CH455H

WCH
1 CH455 Datasheet http://wch.cn LED Nixie Tube Driver and Keyboard Control Chip CH455 Datasheet Version: 1E http://wch.cn 1. Overview CH455 is a LED Nixie tube display driver and keyboard scan control chip. CH455 has a built-in clock oscillation circuit, which can dynamically drive 4-bit LED Nixie tubes or 32 LEDs and can also scan the keyboard with 28 keys simultaneously. CH455 exchanges d...
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1 CH455 Datasheet http://wch.cn LED Nixie Tube Driver and Keyboard Control Chip CH455 Datasheet Version: 1E http://wch.cn 1. Overview CH455 is a LED Nixie tube display driver and keyboard scan control chip. CH455 has a built-in clock oscillation circuit, which can dynamically drive 4-bit LED Nixie tubes or 32 LEDs and can also scan the keyboard with 28 keys simultaneously. CH455 exchanges data with a MCU through a 2-wire serial interface composed by SCL and SDA. SCL SEG7～SEG0 SDA CH455 MCU, etc. INT# (Dotted line optional) SEG6 ～ 0 7×4 matrix 28-key keyboard DIG3～DIG0 4-bit LED Nixie tube or 32 LEDs 2. Features ● Built-in display current driving stage, segment current not less than 25mA, word current not less than 160mA. ● Dynamic display scanning control, support 8×4 or 7×4, direct drive of 4-bit LED Nixie tubes or 32 LEDs. ● Internal current limiting, provide 8-level brightness control through duty ratio setting. ● Built-in 28-key keyboard controller, based on 7×4 matrix keyboard scanning. ● Built-in pull-down resistor of key status input, built-in jitter suppression circuit. ● Provide active low keyboard interrupt, key release flag bit for query key to be pressed down and released. ● High speed two-wire serial interface, clock speed from 0 to 4MHz, compatible with 2-line I2C bus, saving pins. ● Built-in power on reset, support 2.7V~5V supply voltage. ● Support low-power sleep, save power, can be waked up by key or command operation. ● Built-in clock oscillator circuit, no need to provide external clock or external oscillator components, more anti-interference. ● Provide DIP18, SOP18 and SOP16 lead-free packages, compatible with RoHS, functions and pins compatible with CH450 chip. PDF
Документация на CH455H 

CH455DS1

Дата модификации: 02.01.1970

Размер: 192.1 Кб

12 стр.

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