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| 型號(hào)： | XE8807AMI026TLF |
| 廠商： | Semtech |
| 文件頁(yè)數(shù)： | 116/143頁(yè) |
| 文件大小： | 0K |
| 描述： | IC MCU LOW PWR MTP FLASH 32-TQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | XE880x |
| 應(yīng)用： | 感測(cè)機(jī) |
| 核心處理器： | Coolrisc816? |
| 程序存儲(chǔ)器類型： | 閃存（11 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： | 32-TQFP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 供應(yīng)商設(shè)備封裝： | 32-TQFP（7x7） |
| 產(chǎn)品目錄頁(yè)面： | 585 (CN2011-ZH PDF) |
| 配用： | XE8000MP-ND - PROG BOARD AND PROSTART2 CARD |
| 其它名稱： | XE8807AMI026DKR |
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Semtech 2006
www.semtech.com
12-5
XE8806A/XE8807A
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.
12.6
Port B function capability
The Port B can be used for different functions implemented by other peripherals. The description below is
applicable only in so far the circuit contains these peripherals.
When the counters are used to implement a PWM function (see the documentation of the counters), the PB[0] and
PB[1] terminals are used as outputs (PB[0] is used if CntPWM0 in RegCntConfig1 is set to 1, PB[1] is used if
CntPWM1 in RegCntConfig1 is set to 1) and the PWM generated values override the values written in RegPBout.
However, PBDir(0) and PBDir(1) are not automatically overwritten and have to be set to 1.
If Output16k is set in RegSysMisc, the frequency is output on PB[3]. This overrides the value contained in
PBOut(3). However, PBDir(3) must be set to 1. The frequency and duty cycle of the clock signal are given in
Figure 12-1. fmax is the frequency of fastest clock present in the circuit.
1/16k
1/fmax
Figure 12-1. 16 kHz output clock timing
Similarly, if OutputCkCpu is set in RegSysMisc, the CPU frequency is output on PB[2]. This overrides the value
contained in PBOut(2). However, PBDir(2) must be set to 1.
1/f2
1/f1
Figure 12-2. CPU output clock timing.
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