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AS8510

Datasheet - Electrical Character i s t ics

6.4.5 Internal (Programmable) Current Source for External Temperature Measurement

Notes:

1. Current value can be programmed in steps of 8mAmps from 0 to 256 mA 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.

Table 19. External Temperature Measurement

Symbol

Parameter

Conditions

Min

Typ

Max

Units

5-bit current source enabled

1

5-bit programmable current source

0

270

320

µA

5-bit current source disabled

Limited by leakage

10

nA

Temperature coefficient of current source

2

1000

ppm

/ ºK

Voltage on pin ETR

3

1000/G

mV

Max voltage on pin ETR when PGA is

bypassed

4

1.22

V

Voltage on pin ETS for resistor sensor

3

1000/G

V

Max. Voltage on pin ETS when PGA is

bypassed

5

1.22

V