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| 型号： | ADM1033ARQZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/35页 |
| 文件大小： | 424K |
| 描述： | IC THERM/FAN SPEED CTLR 16-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 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，外部传感器 |
| 精确度： | ±1°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 是 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
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ADM1033
http://onsemi.com
14
If the sensor is used in a very noisy environment, a
capacitor value up to 1000 pF may be placed between the D+
and D inputs to filter the noise. However, additional
parasitic capacitance on the lines between D+, D, and the
thermal diode should also be considered. The total
capacitance should never be greater than 1000 pF.
To measure each DV
BE
, the sensor is switched between
operating currents of I, (N1 ?I), and (N2 ?I). The resulting
waveform is passed through a 65 kHz low-pass filter to
remove noise, then to a chopper-stabilized amplifier that
amplifies and rectifies the waveform. This produces a dc
voltage proportional to DV
BE
. These voltage measurements
determine the temperature of the thermal diode, while
automatically compensating for any series resistance on the
D+ and/or D lines. The temperature is stored in two
registers as a 13-bit word.
To further reduce the effects of noise, digital filtering is
performed by averaging the results of 16 measurement cycles
at conversion rates of less than or equal to 8 Hz. An external
temperature measurement takes nominally 32 ms when
averaging is enabled and 6 ms when averaging is disabled.
One LSB of the ADC corresponds to 0.03125癈. The
ADM1033 can theoretically measure temperatures from
64癈 to +191.96875癈, although these are outside its
operating range. The extended temperature resolution data
format is shown in Table 9. The data for the local and remote
channels is stored in the extended temperature resolution
registers (Reg. 0x40 = Local, Reg. 0x42 = Remote 1).
Table 10. TEMPERATURE MEASUREMENT
REGISTERS
Register
Description
Default
0x40
Local Temperature, LSBs
0x00
0x41
Local Temperature, MSBs
0x00
0x42
Remote 1 Temperature, LSBs
0x00
0x43
Remote 1 Temperature, MSBs
0x00
High and low temperature limit registers are associated
with each temperature measurement channel. Exceeding the
programmed high and low limits sets the appropriate status
bit. Exceeding either limit can cause an SMBusALERT
interrupt.
Table 11. TEMPERATURE MEASUREMENT LIMIT
REGISTERS
Register
Description
Default
0x0B
Local High Limit
0x8B (75癈)
0x0C
Local Low Limit
0x54 (20癈)
0x0D
Local THERM
Limit
0x95 (85癈)
0x0E
Remote 1 High Limit
0x8B (75癈)
0x0F
Remote 1 Low Limit
0x54 (20癈)
0x10
Remote 1 THERM
Limit
0x95 (85癈)
Figure 27. ADM1033 Signal Conditioning
LOW-PASS FILTER
f
C
= 65 kHz
REMOTE
SENSING
TRANSISTOR
D+
D
V
DD
I
BIAS
I
N1 ?I
V
OUT+
V
OUT
To ADC
N2 ?I
Additional Functions
Several other temperature measurement functions
available on the ADM1033 offer the systems designer added
flexibility.
Turn-off Averaging
The ADM1033 performs averaging at conversion rates of
less than or equal to 8 conversions per second. This means
that the value in the measurement register is the average of
16 measurements. For faster measurements, set the
conversion rate to 16 conversions per second or greater.
(Averaging is not carried out at these conversion rates.)
Alternatively, switch off averaging at the slower conversion
rates by setting Bit 1 (AVG) of Configuration 1 Register
(Address 0x01).
Single-channel ADC Conversions
In normal operating mode, the ADM1033 converts on two
temperature channels: the local temperature channel, and
the remote channel. However, the user has the option to set
up the ADM1033 to convert on one channel only. To enable
single-channel mode, the user sets the round-robin bit
(Bit 7) in Configuration Register 2 (Address 0x02) to 0.
When the round-robin bit equals 1, the ADM1033 converts
on all temperature channels. In single-channel mode, it
converts on one channel only, to be determined by the state
of the channel selector bits (Bits 5 and 4) of the
Configuration Register 2 (Address 0x02).
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相关代理商/技术参数 |
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| ADM1034 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Thermal Monitor and Fan Speed (RPM) Controller |
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| ADM1034ARQ-REEL7 | 功能描述:IC THERM/FAN SPEED CTRLR 16-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADM1034ARQZ | 功能描述:IC THERM/FAN SPEED CTRLR 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
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