit.
    • 16-level brightness control via duty cycle setting.
    • Segment current limit adjustment; eliminates the need for current-limiting resistors.
    • Scan limit control; supports 1 to 8 digits, allocating scan time only to active digits.
  • Keyboard Controller:
    • Built-in 64-key keyboard controller based on 8×8 matrix keyboard scanning.
    • Built-in pull-down resistors for key state input and integrated debounce circuit.
    • Keyboard interrupt with active-low output.
    • Key release flag for polling key press and release events.
  • Other:
    • High-speed 4-wire serial interface with multi-chip cascade support; clock speed from 0 to 10MHz.
    • DIN and DCLK signal lines on the serial interface are shareable with other interface circuits, reducing pin count.
    • Fully integrated clock oscillator circuit; no external crystal or RC oscillator required.
    • Built-in power-on reset and watchdog (Watch-Dog); provides active-high and active-low reset outputs.
    • Low-power sleep mode support for power saving; wake-up via key press or command.
    • Supply voltage: 3V to 5V.
    • Available in SOP28 and DIP24S lead-free packages, RoHS compliant.
    • Pin and function largely compatible with the CH452 chip in 4-wire interface mode.