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| 型号： | MCP9802A5T-M/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 25/42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
5.3.4.6
Fault Queue
5.4
Summary of Power-up Condition
The fault queue feature can be used as a filter to lessen
the probability of spurious activation of the ALERT pin.
T A must remain above T SET for the consecutive
number of conversion cycles selected using the Fault
Queue bits. Bit 3 and bit 4 of CONFIG can be used to
select up to six fault queue cycles. For example, if six
The MCP9800/1/2/3 has an internal Power-on Reset
(POR) circuit. If the power supply voltage V DD glitches
down to the 1.7V (typical) threshold, the device resets
the registers to the power-up default settings.
Power-up Defaults
fault queues are selected, T A must be greater than
T SET for six consecutive conversions before ALERT is
asserted as a comparator or an interrupt output.
This queue setting also applies for T HYST . I f six fault
queues are selected, T A must remain below T HYST for
six consecutive conversions before ALERT is
deasserted (Comparator mode) or before another
interrupt is asserted (Interrupt mode).
TABLE 5-4:
Register
T A
T SET
T HYST
Pointer
POWER-UP DEFAULTS
Data
(Hex)
0000 0°C
A000 80°C
9600 75°C
00 Temperature register
5.3.4.7
?? ADC Resolution
Continuous Conversion
The MCP9800/1/2/3 provides access to select the ADC
resolution from 9-bit to 12-bit (0.5°C to 0.0625°C
resolution) using bit 6 and bit 5 of the CONFIG register.
The user can gain better insight into the trends and
CONFIG
00
Comparator mode
Active-low Output
Fault Queue 1
9-bit Resolution
characteristics of the ambient temperature by using a
finer resolution. Increasing the resolution also reduces
the quantization error. Figure 2-3 shows accuracy
versus resolution.
corresponding resolution.
At power-up, the MCP9800/1/2/3 has an inherent 2 ms
(typical) power-up delay before updating the registers
with default values and start a conversion cycle. This
delay reduces register corruption due to unsettled
power. After power-up, it takes t CONV for the TCN75A
to update the T A register with valid temperature data.
TABLE 5-3:
RESOLUTION AND
CONVERSION TIME
Bits
9
10
11
12
Resolution
0.5
0.25
0.125
0.0625
t CONV (typical)
30 ms
60 ms
120 ms
240 ms
? 2010 Microchip Technology Inc.
DS21909D-page 25
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