Datasheet

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SLAS491A − AUGUST 2005 − REVISED OCTOBER 2005
46
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MSP430x20x3 electrical characteristics over recommended ranges of supply voltage and
operating free-air temperature (unless otherwise noted) (continued)
SD16_A, temperature sensor (MSP430x20x3 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
TC
Sensor
Sensor temperature coefficient See Note 1 1.18 1.32 1.46 mV/K
V
Offset,Sensor
Sensor offset voltage See Note 1 −100 100 mV
Temperature sensor voltage
at T
A
= 85°C
3 V 435 475 515
V
Sensor
Sensor output voltage
(see Note 3)
Temperature sensor voltage
at T
A
= 25°C
3 V 355 395 435
mV
(see Note 3)
Temperature sensor voltage
at T
A
= 0°C (see Note 1)
3 V 320 360 400
NOTES: 1. Not production tested, limits characterized.
2. The following formula can be used to calculate the temperature sensor output voltage:
V
Sensor,typ
= TC
Sensor
( 273 + T [°C] ) + V
Offset,sensor
[mV] or
V
Sensor,typ
= TC
Sensor
T [°C] + V
Sensor
(T
A
= 0°C) [mV]
3. Results based on characterization and/or production test, not TC
Sensor
or V
Offset,sensor
.
SD16_A, built-in voltage reference (MSP430x20x3 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
V
REF
Internal reference voltage SD16REFON = 1, SD16VMIDON = 0 3 V 1.14 1.20 1.26 V
I
REF
Reference supply current SD16REFON = 1, SD16VMIDON = 0 3 V 190 280 µA
TC Temperature coefficient SD16REFON = 1, SD16VMIDON = 0 3 V 18 50 ppm/K
C
REF
V
REF
load capacitance
SD16REFON = 1, SD16VMIDON = 0
(see Note 1)
100 nF
I
LOAD
V
REF(I)
maximum load current SD16REFON = 1; SD16VMIDON = 0 3 V ±200 nA
t
ON
Turn on time
SD16REFON = 0 → 1;
SD16VMIDON = 0;
C
REF
= 100nF
3 V 5 ms
PSRR Line regulation SD16REFON = 1; SD16VMIDON = 0 3 V 10 uV/V
NOTES: 1. There is no capacitance required on V
REF
. However, a capacitance of at least 100nF is recommended to reduce any reference
voltage noise.
SD16_A, reference output buffer (MSP430x20x3 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
V
REF,BUF
Reference buffer output voltage SD16REFON = 1, SD16VMIDON = 1 3 V 1.2 V
I
REF,BUF
Reference Supply + Reference
output buffer quiescent current
SD16REFON = 1, SD16VMIDON = 1 3 V 385 600 µA
C
REF(O)
Required load capacitance
on V
REF
SD16REFON = 1, SD16VMIDON = 1 470 nF
I
LOAD,Max
Maximum load current on V
REF
SD16REFON = 1, SD16VMIDON = 1 3 V ±1 mA
Maximum voltage variation vs. load current |I
LOAD
| = 0 to 1mA 3 V −15 +15 mV
t
ON
Turn on time
SD16REFON = 0 → 1;
SD16VMIDON = 1;
C
REF
= 470nF
3 V 100 µs
SD16_A, external reference input (MSP430x20x3 only)
PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT
V
REF(I)
Input voltage range SD16REFON = 0 3 V 1.0 1.25 1.5 V
I
REF(I)
Input current SD16REFON = 0 3 V 50 nA