71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
RECOMMENDED EXTERNAL COMPONENTS
NAME
C1
C2
CSYS
C2P5
FROM
V3P3A
V3P3D
V3P3SYS
V2P5
TO
FUNCTION
VALUE
≥0.1±20%
0.1±20%
≥1.0±30%
0.1±20%
UNIT
μF
μF
μF
μF
AGND
DGND
DGND
DGND
Bypass capacitor for 3.3V supply
Bypass capacitor for 3.3V output
Bypass capacitor for V3P3SYS
Bypass capacitor for V2P5
32.768kHz crystal – electrically similar to ECS
.327-12.5-17X or Vishay XT26T, load capaci-
tance 12.5pF
XTAL
XIN
XOUT
32.768
kHz
Load capacitor for crystal (depends on crystal
specs and board parasitics).
Load capacitor for crystal (depends on
crystal specs and board parasitics).
CXS †
CXL †
XIN
AGND
AGND
pF
pF
27±10%
27±10%
XOUT
†
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
CONDITION
Normal Operation
Battery Backup
MIN
3.0
0
TYP
3.3
MAX
3.6
3.6
UNIT
V
V
3.3V Supply Voltage (V3P3SYS, V3P3A)
V3P3A and V3P3SYS must be at the
same voltage
No Battery
Externally Connect to V3P3SYS
Battery Backup
BRN and LCD modes
SLEEP mode
VBAT
3.0
2.0
-40
3.8
3.8
+85
V
V
ºC
Operating Temperature
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
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
