参数资料
型号: XE8801AMI000WP
厂商: Semtech
文件页数: 36/135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
19-2
XE8801A – SX8801R
19.1 Features
Can be switched off, on or simultaneously with CPU activities
Generates an interrupt if power supply is below a pre-determined level
19.2 Overview
The Voltage Level Detector (VLD) monitors the state of the system battery. It returns a logical high value (an
interrupt) in the status register if the supplied voltage drops below the user defined level (Vsb).
The VLD must be calibrated by setting VldTune bits during product manufacturing to cancel technology variation.
19.3 Register map
There are two registers in the VLD, namely RegVldCtrl and RegVldStat. Table 19-1 shows the mapping of control
bits and functionality of RegVldCtrl while Table 19-2 describes that for RegVldStat.
pos.
RegVldCtrl
rw
reset
function
7-4
--
r
0000
reserved
3
VldRange
r w
0 resetsystem
VLD detection voltage range for VldTune = “011”:
0 : 1.3V (not used in XE8801A and SX8801R)
1 : 2.55V
2-0
VldTune[2:0]
r w
000
resetsystem
VLD tuning:
000 : +19 %
111 : -18 %
Table 19-1: RegVldCtrl
pos.
RegVldStat
rw
reset
function
7-3
--
r
00000
reserved
2
VldResult
r
0 resetsystem
is 1 when battery voltage is below the detection
voltage
1
VldValid
r
0 resetsystem
Indicates when VldResult can be read
0
VldEn
r w
0 resetsystem
VLD enable
Table 19-2: RegVldStat
19.4 Interrupt map
interrupt source
mapping in the interrupt manager
IrqVld
RegIrqMid(2)
Table 19-3: Interrupt map
19.5 VLD operation
The VLD is controlled by VldRange, VldTune and VldEn. VldRange selects the voltage range to be detected,
while VldTune is used to fine-tune this voltage level in 8 steps. VldEn is used to enable (disable) the VLD with a
1(0) value respectively.
When disabled, the block dissipates no power.
Not
Recommended
for
New
Designs
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