XE8806A SEMTECH [Semtech Corporation], XE8806A Datasheet - Page 133

• Manufacturer Part Number: XE8806A
• Description: Ultra Low-Power Low-Voltage
• Manufacturer: SEMTECH [Semtech Corporation]

18.1 Features
•
•
18.2 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).
18.3 Register map
There are two registers in the VLD, namely RegVldCtrl and RegVldStat. Table 18-2 shows the mapping of control
bits and functionality of RegVldCtrl while Table 18-3 describes that for RegVldStat.
18.4 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
register name
RegVldCtrl
RegVldStat
Table 18-4: Interrupt map
default mapping in the interrupt manager
Table 18-1: Vld registers
Table 18-3: RegVldStat
Table 18-2: RegVldCtrl
function
reserved
VLD detection voltage range for VldTune = “011”:
VLD tuning:
18-2
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
RegIrqMid(2)
XE8806A/XE8807A
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