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參數資料
| 型號： | ADT6402SRJZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 9/12頁 |
| 文件大小： | 264K |
| 描述： | IC TEMP SENS TRIP PT PP SOT-23-6 |
| 產品培訓模塊： | Temperature Sensors |
| 特色產品： | ADT6401 and ADT6402 Temperature Switches |
| 標準包裝： | 1 |
| 功能： | 溫度開關 |
| 傳感器類型： | 內部 |
| 感應溫度： | -45°C ~ 5°C，45°C ~ 115°C |
| 精確度： | ±0.5°C |
| 拓撲： | ADC（三角積分型），比較器 |
| 輸出類型： | 推挽式 |
| 輸出警報： | 是 |
| 輸出風扇： | 是 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應商設備封裝： | SOT-23-6 |
| 包裝： | 標準包裝 |
| 產品目錄頁面： | 798 (CN2011-ZH PDF) |
| 其它名稱： | ADT6402SRJZ-RL7DKR |
Data Sheet
ADT6401/ADT6402
Rev. C | Page 9 of 12
THEORY OF OPERATION
CIRCUIT INFORMATION
The ADT6401/ADT6402 are 11-bit digital temperature sensors
with a 12
th
bit acting as the sign bit. An on-board temperature
sensor generates a voltage precisely proportional to absolute
temperature, which is compared to an internal voltage reference
and input to a precision digital modulator. The 12-bit output
from the modulator is input into a digital comparator, where it
is compared with a pin-selectable trip level. The output trip pin
is activated if the temperature measured is greater than, or less
than, the pin-selectable trip level. Overall accuracy for the
ADT6401/ ADT6402 is ?癈 (maximum) from 45癈 to
+115癈.
The on-board temperature sensor has excellent accuracy and
linearity over the entire rated temperature range without needing
correction or calibration by the user. The ADT6401 has active
low, open-drain output structures that can sink current. The
ADT6402 has active high, push-pull output structures that can
sink and source current. On power-up, the output becomes
active when the first conversion is completed, which typically
takes 30 ms.
The sensor output is digitized by a first-order, - modulator,
also known as the charge balance type analog-to-digital converter
(ADC). This type of converter utilizes time domain oversampling
and a high accuracy comparator to deliver 11 bits of effective
accuracy in an extremely compact circuit.
CONVERTER DETAILS
The ??modulator consists of an input sampler, a summing
network, an integrator, a comparator, and a 1-bit digital-to-
analog converter (DAC). Similar to the voltage-to-frequency
converter, this architecture creates a negative feedback loop and
minimizes the integrator output by changing the duty cycle of
the comparator output in response to input voltage changes.
The comparator samples the output of the integrator at a much
higher rate than the input sampling frequency; this is called
oversampling. Oversampling spreads the quantization noise
over a much wider band than that of the input signal, improving
overall noise performance and increasing accuracy.
PIN-SELECTABLE TRIP POINT AND HYSTERESIS
The temperature trip point and hysteresis values for the
ADT6401/ADT6402 are selected using Pin S0, Pin S1, and
Pin S2. These three pins can be connected to V
CC
, tied to GND,
or left floating. The ADT6401/ADT6402 decode the inputs on
S0, S1, and S2 to determine the temperature trip point and
hysteresis value, as outlined in Table 4.
The ADT6401 overtemperature/undertemperature output is
intended to interface to reset inputs of microprocessors. The
ADT6402 is intended for driving circuits of applications, such
as fan control circuits.
Table 4. Selecting Trip Points and Hysteresis
1
S2
S1
S0
Temperature
Trip Point
Hysteresis
0
0
0
+45癈
2癈
0
0
1
+55癈
2癈
0
0
Float
+65癈
2癈
0
1
0
+75癈
2癈
0
1
1
+85癈
2癈
0
1
Float
+95癈
2癈
0
Float
0
+105癈
2癈
0
Float
1
+115癈
2癈
0
Float
Float
+55癈
10癈
1
0
0
+65癈
10癈
1
0
1
+75癈
10癈
1
0
Float
+85癈
10癈
1
1
0
+95癈
10癈
1
1
1
+105癈
10癈
1
1
Float
+115癈
10癈
1
Float
0
+5癈
2癈
1
Float
1
5癈
2癈
1
Float
Float
15癈
2癈
Float
0
0
25癈
2癈
Float
0
1
35癈
2癈
Float
0
Float
45癈
2癈
Float
1
0
+5癈
10癈
Float
1
1
5癈
10癈
Float
1
Float
15癈
10癈
Float
Float
0
25癈
10癈
Float
Float
1
35癈
10癈
Float
Float
Float
45癈
10癈
1
0 = pin tied to GND, 1 = pin tied to VCC, Float = pin left floating.
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| ADT6501 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, 2.7 V to 5.5 V, Micropower Temperature Switches in SOT-23 |
| ADT6501ARJP035 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, 2.7 V to 5.5 V, Micropower Temperature Switches in SOT-23 |
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| ADT6501ARJP055 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, 2.7 V to 5.5 V, Micropower Temperature Switches in SOT-23 |
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