參數(shù)資料
型號： XE8801AMI027LF
廠商： Semtech
文件頁數(shù)： 100/135頁
文件大?。?/td> 0K
描述： IC DAS 16BIT FLASH 8K MTP 44LQFP
標準包裝： 800
系列： XE880x
應(yīng)用： 感測機
核心處理器： Coolrisc816?
程序存儲器類型： 閃存（22 kB）
控制器系列： XE8000
RAM 容量： 512 x 8
接口： UART，USRT
輸入/輸出數(shù)： 24
電源電壓： 2.4 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-VFQFN 裸露焊盤
包裝： 托盤
供應(yīng)商設(shè)備封裝： 44-MLPQ（7x7）
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
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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