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參數(shù)資料
| 型號： | MIC184BM |
| 廠商： | MICREL INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Local/Remote Thermal Supervisor Advance Information |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 140K |
| 代理商： | MIC184BM |
MIC184
Micrel
MIC184
12
November 2000
servicing interrupts for the host to read the current tempera-
ture to confirm that the condition that caused the interrupt still
exists.
Interrupt Polarity Selection
The INT output can be programmed to behave as an active-
low signal or an active-high signal. The default is active-low.
INT polarity is selected by programming the appropriate
value into the polarity bit (POL) in the CONFIG register.
Clearing POL selects active-low interrupts; setting POL se-
lects active-high interrupts. INT is an open-drain digital output
and may be wire-ORed with other open-drain logic signals.
Most applications will require a pull-up resistor on this pin.
Whether the CONFIG register
’
s POL bit is set to provide a
current-sinking (low) or high-Z (high) state at the INT pin
when STS is high, writing a one to IM will put the INT pin into
a high-Z state. This meets the requirement of an active-low
interrupt for the SMBus, while making IM available as an INT-
forcing bit for those applications which employ an active-high
INT output (for example, software fan-control routines).
LM75 Compatibility
The MIC184 can be used interchangeably with the LM75 in
existing applications. The MIC184 offers several advantages
over the LM75:
Ability to monitor a second, remote temperature
Interrupt masking capability
Status bit for software polling routines
Lower quiescent current
Supports single-byte reads from 16-bit registers
No
“
inadvertent 8-bit read
”
bus lock-up issues
The three MSB
’
s of the configuration register (which power
up as zeroes) are used to access the MIC184
’
s additional
functions. These are reserved bits according to the LM75
specification and, for the LM75, must always be written as
zeroes. The MSB of the MIC184
’
s status register is a status
flag that does not exist in the LM75. This bit will be set to one
whenever an overtemperature event occurs. This bit would
never be set by an LM75. Software should not depend on this
bit being zero when using the MIC184 as an LM75 upgrade.
If at power-up the measured temperature is higher than
T_SET, the status bit will be set following the first conversion
by the A/D. See
“
Applications Information
”
for a method by
which host software can use this fact to differentiate between
an MIC184 and an LM75.
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