Specifications

https://www.lairdconnect.com/wireless-
modules/bluetooth-modules/bluetooth-5-
modules/bl654-series-bluetooth-module-nfc
3
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1 Overview and Key Features ................................................................................................................................................... 4
2 Specification ........................................................................................................................................................................... 5
3 Hardware Specifications ........................................................................................................................................................ 9
3.1 Block Diagram and Pin-out ........................................................................................................................................... 9
3.2 Pin Definitions ............................................................................................................................................................. 10
3.3 Electrical Specifications .............................................................................................................................................. 16
3.4 Programmability .......................................................................................................................................................... 19
4 Power Consumption ............................................................................................................................................................. 20
4.1 Power Consumption ................................................................................................................................................... 20
4.2 Peripheral Block Current Consumption ....................................................................................................................... 22
5 Functional Description ......................................................................................................................................................... 23
5.1 Power Management .................................................................................................................................................... 23
5.2 BL654 Power Supply Options ..................................................................................................................................... 23
5.3 Clocks and Timers ...................................................................................................................................................... 25
5.4 Radio Frequency (RF) ................................................................................................................................................ 26
5.5 NFC ............................................................................................................................................................................ 26
5.6 UART Interface ........................................................................................................................................................... 27
5.7 USB interface ............................................................................................................................................................. 28
5.8 SPI Bus ....................................................................................................................................................................... 29
5.9 I2C Interface ............................................................................................................................................................... 29
5.10 General Purpose I/O, ADC, PWM and FREQ ............................................................................................................. 29
5.11 nRESET pin ................................................................................................................................................................ 30
5.12 Two-Wire Interface JTAG ........................................................................................................................................... 31
5.13 BL654 Wakeup ........................................................................................................................................................... 32
5.14 Low Power Modes ...................................................................................................................................................... 32
5.15 Temperature Sensor ................................................................................................................................................... 32
5.16 Security/Privacy .......................................................................................................................................................... 32
5.16.1 Random Number Generator ................................................................................................................................. 32
5.16.2 AES Encryption/Decryption ................................................................................................................................... 32
5.16.3 ARM Cryptocell ..................................................................................................................................................... 32
5.16.4 Readback Protection ............................................................................................................................................. 33
5.16.5 Elliptic Curve Cryptography .................................................................................................................................. 33
5.17 Optional External 32.768 kHz crystal .......................................................................................................................... 33
5.18 451-00001 On-board PCB Antenna Characteristics ................................................................................................... 35
5.19 451-00003 USB BLE 5.1 Dongle Mechanical Details ................................................................................................. 36
6 Hardware Integration Suggestions ....................................................................................................................................... 38
6.1 Circuit ......................................................................................................................................................................... 38
6.2 PCB Layout on Host PCB - General ........................................................................................................................... 39
6.3 PCB Layout on Host PCB for the 451-00001 .............................................................................................................. 40
6.4 External Antenna Integration with the 451-00002 ....................................................................................................... 42
7 Mechanical Details ............................................................................................................................................................... 43
8 Application Note for Surface Mount Modules ....................................................................................................................... 45
8.1 Introduction ................................................................................................................................................................. 45
8.2 Shipping ...................................................................................................................................................................... 45
8.3 Reflow Parameters ..................................................................................................................................................... 48
9 Regulatory............................................................................................................................................................................ 50
10 Ordering Information ............................................................................................................................................................ 50
11 Bluetooth SIG Qualification .................................................................................................................................................. 50
12 Additional Assistance ........................................................................................................................................................... 53