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| 型号： | ADT7490ARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/75页 |
| 文件大小： | 0K |
| 描述： | IC MON/FAN CTRLR REMOTE 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 56 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
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ADT7490
Additional ADC Functions for Voltage Measurements
A number of other functions are available on the
ADT7490 to offer the system designer increased flexibility.
The functions described in the following sections are
Table 11. BYPASSING INDIVIDUAL VOLTAGE INPUT
ATTENUATORS
Configuration Register 4 (0x7D)
enabled by setting the appropriate bit in Configuration
Register 2.
Configuration Register 2 (Register 0x73)
Bit 4 (AVG) = 1, Averaging Off.
Bit 5 (ATTN) = 1, Bypass Input Attenuators.
Bit No.
[4]
[5]
[6]
[7]
Channel Attenuated
Bypass +2.5 V IN Attenuator
Bypass V CCP Attenuator
Bypass +5 V IN Attenuator
Bypass +12 V IN Attenuator
Bit 6 (CONV) = 1, Single-channel Convert Mode.
Turn-off Averaging
For each voltage/temperature measurement read from a
value register, 16 readings have actually been made
internally and the results averaged before being placed into
the value register. When faster conversions are needed,
setting Bit 4 (AVG) of Configuration 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 takes 146.5 ms.
Table 10. CONVERSION TIME WITH AVERAGING
DISABLED
Single-channel ADC Conversion
While single-channel mode is intended as a test mode that
can be used to increase sampling times for a specific
channel, therefore helping to analyze that channel’s
performance in greater detail, it can also have other
applications.
Setting Bit 6 of Configuration Register 2 (0x73) places
the ADT7490 into single-channel ADC conversion mode. In
this mode, the ADT7490 can read a single voltage channel
only. The selected voltage input is read every 0.7 ms. The
appropriate ADC channel is selected by writing to Bits [7:4]
of the TACH1 minimum high byte register (0x55).
Table 12. PROGRAMMING SINGLE-CHANNEL ADC
Channel
Measurement Time (ms)
MODE
Voltage Channels
Remote Temperature 1
Remote Temperature 2
Local Temperature
0.7
7
7
1.3
Bits [7:4], Register 0x55
0000
0001
0010
Channel Selected (Note 1)
+2.5 V IN
V CCP
V CC
When Bit 7 (ExtraSlow) of Configuration Register 6
(0x10) is set, the default round-robin cycle time increases to
240 ms.
Bypass All Voltage Input Attenuators
Setting Bit 5 of Configuration Register 2 (0x73) removes
0011
0100
0101
0110
0111
+5 V IN
+12 V IN
Remote 1 Temperature
Local Temperature
Remote 2 Temperature
the attenuation circuitry from the 2.5 V IN , V CCP , V CC ,
5 V IN , and 12 V IN inputs. This allows the user to directly
connect external sensors or rescale the analog voltage
measurement inputs for other applications. The input range
of the ADC without the attenuators is 0 V to 2.25 V.
1000 V TT
1001 I MON
1. In the process of configuring single-channel ADC conversion
mode, the TACH1 minimum high byte is also changed, possibly
trading off TACH1 minimum high byte functionality with
single-channel mode functionality.
Bypass Individual Voltage Input Attenuators
Bits [7:4] of Configuration Register 4 (0x7D) can be used
to bypass individual voltage channel attenuators.
http://onsemi.com
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