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EM250
Table 12 lists the specifications for the high-frequency crystal.
Table 12. High-Frequency Crystal Specifications
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Frequency
24
MHz
Duty cycle
Phase noise from 1kHz to 100kHz
40
60
- 120
%
dBc/Hz
Accuracy
Crystal ESR
Crystal ESR
Start-up time to stable clock (max. bias)
Start-up time to stable clock (optimum bias)
Current consumption
Current consumption
Current consumption
Initial, temperature, and aging
Load capacitance of 10pF
Load capacitance of 18pF
Good crystal: 20 ? ESR, 10pF load
Worst-case crystals (60 ? , 18pF or
100 ? , 10pF)
At maximum bias
- 40
0.2
+ 40
100
60
1
2
0.3
0.5
1
Ppm
?
?
Ms
Ms
mA
mA
mA
4.11.2 Low-Frequency Oscillator
The optional low-frequency crystal source for the EM250 is a 32.768kHz crystal. Table 13 lists the
requirements for the low-frequency crystal. The low-frequency crystal may be used for applications that
require greater accuracy than can be provided by the internal RC oscillator. When using the internal RC
Oscillator, the pins OSC32A and OSC32B can be left open (or not connected). If the designer would like to
implement the low frequency clock source with an external digital logic source, then the OSC32A pin should
be connected to the clock source with OSC32B left open.
The crystal oscillator has been designed to accept any standard watch crystal with an ESR of 100 k ? (max). In
order to keep the low frequency oscillator from being overdriven by the 32.768kHz crystal, Silicon Labs
recommends the PCB designer asymmetrically load the capacitor with 18pF on OSC32A and 27pf on OSC32B.
For more information on this design recommendation, please review document AN695, Designing with an
EM250.
Table 13. Low-Frequency Crystal Specifications
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Frequency
32.768
kHz
Accuracy
Load capacitance (18pF on OSC32A and 27pF on
Initial, temperature, and aging
- 100
12.5
+ 100
Ppm
pF
OSC32B)
Crystal ESR
Start-up time
100
1
k ?
S
Current consumption
120-0082-000V Rev 1.1
At 25 ? C, VDD_PADS=3.0V
Page 24
0.6
μ A
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