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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

ICURON

5-bit current source enabled

5-bit programmable current source

270

320

µA

ICUROFF

5-bit current source disabled

Limited by leakage

TK_CS

Temperature coefficient of current source

1000

ppm

/ ºK

VMAXETR

Voltage on pin ETR

1000/G

VMAXETRMOD

Max voltage on pin ETR when PGA is

bypassed

1.22

VMAXETS

Voltage on pin ETS for resistor sensor

1000/G

VMAXETSMOD

Max. Voltage on pin ETS when PGA is

bypassed

1.22

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