xe8802 Semtech Corporation, xe8802 Datasheet - Page 185

• Manufacturer Part Number: xe8802
• Description: Data Acquisition Soc With 16+10 Bit Zoomingadc? Embedded Risc Controller And Lcd Driver
• Manufacturer: Semtech Corporation

21.1 Features
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 21-2 shows the mapping of control
bits and functionality of RegVldCtrl while Table 21-3 describes that for RegVldStat.
21.4 Interrupt map
© Semtech 2006
can be switched off, on or simultaneously with CPU activities
generates an interrupt if power supply is below a pre-determined level
pos.
7-3
2
1
0
pos.
7-4
3
2-0
RegVldStat
--
VldResult
VldValid
VldEn
RegVldCtrl
--
VldRange
VldTune[2:0]
interrupt source
IrqVld
rw
r
r
r
r w
rw
r
r w
r w
reset
00000
0 nresetglobal
0 nresetglobal
0 nresetglobal
reset
0000
0
nresetglobal
000
nresetglobal
XE8802 Sensing Machine Data Acquisition MCU
register name
RegVldCtrl
RegVldStat
Table 21-4: Interrupt map
default mapping in the interrupt manager
Table 21-1: Vld registers
Table 21-3: RegVldStat
Table 21-2: RegVldCtrl
function
reserved
VLD detection voltage range for VldTune = “011”:
VLD tuning:
21-2
function
reserved
is 1 when battery voltage is below the detection
voltage
Indicates when VldResult can be read
VLD enable
000 : +19 %
111 : -18 %
0 : 1.3V
1 : 2.55V
with ZoomingADC™ and LCD driver
RegIrqMid(2)
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