7 temperature sensor, 8 vref, Temperature sensor – Rainbow Electronics 78M6631 User Manual
Page 19: Vref, Table 12: vref performance specifications
DS_6631_056
78M6631 Data Sheet
Rev 1
19
2.4.7 Temperature Sensor
shows the performance for the temperature sensor. The LSB values do not include the 8-bit left
shift at CE input.
Table 11: Temperature Sensor Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
Nominal relationship: N(T) = S
n
*(T-T
n
) + N
n
, T
n
= 22ºC
Nominal
Sensitivity (S
n
)
3
n
3
L
00107
.
0
S
⋅
−
=
[M26MHZ, M40MH] =
[00], [01], or [11]
FIR_LEN= 0 (L=138)
FIR_LEN=1 (L=288)
-104
-947
LSB/ºC
[M26MHZ, M40MHZ] =
[10]
FIR_LEN=0 (L=186)
-255
Nominal Offset
(N
n
)
4
3
n
3
L
510
.
0
N
⋅
=
[M26MHZ, M40MH] =
[00], [01], or [11]
FIR_LEN=0 (L=138)
FIR_LEN=1 (L=288)
49641
451200
LSB
[M26MHZ, M40MHZ] =
[10]
FIR_LEN=0 (L=186)
121500
Temperature Error
2
+
−
−
=
n
n
n
T
S
N
T
N
T
ERR
)
)
(
(
T
n
= 22°C,
T = -40ºC to +85ºC
-10
1
+10
1
ºC
1
Guaranteed by design; not production tested.
2
N
n
is measured at T
n
during measurement calibration and is stored in MPU or CE for use in temperature
calculations.
2.4.8 VREF
shows the performance specifications for VREF. Unless otherwise specified, VREF_DIS = 0.
Table 12: VREF Performance Specifications
Parameter
Condition
Min
Typ
Max
Unit
VREF output voltage, VREF(22)
T
A
= +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
VREF output impedance
CAL =1,
I
LOAD
= 10 µA, -10 µA
2.5
kΩ
VNOM definition
2
2
)
22
(
1
)
22
(
)
22
(
)
(
2
TC
T
TC
T
VREF
T
VNOM
−
+
−
+
=
V
VNOM temperature coefficients:
TC1
TC2
3.18·(52.46-TRIMT)
-0.444
µ
V/ºC
µ
V/°C
2
VREF(T) deviation from VNOM(T)
)
40
,
22
max(
10
)
(
)
(
)
(
6
−
−
T
T
VNOM
T
VNOM
T
VREF
-40
1
+40
1
ppm/ºC
VREF aging
±
25
ppm/year
1
Guaranteed by design; not production tested.
2
This relationship describes the nominal behavior of VREF at different temperatures.