ASC7621 datasheet(18/50 Pages) ETC2

18 / 50 page

- 18 -

www.andigilog.com

October 2006 - 70A06010

aSC7621

A remote diode temperature reading register will return a value of 8000h if the remote diode pins are not used by the board

designer or is not functioning properly. This reading will cause the zone limit bits (bits 4 and 6) in the Interrupt Status

Register (41h) and the remote diode fault status bit (bits 6 and 7) in the Interrupt Status Register 2 (42h) to be set. These

registers are read-only – a write to these registers has no effect.

Digital Output (2’s Complement)

High Byte

Low Byte

Temperature

10-Bit Resolution

Ignore

+125°C

0111

1101

.00

XXXX

+100°C

0110

0100

.00

XXXX

+50°C

0011

0010

.00

XXXX

+25°C

0001

1001

.00

XXXX

+10°C

0000

1010

.00

XXXX

+1.75°C

0000

0001

.11

XXXX

+0.25°C

0000

.01

XXXX

0°C

0000

.00

XXXX

-1.75°C

1111

1110

.01

XXXX

-55°C

1100

1001

.00

XXXX

Table 3 Relationship between Temperature and 2’s Complement Digital Output, -55°C to +125°C

Digital Output (2’s Complement)

High Byte

Low Byte

Temperature

10-Bit Resolution

Ignore

0°C

0000

.0000

-0.015625°C

1111

.1111

-0.03125°C

1111

.1111

-0.0625°C

1111

.1111

-0.125°C

1111

.1110

-0.25°C

1111

.1100

-0.5°C

1111

.1000

-1.0°C

1111

.0000

-1.75°C

1111

1110

.0100

-2.0°C

1111

1110

0000

-25.0°C

1110

0111

0000

-100°C

1001

1100

0000

-127°C

1000

0001

0000

Table 4 PECI Temperature Format

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