User Manual

XR‐21A W
IFI modu
le
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1.3 Key parameter
Table1.1Descriptionofthemainparameters
Module model
XR-21A
Mounting
SMD16
Size(mm)
24*16*3(±0.2)
Cert.
FCC、CE、IC、REACH、RoHS
SPI Flash
32Mbit(default)
Interface
UART/GPIO/ADC/PWM/I2C/SPI
Number of GPIO
13
UART baud.
9600/19200/38400/115200/921600bps 
Freq.
2412~2462MHz 
Antenna
OnboardPCBantenna
Tx Power
802.11b:17±2dBm(@11Mbps) 
802.11g:15±2dBm(@54Mbps) 
802.11n:14±2dBm(@HT20,MCS7) 
Rx Sensitivity
CCK,1Mbps:-97dBm
CCK,11Mbps:-92dBm
6Mbps(1/2BPSK):-92dBm