MIC3000 Datasheet, PDF (33/68 Pages) Micrel Semiconductor – SFP Management IC

MIC3000
Detailed Register Descriptions
Note: Serial bus addresses shown assume that I2CADR = Ax_h.
Micrel
Alarm Threshold Registers
D[7]
read/write
D[6]
read/write
Temperature High Alarm Threshold MSB (TMAXh)
D[5]
read/write
D[4]
read/write
D[3]
read/write
D[2]
read/write
D[1]
read/write
D[0]
read/write
Default Value
0000 0000_b = 00_h (0°C)
Serial Address
A2_h = 1010001_b
Byte Address
00 = 00_h
Each LSB represents one degree centigrade. This register is to be used in conjunction with TMAXl to yield a sixteen-
bit temperature value. The value in this register is uncalibrated. The value in TMAXh is compared against TEMPh.
Alarm bit Ax is set if TEMPh > TMAXh.
Temperature High Alarm Threshold LSB (TMAXh)
D[7]
read/write
D[6]
read/write
D[5]
read/write
D[4]
read/write
D[3]
read/write
D[2]
read/write
D[1]
read/write
D[0]
read/write
Default Value
0000 0000_b = 00_h (0°C)
Serial Address
A2_h = 1010001_b
Byte Address
01 = 01_h
This register is to be used in conjunction with TMAXh to yield a sixteen-bit temperature value. The value in TMAXh is
compared against TEMPh. Alarm bit Ax is set if TMAXh > TEMPh. Since TEMPl is always zero, it is recommended that
this register always be programmed to zero. This register is provided for compliance with SFF-8472. It is not used by
the MIC3000 when doing threshold comparisons and setting alarm or warning bits.
Temperature Low Alarm Threshold MSB (TMINh)
D[7]
read/write
D[6]
read/write
D[5]
read/write
D[4]
read/write
D[3]
read/write
D[2]
read/write
D[1]
read/write
D[0]
read/write
Default Value
0000 0000_b = 00_h (0°C)
Serial Address
A2_h = 1010001_b
Byte Address
02 = 02_h
Each LSB represents one degree centigrade. This register is to be used in conjunction with TMINl to yield a sixteen-bit
temperature value. The value in TMINh is compared against TEMPh. Alarm bit Ax is set if TEMPh < TMINh.
Temperature Low Alarm Threshold LSB (TMINl)
D[7]
read/write
D[6]
read/write
D[5]
read/write
D[4]
read/write
D[3]
read/write
D[2]
read/write
D[1]
read/write
D[0]
read/write
Default Value
0000 0000_b = 00_h (0°C)
Serial Address
A2_h = 1010001_b
Byte Address
03 = 03_h
This register is to be used in conjunction with TMINh to yield a sixteen-bit temperature value. The value in TMINh is
compared against TEMPh. Alarm bit Ax is set if TEMPh < TMINh. Since TEMPl is always zero, it is recommended that
this register always be programmed to zero. This register is provided for compliance with SFF-8472. It is not used by
the MIC3000 when doing threshold comparisons and setting alarm or warning bits.
October 2004
33
M9999-101204