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參數(shù)資料
| 型號： | MIC184 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Local/Remote Thermal Supervisor Advance Information |
| 中文描述： | 本地/遠程熱監(jiān)進展信息 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 140K |
| 代理商： | MIC184 |
MIC184
Micrel
MIC184
10
November 2000
to be read from the MIC184 may then be clocked out. There
is one exception 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 MIC184
’
s 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,
communications 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 physically
two bytes (one SMBus word) wide within the MIC184. Prop-
erly 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
°
C. The
values are in a two
’
s complement format, wherein the most
significant bit (D8) represents the sign:
“
0
”
for positive tem-
peratures and
“
1
”
for negative temperatures. The seven least
significant bits of each 16-bit physical register are undefined.
Therefore, physical bits D6 through D0 of the data read from
these registers must be masked off, and the resulting binary
value right justified before using the data received. It is also
possible to read only the first byte of any of these three
registers, sacrificing 0.5
°
C 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 continu-
ous 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 conver-
sions. This allows the use of a filter 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 MIC184
’
s internal regis-
ters are set to default states which make the MIC184 com-
pletely backward compatible with the LM75. Also at this time,
the levels on the address inputs A2, A1, and A0 are read to
establish the device
’
s slave address. The MIC184
’
s 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
°
C; T_HYST = +75
°
C
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
≈
25
μ
A 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 temperature
sensor (if used) may not be reported until one or more
conversion cycles have been completed following power-on.
See DIODE FAULTS.
e
r
u
t
r
e
p
m
e
T
y
r
a
n
B
w
a
R
y
r
a
n
B
d
e
k
s
a
M
x
e
H
d
e
k
s
a
M
C
C
C
°
5
5
2
2
5
+
0
5
–
2
–
4
–
5
–
1
+
+
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
0
1
0
0
0
1
1
0
0
1
1
0
1
0
0
0
0
1
1
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
1
1
1
0
0
1
0
1
0
1
0
0
0
1
1
0
0
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
0
1
0
0
0
1
1
0
0
1
1
0
1
0
0
0
0
1
1
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
1
1
1
0
0
1
0
1
0
1
0
0
0
1
1
0
0
1
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
b
A
2
1
0
F
E
0
2
F
3
0
0
F
C
B
9
0
0
0
0
1
1
1
1
h
°
°
C
°
°
°
°
b
h
b
h
°
b
h
C
C
C
C
b
h
5
0
5
b
h
b
h
b
h
Table 3. Digital Temperature Format
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC184_06 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Local/Remote Thermal Supervisor |
| MIC184BM | 功能描述:IC SUPERVISOR LOCAL/REMOTE 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)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），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| MIC184BM TR | 功能描述:IC SUPERVISOR LOCAL/REMOTE 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)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），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| MIC184BMM | 功能描述:IC SUPERVISOR LOCAL/REMOTE 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)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），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| MIC184BMM TR | 功能描述:IC SUPERVISOR LOCAL/REMOTE 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)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），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
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