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參數(shù)資料
| 型號(hào)： | ADT7476ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | ROHS COMPLIANT, MO-137AE, QSOP-24 |
| 文件頁數(shù)： | 9/72頁 |
| 文件大?。?/td> | 5219K |
| 代理商： | ADT7476ARQZ-REEL7 |
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ADT7476
Rev. B | Page 17 of 72
VOLTAGE MEASUREMENT INPUT
The ADT7476 has four external voltage measurement channels.
It can also measure its own supply voltage, VCC. Pin 20 to Pin 23
can measure 5 V, 12 V, and 2.5 V supplies and the processor
core voltage VCCP (0 V to 3 V input). The VCC supply voltage
measurement is carried out through the VCC pin (Pin 4). The
2.5 V input can be used to monitor a chipset supply voltage in
computer systems.
ANALOG-TO-DIGITAL CONVERTER
All analog inputs are multiplexed into the on-chip, successive-
approximation, analog-to-digital converter. This has a resolution
of 10 bits. The basic input range is 0 V to 2.25 V, but the inputs
have built-in attenuators to allow measurement of 2.5 V, 3.3 V, 5
V, 12 V, and the processor core voltage VCCP without any exter-
nal components. To allow the tolerance of these supply voltages,
the ADC produces an output of 3/4 full scale (768 dec or 300
hex) for the nominal input voltage and, therefore, has adequate
headroom to deal with overvoltages.
INPUT CIRCUITRY
The internal structure for the analog inputs is shown in
Figure 24. The input circuit consists of an input protection
diode, an attenuator, and a capacitor to form a first-order low-
pass filter that gives input immunity to high frequency noise.
VCCP
17.5k
52.5k
35pF
2.5VIN
45k
94k
30pF
3.3VIN
68k
71k
30pF
5VIN
93k
47k
30pF
12VIN
120k
20k
30pF
0
53
82
-02
5
MUX
Figure 24. Structure of Analog Inputs
VOLTAGE MEASUREMENT REGISTERS
Register 0x20, 2.5 V Measurement = 0x00 default
Register 0x21, VCCP Measurement = 0x00 default
Register 0x22, VCC Measurement = 0x00 default
Register 0x23, 5 V Measurement = 0x00 default
Register 0x24, 12 V Measurement = 0x00 default
VOLTAGE LIMIT REGISTERS
Associated with each voltage measurement channel is a high
and low limit register. Exceeding the programmed high or low
limit causes the appropriate status bit to be set. Exceeding either
limit can also generate SMBALERT interrupts.
Register 0x44, 2.5 V Low Limit = 0x00 default
Register 0x45, 2.5 V High Limit = 0xFF default
Register 0x46, VCCP Low Limit = 0x00 default
Register 0x47, VCCP High Limit = 0xFF default
Register 0x48, VCC Low Limit = 0x00 default
Register 0x49, VCC High Limit = 0xFF default
Register 0x4A, 5 V Low Limit = 0x00 default
Register 0x4B, 5 V High Limit = 0xFF default
Register 0x4C, 12 V Low Limit = 0x00 default
Register 0x4D, 12 V High Limit = 0xFF default
Table 9 shows the input ranges of the analog inputs and output
codes of the 10-bit ADC.
When the ADC is running, it samples and converts a voltage
input in 0.7 ms and averages 16 conversions to reduce noise; a
measurement takes nominally 11 ms.
EXTENDED RESOLUTION REGISTERS
Voltage measurements can be made with higher accuracy using
the extended resolution registers (0x76 and 0x77). Whenever
the extended resolution registers are read, the corresponding
data in the voltage measurement registers (0x20 to 0x24) is
locked until their data is read. That is, if extended resolution is
required, the extended resolution register must be read first
immediately followed by the appropriate voltage measurement
register.
ADDITIONAL ADC FUNCTIONS FOR VOLTAGE
MEASUREMENTS
Several other functions are available on the ADT7476 to offer
the system designer increased flexibility.
Turn-Off Averaging
For each voltage/temperature measurement read from a value
register, 16 readings have been made internally and the results
averaged before being placed into the value register. When faster
conversions are needed, setting Bit 4 of Configura-tion Register 2
(0x73) turns averaging off. This effectively gives a reading that is
16 times faster, but the reading can be noisier. The default round-
robin cycle time is 146.5 ms.
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADT7476EBZEVB | 功能描述:BOARD EVALUATION FOR ADT7476 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:dBCool® 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7481 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Channel Temperature Sensor and Over Temperature Alarm |
| ADT7481ARMZ | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7481ARMZ-001 | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| ADT7481ARMZ-1 | 功能描述:IC SENSOR TEMP 2CH ALARM 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報(bào):無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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