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| 型号： | MIC384-2YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/22页 |
| 文件大小： | 510K |
| 描述： | IC SUPERVSR THERM LOC/REM 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： | MIC384-2YMTR MIC384-2YMTR-ND |
MIC384
Micrel
MIC384
10
September 2005
Temperature Data Format
The LSB of each register represents one degree Centigrade.
The values are in a twos complement format, wherein the
most signicant bit (D7) represents the sign: zero for posi-
tive temperatures and one for negative temperatures. Table
3 shows examples of the data format used by the MIC384
for temperatures.
A/D Converter Timing
Whenever the MIC384 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 access-
ing the MIC384.
Upon powering up or coming out of shutdown mode, the ADC
will begin acquiring temperature data starting with the rst
external zone, zone 1, then the second external zone, zone
2, and nally the internal zone, zone 0. Results for zone 1 will
be valid after t
CONV1
, results for zone two will be ready after
another t
CONV1
, and for the local zone t
CONV0
later. Figure
4 shows this behavior. The conversion time is twice as long
for external conversions as it is for internal conversions. This
allws the use of a lter capacitor on T1 and/or T2 without a
loss of accuracy due to the resulting longer settling times.
Upon powering up, coming out of shutdown mode, or resum-
ing operation following a serial bus transaction, the ADC will
begin aquiring temperature data with the rst external zone
(zone 1), followed by the second external zone (zone 2), and
then the internal zone (zone 0). If the ADC in interrupted by a
serial bus transaction, it will restart the conversion that was
interrupted and then continue in the normal sequence. This
sequence will repeat indenitely until the MIC384 is shut
down, powered off, or is interrupted by a serial bus transac-
tion as described above.
Power On
When power is initially applied, the MIC384s internal registers
are set to their default states. Also at this time, the level on
the address input, A0, is read to establish the devices slave
address. The MIC384s power-up default state can be sum-
marized as follows:
" Normal mode operation (i.e., part is not in shut-
down)
" /INT function is set to comparator mode
" Fault queue depth = 1 (FQ=00)
" Interrupts are enabled (IM = 0)
" T_SET0 = 81癈; T_HYST0 = 76癈
" T_SET1 = 97癈; T_HYST1 = 92癈
" T_SET2 = 97癈; T_HYST2 = 92癈
" Initialized to recognize overtemperature faults
Comparator and Interrupt Modes
Depending on the setting of the MODE bit in the congura-
tion register, the /INT output will behave either as an interrupt
request signal or a thermostatic control signal. Thermostatic
operation is known as comparator mode. The /INT output is
asserted when the measured temperature, as reported in any
of the TEMPx registers, exceeds the threshold programmed
into the corresponding T_SETx register for the number of
conversions specied by Fault_Queue (described below).
In comparator mode, /INT will remain asserted and the
status bit(s) will remain high unless and until the measured
temperature falls below the value in the T_HYSTx register
for Fault_Queue conversions. No action on the part of the
host is required for operation in comparator mode. Note that
entering shutdown mode will not affect the state of /INT when
the device is in comparator mode.
In interrupt mode, once a temperature event has caused a
status bit to be set and the /INT output to be asserted, they
will not be automatically de-asserted when the measured
temperature falls below T_HYSTx. They can only be de-as-
serted by reading any of the MIC384s internal registers or
by putting the device into shutdown mode. If the most recent
temperature event was an overtemperature condition, Sx will
not be set again, and /INT cannot be reasserted, until the
device has detected that TEMPx < T_HYSTx. Similarly, if
the most recent temperature event was an undertemperature
condition, Sx will not be set again, and /INT cannot be reas-
serted, until the device has detected that TEMPx > T_SETx.
This keeps the internal logic of the MIC384 backward compat-
ible with that of the LM75 and similar devices. In both modes,
the MIC384 will be responsive to over-temperature events at
power-up. See "Interrupt Generation", below.
Shutdown Mode
Setting the SHDN bit in the conguration register halts the
otherwise continuous conversions by the A/D converter. The
MIC384s power consumption drops to 1礎 typical in shutdown
mode. All registers may be read from or written to while in
shutdown mode. Serial bus activity will slightly increase the
parts power consumption.
Entering shutdown mode will not affect the state of /INT
when the device is in comparator mode (MODE = 0). It will
retain its state until after the device exits shutdown mode and
resumes A/D conversions.
However, if the device is shut down while in interrupt mode,
the /INT pin will be unconditionally de-asserted and the internal
latches holding the interrupt status will be cleared. There-
fore, no interrupts will be generated while the MIC384 is in
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