BLE vs Bluetooth Classic?

Bluetooth Classic is optimized for continuous streaming (audio, file transfer) at higher power. BLE is designed for intermittent, small data transfers at ultra-low power. BLE uses 40 channels (2 MHz each) vs Classic's 79 channels (1 MHz). BLE can operate for years on a CR2032 coin cell while Classic typically needs daily charging. They share the 2.4 GHz ISM band but are incompatible protocols.

BLE 4.x: typically 30-50 m indoors, up to 100 m LOS. BLE 5.0 Coded PHY (S=8): up to 400 m LOS by trading data rate for coding gain (+12 dB link budget improvement). Actual range depends on TX power (typically 0 to +8 dBm), antenna gain, and environment. BLE 5.0 also doubled the maximum TX power to +20 dBm.

BLE power consumption?

Peak TX current: 5-15 mA for 1-2 ms per event. Sleep current: 1-5 microamps. A sensor transmitting once per second at 0 dBm on a 230 mAh CR2032 can last 2-5 years. Key to low power: short TX bursts, long sleep intervals, and efficient connection parameters (interval, slave latency).

Wireless Protocols

BLE

/bee-el-ee/ (Bluetooth Low Energy)

BLE (Bluetooth Low Energy) is a short-range 2.4 GHz wireless protocol designed for ultra-low power IoT applications. Introduced in Bluetooth 4.0 (2010), BLE uses 40 channels with 2 MHz spacing, GFSK modulation, and frequency hopping to deliver intermittent data transfers while consuming only microamps in sleep mode. A sensor on a CR2032 coin cell can operate for 2-5 years. BLE 5.0+ added Coded PHY for 4× range, 2M PHY for 2× speed, and extended advertising for richer beacon payloads.

Category: Wireless Protocols

Band: 2.4 GHz ISM

Range: 30-400 m

Understanding BLE

BLE's power efficiency comes from short TX bursts (1-2 ms), long sleep intervals, and minimal protocol overhead. The advertising mechanism lets devices broadcast small data packets (beacons) without establishing a connection. Connected mode uses GATT (Generic Attribute Profile) for structured data exchange with configurable connection intervals from 7.5 ms to 4 seconds.

BLE 5.0 introduced three PHY options: 1M (legacy, 1 Mbps), 2M (2 Mbps for lower latency), and Coded (125/500 kbps for extended range via FEC coding gain). BLE 5.1 added direction finding (AoA/AoD) for cm-level indoor positioning.

BLE Link Budget

TX power: 0 to +20 dBm (BLE 5.0)
Receiver sensitivity: −97 dBm (1M), −103 dBm (Coded S=8)
Link budget: P_TX − Sensitivity
At +0 dBm, 1M PHY: 97 dB link budget
At +0 dBm, Coded S=8: 103 dB (+6 dB = ~2× range)

BLE Version Comparison

Version	PHY	Data Rate	Range	Key Feature
4.0	1M	1 Mbps	~50 m	BLE introduction
4.2	1M	1 Mbps	~50 m	LE Data Length Extension
5.0	1M/2M/Coded	0.125-2 Mbps	Up to 400 m	Long range, 2M PHY
5.1	1M/2M/Coded	0.125-2 Mbps	Up to 400 m	Direction finding
5.3	1M/2M/Coded	0.125-2 Mbps	Up to 400 m	Channel classification

Common Questions

Frequently Asked Questions

BLE vs Classic?

Classic: continuous streaming (audio), higher power. BLE: intermittent small data, ultra-low power. Different protocols sharing 2.4 GHz. BLE lasts years on coin cell vs daily charging.

BLE range?

1M PHY: 30-50 m indoors. Coded PHY (S=8): up to 400 m LOS with +12 dB coding gain. BLE 5.0 also allows up to +20 dBm TX power.

Power consumption?

Peak TX: 5-15 mA for 1-2 ms. Sleep: 1-5 μA. Sensor transmitting 1/s on CR2032: 2-5 year battery life.

Related Terms

← BLAST BLE 2M PHY →

IoT Wireless

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