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| 型号： | MCP9802A5T-M/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 14/42页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SNSR 12BIT 2WIRE SOT23-5 |
| 标准包装： | 1 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±2°C（最小值） |
| 拓扑： | ADC（三角积分型），寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 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： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 683 (CN2011-ZH PDF) |
| 其它名称： | MCP9802A5T-M/OTDKR |
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MCP9800/1/2/3
5.3
Registers
The MCP9800/1/2/3 has four registers that are
user-accessible. These registers are specified as the
Ambient Temperature (T A ) register, the Temperature
Limit-set (T SET ) register, the Temperature Hysteresis
(T HYST ) register and device Configuration (CONFIG)
register.
The Ambient Temperature register is a read-only
register and is used to access the ambient temperature
data. The data from the ADC is loaded in parallel in the
Resolution
One-Shot
Shutdown
Fault Queue
Alert Polarity
Alert Comp/Int
register. The Temperature Limit-set and Temperature
Hysteresis registers are read/write registers that
provide user-programmable temperature limits. If the
ambient temperature drifts beyond the programmed
limits, the MCP9800/1/2/3 outputs an alert signal using
Output Configuration” ). The device Configuration
register provides access for the user to configure the
MCP9800/1/2/3’s various features. These registers are
described in further detail in the following sections.
The registers are accessed by sending Register Point-
ers to the MCP9800/1/2/3 using the serial interface.
This is an 8-bit pointer. However, the two Least
Significant bits (LSbs) are used as pointers and all
other bits need to be cleared < 0 >. This device has addi-
tional registers that are reserved for test and
calibration. If these registers are accessed, the device
may not perform according to the specification. The
pointer description is shown below.
REGISTER 5-1:
REGISTER POINTER
Configuration
Register
Temperature
Register
T HYST
Register
T SET
Register
FIGURE 5-2:
ALERT
Output
ALERT Output
Control Logic
Register Block Diagram.
U-0
0
U-0
0
U-0
0
U-0
0
U-0
0
U-0
0
R/W-0
P1
R/W-0
P0
bit 7
Legend:
bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-2
bit 1-0
Unimplemented: Read as ‘ 0 ’
Px<1:0>: Pointer bits
00 = Temperature register (T A )
01 = Configuration register (CONFIG)
10 = Temperature Hysteresis register (T HYST )
11 = Temperature Limit-set register (T SET )
.
DS21909D-page 14
? 2010 Microchip Technology Inc.
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