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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 8

μA from 0 to 256μA 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.

6.4.6 CMREF Circuit (VCM)

6.4.7 Internal AVDD Power-on Reset

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

Table 20. CMREF Circuit

Symbol

Parameter

Min

Typ

Max

Units

Output voltage

1.6

1.7

1.8

V

Load capacitance

100

nF

Table 21. Internal AVDD Power-on Reset

Symbol

Parameter

Min

Typ

Max

Units

V

PORHIA

Power On Reset Threshold

2.2

2.4

2.6

V

t

PORA

POR time - The duration from Power ON till

the time, internal Power On Reset signal

goes HIGH

1

1µs

I

PORA

Current consumption in POR block

2

2. I

1.5

µA