MIC280-7BM6 TR【PDF 7/23 页】IC SUPERVISOR THERMAL SOT23-6

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Sheet目录45

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May 2006

MIC280

Micrel

Functional Description

Serial Port Operation

The MIC280 uses standard SMBus Write_Byte, Read_Byte,

and Read_Word operations for communication with its host.

The SMBus Write_Byte operation involves sending the

devices slave address (with the R/W bit low to signal a write

operation), followed by a command byte and the data byte.

The SMBus Read_Byte operation is a composite write and

read operation: the host rst sends the devices slave address

followed by the command byte, as in a write operation. A

new start bit must then be sent to the MIC280, followed by a

repeat of the slave address with the R/W bit (LSB) set to the

high (read) state. The data to be read from the part may then

be clocked out. A Read_Word is similar, but two successive

data bytes are clocked out rather than one. These protocols

are shown in Figure 1, Figure 2, and Figure 3.

The Command byte is eight bits (one byte) wide. This byte

carries the address of the MIC280 register to be operated

upon. The command byte values corresponding to the vari-

ous MIC280 registers are shown in Table 1. Other command

byte values are reserved, and should not be used.

Slave Address

The MIC280 will only respond to its own unique slave ad-

dress. A match between the MIC280s address and the

address specied in the serial bit stream must be made to

initiate communication. The MIC280s slave address is xed

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 above.

Part Number

Slave Address

MIC280-0BM6

100 1000

= 48

MIC280-1BM6

100 1001

= 49

MIC280-2BM6

100 1010

= 4A

MIC280-3BM6

100 1011

= 4B

MIC280-4BM6

100 1100

= 4C

MIC280-5BM6

100 1101

= 4D

MIC280-6BM6

100 1110

= 4E

MIC280-7BM6

100 1111

= 4F

Table 2: MIC280 Slave Addresses

Alert Response Address

In addition to the Read_Byte, Write_Byte, and Read_Word

protocols, the MIC280 adheres to the SMBus protocol for

response to the Alert Response Address (ARA). The MIC280

expects to be interrogated using the ARA when it has as-

serted its /INT output.

Temperature Data Format

The least-signicant bit of each temperature register (high

bytes) represents one degree Centigrade. The values are in

a twos complement format, wherein the most signicant bit

Command Byte

Power-on

Target Register

Value

Default

Label

Description

Read

Write

TEMP0

Local temperature result

n/a

(0癈)

TEMP1h

Remote temperature result, high byte

n/a

(0癈)

STATUS

Status

n/a

CONFIG

Conguration

IMASK

Interrupt mask register

THIGH0

Local temperature high limit

(60癈)

TLOW0

Local temperature low limit

(0癈)

THIGH1h

Remote temperature high limit, high byte

(80癈)

TLOW1h

Remote temperature low limit, high byte

(0癈)

LOCK

Security register

TEMP1l

Remote temperature result, low byte

n/a

THIGH1l

Remote temperature high limit, low byte

TLOW1l

Remote temperature low limit, low byte

CRIT1

Remote over-temperature limit

(100癈)

CRIT0

Local over-temperature limit

(70癈)

MFG_ID

Manufacturer Identication

n/a

DEV_ID

Device and revision identication

n/a

* The lower nibble contains the die revision level, e.g., Rev 0 = 00h.

Table 1: MIC280 Register Addresses

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