NRF401 Datasheet, PDF (10/18 Pages) List of Unclassifed Manufacturers – 433MHz Single Chip RF Transceiver

PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
Crystal
oscillator
Internal
R
External
components
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 nRF401 and a micro
controller share the reference crystal.
micro
controller
X1
X2
C
5.6pF
XC1
nRF401
XC2
C1 4.0 MHz
22pF
C2
22pF
Figure 11. nRF401 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.
Channel#1 / Channel#2 selection
CS is a digital input for selection of either channel#1 (f₁=433.92MHz)
or channel#2 (f₂=434.33MHz).
CS = “0” selects channel#1.
CS = “1” selects channel#2.
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 10 of 18
Phone [phone] - Fax [phone]
May 2000