SX8801IRXXMLTRT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8801IRXXMLTRT' PDF : 135 Pages View PDF
XE8801A – SX8801R
fRC=fRcmin⋅(1+9⋅RcFreqRange)⋅(1+RcFreqCoarse)⋅(1.014)RcFreqFine
with fRcmin the RC oscillator frequency if the registers are all 0. At higher frequencies, the frequency may deviate
from the value predicted by the equation.
1E+08
RcFreqRange='1'
RcFreqRange='0'
1E+07
RcFreqFine(5:0)
1E+06
000000
010000
100000
110000
111111
1E+05
000000
010000
100000
110000
111111
010000
010000
100000
100000
110000 111111
110000 111111
010000
010000
100000
100000
110000 111111
110000 111111
010000
010000
100000
100000
110000 111111
110000 111111
010000 100000 110000 111111
010000 100000 110000 111111
RcFreqFine(5:0)
1E+04
0000
0001
0011
0111
RcFreqCoarse(3:0)
1111
Figure 7-2. RC oscillator nominal frequency tuning.
7.5.1.3 RC oscillator specifications
symbol
description
min
typ
max
fRCmin
Lowest RC frequency
40
80
120
RcFreqFine fine tuning step
1.4
2.0
RC_su
startup time
30
50
3
5
PSRR @ DC Supply voltage
TBD
dependence
TBD
∆f/∆T
Temperature
0.1
dependence
Table 7-7. RC oscillator specifications
Note 1: this is the frequency tolerance when all trimming codes are 0.
unit
kHz
%
us
us
%/V
%/V
%/°C
Comments
Note 1
BiasRc=0
BiasRc=1
Note 2
Note 3
Note 2: frequency shift as a function of VBAT with normal regulator function.
Note 3: frequency shift as a function of VBAT while the regulator is short-circuited to VBAT.
© Semtech 2005
www.semtech.com
7-5
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