71m6521fe Maxim Integrated Products, Inc., 71m6521fe Datasheet - Page 87

• Manufacturer Part Number: 71m6521fe
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

†
and XOUT to GNDD (combining pin, trace and crystal capacitance) should be 35pF to 37pF.
*Exceeding this limit will distort the LCD waveforms on other pins.
v1.0
PARAMETER
3.3V Supply Voltage (V3P3SYS, V3P3A)
V3P3A and V3P3SYS must be at the
same voltage
VBAT
Operating Temperature
Maximum input voltage on DIO/SEG pins
configured as DIO input. *
Depending on trace capacitance, higher or lower values for CXS and CXL must be used. Capacitance from XIN to GNDD
NAME
CSYS
CXS
CXL
C2P5
XTAL
C1
C2
†
†
V3P3SYS
V3P3A
V3P3D
FROM
XOUT
V2P5
XIN
XIN
RECOMMENDED EXTERNAL COMPONENTS
RECOMMENDED OPERATING CONDITIONS
DGND
DGND
DGND
AGND
AGND
AGND
XOUT
TO
© 2005-2008 TERIDIAN Semiconductor Corporation
FUNCTION
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
Load capacitor for crystal (exact value depends
on crystal specifications and parasitic capaci-
tance of board).
CONDITION
Normal Operation
Battery Backup
No Battery
Battery Backup
BRN and LCD modes
SLEEP mode
MISSION mode
BROWNOUT mode
LCD mode
71M6521DE/71M6521FE
MIN
-40
3.0
3.0
2.0
0
Externally Connect to V3P3SYS
TYP
3.3
Energy Meter IC
V3P3SYS+0.3
VBAT+0.3
VBAT+0.3
MAX
+85
≥0.1±20%
≥1.0±30%
3.6
3.6
3.8
3.8
0.1±20%
0.1±20%
27±10%
27±10%
VALUE
32.768
DATASHEET
UNIT
JANUARY 2008
UNIT
Page: 87 of 101
kHz
ºC
μF
μF
μF
μF
pF
pF
V
V
V
V
V
V
V