November 2004

17

MIC280

MIC280

Micrel

Remote Temperature Low Limit High-Byte Register (TLOW1h)

8-bits, read/write

Remote Temperature Low Limit High-Byte Register

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

read/write

read/write

read/write

read/write

read/write

read/write

read/write

read/write

Low temperature limit for remote zone, most significant byte.

Bit

Function

Operation

D[7:0]

Low temperature limit for the remote zone, most significant byte.

Read/write

Power-up default value:

Read/Write command byte:

Each LSB represents one degree centigrade. The values are in a two’s complement binary format such that 0°C is reported

as 0000 0000b. See Temperature Data Format (above) for more details.

Any writes to a temperature limit register will result in the corresponding fault queue being purged and reset.

Security Register (LOCK)

8-bits, write once

Security Register

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

reserved

reserved

reserved

read/

read/

read/

read/

read/

write-once

write-once

write-once

write-once

write-once

Reserved

L4

L3

L2

L1

L0

Bit

Function

Operation*

D[7:5]

Reserved

Always write as zero

L4

Warm reset lockout bit

1 = RST bit disabled;

0 = unlocked

L3

Shutdown mode lockout bit*

1= shutdown disabled;

0 = unlocked

L2

Diode fault event lock bit

1 = locked, 0 = unlocked

L1

Remote over-temperature event lock bit

1 = locked, 0 = unlocked

L0

Local over-temperature event lock bit

1 = locked, 0 = unlocked

Power-up default value:

Read/Write command byte:

* If the chip is shutdown when L3 is set, the chip will exit shutdown mode and resume normal operation. It will not be possible to subsequently

re-enter shutdown mode.