embedded-processors-controllers

EFM8BB21F16G

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

01 — Overview

This datasheet covers the EFM8BB21F16G, a member of Silicon Labs' 8-bit Busy Bee microcontroller family. The document details the device's architecture, features, and applications for space-constrained embedded systems like motor control and sensor interfaces. Key parameters include a 50 MHz CIP-51 core, up to 16 KB flash memory, and 2304 bytes of RAM. It offers a 12-bit ADC, two analog comparators, five 16-bit timers, and multiple serial interfaces supporting speeds up to 12 Mbps for SPI and 400 kbps for I2C. The MCU operates on a single 2.2 to 3.6 V supply and is available in QFN and QSOP packages.

02 — Key specifications

Datasheet parameters

ParameterMinTypMaxConditions
quiescent current — 9.1 mA 9.7 mA FSYSCLK = 49 MHz (HFOSC1)2
output voltage 3.1 V 3.3 V 3.6 V Output Current = 1 to 100 mA
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 — 85 °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 — 21 —
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 EFM8BB21F16G

EFM8BB21F16A-C-QFN20 1.9× higher operating temperature, 1.8× lower output voltage, similar quiescent current
EFM8BB51F16G-C-QFN20 7.1× lower output current, 2.8× lower output voltage, 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, 1.4× higher supply voltage range
GD32E230C4T6 4.0× higher core size, 3.0× lower output voltage low, 1.8× higher ram size
GD32E230K4T6 4.0× higher core size, 3.0× lower output voltage low, 1.8× higher ram size
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 of the EFM8BB21F16G?

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) of the EFM8BB21F16G?

The common-mode rejection ratio (CMRR) is 70 dB.

What is the core size of the EFM8BB21F16G?

The core size is 8 bit.

What is the maximum CPU speed of the EFM8BB21F16G?

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.

How many I/O pins does the EFM8BB21F16G have?

The EFM8BB21F16G has 21 I/O pins.

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