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MIC184

Micrel

MIC184

10

May 2006

the MIC184 may then be clocked out. There is one excep-

tion to this rule: If the location latched in the pointer register

from the last write operation is known to be correct (i.e.,

points to the desired register), then the RECEIVE_DATA

procedure may be used. To perform a RECEIVE_DATA, the

host sends an address byte to select the slave MIC184, and

then retrieves the appropriate number (one or two) of data

bytes. Figures 1 through 5 show the formats for these data

read and data write procedures.

The command byte is 8 bits (1 byte) wide. This byte carries

the address of the MIC184 register to be operated upon, and

is stored in the MIC184s pointer register. The pointer register

is a write-only register, which is implemented for backward

compatibility to the National Semiconductor LM75 and similar

devices. The command byte (pointer register) values corre-

sponding to the various MIC184 register addresses are shown

in Table 2. Command byte values other than 0000 00XX

b

=

00

h

through 03

h

are reserved, and should not be used.

The CONFIG register is 8 bits (1 byte) wide. Therefore, com-

munications with the CONFIG register will at a minimum require

a READ_BYTE, WRITE_BYTE, or a RECEIVE_BYTE.

The TEMP, T_HYST, and T_SET registers are logically

nine bits wide. Note, though, that these registers are physi-

cally two bytes (one SMBus word) wide within the MIC184.

Properly communicating with the MIC184 involves a 16-bit

READ_WORD or RECEIVE_WORD from, or WRITE_WORD

to, these registers. This is a requirement of the I

2

C/SMBus

serial data protocols, which only allow data transfers to occur

in multiples of eight bits.

Temperature Data Format

The LSB of each 9-bit logical register represents 0.5癈. The

values are in a twos complement format, wherein the most

signicant bit (D8) represents the sign: 0 for positive tem-

peratures and 1 for negative temperatures. The seven least

signicant bits of each 16-bit physical register are undened.

Therefore, physical bits D6 through D0 of the data read

from these registers must be masked off, and the resulting

binary value right justied before using the data received.

It is also possible to read only the rst byte of any of these

three registers, sacricing 0.5癈 of resolution in exchange

for somewhat simpler data handling. However, all writes

to the T_SET and T_HYST registers must be in the 16-bit

WRITE_WORD format. Table 3 shows examples of the data

format used by the MIC184 for temperatures.

A/D Converter Timing

Whenever the MIC184 is not in its low power shutdown mode,

the internal A/D converter (ADC) attempts to make continuous

conversions unless interrupted by a bus transaction accessing

the MIC184. When the MIC184 is accessed, the conversion

in progress will be halted, and the partial result discarded.

When the access of the MIC184 is complete the ADC will

begin a new conversion cycle, with results valid t

CONV

after

that. Figure 6 shows this behavior. t

CONV

is twice as long for

external conversions as it is for internal conversions. This al-

lows the use of a lter capacitor on the A2/T1 input without a

loss of accuracy due to the resulting longer settling times.

Power-On

When power is initially applied, the MIC184s internal registers

are set to default states which make the MIC184 completely

backward compatible with the LM75. Also at this time, the

levels on the address inputs A2, A1, and A0 are read to es-

tablish the devices slave address. The MIC184s power-up

default state can be summarized as follows:

" Normal-mode operation

(MIC184 not in shutdown)

" ZONE is set to internal

(on-chip temperature sensing)

" INT function is set to comparator mode

" INT output is set to active-low operation

" Fault_Queue depth = 1

" Interrupts are enabled (IM = 0)

" T_SET = +80癈; T_HYST = +75癈

In order to accommodate the use of A2/T1 as a dual-purpose

input, there is a weak pulldown on A2/T1 that will attempt to

sink H25礎 from the pin to ground for t

POR

following power-

up of the MIC184. This allows the MIC184 to pull A2/T1 to a

low state when a diode junction is connected from that pin

to ground, and latch a zero as the A2 address value. If A2 is

not to be used as a diode connection, it should be connected

to V

DD

or ground. Note that a fault in the external tempera-

ture sensor (if used) may not be reported until one or more

conversion cycles have been completed following power-on.

See DIODE FAULTS.

Shutdown Mode

Setting the SHDN bit in the conguration register halts the

otherwise continuous conversions by the A/D converter. The

e

r

u

t

a

r

e

p

m

e

T

y

r

a

n

i

B

w

a

R

y

r

a

n

i

B

d

e

k

s

a

M

x

e

H

d

e

k

s

a

M

C

?/DIV>

5

2

1

+

X

0

1

0

1

0

1

0

1

0

b

A

F

0

h

C

?/DIV>

5

2

+

X

0

1

0

1

0

1

0

1

0

b

2

3

0

h

C

?/DIV>

5

.

0

+

X

1

0

1

0

b

1

0

h

C

?/DIV>

0

X

0

b

0

h

C

?/DIV>

5

.

0

X

1

b

F

1

h

C

?/DIV>

5

2

X

0

1

0

1

0

1

0

1

b

E

C

1

h

C

?/DIV>

0

4

X

0

1

0

1

0

1

0

1

b

0

B

1

h

C

?/DIV>

5

X

0

1

0

1

0

1

0

1

0

1

0

1

b

2

9

1

h

Table 3. Digital Temperature Format

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相關代理商/技術參數	參數描述
MIC184YM	功能描述:板上安裝溫度傳感器 Improved LM75 Series Local/Remote Temperature Sensor in SOIC-8 Lead-Free RoHS:否制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
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型號：	MIC184BM TR
廠商：	Micrel Inc
文件頁數：	10/20頁
文件大小：	483K
描述：	IC SUPERVISOR LOCAL/REMOTE 8SOIC
標準包裝：	2,500
功能：	溫度監控系統（傳感器）
傳感器類型：	內部和外部
感應溫度：	-55°C ~ 125°C，外部傳感器
精確度：	±2°C 本地（最大），±3°C 遠程（最大）
拓撲：	ADC（三角積分型），寄存器庫
輸出類型：	I²C?/SMBus?
輸出警報：	是
輸出風扇：	無
電源電壓：	2.7 V ~ 5.5 V
工作溫度：	-55°C ~ 125°C
安裝類型：	表面貼裝
封裝/外殼：	8-SOIC（0.154"，3.90mm 寬）
供應商設備封裝：	8-SOIC
包裝：	帶卷 (TR)
其它名稱：	MIC184BMTR MIC184BMTR-ND

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