71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
LOW POWER VOLTAGE REGULATOR
Unless otherwise specified, V3P3SYS=V3P3A=0, PB=GND (BROWNOUT)
PARAMETER
V2P5
CONDITION
ILOAD=0
MIN
2.0
TYP
2.5
MAX
2.7
UNIT
V
V2P5 load regulation
ILOAD=0mA to 1mA
ILOAD=1mA,
30
mV
VBAT voltage requirement
Reduce VBAT until
REG_LP_OK=0
ILOAD=0
3.0
50
V
PSRR ΔV2P5/ΔVBAT
-50
mV/V
CRYSTAL OSCILLATOR
PARAMETER
CONDITION
Crystal connected
MIN
TYP
MAX
1
3
UNIT
μW
pF
Maximum Output Power to Crystal
XIN to XOUT Capacitance
Capacitance to DGND
XIN
5
5
pF
pF
XOUT
VREF, VBIAS
Unless otherwise specified, VREF_DIS=0
PARAMETER
VREF output voltage, VNOM(25)
VREF chop step
CONDITION
Ta = 22ºC
MIN
1.193
TYP
1.195
MAX
1.197
50
UNIT
V
mV
VREF_CAL =1,
ILOAD = 10µA, -10µA
VNOM(T) =VREF(22)+(T −22)TC1+(T −22)2 TC2
VREF output impedance
VNOM definitionA
2.5
kΩ
V
VREF temperature coefficients
+7.0
-0.341
µV/ºC
TC1
TC2
µV/°C2
VREF aging
ppm/year
±25
VREF(T) deviation from VNOM(T)
VREF(T) −VNOM(T) 106
Ta = -40ºC to +85ºC
-40
+40
ppm/ºC
VNOM
62
Ta = 25ºC
Ta = -40ºC to 85ºC
(-1%)
(-4%)
1.6
1.6
(+1%)
(+4%)
V
V
VBIAS voltage
A This relationship describes the nominal behavior of VREF at different temperatures.
V1.0
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