NRF403 Datasheet, PDF (10/15 Pages) List of Unclassifed Manufacturers – 315/433 MHz Single Chip RF Transceiver

PRODUCT SPECIFICATION
nRF403 Single Chip RF Transceiver
Internal
External
components
Crystal
oscillator
R
Crystal
C1
C2
Crystal
equivalent
Co
ESR Cs L
Figure 10. Crystal oscillator and crystal equivalent.
Sharing a reference crystal with a micro-controller
Figure 11 shows circuit diagram of a typical application where nRF403 and a micro
controller share the reference crystal.
micro
controller
X1
X2
C
5.6pF
XC1
nRF403
XC2
C1 4.0 MHz
22pF
C2
22pF
Figure 11. nRF403 and a micro-controller sharing the reference crystal.
The crystal reference line from the micro-controller should not be routed close to full
swing digital data or control signals.
Transmit/receive mode selection
TXEN is a digital input for selection of transmit or receive mode.
TXEN = “1” selects transmit mode.
TXEN = “0” selects receive mode.
Frequency band (315/433 MHz) selection
FREQ is a digital input for selection of either 433MHz or 315MHz frequency band
operation.
FREQ = “0” selects 433.92 MHz.
FREQ = “1” selects 315.16 MHz.
Nordic VLSI ASA -
Revision: 1.1
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 10 of 18
Phone [phone] - Fax [phone]
July 2001