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参数资料
型号： XE8801AMI000WP
厂商： Semtech
文件页数： 100/135页
文件大小： 0K
描述： SENSING MACHINE WITH 16 + 10 BIT
标准包装： 558
系列： XE880x
应用： 感测机
核心处理器： Coolrisc816?
程序存储器类型： 闪存（22 kB）
控制器系列： XE8000
RAM 容量： 512 x 8
接口： UART，USRT
输入/输出数： 24
电源电压： 2.4 V ~ 5.5 V
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 模具
包装： 托盘
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称： Q2722595
Semtech 2005
www.semtech.com
12-4
XE8801A – SX8801R
if x is odd, PBOut[x, x-1]
PBPullup[x]
PB[x] selection on
00
1
analog line 0
01
1
analog line 1
10
1
analog line 2
11
1
analog line 3
XX
0
High impedance
Table 12-8: Selection of the analog lines for PB[x] when x is odd and PBAna[x] = 1
if x is even, PBDir[x+1, x]
PBPullup[x]
PB[x] selection on
00
1
analog line 0
01
1
analog line 1
10
1
analog line 2
11
1
analog line 3
XX
0
High impedance
Table 12-9: Selection of the analog lines for PB[x] when x is even and PBAna[x] = 1
Example:
Set the pads PB[2] and PB[3] on the analog line 3. (the values X depend on the configuration of others
pads)
-
apply high impedance in the analog mode (move RegPBPullup,#0bXXXX00XX)
-
go to analog mode (move RegPBAna,#0bXXXXXX1X)
-
select the analog line3 (move RegPBDir,#0bXXXX11XX and move RegPBOut,#0bXXXX11XX)
-
connect the analog line to the pins (move RegPBPullup,#0bXXXX11XX)
12.5.2
Port B analog function specification
The table below defines the on-resistance of the switches between the pin and the analog bus for different
conditions. The series resistance between 2 pins of Port B connected to the same analog line is twice the
resistance given in the table.
sym
description
min
typ
max
unit
Comments
Ron
switch resistance
11
k
Note 1
Ron
switch resistance
15
k
Note 2
Cin
input capacitance (off)
3.5
pF
Note 3
Cin
input capacitance (on)
4.5
pF
Note 4
Table 12-10. Analog input specifications.
Note 1: This is the series resistance between the pad and the analog line in 2 cases
1. VBAT
≥ 2.4V and the VMULT peripheral is present on the circuit and enabled.
2. VBAT
≥ 3.0V and the VMULT peripheral is not present on the circuit.
Note 2: This is the series resistance in case VBAT
≥ 2.8V and the peripheral VMULT is not present on the circuit.
Note 3: This is the input capacitance seen on the pin when the pin is not connected to an analog line. This value is
indicative only since it is product and package dependent.
Note 4: This is the input capacitance seen on the pin when the pin is connected to an analog line and no other pin
is connected to the same analog line. This value is indicative only since it is product and package dependent.
Not
Recommended
for
New
Designs
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