AS8510
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6.4.5 Internal (Programmable) Current Source for External Temperature Measurement
Table 19. External Temperature Measurement
Symbol Parameter
I
I
CURON
CUROFF
5-bit current source enabled
1
5-bit current source disabled
Conditions
5-bit programmable current source
Limited by leakage
Min
0
T
K
_
CS
Temperature coefficient of current source
2
V
MAXETR
V
MAXETRMOD
V
MAXETS
V
MAXETSMOD
Voltage on pin ETR
3
Max voltage on pin ETR when PGA is bypassed
4
Voltage on pin ETS for resistor sensor
3
Max. Voltage on pin ETS when PGA is bypassed
5
Typ
270
10
1000
Max
320
1000/G
1.22
1000/G
1.22
V
V
V
Units
µA nA ppm
/ ºK mV
Notes:
1. Current value can be programmed in steps of 8 μ A from 0 to 256 μ A with a process error of 30%.
2. Temperature coefficient is not important since external temperature measurement is a 2 step measurement. The value specified is guaranteed by design and will not be tested in production.
3. Maximum voltage on pin ETR (reference) can be calculated by given formula, where G is the gain of PGA (G=100).
4. Maximum voltage on pin ETR, if PGA is bypassed.
5. Maximum voltage on pin ETS, if PGA is bypassed.
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