Datasheet nRF51822 - 40

link to page 40 link to page 51 link to page 48 nRF51822 Product Specification v3.1
8.1.2 16 MHz crystal oscillator (16M XOSC) Test Symbol Description Note Min. Typ. Max. Units level
fNOM,X16M Crystal frequency. 16 MHz N/A fTOL,X16M Frequency tolerance.1 ±502 ppm N/A Frequency tolerance, Bluetooth low fTOL,X16M,BLE energy applications.1 ±402 ppm N/A C0 ≤ 7 pF, CL,MAX ≤ 16 pF 50 100 Ω N/A RS,X16M Equivalent series resistance. C0 ≤ 5 pF, CL,MAX ≤ 12 pF 75 150 Ω N/A C0 ≤ 3 pF, C 100 200 Ω N/A L,MAX ≤ 12 pF PD,X16M Drive level. 100 μW N/A Input capacitance on XC1 and XC2 Cpin 4 pF 1 pads. Run current for 16 MHz crystal IX16M SMD 2520 CL = 8 pF 4703 μA 1 oscillator. Run current for the 16 MHz crystal IX16M,1M oscillator when used only for a Timer SMD 2520 CL = 8pF 2503 μA 1 at 1 MHz or less. Standby current for 16 MHz crystal ISTBY,X16M SMD 2520 CL = 8 pF 25 μA 1 oscillator.4 Startup current for 16 MHz crystal ISTART,XOSC 1.1 mA 3 oscillator. Startup time for 16 MHz crystal tSTART,XOSC SMD 2520 CL = 8 pF 400 5005 μs 2 oscillator. Total startup time tSTART,X16M SMD 2520 CL = 8 pF 800 μs 1 (tSTART,XOSC + debounce period).6 1. The Frequency tolerance relates to the amount of time the radio can be in transmit mode. See
Table 38
on page 51. 2. Includes initial tolerance of the crystal, drift over temperature, aging, and frequency pulling due to incorrect load capac- itance. 3. This number includes the current used by the automated power and clock management system. 4. Standby current is the current drawn by the oscillator when there are no resources requesting the 16M, meaning there is no clock management active (see
Table 33
on page 48). This value will depend on type of crystal. 5. Crystals with other specification than SMD 2520 may have much longer startup times. 6. This is the time from when the crystal oscillator is powered up until its output becomes available to the system. It includes both the crystal startup time and the debounce period.
Table 22
16 MHz crystal oscillator Page 40 Document Outline 1 Introduction 1.1 Required reading 1.2 Writing conventions 2 Product overview 2.1 Block diagram 2.2 Pin assignments and functions 2.2.1 Pin assignment QFN48 2.2.2 CDAB WLCSP ball assignment and functions 2.2.3 CEAA and CFAC WLCSP ball assignment and functions 3 System blocks 3.1 CPU 3.2 Memory 3.2.1 Code organization 3.2.2 RAM organization 3.3 Memory Protection Unit (MPU) 3.4 Power management (POWER) 3.4.1 Power supply 3.4.2 Power management 3.5 Programmable Peripheral Interconnect (PPI) 3.6 Clock management (CLOCK) 3.6.1 16/32 MHz crystal oscillator 3.6.2 32.768 kHz crystal oscillator 3.6.3 32.768 kHz RC oscillator 3.6.4 Synthesized 32.768 kHz clock 3.7 GPIO 3.8 Debugger support 4 Peripheral blocks 4.1 2.4 GHz radio (RADIO) 4.2 Timer/counters (TIMER) 4.3 Real Time Counter (RTC) 4.4 AES Electronic Codebook Mode Encryption (ECB) 4.5 AES CCM Mode Encryption (CCM) 4.6 Accelerated Address Resolver (AAR) 4.7 Random Number Generator (RNG) 4.8 Watchdog Timer (WDT) 4.9 Temperature sensor (TEMP) 4.10 Serial Peripheral Interface (SPI/SPIS) 4.11 Two-wire interface (TWI) 4.12 Universal Asynchronous Receiver/Transmitter (UART) 4.13 Quadrature Decoder (QDEC) 4.14 Analog to Digital Converter (ADC) 4.15 GPIO Task Event blocks (GPIOTE) 4.16 Low Power Comparator (LPCOMP) 