Datasheet

FDS 6531/6532 005 Data Sheet 71M6531D/F-71M6532D/F
Rev 2 103
5.4.13 Temperature Sensor
Table 82 shows the performance for the temperature sensor. The LSB values do not include the 8-bit left
shift at CE input.
Table 82: Temperature Sensor Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
Nominal relationship: N(T) = S
n
*(T-T
n
) + N
n
, T
n
= 25ºC
Nominal Sensi-
tivity (S
n
)
2
3
3
00109.0






⋅−=
L
S
n
[M40MHZ, M26MH] =
[00], [10], or [11]
FIR_LEN[1:0]=0
(L=138)
FIR_LEN[1:0]=1
(L=288)
FIR_LEN[1:0]=2
(L=384)
-106
-964
-2286
LSB/ºC
[M40MHZ, M26MHZ] =
[01]
FIR_LEN[1:0]=0
(L=186)
FIR_LEN[1:0]=1
(L=384)
FIR_LEN[1:0]=2
(L=588)
-260
-2286
-8207
NominalOffset
(N
n
)
2
3
3
508.0






⋅=
L
N
n
[M40MHZ, M26MHZ] =
[00], [10], or [11]
FIR_LEN[1:0]=0
(L=138)
FIR_LEN[1:0]=1
(L=288)
FIR_LEN[1:0]=2
(L=384)
49447
449446
1065353
LSB
[M40MHZ, M26MHZ] =
[01]
FIR_LEN[1:0]=0
(L=186)
FIR_LEN[1:0]=1
(L=384)
FIR_LEN[1:0]=2
(L=588)
121071
1065353
3825004
Temperature Error
†






−
−=
n
n
S
NTN
TERR
))((
T
n
= 25°C,
T = -40ºC to +85ºC
-10
1
+10
1
ºC
†
Temperature error is calculated with the value N
n
, which is measured at T
n
during meter calibration and
is stored in MPU or CE for use in temperature calculations.
1
Guaranteed by design; not production tested.
2
This specification defines a nominal relationship rather than a measured parameter. Correct circuit op-
eration is be verified with other specifications that use this nominal relationship as a reference.
5.4.14 VREF
Table 83 shows the performance specifications for VREF. Unless otherwise specified, VREF_DIS = 0.
Table 83: VREF Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
VREF output voltage, VREF(22)
Ta = 22ºC
1.193
1.195
1.197
V
VREF chop step
40
mV
VREF power supply sensitivity
ΔVREF / ΔV3P3A
V3P3A = 3.0 to 3.6 V
-1.5 1.5 mV/V
VREF input impedance
VREF_DIS = 1,
VREF = 1.3 to 1.7 V
100 kΩ