Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
5.4.13 Temperature Sensor
Table 76 shows the performance for the temperature sensor. The LSB values do not include the 8-bit left
shift at CE input.
Table 76: Temperature Sensor Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
Nominal relationship: N(T) = Sn*(T-Tn) + Nn, Tn = 25ºC
-106
-964
-2286
LSB/ºC
Nominal Sensi-
tivity (Sn)4
FIR_LEN=0 (L=138)
FIR_LEN=1 (L=288)
FIR_LEN=2 (L=384)
[M40MHZ, M26MH] =
[00], [10], or [11]
3
L
S = −0.00109⋅
n
-260
-2286
-8207
FIR_LEN=0 (L=186)
FIR_LEN=1 (L=384)
FIR_LEN=2 (L=588)
3
[M40MHZ, M26MHZ] =
[01]
49447
449446
1065353
LSB
FIR_LEN=0 (L=138)
FIR_LEN=1 (L=288)
FIR_LEN=2 (L=384)
NominalOffset
(Nn) 4
[M40MHZ, M26MHZ] =
[00], [10], or [11]
3
L
N = 0.508⋅
FIR_LEN=0 (L=186)
FIR_LEN=1 (L=384)
FIR_LEN=2 (L=588)
121071
1065353
3825004
n
[M40MHZ, M26MHZ] =
[01]
3
Temperature Error 1
Tn = 25°C,
T = -40ºC to +85ºC
(N(T) − Nn )
-10
10
ºC
ERR = T −
Sn
Nn is measured at Tn during meter calibration and is stored in MPU or CE for use in temperature calcula-
tions.
5.4.14 VREF
Table 77 shows the performance specifications for VREF. Unless otherwise specified, VREF_DIS = 0.
Table 77: VREF Performance Specifications
Parameter
Condition
Ta = 22ºC
Min
Typ
Max
1.197
40
Unit
V
VREF output voltage, VREF(22)
VREF chop step
1.193
1.195
mV
VREF power supply sensitivity
V3P3A = 3.0 to 3.6 V
-1.5
100
1.5
mV/V
ΔVREF / ΔV3P3A
VREF_DIS = 1,
VREF = 1.3 to 1.7 V
VREF input impedance
VREF output impedance
VNOM definitiona
kΩ
CAL =1,
ILOAD = 10 µA, -10 µA
VNOM (T) = VREF(22) + (T − 22)TC1⋅10−6 + (T − 22)2 TC2⋅10−6
2.5
kΩ
V
VNOM temperature coefficients:
TC1
TC2
3.18·(52.46-TRIMT)
µV/ºC
-0.444
µV/°C2
VREF(T) deviation from VNOM(T)
VREF(T) −VNOM (T)
VNOM (T)
106
-40
+40
PPM/ºC
max(T − 22 ,40)
PPM/
year
VREF aging
±25
a This relationship describes the nominal behavior of VREF at different temperatures.
100
© 2005-2009 TERIDIAN Semiconductor Corporation
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