MIC281-0YM6 查看數據表（PDF） - Micrel

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MIC281-0YM6

Two-Zone Thermal Supervisor Advance Information

Micrel 

MIC281

Slave Address

The MIC281 will only respond to its own unique slave ad-

dress. A match between the MIC281’s address and the

address specified in the serial bit stream must be made to

initiate communication. The MIC281’s slave address is fixed

at the time of manufacture. Eight different slave addresses

are available as determined by the part number. See Table

2 below and the Ordering Information table.

Part Number

Slave Address

MIC281-0BM6

1001 000xb = 90h

MIC281-1BM6

1001 001xb = 92h

MIC281-2BM6

1001 010xb = 94h

MIC281-3BM6

1001 011xb = 96h

MIC281-4BM6

1001 100xb = 98h

MIC281-5BM6

1001 101xb = 9Ah

MIC281-6BM6

1001 110xb = 9Ch

MIC281-7BM6

1001 111xb = 9Eh

Table 2. MIC281 Slave Addresses

Temperature Data Format

The least-significant bit of the temperature register represents

one degree Centigrade. The values are in a two’s comple-

ment format, wherein the most significant 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.

Micrel

Temperature

Binary

Hex

+127°C

0111 1111

7F

+125°C

0111 1101

7D

+25°C

0001 1001

19

+1°C

0000 0001

01

0°C

0000 0000

00

–1°C

1111 1111

FF

–25°C

1110 0111

E7

–125°C

1000 0011

83

–128°C

1000 0000

80

Table 3. Digital Temperature Format

Diode Faults

The MIC281 is designed to respond in a failsafe manner to

diode faults. If an internal or external fault occurs in the tem-

perature 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, +127°C. Note that diode faults will

not be detected until the first A/D conversion cycle is completed

following power-up or exiting shutdown mode.

Shutdown Mode

Setting the shutdown bit in the configuration register will

cause the MIC281 to cease operation. The A/D converter will

stop and power consumption will drop to the ISHDN level. No

registers will be affected by entering shutdown mode. The

last temperature reading will persist in the TEMP register.

November 2004

7

MIC281

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