icrel, Inc.
MIC281
pril 23, 2014
8
Revision 2.0
Slave Address
The MIC281 will only respond to its own unique slave address. A match between the MIC281s address and the address
specied in the serial bit stream must be made to initiate communication. The MIC281s slave address is xed at the time
of manufacture. Eight different slave addresses are available as determined by the part number. See Table 2 and the
Ordering Information table.
Table 2. MIC281 Slave Addresses
Part Number
Slave Address
MIC281-0YM6
1001 000
b
= 90
h
MIC281-1YM6
1001 001
b
= 92
h
MIC281-2YM6
1001 010
b
= 94
h
MIC281-3YM6
1001 011
b
= 96
h
MIC281-4YM6
1001 100
b
= 98
h
MIC281-5YM6
1001 101
b
= 9A
h
MIC281-6YM6
1001 110
b
= 9C
h
MIC281-7YM6
1001 111
b
= 9E
h
Temperature Data Format
The least-signicant bit of the temperature register represents one degree Centigrade. The values are in a twos
complement format, wherein the most signicant bit (D7) represents the sign: zero for positive temperatures and one for
negative temperatures. Table 3 shows examples of the data format used by the MIC281 for temperatures.
Table 3. Digital Temperature Format
Temperature
Binary
Hex
+127癈
0111 1111
7F
+125癈
0111 1101
7D
+25癈
0001 1001
19
+1癈
0000 0001
01
0癈
0000 0000
00
1癈
1111 1111
FF
25癈
1110 0111
E7
125癈
1000 0011
83
128癈
1000 0000
80
Diode Faults
The MIC281 is designed to respond in a failsafe manner to diode faults. If an internal or external fault occurs in the
temperature sensing circuitry, such as T1 being open or shorted to VDD or GND, the temperature result will be reported
as the maximum full-scale value of +127癈. Note that diode faults will not be detected until the rst A/D conversion cycle
is completed following power-up or exiting shutdown mode.
Shutdown Mode
Setting the shutdown bit in the conguration register will cause the MIC281 to cease operation. The A/D converter will
stop and power consumption will drop to the I
SHDN
level. No registers will be affected by entering shutdown mode. The last
temperature reading will persist in the TEMP register.
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