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| 型號： | MCP9803-M/MSG |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 3Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, MO-187, MSOP-8 |
| 文件頁數(shù)： | 6/30頁 |
| 文件大?。?/td> | 478K |
| 代理商： | MCP9803-M/MSG |
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MCP9800/1/2/3
DS21909B-page 14
2004 Microchip Technology Inc.
4.3.4.1
Shutdown Mode
The Shutdown mode disables all power-consuming
activities (including temperature sampling operations)
while leaving the serial interface active. The device
consumes 1 A (max.) in this mode. It remains in this
mode until the configuration register is updated to
enable continuous conversion or until power is
recycled.
In Shutdown mode, the CONFIG, TA, TSET and THYST
registers can be read or written. However, the serial
bus activity will increase the shutdown current.
4.3.4.2
One-Shot Mode
The MCP9800/1/2/3 can also be used in a One-shot
mode that can be selected using bit 7 of the CONFIG
register. The One-shot mode performs a single temper-
ature measurement and returns to Shutdown mode.
This mode is especially useful for low-power applica-
tions where temperature is measured upon command
from a controller. For example, a 9-bit TA in One-shot
mode consumes 200 A (typ.) for 30 ms and 0.1 A
(typ.) during shutdown.
To access this feature, the device needs to initially be
in Shutdown mode. This is done by sending a byte to
the CONFIG register with bit 0 set <1> and bit 7
cleared <0>. Once the device is in Shutdown mode,
CONFIG needs to be written again with bit 0 and bit 7
set <1>. This begins the single conversion cycle of
30 ms for
9-bit data.
Once
the conversion is
completed, TA is updated and bit 7 of CONFIG
becomes cleared <0> by the MCP9800/1/2/3.
TABLE 4-6:
SHUTDOWN AND ONE-SHOT
MODE DESCRIPTION
4.3.4.3
ALERT Output Configuration
The ALERT output can be configured as either a
comparator output or as Interrupt Output mode using
bit 1 of CONFIG. The polarity can also be specified as
an active-high or active-low, using bit 2 of CONFIG.
The following sections describe each Output mode
and Figure 4-2 shows graphical description.
4.3.4.4
Comparator Mode
In the Comparator mode, the ALERT output is asserted
when TA is greater than TSET. The pin remains active
until TA is lower than THYST. The Comparator mode is
useful for thermostat-type applications such as turning
on a cooling fan or triggering a system shutdown when
the temperature exceeds a safe operating range.
In the Comparator mode, if the device enters the
Shutdown mode with asserted ALERT output, the
output remains active during shutdown. The device
must be operating in continuous conversion, with TA
below THYST, for the ALERT output to be deasserted.
4.3.4.5
Interrupt Mode
In the Interrupt mode, the ALERT output is asserted
when TA is greater than TSET. However, the output is
deasserted when the user performs a read from any
register. This mode is designed for interrupt driven micro-
controller based systems. The microcontroller receiving
the interrupt will have to acknowledge the interrupt by
reading any register from the MCP9800/1/2/3. This will
clear the interrupt and the ALERT pin will become
deasserted. When TA drifts below THYST, the MCP9800/
1/2/3 outputs another interrupt and the controller needs
to read a register to deassert the ALERT output. Shutting
down the device will also reset or deassert the ALERT
output.
FIGURE 4-2:
Alert Output.
Operational Mode
One-Shot
(Bit 7)
Shutdown
(Bit 0)
Continuous Conversion
00
Shutdown
01
Continuous Conversion
(One-shot is ignored)
10
One-Shot
11
Note:
The shutdown command <01> needs to
be programmed before sending a one-
shot command <11>.
TSET
THYST
ALERT
Comparator Mode
Interrupt Mode
Active-Low
T
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