- 您现在的位置：买卖IC网 > PDF目录19478 > MIC184YM TR (Micrel Inc)IC SUPERVISOR LOCAL/REMOTE 8SOIC PDF资料下载
参数资料
| 型号： | MIC184YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 483K |
| 描述： | IC SUPERVISOR LOCAL/REMOTE 8SOIC |
| 标准包装： | 2,500 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | -55°C ~ 125°C，外部传感器 |
| 精确度： | ±2°C 本地（最大），±3°C 远程（最大） |
| 拓扑： | ADC（三角积分型），寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC184YMTR MIC184YMTR-ND |
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
X
X
X
X
X
X
0
1
0
1
1
1
1
1
0
0
1
0
1
1
1
1
1
0
b
A
F
0
h
C
?/DIV>
5
2
+
X
X
X
X
X
X
X
0
1
0
0
1
1
0
0
0
0
1
0
0
1
1
0
0
0
b
2
3
0
h
C
?/DIV>
5
.
0
+
X
X
X
X
X
X
X
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
b
1
0
0
h
C
?/DIV>
0
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
b
0
0
0
h
C
?/DIV>
5
.
0
X
X
X
X
X
X
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
b
F
F
1
h
C
?/DIV>
5
2
X
X
X
X
X
X
X
0
1
1
1
0
0
1
1
1
0
1
1
1
0
0
1
1
1
b
E
C
1
h
C
?/DIV>
0
4
X
X
X
X
X
X
X
0
0
0
0
1
1
0
1
1
0
0
0
0
1
1
0
1
1
b
0
B
1
h
C
?/DIV>
5
5
X
X
X
X
X
X
X
0
1
0
0
1
0
0
1
1
0
1
0
0
1
0
0
1
1
b
2
9
1
h
Table 3. Digital Temperature Format
相关PDF资料 |
PDF描述 |
|---|---|
| 171-009-203L021 | CONN DB9 FEMALE SLD CUP NICKEL |
| V72A3V3E264BG3 | CONVERTER MOD DC/DC 3.3V 264W |
| T491D226M035AT | CAP TANT 22UF 35V 20% 2917 |
| 171-009-102L021 | CONN DB9 MALE SOLDER CUP TIN |
| V72A3V3E264BF2 | CONVERTER MOD DC/DC 3.3V 264W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC196 | 制造商:American DJ 功能描述:Laser Light Effect DMX Red Green and Blue Laser |
| MIC1R | 制造商:Velleman Inc 功能描述: |
| MIC1S | 制造商:Bogen Communications 功能描述:Module, Input;Screw;For amplifier, mic input, transformer balanced |
| MIC1X | 制造商:Bogen Communications 功能描述:Microphone Module M-Series 制造商:Bogen Communications 功能描述:AUDIO VISUAL INPUT MODULES; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No ;RoHS Compliant: No |
| MIC-2 | 功能描述:保险丝 250VAC 2A Fast Acting Indicating RoHS:否 制造商:Littelfuse 产品:Surface Mount Fuses 电流额定值:0.5 A 电压额定值:600 V 保险丝类型:Fast Acting 保险丝大小/组:Nano 尺寸:12.1 mm L x 4.5 mm W 安装风格: 端接类型:SMD/SMT 系列:485 |
发布紧急采购，3分钟左右您将得到回复。