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3. TECHNICAL BRIEF
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3.11 Battery current consumption monitor
KE820/KG99 use a current monitoring function to calculate the battery capacity and the remaining
time, as monitoring current flow from the battery thru 47mohm resistor.
3.12 JTAG & ETM interface connector
In key back-light illumination, there are 14 Blue LEDs in Main Board, which are driven by
KEY_BACKLIGHT signal from AD6720.
U201
ZXCT1010E5TA
GND
2
3
IOUT
LOAD
51
NC
VIN
4
VSUPPLY VBAT
1K
R207
R204
47mohm
C204
1u
3
CN201
G1
G2
1
2
C205
27p
2.2K
R210
BATT_TEMP
I_MONITOR
27
28
29
30
17
18
19
20
21
22
23
24
G1 G2
G3 G4
11
12
13
14
15
2
3
4
5
6
7
8
9
16
25
26
CN101
1
10
TP129
1V8_MEM
NA
R132
TP130
2V72_IO
R133
NA
TRIG_OUT
_TRST
TDI
TMS
TCK
RTCK
TDO
_EXTRST
TRIG_IN
TRACEPKT(7)
TRACEPKT(0:7)
MON1
MON2
TRACEPKT(4)
TRACEPKT(5)
TRACEPKT(6)
TRACECLK
TRACESYNC
PIPESTAT0
PIPESTAT1
PIPESTAT2
TRACEPKT(0)
TRACEPKT(1)
TRACEPKT(2)
TRACEPKT(3)
Figure 19 Current monitor circuit
Figure 20 JTAG & ETM(Embedded Trace Module) interface connector