参数资料
型号: XE8000EV104
厂商: Semtech
文件页数: 60/156页
文件大小: 0K
描述: EVAL BOARD FOR XE8805AMI028LF
标准包装: 1
类型: MCU
适用于相关产品: XE88LC05AMI028
所含物品: 完全组装的评估板
Semtech 2006
www.semtech.com
21-2
XE8805/05A
21.1 Features
Can be switched off, on or simultaneously with CPU activities
Generates an interrupt if power supply is below a pre-determined level
21.2 Overview
The Voltage Level Detector 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).
21.3 Register map
There are two registers in the VLD, namely RegVldCtrl and RegVldStat. Table 221-1 shows the mapping of
control bits and functionality of RegVldCtrl while Table 221-2 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
1 : 2.55V
2-0
VldTune[2:0]
r w
000
resetsystem
VLD tuning:
000 : +19 %
111 : -18 %
Table 221-1: 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 221-2: RegVldStat
21.4 Interrupt map
interrupt source
mapping in the interrupt manager
IrqVld
RegIrqMid(2)
Table 221-3: Interrupt map
21.5 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.
Disabled, the block will dissipate no power.
Not
Recommended
for
New
Designs
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