embedded-processors-controllers

EFM8BB21F16A

Full part number: EFM8BB21F16A-C-QFN20

Key datasheet specifications and the closest alternatives, ranked by parametric similarity and grounded in the manufacturer datasheet.

01 — Overview

This Silicon Labs datasheet covers the EFM8BB2 Busy Bee family of 8-bit microcontrollers, listing eight specific part numbers across QFN and QSOP packages. The document serves as a comprehensive technical reference for designers seeking space-efficient MCUs with integrated analog and communication peripherals. Key performance parameters include a pipelined CIP-51 core running up to 50 MHz, 16 KB of reprogrammable flash memory, and 2304 bytes of RAM. It features a 12-bit ADC, two low-current comparators, five 16-bit timers, and multiple serial interfaces supporting speeds up to 12 Mbps for SPI and 3 Mbaud for UARTs. Devices operate on a single supply of 2.2 to 3.6 V (or 5.25 V with regulator) and are available in industrial or automotive temperature grades.

02 — Key specifications

Datasheet parameters

ParameterMinTypMaxConditions
quiescent current — 9.4 mA 10.1 mA FSYSCLK = 49 MHz (HFOSC1)2
output voltage 1.78 V 1.85 V 1.92 V
output current — — 100 mA
supply voltage range 2.2 V — 3.6 V
input offset voltage -10 mV 0 V 10 mV TA = 25 °C
cmrr — 70 dB —
operating temperature -40 °C — 125 °C
clock frequency 0 Hz — 50 MHz
psrr — 70 dB —
dropout voltage — — 800 mV Output Current = 100 mA
cpu speed — 50 MHz —
program memory size — 16 kB —
ram size — 2.3 kB —
io count — 16 —
adc resolution — 12 bit —
core size — 8 bit —
program erase cycles 20 kcycle 100 kcycle —
output voltage low — — 600 mV IOL = 13.5 mA, VDD≥ 3.0 V
03 — Alternatives

Closest matches to EFM8BB21F16A

EFM8BB21F16G 1.9× lower operating temperature, 1.8× higher output voltage, similar quiescent current
EFM8BB51F16G-C-QFN20 7.1× lower output current, 1.9× lower operating temperature, 1.8× lower ram size
EFM8BB10F2A-A-QFN20 9.0× lower ram size, 8.0× lower program memory size, 2.4× lower output voltage low
CH32V003F4U6 4.0× higher core size, 2.0× higher clock frequency, 1.9× lower operating temperature
GD32E230C4T6 4.0× higher core size, 3.0× lower output voltage low, 1.9× lower operating temperature
GD32E230K4T6 4.0× higher core size, 3.0× lower output voltage low, 1.9× lower operating temperature
MSP430FR2310 7.8× lower program memory size, 6.2× lower cpu speed, 5.3× lower supply voltage range
MSPM0G3505SDGS28 6.9× higher ram size, 4.0× higher core size, 2.5× lower clock frequency
04 — FAQ

Frequently asked questions

What is the ADC resolution?

The ADC resolution is 12 bit.

What is the maximum clock frequency?

The maximum clock frequency is 50 MHz.

What is the common-mode rejection ratio (CMRR) for the EFM8BB21F16A-C-QFN20?

The CMRR is 70 dB.

What is the core size of the EFM8BB21F16A-C-QFN20?

The core size is 8 bit.

What is the maximum CPU speed for the EFM8BB21F16A-C-QFN20?

The maximum CPU speed is 50 MHz.

What is the dropout voltage when the output current is 100 mA?

The dropout voltage is 800 mV at an output current of 100 mA.

What is the input offset voltage at TA = 25 °C?

The input offset voltage is 0 V at TA = 25 °C.

What is the I/O count for the EFM8BB21F16A-C-QFN20?

The I/O count is 16.

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