nRF903 Nordic VLSI, nRF903 Datasheet - Page 10

• Manufacturer Part Number: nRF903
• Description: Multichannel RF Transceiver 433/868/915MHz
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
Transceiver parameters are clocked into the data shift register in the internal
configuration unit by using the three-pin serial interface consisting of CS, CFG_CLK
and CFG_DATA.
Chip select (CS) is used to enable the transceiver configuration mode. Figure 6
illustrates the serial interface block diagram.
During configuration, CS is set high and the configuration word is clocked in with the
MSB first. After the configuration word has been clocked into the shift register, CS is
set low and the new configuration setup is initialised.
Timing diagram is shown in Figure 7. CFG_DATA bitrate may not exceed 1Mbit/s.
Once configured, device behaviour is set by the external signals TXEN, PWR_DWN,
STBY and DATA (DATA is an input pin in transmit-mode, output in receive-mode).
Configuration may be performed in all modes except standby and power down mode.
Register content is still valid after power down and standby mode operation.
Configuration data is lost only when supply voltage has been removed.
Nordic VLSI ASA
Revision: 3.1
Figure 6. Serial Pheripheral Interface (SPI) for chip configuration
-
CFG_DATA
CFG_CLK
CS
Vestre Rosten 81, N-7075 Tiller, Norway
pin 11
pin 10
pin 12
Qhtrà ÂsÃ"!
Internal tranceiver control
-
and config. register
Data shift register
Phone [phone]
Decoding unit
-
Fax [phone]
December 2002