5 Instance table 6 Absolute maximum ratings 7 Operating conditions 7.1 WLCSP light sensitivity 8 Electrical specifications 8.1 Clock sources 8.1.1 16/32 MHz crystal startup 8.1.2 16 MHz crystal oscillator (16M XOSC) 8.1.3 32 MHz crystal oscillator (32M XOSC) 8.1.4 16 MHz RC oscillator (16M RCOSC) 8.1.5 32.768 kHz crystal oscillator (32k XOSC) 8.1.6 32.768 kHz RC oscillator (32k RCOSC) 8.1.7 32.768 kHz Synthesized oscillator (32k SYNT) 8.2 Power management 8.3 Block resource requirements 8.4 CPU 8.5 Radio transceiver 8.5.1 General radio characteristics 8.5.2 Radio current consumption with DC/DC disabled 8.5.3 Radio current consumption with DC/DC enabled 8.5.4 Transmitter specifications 8.5.5 Receiver specifications 8.5.6 Radio timing parameters 8.5.7 Antenna matching network requirements 8.6 Received Signal Strength Indicator (RSSI) specifications 8.7 Universal Asynchronous Receiver/Transmitter (UART) specifications 8.8 Serial Peripheral Interface Slave (SPIS) specifications 8.9 Serial Peripheral Interface (SPI) Master specifications 8.10 I2C compatible Two Wire Interface (TWI) specifications 8.11 GPIO Tasks and Events (GPIOTE) specifications 8.12 Analog to Digital Converter (ADC) specifications 8.13 Timer (TIMER) specifications 8.14 Real Time Counter (RTC) 8.15 Temperature sensor (TEMP) 8.16 Random Number Generator (RNG) specifications 8.17 AES Electronic Codebook Mode Encryption (ECB) specifications 8.18 AES CCM Mode Encryption (CCM) specifications 8.19 Accelerated Address Resolver (AAR) specifications 8.20 Watchdog Timer (WDT) specifications 8.21 Quadrature Decoder (QDEC) specifications 8.22 Non-Volatile Memory Controller (NVMC) specifications 8.23 General Purpose I/O (GPIO) specifications 8.24 Low Power Comparator (LPCOMP) specifications 9 Mechanical specifications 9.1 QFN48 package 9.2 CDAB WLCSP package 9.3 CEAA WLCSP package 9.4 CFAC WLCSP package 10 Ordering information 10.1 Chip marking 10.2 Inner box label 10.3 Outer box label 10.4 Order code 10.5 Abbreviations 10.6 Code ranges and values 10.7 Product options 10.7.1 nRF ICs 10.7.2 Development tools 11 Reference circuitry 11.1 PCB guidelines 11.1.1 PCB layout example 11.2 Reference design schematics 11.3 QFAA QFN48 package 11.3.1 QFAA QFN48 schematic with internal LDO setup 11.3.2 QFAA QFN48 schematic with low voltage mode setup 11.3.3 QFAA QFN48 schematic with DC/DC converter setup 11.4 QFAB QFN48 package 11.4.1 QFAB QFN48 schematic with internal LDO setup 11.4.2 QFAB QFN48 schematic with low voltage mode setup 11.4.3 QFAB QFN48 schematic with DC/DC converter setup 11.5 QFAC QFN48 package 11.5.1 QFAC QFN48 schematic with internal LDO setup 11.5.2 QFAC QFN48 schematic with low voltage mode setup 11.5.3 QFAC QFN48 schematic with DC/DC converter setup 11.6 CDAB WLCSP package 11.6.1 CDAB WLCSP schematic with internal LDO setup 11.6.2 CDAB WLCSP schematic with low voltage mode setup 11.6.3 CDAB WLCSP schematic with DC/DC converter setup 11.7 CEAA WLCSP package 11.7.1 CEAA WLCSP schematic with internal LDO setup 11.7.2 CEAA WLCSP schematic with low voltage mode setup 11.7.3 CEAA WLCSP schematic with DC/DC converter setup 11.8 CFAC WLCSP package 11.8.1 CFAC WLCSP schematic with internal LDO setup 11.8.2 CFAC WLCSP schematic with low voltage mode setup 11.8.3 CFAC WLCSP schematic with DC/DC converter setup 12 Glossary