XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 130

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

19.1 Features
•
•
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.
19.4 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.
© Semtech 2005
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 resetsystem
0 resetsystem
0 resetsystem
reset
0000
0 resetsystem
000
resetsystem
Table 19-3: Interrupt map
Table 19-2: RegVldStat
Table 19-1: RegVldCtrl
mapping in the interrupt manager
19-2
function
reserved
is 1 when battery voltage is below the detection
voltage
Indicates when VldResult can be read
VLD enable
function
reserved
VLD detection voltage range for VldTune = “011”:
VLD tuning:
000 : +19 %
111 : -18 %
0 : 1.3V (not used in XE8801A and SX8801R)
1 : 2.55V
RegIrqMid(2)
XE8801A – SX8801R
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