NRF403-IC ETC, NRF403-IC Datasheet - Page 10

• Manufacturer Part Number: NRF403-IC
• Description: 315/433 MHz Single Chip RF Transceiver
• Manufacturer: ETC

PRODUCT SPECIFICATION
nRF403 Single Chip RF Transceiver
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.
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
Figure 11. nRF403 and a micro-controller sharing the reference crystal.
components
External
Internal
Figure 10. Crystal oscillator and crystal equivalent.
Vestre Rosten 81, N-7075 Tiller, Norway -
22pF
C1
C1
X1
oscillator
Crystal
controller
4.0 MHz
Crystal
micro
R
X2
Page 10 of 18
C2
22pF
C2
5.6pF
C
Phone [phone] - Fax [phone]
ESR
equivalent
XC1
XC2
Crystal
nRF403
Co
Cs
L
July 2001