71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
RECOMMENDED EXTERNAL COMPONENTS
NAME
C1
C2
CSYS
C2P5
FROM
V3P3A
V3P3D
V3P3SYS
V2P5
TO
AGND
DGND
DGND
DGND
FUNCTION
Bypass capacitor for 3.3V supply
Bypass capacitor for 3.3V output
Bypass capacitor for V3P3SYS
Bypass capacitor for V2P5
VALUE
≥ 0.1 ± 20%
0.1 ± 20%
≥ 1.0 ± 30%
0.1 ± 20%
UNIT
μ F
μ F
μ F
μ F
32.768kHz crystal – electrically similar to ECS
XTAL
XIN
XOUT
.327-12.5-17X or Vishay XT26T, load capaci-
32.768
kHz
tance 12.5pF
CXS ?
CXL ?
XIN
XOUT
AGND
AGND
Load capacitor for crystal (depends on crystal
specs and board parasitics).
Load capacitor for crystal (depends on
crystal specs and board parasitics).
27 ± 10%
27 ± 10%
pF
pF
?
Depending on trace capacitance, higher or lower values for CXS and CXL must be used. Capacitance from XIN to GNDD
and XOUT to GNDD (combining pin, trace and crystal capacitance) should be 30pF to 42pF.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
3.3V Supply Voltage ( V3P3SYS, V3P3A )
V3P3A and V3P3SYS must be at the
same voltage
CONDITION
Normal Operation
Battery Backup
MIN
3.0
0
TYP
3.3
MAX
3.6
3.6
UNIT
V
V
No Battery
Externally Connect to V3P3SYS
VBAT
Battery Backup
BRN and LCD modes
3.0
3.8
V
Operating Temperature
SLEEP mode
2.0
-40
3.8
+85
V
oC
Maximum input voltage on DIO/SEG pins
configured as DIO input. *
MISSION mode
BROWNOUT mode
LCD mode
V3P3SYS+0.3
VBAT+0.3
VBAT+0.3
V
V
V
*Exceeding this limit will distort the LCD waveforms on other pins.
Page: 84 of 97
? 2005-2008 TERIDIAN Semiconductor Corporation
V1.0
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