User Manual

TiWi-uB2 / uBleu2 Module
DATASHEET
The information in this document is subject to change without notice.
TiWi-uB2 uBleu2 Datasheet Copyright © 2012 LS Research, LLC Page 12 of 25
SLOW CLOCK (32 KHZ) SOURCE REQUIREMENTS
External Slow Clock signal characteristics
Characteristic
Condition
Sym
Min
Typ
Max
Unit
Input slow clock frequency
32768
Hz
Input slow clock accuracy
(Initial + temp + aging)
-250
250
ppm
Input transition time
t
r
/t
f
- 10% to 90%
t
r
/t
f
100
ns
Frequency input duty cycle
15
50
85
%
Phase noise
At 1 kHz
-125
dBc/Hz
Jitter
Integrated over
300 to 15000 Hz
1
Hz
Slow clock input voltage limits
Square wave,
DC coupled
V
IH
0.65 x
VDD_IO
VDD_IO
V peak
V
IL
0
0.35 x
VDD_IO
V peak
Input impedance
1
MΩ
Input capacitance
5
pF
Table 14 32 kHz Clock Requirements