Data Sheet

ManualsBrandsLaird Connectivity ManualsElectronicsLC840PA

LC840PA

Datasheet

https://www.lairdconnect.com

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CONTENTS

1 Overview and Key Features................................................................................................................................................... 5

2 Specification........................................................................................................................................................................... 6

3 Hardware Specifications ...................................................................................................................................................... 10

3.1 Block Diagram and Pin-out......................................................................................................................................... 10

3.2 Pin Definitions............................................................................................................................................................. 12

3.3 Electrical Specifications.............................................................................................................................................. 18

3.4 Programmability.......................................................................................................................................................... 21

3.4.1 LC840PA Default Firmware .................................................................................................................................. 21

3.4.2 BL654PA Special Function Pins in smartBASIC................................................................................................... 21

4 Power Consumption............................................................................................................................................................. 22

5 Functional Description ......................................................................................................................................................... 25

5.1 Power Management.................................................................................................................................................... 25

5.2 LC840PA Power Supply Options................................................................................................................................ 25

5.3 Clocks and Timers...................................................................................................................................................... 28

5.4 Radio Frequency (RF) ................................................................................................................................................ 28

5.5 NFC ............................................................................................................................................................................ 29

5.6 UART Interface........................................................................................................................................................... 30

5.7 USB interface ............................................................................................................................................................. 31

5.8 SPI Bus....................................................................................................................................................................... 31

5.9 I2C Interface............................................................................................................................................................... 32

5.10 General Purpose I/O, ADC, PWM, and FREQ............................................................................................................ 32

5.10.1 GPIO..................................................................................................................................................................... 32

5.10.2 ADC ...................................................................................................................................................................... 32

5.10.3 PWM Signal Output on up to 16 SIO Pins ............................................................................................................ 33

5.10.4 FREQ Signal Output on up to 16 SIO Pins ........................................................................................................... 33

5.11 nRESET pin................................................................................................................................................................ 33

5.12 Two-wire Interface JTAG............................................................................................................................................ 33

5.13 LC840PA Wakeup...................................................................................................................................................... 34

5.14 Temperature Sensor................................................................................................................................................... 35

5.15 Security/Privacy.......................................................................................................................................................... 35

5.15.1 Random Number Generator ................................................................................................................................. 35

5.15.2 AES Encryption/Decryption................................................................................................................................... 35

5.15.3 ARM Cryptocell..................................................................................................................................................... 35

5.15.4 Readback Protection............................................................................................................................................. 35

5.15.5 Elliptic Curve Cryptography .................................................................................................................................. 35

5.16 External 32.768 kHz Crystal ....................................................................................................................................... 36

5.17 453-00087 On-board PCB Antenna Characteristics ................................................................................................... 37

6 Hardware Integration Suggestions....................................................................................................................................... 39