71M6521DE Datasheet, PDF (90/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
RECOMMENDED EXTERNAL COMPONENTS
NAME
C1
C2
CSYS
C2P5
XTAL
CXS ^†
CXL ^†
FROM
V3P3A
V3P3D
V3P3SYS
V2P5
XIN
XIN
XOUT
TO
AGND
DGND
DGND
DGND
XOUT
AGND
AGND
FUNCTION
Bypass capacitor for 3.3 V supply
Bypass capacitor for 3.3 V output
Bypass capacitor for V3P3SYS
Bypass capacitor for V2P5
32.768 kHz crystal – electrically similar to ECS
.327-12.5-17X or Vishay XT26T, load capaci-
tance 12.5 pF
Load capacitor for crystal (exact value depends
on crystal specifications and parasitic capaci-
tance of board).
VALUE
≥0.1±20%
0.1±20%
≥1.0±30%
0.1±20%
UNIT
µF
µF
µF
µF
32.768
kHz
27±10%
pF
27±10%
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 35pF to 37pF.
RECOMMENDED OPERATING CONDITIONS
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. *
CONDITION
Normal Operation
Battery Backup
No Battery
Battery Backup
BRN and LCD modes
SLEEP mode
MISSION mode
BROWNOUT mode
LCD mode
MIN TYP
3.0
3.3
0
MAX
3.6
3.6
UNIT
V
V
Externally Connect to V3P3SYS
3.0
3.8
V
2.0
3.8
V
-40
+85
ºC
V3P3SYS+0.3
V
VBAT+0.3
V
VBAT+0.3
V
*Exceeding this limit will distort the LCD waveforms on other pins.
Page: 90 of 107
Rev 2