参数资料
型号: XE8000EV108
厂商: Semtech
文件页数: 84/143页
文件大小: 0K
描述: EVAL BOARD FOR XE8806/XE8807
标准包装: 1
类型: MCU
适用于相关产品: XE88LC06AMI026
所含物品: 完全组装的评估板
产品目录页面: 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
7-6
XE8806A/XE8807A
00
0000
010
00
0
10
0000
11
0000
11
010
000
100000
1100
00
11111
1
010000
100
000
110
000
111
010
000
10
0000
1100
00
11
1111
01
0000
1000
00
11
0000
1111
11
00
000
0
010
00
0
10
000
0
11
0000
1111
11
0100
00
100
000
1100
00
11
1111
010
000
100
000
110
000
11
1111
010
000
100
000
11000
0
11
111
1
01
00
1000
00
11
00
111
0000
0001
0011
0111
1111
1E+04
1E+05
1E+06
1E+07
RcFreqCoarse(3:0)
Nomina
lRC
os
c
illa
to
rf
re
que
nc
y
[
H
z]
RcFreqRange='1'
RcFreqRange='0'
RcFreqFine(5:0)
Figure 7-2. RC oscillator nominal frequency tuning.
7.6.3
RC oscillator specifications
sym
description
min
typ
max
unit
Comments
fRCmin
Lowest RC frequency
25
40
55
kHz
Note 1
RcFreqFine
fine tuning step
1.4
2.0
%
RC_su
startup time
30
50
us
BiasRc=0
3
5
us
BiasRc=1
PSRR @ DC
Supply voltage
TBD
%/V
Note 2
dependence
TBD
%/V
Note 3
f/T
Temperature
dependence
0.1
%/
°C
Table 7-8. RC oscillator specifications
Note 1: this is the frequency tolerance when all trimming codes are 0. The frequency at start-up is about twice as
high.
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.
The tolerances on the minimal frequency and the drift with supply or temperature can be cancelled using the
software or hardware DFLL (digital frequency locked loop) which uses the crystal oscillator as a reference
frequency.
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