May 2006
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 signicant byte.
Bit
Function
Operation
D[7:0]
Low temperature limit for the remote zone, most signicant byte.
Read/write
Power-up default value:
0000 0000
b
= 00
h
(0癈)
Read/Write command byte:
0000 1000
b
= 08
h
Each LSB represents one degree centigrade. The values are in a twos complement binary format such that 0癈 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:
0000 0000
b
= 00
h
(All events unlocked)
Read/Write command byte:
0000 1001
b
= 09
h
* If the chip is ?/DIV>
re-enter shutdown mode.