embedded processors controllers

CH551

Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the CH551 does

The CH552x family comprises 8-bit enhanced E8051 microcontrollers featuring a 24 MHz clock, 16 KB ROM, and 1 KB xRAM. Models include the CH552 with USB, ADC, and touch detection, and the simplified CH551. These devices operate on 3.3 V or 5 V supplies, support USB 2.0 full-speed 12 Mbps, and offer 14 interrupt sources. Engineers typically use them for embedded control, USB peripherals, and industrial automation requiring high instruction density and integrated peripherals like PWM, SPI, and dual UARTs.

Next step
Start building with CH551 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
01 — Key specifications

Datasheet parameters

Datasheet parameters for CH551
ParameterMinTypMaxConditionsSource
supply voltage range 3 V — 5 V WCH datasheet, p. 14 — 7.1 外部电源输入
operating temperature (abs max) -40 °C — 85 °C ta; 18.1 绝对最大值(临界或者超过绝对最大值将可能导致芯片工作不正常甚至损坏) WCH datasheet, p. 49 — 18.1 绝对最大值(临界或者超过绝对最大值将可能导致芯片工作不正常甚至损坏)
clock frequency — 24 MHz — WCH datasheet, p. 1
cpu speed — 24 MHz — WCH datasheet, p. 50 — 18、参数
program memory size — 9.77 KB — WCH datasheet, p. 1 — 1、概述
ram size — 768 B — WCH datasheet, p. 1 — 1、概述
io count — 17 — WCH datasheet, p. 2
core size — 8 bit — WCH datasheet, p. 1
02 — Alternatives

Closest matches to CH551

ATmega168A 1.6× higher program memory size, 1.3× higher ram size, 1.2× lower clock frequency
ATmega8A 1.5× lower clock frequency, 1.5× lower cpu speed, 1.3× higher ram size
CH552G 1.7× higher ram size, 1.6× higher program memory size, similar clock frequency
MS51FB9AE-T 1.6× higher program memory size, 1.4× higher operating temperature, 1.3× higher ram size
ATmega48PA 2.5× lower program memory size, 1.5× lower ram size, 1.2× lower clock frequency
CC1110F16RHHR 2.6× higher ram size, 1.6× higher program memory size, 1.4× lower supply voltage range
MSP430G2553IPW28R 12.0× lower clock frequency, 2.0× higher core size, 1.6× higher program memory size
PIC16LF1824 3.0× lower ram size, 1.9× higher operating temperature, 1.5× lower supply voltage range
03 — FAQ

Frequently asked questions

What is the maximum clock frequency of the CH551?

The maximum clock frequency is 24 MHz.

What is the core size of the CH551?

The core size is 8 bit.

What is the CPU speed of the CH551?

The CPU speed is 24 MHz.

How many I/O pins does the CH551 have?

The CH551 has 17 I/O pins.

What is the maximum operating temperature (ta) for the CH551?

The maximum operating temperature (ta) is 85 °C; exceeding absolute maximum ratings may cause the chip to malfunction or be damaged.

What is the program memory size of the CH551?

The program memory size is 9.77 KB.

What is the RAM size of the CH551?

The RAM size is 768 B.

What is the supply voltage range for the CH551?

The supply voltage range is 5 V.

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