XE1205SKC868XE1 Semtech, XE1205SKC868XE1 Datasheet - Page 39

• Manufacturer Part Number: XE1205SKC868XE1
• Description: KIT STARTER FOR XE1205 868MHZ
• Manufacturer: Semtech
• Series: TrueRF™r
• Type: Transceiver, ISMr

Specifications of XE1205SKC868XE1

• Frequency: 868MHz
• For Use With/related Products: XE1205 (868MHz)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

specification. OSCParam_Resxosc(3:0) is set to ”0000’’ by default, which selects a parallel resistor of 3.8 MΩ. This
default value is used with a 39 MHz crystal enabled on its fundamental frequency.
In the case of overtone operation where the microcontroller uses the XE1205 as a clock source, the user should note
that during the power up sequence of the XE1205, the oscillator may start and run at its fundamental frequency until the
correct value of parallel resistor in the register OSCParam_Resxosc(3:0) is programmed. Before time-sensitive
operations an oscillator settling period should be observed to ensure the desired oscillation frequency.
Wh
user-programmable frequency divider ratio of 2, 4, 8, 16, 32 is selectable depending on OSCParam_Clkout_freq(2:0).
The input frequency of this divider is the 39.0 MHz reference clock; the possible output frequencies are listed in Table
27:
When the XE1205 is in sleep mode, CL
Th
exception is the CLKOUT generation: though OSCParam_Clkout is set to low (i.e. disabled) the XE1205 provides a
signal at 1.22 MHz on the pin CLKOUT.
T
disabled. For this reason the first programming sequence should be to enable CLKOUT by setting OSCParam_Clkout to
high for applications using CLKOUT. It is recommended to initialize the XE1205 registers immediately after power-up.
© Semtech 2008
he first rising edge on the NSS_CONFIG pin causes the registers to be updated and this will result in CLKOUT being
e inte nally generated power on reset signal s
7.5
7.6
en OSCParam_Clkout is set high, a CLKO
r
CLOCK OUTPUT INTERFACE
DEFAULT SETTINGS AT POWER-UP
OSC_Param_Clkout_freq(1:0)
KOUT is inactive even if bit OSCParam
others
000
001
010
011
Table 27: Frequency divider ou
UT clock frequency is provided for a microcontroller or external circuitry. A
ets the MCParam, RXParam, and TXParam registers to ‘0’. The only
39
CLKOUT frequency
tput
1.22 MHz
2.44 MHz
4.87 MHz
9.75 MHz
19.5 MHz
_Clkout remains high.
XE1205
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