71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
AUGUST 2007
VREF, VBIAS
Unless otherwise specified, VREF_DIS=0
PARAMETER
CONDITION
Ta = 22ºC
MIN
TYP
MAX
1.197
40
UNIT
V
VREF output voltage, VNOM(25)
VREF chop step
1.193
1.195
mV
VREF_CAL = 1,
VREF output impedance
VNOM definitionA
2.5
kΩ
ILOAD = 10µA, -10µA
VNOM(T) = VREF(22) + (T–22)TC1 + (T–22)2TC2
V
-- If TRIMBGA and TRIMBGB available (6511H) --
VREF temperature coefficients
TC1 (linear)
x(33-0.28y) + 0.33y + 7.9
x(0.02-0.0002y) – 0.46
TC2 (quadratic)
µV/°C
µV/°C2
where x = 0.1TRIMBGB - 0.14(TRIMM[2:0]+0.5),
TRIMBGA, TRIMBGB, TRIMM[2:0]: See
TRIMSEL, TRIM registers
TEMP_ NOM
−500TRIM _ BGA−370000
4.7404
y =
900
VREF(T) deviation from VNOM(T)
VREF(T) −VNOM(T)
106
-10
10
ppm/ºC
VNOM
max(|T − 22 |,40)
-- If TRIMBGA and TRIMBGB not available (6511) --
VREF temperature coefficients
TC1 (linear)
7.0
µV/ºC
-0.341
µV/°C2
TC2 (quadratic)
VREF(T) deviation from VNOM(T)
VREF(T) −VNOM(T)
106
Ta = -40ºC to +85ºC
Ta = 25ºC
-40
+40
ppm/ºC
VNOM
max(|T − 22 |,40)
ppm/
year
V
VREF aging
±25
Ta = 25ºC
(-1%)
(-2%)
1.5
1.5
240
(+1%)
(+2%)
500
VBIAS output voltage
Ta = -40ºC to 85ºC
ILOAD = 1mA, -1mA
V
VBIAS output impedance
Ω
A This relationship describes the nominal behavior of VREF at different temperatures.
CRYSTAL OSCILLATOR
Crystal is disconnected. Test load is series 200pF, 100kΩ connected between DGND and XOUT.
PARAMETER
CONDITION
Crystal connected
MIN
TYP
MAX
UNIT
µW
Maximum Output Power to Crystal4
XIN to XOUT Capacitance1
Capacitance to DGND1
XIN
1
3
pF
5
5
25
pF
pF
kHz
XOUT
Watchdog RTC_OK threshold
Page: 86 of 95
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