参数资料
型号: MCP9800DM-DL
厂商: Microchip Technology
文件页数: 14/42页
文件大小: 0K
描述: BOARD DEMO FOR MCP9800
标准包装: 1
传感器类型: 温度
传感范围: -55°C ~ 125°C
接口: I²C,SM 总线
灵敏度: ±0.5°C
电源电压: 2.7 V ~ 5.5 V
嵌入式: 是,MCU,8 位
已供物品: 板,CD
已用 IC / 零件: MCP9800
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
the ALERT pin (refer to Section 5.3.4.3 “ALERT
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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